Posted by odl_nyc (odl_nyc@…>)
I have a yanmar 27hp engine, on a F36, it can run all day at 2500 rpm,
but if I increase rpm to 2,800 it quickly starts to overheat. I was
told that maybe my heat exchanger is clogged and needs
cleaning/repair. anyone have a similar problem. Is the repair or
changing of the heat exchanger very difficult.
thanks
Posted by Lorman, Alvin J. (ajlorman@…>)
Check this site: http://www.boatfix.com/how/cooling2.html
-----Original Message-----From: freedomyachts2003@yahoogroups.com [mailto:freedomyachts2003@yahoogroups.com] On Behalf Of odl_nycSent: Tuesday, October 18, 2005 3:41 PMTo: freedomyachts2003@yahoogroups.comSubject: [freedomyachts2003] OverheatingI have a yanmar 27hp engine, on a F36, it can run all day at 2500 rpm,but if I increase rpm to 2,800 it quickly starts to overheat. I wastold that maybe my heat exchanger is clogged and needscleaning/repair. anyone have a similar problem. Is the repair orchanging of the heat exchanger very difficult. thanks
=00IRS CIRCULAR 230 NOTICE. Any advice expressed above as to tax matters was neither written nor intended by the sender or Mayer, Brown, Rowe Maw LLP to be used and cannot be used by any taxpayer for the purpose of avoiding tax penalties that may be imposed under U.S. tax law. If any person uses or refers to any such tax advice in promoting, marketing or recommending a partnership or other entity, investment plan or arrangement to any taxpayer, then (i) the advice was written to support the promotion or marketing (by a person other than Mayer, Brown, Rowe Maw LLP) of that transaction or matter, and (ii) such taxpayer should seek advice based on the taxpayers particular circumstances from an independent tax advisorThis email and any files transmitted with it are intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. If you are not the named addressee you should not disseminate, distribute or copy this e-mail.
Posted by lance_ryley (lance_ryley@…>)
Over the winter I had my heat exchanger rebuilt on a perkins 4.108
because the zinc pencil had corroded so badly that it broke off
inside. Since I needed to take it off to remove the debris, I
figured I’d have it professionally cleaned as well. I uninstalled it
an reinstalled it myself, and the only issue was that next time,
I’ll remove the oil filter first, as it makes things a bit difficult.
when I first refilled the engine with coolant, I had the same issue
where it could run all day at a certain speed, but as soon as I
throttled up, it started to overheat.
What I didn’t realize was that when I first put the new coolant in,
the system needed to ‘burp,’ and then I needed to add more coolant.
So definitely make sure your coolant levels are right, that you
don’t have a stuck thermostat, and that your heat exchanger isn’t
plugged up with crud. For that matter, check your raw water intake
as well to make sure it’s circulating properly.
just a few ideas.
Lance
— In freedomyachts2003@yahoogroups.com, “odl_nyc” <odl_nyc@y…>
wrote:
I have a yanmar 27hp engine, on a F36, it can run all day at 2500
rpm,
but if I increase rpm to 2,800 it quickly starts to overheat. I was
told that maybe my heat exchanger is clogged and needs
cleaning/repair. anyone have a similar problem. Is the repair or
changing of the heat exchanger very difficult.thanks
Posted by Payne, Doug (doug.payne@…>)
A F 32 I charter in CA with the same Yanmar does the same thing. My F28 with a 18HP Yanmar did it when I bought the boat. Had the heat exchanger cleaned, no more overheat. However, it is now doing it again. Had a mechanic out, he looked at the heat exchanger, it was clear, we found some bark chips stuck on the inside of the thru hull, cleaned those out, changed the coolant, burped, checked the thermostat, good water out the stern pipe, ran fine under load at the dock up to 3200 RPM, etc. However, now it still overheats at about 2800 and up. So, I am very interested in this post. Have heard may need to do a leak down test, a pretty complicated procedure according to Yanmar that needs special adapters and instruments to perform the test. The local Yanmar guy in AZ doesn’t have the equipment.
