I replaced and old 2QM20 with a newer 3GM30F in my 34 back in 2014. I had to "shrink" the bed rails but overall the alignment came out good and would have been more complex with a different engine. I had to disassemble parts of the 2QM to get it out.. fuel lift pump, valve cover, etc; it was a pain to haul it out. The 3GM went it much easier. Very pleased with the newer engine...smaller, lighter, quieter and with a three blade flex-o-fold prop there is plenty of "ooomph" when I need it.
I have some reference docs on my google drive that has a bunch of info about parts and design. page 9 shows the difference between a 2QM20 and 3GM30F footprint, which I used to create a mock engine and determine how to modify the bed rails. That was key to avoiding a lot of headaches. I put the new engine in once and it fit first time. https://drive.google.com/open?id=0B9BpHJkI7AfnSXZMdTFPWG90TTQ Sean Conner - LADYHAWKE Hull #134 > Message: 6 > Date: Sat, 16 Sep 2017 21:14:08 -0600 (MDT) > From: DON JONSSON <dbjons...@shaw.ca> > To: cnc-list@cnc-list.com > Subject: Stus-List Yanmar 3GMD replacement on C&C 34 > Message-ID: > <1197834892.137592424.1505618048221.javamail.zim...@shaw.ca> > Content-Type: text/plain; charset="utf-8" > > Hi > > It seems I have a leaking head gasket on my Yanmar engine. It is an old > engine but only has 2,000 hours on it. I'm going to get some quotes on fixing > it but I'm sure it won't be cheap and not sure it won't be a waste on an old > engine. > > The boat is leaking a fair bit of oil which ends up in the bilge. The best > guess when tracing the source is the gasket. Of course the leak is from an > area that is very difficult to get a good look at. The boat has also suddenly > taken to starting very poorly. Anyway those are the symptoms. > > Has any one replaced a similar engine? What with and how did it go? Any > things to watch out for? > > Thanks > Don > Victoria, BC _______________________________________________ This list is supported by the generous donations of our members. If you wish to make a contribution to offset our costs, please go to: https://www.paypal.me/stumurray All Contributions are greatly appreciated!
