J/30 Class Association Forums J/30 Forum The Boat, Sails and Equipment Engine Zincs in the 2GM

I have recently purchased a J30, hull #337, and have acquired a Yanmar operation manual for the GM series. This manual covers the 2GM20, but my engine just says 2GM, and is rated for less continuous HP (13) than is listed in the manual (16). The engine is raw water cooled.

I've seen mention in these forums of changing engine zincs and have read enough horror stories about engines destroyed for this reason. Yet the operations manual doesn't say anything about zincs.

So I'm figuring that one of two things may be happening:

1. The 2GM20 in the manual is different from my 2GM, and my 2GM has zincs while the 2GM20 doesn't.

2. None of the 2GM's have zincs, but the 2QM's do, and the people talking about changing zincs on J30s have 2QM's.

So which one is it? Do I have anything more than the prop shaft zincs protecting my engine?

Thanks,

Ryan Pierce
rdpierce@pobox.com

I`m not sure what engine is in my hull 361, but there is 2 zincs.One is on the starboard side and one on the aft end of the engine block.You will see the large nuts(bolts) and these have the zincs screwed to the inside of them.The nuts(bolts) dont have any other purpose then to hold the zincs and are quit noticeable.

There are 2 zincs on the 2GM. If you email me your fax number I will photocopy the manual. j30381@(nospam)aol.com. The zinc on the back of the engine was very difficult. The zinc "holder" is held on by one large metric screw and that is part of a assembly that is held on by 4 screws. I ended up taking the assembly to a machinist to get the zinc out and grinding the hex fitting down to an SAE size. (because od all the burrs and corner rounding from my efforts to get it off)