Douglas M. Payne
Managing Partner Arizona Colorado
Tatum Partners
480-614-4915 Office
480-236-4561 Mobile
480-614-4916 Fax
doug.payne@…
TATUM PARTNERS
Financial and Information Technology Leadership
Tatum CFO Partners, LLP - Tatum CIO Partners, LLP www.tatumpartners.com
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From: freedomyachts2003@yahoogroups.com [mailto:freedomyachts2003@yahoogroups.com] On Behalf Of Lorman, Alvin J.Sent: Tuesday, October 18, 2005 2:05 PMTo: freedomyachts2003@yahoogroups.comSubject: RE: [freedomyachts2003] Overheating
Check this site: http://www.boatfix.com/how/cooling2.html
-----Original Message-----From: freedomyachts2003@yahoogroups.com [mailto:freedomyachts2003@yahoogroups.com] On Behalf Of odl_nycSent: Tuesday, October 18, 2005 3:41 PMTo: freedomyachts2003@yahoogroups.comSubject: [freedomyachts2003] OverheatingI have a yanmar 27hp engine, on a F36, it can run all day at 2500 rpm,but if I increase rpm to 2,800 it quickly starts to overheat. I wastold that maybe my heat exchanger is clogged and needscleaning/repair. anyone have a similar problem. Is the repair orchanging of the heat exchanger very difficult. thanks=00
IRS CIRCULAR 230 NOTICE. Any advice expressed above as to tax matters was neither written nor intended by the sender or Mayer, Brown, Rowe & Maw LLP to be used and cannot be used by any taxpayer for the purpose of avoiding tax penalties that may be imposed under U.S. tax law. If any person uses or refers to any such tax advice in promoting, marketing or recommending a partnership or other entity, investment plan or arrangement to any taxpayer, then (i) the advice was written to support the promotion or marketing (by a person other than Mayer, Brown, Rowe & Maw LLP) of that transaction or matter, and (ii) such taxpayer should seek advice based on the taxpayers particular circumstances from an independent tax advisor
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Posted by Jerome Weinraub (zayde@…>)
Yanmar is easy.Buy two books-the 3gm series shop manual,and the parts
manual. I did for the same reasons,using these 2 books so I knew what to
do,and what parts I needed. It was a piece of cake.Use Neversieze on all
fastenings when re assembling. Also,if your exhaust elbow is used in salt
water,and is over 5 yrs old,it might be the culprit. Also,(IMPORTANT),check
that your intake hose from the thru-hull isnt soft and collapsing under the
vacuum . .You should have a healthy amount of exhaust water. Flush and drain
the fresh water system with clear water at least twice and replace the
antifreeze with Yanmar or Caterpillar diesel specific antifreeze. It is
,among other things,a better heat transfer agent,
Original Message -----
From: “odl_nyc” <odl_nyc@…>
To: <freedomyachts2003@yahoogroups.com>
Sent: Tuesday, October 18, 2005 3:41 PM
Subject: [freedomyachts2003] Overheating
\
I have a yanmar 27hp engine, on a F36, it can run all day at 2500 rpm,
but if I increase rpm to 2,800 it quickly starts to overheat. I was
told that maybe my heat exchanger is clogged and needs
cleaning/repair. anyone have a similar problem. Is the repair or
changing of the heat exchanger very difficult.thanks
Yahoo! Groups Links
Posted by macks011 (macks04@…>)
I have a F36 with the Yanmar 3gm30F.That engine wants to cruise at
2800 to 3000 rpm with the Kanzaki 2.62 : 1 gear ratio. You should be
propped to give you at least 3400 RPM in gear w/o black smoke. You
should be making 6.5kn at 2900 RPM with that gear ratio.
