Posted by William A. Cormack (wacormack@…>)
Making your own out of commercial plumbing parts is OK as Al suggested but make sure that you get the grade of fitting that is rated for natural gas use. The ordinary pipe is water tight but gas can permeate.
Bill
----- Original Message -----
From: Lorman, Alvin J.
To: freedomyachts2003@yahoogroups.com
Sent: 03/24/2006 10:18 AM
Subject: RE: [freedomyachts2003] Perkins 4107/4108 exhaust mixing elbow needed
Michel:
I actually know little about these things, but on other web sites I have seen folks make exhaust elbows from readily available pipe. For example, I read how a Sabre owner put together a new exhaust elbow for a Westerbeke for very little money using commercial plumbing parts. (Here’s his description: “I put a 1 1/4” tee in the line, a 1 1/4" x 1/2" reducer, a 1/2" street 45 ° elbow, a close nipple, another 45° and a short nipple to which I connected the water hose to. Attached is the best photo I have of this connection. The original connection failed right at the weld where they cut in a wye for the hose connection. I used VersaChem High-Temp Red Silicone RTV 650 sealant that I either bought at Wal-Mart or Advanced Auto Parts. It is rated for 650° F and is oxygen sensor safe (meaning no hydrocarbons).").
Al Lorman
F30 Ab Initio
-----Original Message-----From: freedomyachts2003@yahoogroups.com [mailto:freedomyachts2003@yahoogroups.com] On Behalf Of michel.capelSent: Friday, March 24, 2006 10:00 AMTo: freedomyachts2003@yahoogroups.comSubject: [freedomyachts2003] Perkins 4107/4108 exhaust mixing elbow neededGuys (girls included),My 1981 F44 has an older (1980) Perkins 4108. My mixing elbow is completely gone. Apparently, for this engine, Perkins ony supplied the five bolt flange with 1.5" NPT threaded hole in it, not the mixing elbow itself. My 90* elbow was cast iron, from Westerbeke, and connected through a 6" length of pipe with 1.5" NPT thread on both ends. Not a good solition, I think, because the exhaust manifold is cooled, the mixing elbow is cooled, and the piece of pipe in between gets a 1000 degrees hot. It was insulated with a piece of glass cloth. I can order the Westerbeke elbow through Torresen.com (fantastic website with all these exploded views!) but it’s cast iron (corrodes quickly), heavy, and therefore costs me $100 in shipping alone. There is also a company called Foley Engines and they show several types of aluminum mixing elbows that should fit the 5-bolt flange. They don’t react on my emails, however.What is the most economical solution for a mixing elbow that I could think of?Thanks for your help.Michel Capel
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