J/30 Class Association Forums J/30 Forum The Boat, Sails and Equipment Yanmar 2GM Rebuild for Rhapsody

Here's a tip for anyone who has excessive engine / shaft motion and shaft seal leakage. I replaced the engine mounts in 2007 with PYI Engine Mounts #800040 (5/8" stud - 4" hole pattern, rated for 30 - 91 lbs. Long story short, these mounts did not have sufficient load capacity and resulted in some spray off the dripless shaft seal at higher RPMs due to excessive shaft movement with engine vibration.

The combined 2GM engine / transmission weight is approximately 275 lbs. I assumed equal load distribution, and subsequently learned the distribution is approximately 40% forward, 60% aft. Early this season I replaced the aft mounts with Bushings Inc. DF-2205-2 and noticed significantly reduced engine motion and resulting spray. The front of the engine still showed lots of motion at idle.

Well the straw that broke the camels back was returning through the Cape Cod Canal from the NAs. I limited RPM to minimize the inconvenience of cleaning up the spray from the shaft seal in the engine compartment, when I really could have used max RPM to power through the chop in the canal.

Upon return I ordered two more Bushings Inc. DF-2205-2 mounts and replaced the front mounts last night. The engine now has very little motion at idle, but I don't notice any more deck vibration than previously. The new mounts are rated for engine weights 150 to 450 lbs. I'll do a high speed run this weekend to verify all shaft seal leakage has been eliminated due to vibration.

So - if you replace your 2GM engine mounts, the ones that work for me are Bushings Inc. DF-2205-2. I also used aluminum plate and built shims under the mounts so the adjustment nuts are near the bottom of the stud. I figure this reduces the stress applied to the mount. Pictures of the two mounts are shown below.

DF-2205-2 Engine Mount. . . PYI #800040 Engine Mount

.