Regarding the overheating. Run the engine up to temp and put your
hand on the flat metal cap on top of the mixing elbow. If it is warm
or hot, your mixing elbow is clogged and needs to be replaced. I do
it as matter of routine maintenance every 4 years. $90.00+/- in
parts.
If the mixing elbow is cool, check the flow of your raw water pump.
make sure you have significant flow out the exhaust. When’s the last
time you changed the impeller? I do it every season as routine
maintenance. Check the raw water screen and thru hull for blockage.
If the mixing elbow is cool and you have sufficient water flow,
check the thermostat. Put it in a pot of water at 170*. It should
open. If not, replace it. If you have no maintenence records of when
it was replaced last, replace it any way.
Check the Heat exchange filler cap. When it gets old, it loses its
sealing ability and the ability to hold pressure and operate the
expansion tank.
Lastly, look at the heat exchanger itself. Its a moderate sized job
and you would do well to eliminate all the other possibilities
first. A buddy of mine went to the heat exchanger on a Yanmar 2 gm f
first. Did $700 dollars damage to the core and only after found out
he had a bad impeller.
— In freedomyachts2003@yahoogroups.com, “odl_nyc” <odl_nyc@y…>
wrote:
I have a yanmar 27hp engine, on a F36, it can run all day at 2500
rpm,
but if I increase rpm to 2,800 it quickly starts to overheat. I was
told that maybe my heat exchanger is clogged and needs
cleaning/repair. anyone have a similar problem. Is the repair or
changing of the heat exchanger very difficult.thanks
Posted by Brian Guptil (sailordude@…>)
Sounds good,
only I would suggest that the no smoke RPM for the 3gm30f
is 3600. If it smokes below that rpm the prop is overpitched or there is
another problem.
Brian
-----Original Message-----
From: freedomyachts2003@yahoogroups.com [mailto:freedomyachts2003@yahoogroups.com] On Behalf Of macks011
Sent: Tuesday, October 18,
2005 6:40 PM
To: freedomyachts2003@yahoogroups.com
Subject: [freedomyachts2003] Re:
Overheating
I have a F36 with the Yanmar 3gm30F.That engine wants
to cruise at
2800 to 3000 rpm with the Kanzaki 2.62 : 1 gear
ratio. You should be
propped to give you at least 3400 RPM in gear w/o
black smoke. You
should be making 6.5kn at 2900 RPM with that gear
ratio.
Regarding the overheating. Run the engine up to
temp and put your
hand on the flat metal cap on top of the mixing
elbow. If it is warm
or hot, your mixing elbow is clogged and needs to
be replaced. I do
it as matter of routine maintenance every 4 years.
$90.00+/- in
parts.
If the mixing elbow is cool, check the flow of
your raw water pump.
make sure you have significant flow out the
exhaust. When’s the last
time you changed the impeller? I do it every
season as routine
maintenance. Check the raw water screen and
thru hull for blockage.
If the mixing elbow is cool and you have
sufficient water flow,
check the thermostat. Put it in a pot of water at
170*. It should
open. If not, replace it. If you have no
maintenence records of when
it was replaced last, replace it any way.
Check the Heat exchange filler cap. When it gets
old, it loses its
sealing ability and the ability to hold pressure
and operate the
expansion tank.
Lastly, look at the heat exchanger itself. Its a
moderate sized job
and you would do well to eliminate all the other
possibilities
first. A buddy of mine went to the heat exchanger
on a Yanmar 2 gm f
first. Did $700 dollars damage to the core and
only after found out
he had a bad impeller.
— In freedomyachts2003@yahoogroups.com,
“odl_nyc” <odl_nyc@y…>
wrote:
I have a yanmar 27hp engine, on a F36, it can
run all day at 2500
rpm,
but if I increase rpm to 2,800 it quickly
starts to overheat. I was
told that maybe my heat exchanger is clogged
and needs
cleaning/repair. anyone have a similar
problem. Is the repair or
changing of the heat exchanger very
difficult.thanks
\
Posted by Paul McFadden (pwhitmac@…>)
If you’re getting good water flow out your exhaust underway, I would suspect the prop is probably “over pitched”. This is a fairly common problem, as the prop guys figures don’t always work out. What diameter is your prop?
