Some years ago I ordered the non-Yanmar non-ss version of the mixing elbow with intentions to install it using the old engine fitting and coupling. I was having a new problem with the engine slowing when engaging the drive and thought some obstruction might be impacting the engine. Not wanting to spend extra time trying to separate the coupling and the exhaust fitting from the elbow I decided to order all the components from HDI. The process was quick and easy on my LF38 with a 3HM and V-drive as the exhaust is the most accessible part of the engine. Unbolting it all along with the exhaust hose from the muffler took about 10 minutes. The hose had to be cut off from the elbow which was fine as I was replacing the 2' section to the muffle anyway. The hardest part was wrestling with the new exhaust hose to mould it back to route to the muffler.
The old elbow was at least 15 seasons old but had no external leaks or rust. Examining it I would guess it to be 50% constricted for both the water and exhaust outlets. The engine side fitting only had a bit of soot inside and rusting at the coupling. The engine fitting would certainly be usable, but I have yet to try to separate the 3 parts. In the end it didn't make any difference to my engine struggling when in gear as that turned out to be the feathering prop not fully flattening to the setting. Ed Vanderkruk Prime Interest LF38 Toronto, Canada From: Jeffrey A. Laman via CnC-List <cnc-list@cnc-list.com> Sent: Sunday, July 16, 2023 7:13 PM To: Stus-List <cnc-list@cnc-list.com> Cc: Jeffrey A. Laman <jlam...@outlook.com> Subject: Stus-List C&C34 Yanmar 3GM 20hp Exhaust Elbow Hello Yanmar 3GM owners, I need to replace the U-type mixing elbow and exhaust elbow assembly on my 3GM 20hp. If this topic has been discussed here previously, my apologies -- I attempted a search of the archives but not sure I am conducting the search correctly. There seems to be debate about stainless steel vs cast iron and welded SS vs cast SS. There is a complete SS kit at https://hdimarine.net/product/gm-kit/ that appears to be high quality and reasonably priced (for a boat part...). I will be grateful for any advice on source for the exhaust elbow/mixing elbow and cast iron vs SS vs cast SS. Also, advice regarding the replacement job as I will do this myself. Thanks. Jeff Laman 1981 C&C34 Harmony Ludington, MI
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