Here I go being contrary again...
In my mind the 3qm30F is overall a better engine then the 3gm
. Its heavier, lower reving. Very forgiving. Yes parts will be an issue. But a new rebuild
of a 3qm should give lots more miles then a 3gm30f which is lighter construction and higher reving.
If you have all the parts with new rings, bearings, etc. then go ahead and rebuild the 3QM30. Putting an 3gm or 3qm together is a matter of a few days, once all the machining is done. Then cleaning
the block (soap and water), coating the cylinders with oil
to prevent rust and then do some zen mediation as you assemble it. Its pretty easy to build. I hear even some blondes chicks can build them.
Watch out for the special tools you'll need. I found that a small metal oil filter
wrench makes a dandy ring compressor
Me I would put it together in the cockpit
of the boat as the weight of the finished engine will be a wee bit. Use 2x8's laid across the cockpit
with drop cloth under engine. You can use the boom with the main halyard
connected with rope
and shackels around the hoist point on the boom. The halyard
carries the weight. Then use a comealong to raise the engine and a boomvang to pull it into the cabin
. Getting the engine bed
situated will take some time of course.
Parts for the 3qm tend to be pricy. Though some of the parts for the 3gm sting a bit too.