PWModl_nyc <odl_nyc@…> wrote:
I have a yanmar 27hp engine, on a F36, it can run all day at 2500 rpm,but if I increase rpm to 2,800 it quickly starts to overheat. I wastold that maybe my heat exchanger is clogged and needscleaning/repair. anyone have a similar problem. Is the repair orchanging of the heat exchanger very difficult. thanks
Yahoo! Music Unlimited - Access over 1 million songs. Try it free.
Posted by Sward (swardfullsail@…>)
What should the diameter and pitch of the prop be for the Max Prop for the 32’s. I was told mine could be adjusted next time the boat was out of the water as I can’t get the boat RPM’s over 28000. The yard that worked on it didn’t seem to know much about them, but did have a book that they were following.
SwardPaul McFadden <pwhitmac@…> wrote:
If you’re getting good water flow out your exhaust underway, I would suspect the prop is probably “over pitched”. This is a fairly common problem, as the prop guys figures don’t always work out. What diameter is your prop?
PWModl_nyc <odl_nyc@…> wrote:
I have a yanmar 27hp engine, on a F36, it can run all day at 2500 rpm,but if I increase rpm to 2,800 it quickly starts to overheat. I wastold that maybe my heat exchanger is clogged and needscleaning/repair. anyone have a similar problem. Is the repair orchanging of the heat exchanger very difficult. thanks
Yahoo! Music Unlimited - Access over 1 million songs. Try it free.
Posted by macks011 (macks04@…>)
Sounds like you are overpropped by approximately 800RPM (Yanmar
2GM20F, 3GM30F). That equates to 200 RPM for each inch of pitch or
inch of dia. Max Prop gives their pitch settings in “degrees”. From
their chart, 6 degrees of pitch decrease = 3.8" of pitch decrease =
760 RPM. These numbers are not exact and the chart varies somewhat
depending what prop dia. you are using. You might consider
decreasing your pitch by 4 degrees when you splash next season and
fine tuning it after that. If you post your current prop dia and
setting, I can give you the numbers off the chart.
— In freedomyachts2003@yahoogroups.com, Sward <swardfullsail@y…>
wrote:
What should the diameter and pitch of the prop be for the Max Prop
for the 32’s. I was told mine could be adjusted next time the boat
was out of the water as I can’t get the boat RPM’s over 28000. The
yard that worked on it didn’t seem to know much about them, but
did have a book that they were following.Sward
Paul McFadden <pwhitmac@y…> wrote:
If you’re getting good water flow out your exhaust underway, I
would suspect the prop is probably “over pitched”. This is a fairly
common problem, as the prop guys figures don’t always work out. What
diameter is your prop?
PWModl_nyc <odl_nyc@y…> wrote:
I have a yanmar 27hp engine, on a F36, it can run all day at 2500
rpm,
but if I increase rpm to 2,800 it quickly starts to overheat. I was
told that maybe my heat exchanger is clogged and needs
cleaning/repair. anyone have a similar problem. Is the repair or
changing of the heat exchanger very difficult.thanks
Yahoo! Music Unlimited - Access over 1 million songs. Try it free.
YAHOO! GROUPS LINKS
Visit your group "freedomyachts2003" on the web. To unsubscribe from this group, send an email to:freedomyachts2003-unsubscribe@yahoogroups.com
Your use of Yahoo! Groups is subject to the Yahoo! Terms of
Service.
