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@…
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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
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