Posted by Sward (swardfullsail@…>)
Hi,
I have a 14"/3 blade Max Prop with a 24 degree blade setting anglemacks011 <macks04@…> wrote:
Sounds like you are overpropped by approximately 800RPM (Yanmar 2GM20F, 3GM30F). That equates to 200 RPM for each inch of pitch or inch of dia. Max Prop gives their pitch settings in “degrees”. From their chart, 6 degrees of pitch decrease = 3.8" of pitch decrease = 760 RPM. These numbers are not exact and the chart varies somewhat depending what prop dia. you are using. You might consider decreasing your pitch by 4 degrees when you splash next season and fine tuning it after that. If you post your current prop dia and setting, I can give you the numbers off the chart.— In freedomyachts2003@yahoogroups.com, Sward <swardfullsail@y…> wrote:>> What should the diameter and pitch of the prop be for the Max Prop for the 32’s. I was told mine could be adjusted next time the boat was out of the water
as I can’t get the boat RPM’s over 28000. The yard that worked on it didn’t seem to know much about them, but did have a book that they were following.> > Sward> > Paul McFadden <pwhitmac@y…> wrote:> If you’re getting good water flow out your exhaust underway, I would suspect the prop is probably “over pitched”. This is a fairly common problem, as the prop guys figures don’t always work out. What diameter is your prop?> PWM> > odl_nyc <odl_nyc@y…> wrote:> I have a yanmar 27hp engine, on a F36, it can run all day at 2500 rpm,> but if I increase rpm to 2,800 it quickly starts to overheat. I was> told that maybe my heat exchanger is clogged and needs> cleaning/repair. anyone have a similar problem. Is the repair or> changing of the heat exchanger very difficult. > > thanks> > > >
---------------------------------> Yahoo! Music Unlimited - Access over 1 million songs. Try it free. > > ---------------------------------> YAHOO! GROUPS LINKS > > > Visit your group “freedomyachts2003” on the web.> > To unsubscribe from this group, send an email to:> freedomyachts2003-unsubscribe@yahoogroups.com> > Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. > > > --------------------------------->
Posted by Paul McFadden (pwhitmac@…>)
I’m running my spare prop at the present. When I purchased the boat I had the same overpitch problem. Had it re-pitched, so now it is a “square” 14X14. the prop is a 3blade Michigan, and gives me full rpm at this pitch, tho I generally cruise @ 25-2700rpm, which gives me approx .5 gph.
PWMSward <swardfullsail@…> wrote:
What should the diameter and pitch of the prop be for the Max Prop for the 32’s. I was told mine could be adjusted next time the boat was out of the water as I can’t get the boat RPM’s over 28000. The yard that worked on it didn’t seem to know much about them, but did have a book that they were following.
SwardPaul McFadden <pwhitmac@…> wrote:
If you’re getting good water flow out your exhaust underway, I would suspect the prop is probably “over pitched”. This is a fairly common problem, as the prop guys figures don’t always work out. What diameter is your prop?
PWModl_nyc <odl_nyc@…> wrote:
I have a yanmar 27hp engine, on a F36, it can run all day at 2500 rpm,but if I increase rpm to 2,800 it quickly starts to overheat. I wastold that maybe my heat exchanger is clogged and needscleaning/repair. anyone have a similar problem. Is the repair orchanging of the heat exchanger very difficult. thanks
Yahoo! Music Unlimited - Access over 1 million songs. Try it free.
Yahoo! Music Unlimited - Access over 1 million songs. Try it free.
Posted by macks011 (macks04@…>)
14" 3 blade: 24* = 11.8" pitch
22* = 10.7" pitch
20* = 9.6" pitch
18* = 8.6" pitch
16* = 7.6" pitch
There is a corresponding chart which gives the gear settings to
obtain the pitch numbers. If you don’t have the manual, you can
probably download it from PYI, or give me a fax # and I’ll send you
a copy.
— In freedomyachts2003@yahoogroups.com, Sward <swardfullsail@y…>
wrote:
Hi,
I have a 14"/3 blade Max Prop with a 24 degree blade setting angle
macks011 <macks04@o…> wrote:
Sounds like you are overpropped by approximately 800RPM (Yanmar
2GM20F, 3GM30F). That equates to 200 RPM for each inch of pitch or
inch of dia. Max Prop gives their pitch settings in “degrees”.
From
their chart, 6 degrees of pitch decrease = 3.8" of pitch decrease
=
760 RPM. These numbers are not exact and the chart varies somewhat
depending what prop dia. you are using. You might consider
decreasing your pitch by 4 degrees when you splash next season and
fine tuning it after that. If you post your current prop dia and
setting, I can give you the numbers off the chart.— In freedomyachts2003@yahoogroups.com, Sward
<swardfullsail@y…>
wrote:What should the diameter and pitch of the prop be for the Max
Prop
for the 32’s. I was told mine could be adjusted next time the
boat
was out of the water as I can’t get the boat RPM’s over 28000.
The
yard that worked on it didn’t seem to know much about them, but
did have a book that they were following.Sward
Paul McFadden <pwhitmac@y…> wrote:
If you’re getting good water flow out your exhaust underway, I
would suspect the prop is probably “over pitched”. This is a
fairly
common problem, as the prop guys figures don’t always work out.
What
diameter is your prop?
PWModl_nyc <odl_nyc@y…> wrote:
I have a yanmar 27hp engine, on a F36, it can run all day at
2500
rpm,
but if I increase rpm to 2,800 it quickly starts to overheat. I
was
told that maybe my heat exchanger is clogged and needs
cleaning/repair. anyone have a similar problem. Is the repair or
changing of the heat exchanger very difficult.thanks
Yahoo! Music Unlimited - Access over 1 million songs. Try it
free.
YAHOO! GROUPS LINKS
Visit your group "freedomyachts2003" on the web. To unsubscribe from this group, send an email to:freedomyachts2003-unsubscribe@yahoogroups.com
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Posted by Sward (swardfullsail@…>)
I do have the manual for the Max Prop and see these numbers, but how do I know what the “engine and reduction ratios” are? Is that in the Yanmar Manual?macks011 <macks04@…> wrote:
14" 3 blade: 24* = 11.8" pitch 22* = 10.7" pitch 20* = 9.6" pitch 18* = 8.6" pitch 16* = 7.6" pitchThere is a corresponding chart which gives the gear settings to obtain the pitch numbers. If you don’t have the manual, you can probably download it from PYI, or give me a fax # and I’ll send you a copy.— In freedomyachts2003@yahoogroups.com, Sward <swardfullsail@y…> wrote:>> Hi,> > I have a 14"/3 blade Max Prop with a 24 degree blade setting angle> > macks011
<macks04@o…> wrote:> Sounds like you are overpropped by approximately 800RPM (Yanmar > 2GM20F, 3GM30F). That equates to 200 RPM for each inch of pitch or > inch of dia. Max Prop gives their pitch settings in “degrees”. From > their chart, 6 degrees of pitch decrease = 3.8" of pitch decrease = > 760 RPM. These numbers are not exact and the chart varies somewhat > depending what prop dia. you are using. You might consider > decreasing your pitch by 4 degrees when you splash next season and > fine tuning it after that. If you post your current prop dia and > setting, I can give you the numbers off the chart.> > > > — In freedomyachts2003@yahoogroups.com, Sward <swardfullsail@y…> > wrote:> >> > What should the diameter and pitch of the prop be for the Max Prop > for the 32’s. I was told mine could be adjusted next time the
boat > was out of the water as I can’t get the boat RPM’s over 28000. The > yard that worked on it didn’t seem to know much about them, but > did have a book that they were following.> > > > Sward> > > > Paul McFadden <pwhitmac@y…> wrote:> > If you’re getting good water flow out your exhaust underway, I > would suspect the prop is probably “over pitched”. This is a fairly > common problem, as the prop guys figures don’t always work out. What > diameter is your prop?> > PWM> > > > odl_nyc <odl_nyc@y…> wrote:> > I have a yanmar 27hp engine, on a F36, it can run all day at 2500 > rpm,> > but if I increase rpm to 2,800 it quickly starts to overheat. I was> > told that maybe my heat exchanger is clogged and needs> > cleaning/repair. anyone have a
similar problem. Is the repair or> > changing of the heat exchanger very difficult. > > > > thanks> > > > > > > > > > > > > > ---------------------------------> > Yahoo! Music Unlimited - Access over 1 million songs. Try it free. > > > > ---------------------------------> > YAHOO! GROUPS LINKS > > > > > > Visit your group “freedomyachts2003” on the web.> > > > To unsubscribe from this group, send an email to:> > freedomyachts2003-unsubscribe@yahoogroups.com> > > > Your use of Yahoo! Groups is subject to the Yahoo! Terms of > Service. > > > > > > ---------------------------------> >> > > >
SPONSORED LINKS > Sailing schools Sailing instruction Sailing lesson Sailing course Sailing adventure Sailing > > ---------------------------------> YAHOO! GROUPS LINKS > > > Visit your group “freedomyachts2003” on the web.> > To unsubscribe from this group, send an email to:> freedomyachts2003-unsubscribe@yahoogroups.com> > Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. > > > --------------------------------->
Posted by macks011 (macks04@…>)
The engine model # is on a plate on the front of the engine. The
transmission mfg. and ratio are on a plate on the side of the
transmission. The info may also be in the manual if you have one
thats engine specific.
— In freedomyachts2003@yahoogroups.com, Sward <swardfullsail@y…>
wrote:
I do have the manual for the Max Prop and see these numbers, but
how do I know what the “engine and reduction ratios” are? Is that
in the Yanmar Manual?macks011 <macks04@o…> wrote:14" 3 blade: 24* = 11.8" pitch
22* = 10.7" pitch
20* = 9.6" pitch
18* = 8.6" pitch
16* = 7.6" pitchThere is a corresponding chart which gives the gear settings to
obtain the pitch numbers. If you don’t have the manual, you can
probably download it from PYI, or give me a fax # and I’ll send
you
a copy.— In freedomyachts2003@yahoogroups.com, Sward
<swardfullsail@y…>
wrote:Hi,
I have a 14"/3 blade Max Prop with a 24 degree blade setting
anglemacks011 <macks04@o…> wrote:
Sounds like you are overpropped by approximately 800RPM (Yanmar
2GM20F, 3GM30F). That equates to 200 RPM for each inch of pitch
or
inch of dia. Max Prop gives their pitch settings in “degrees”.
From
their chart, 6 degrees of pitch decrease = 3.8" of pitch
decrease
=
760 RPM. These numbers are not exact and the chart varies
somewhat
depending what prop dia. you are using. You might consider
decreasing your pitch by 4 degrees when you splash next season
and
fine tuning it after that. If you post your current prop dia and
setting, I can give you the numbers off the chart.— In freedomyachts2003@yahoogroups.com, Sward
<swardfullsail@y…>
wrote:What should the diameter and pitch of the prop be for the Max
Prop
for the 32’s. I was told mine could be adjusted next time the
boat
was out of the water as I can’t get the boat RPM’s over 28000.
The
yard that worked on it didn’t seem to know much about them,
but
did have a book that they were following.Sward
Paul McFadden <pwhitmac@y…> wrote:
If you’re getting good water flow out your exhaust underway, I
would suspect the prop is probably “over pitched”. This is a
fairly
common problem, as the prop guys figures don’t always work out.
What
diameter is your prop?
PWModl_nyc <odl_nyc@y…> wrote:
I have a yanmar 27hp engine, on a F36, it can run all day at
2500
rpm,
but if I increase rpm to 2,800 it quickly starts to overheat.
I
was
told that maybe my heat exchanger is clogged and needs
cleaning/repair. anyone have a similar problem. Is the repair
or
changing of the heat exchanger very difficult.thanks
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