Re: compression for QD-17

[opposedtwin]

I dropped the lower and the impeller is fine. removed the exhaust cover and the pistons actually look pretty good. finally, I removed the head. no broken bolts thank goodness! the cylinder walls I could see looked to be in good shape. I believe I’m at the point where the previous owner turned back/gave up or whatever because the head bolts seemed to come loose pretty easy like they were not re-torqued.

so I’m left with a couple more questions.

I have to assume the motor was run hot at some point due to the discoloration around the head and block. so without any visual damage to the inside, what effect does being run hot have on an outboard? what part(s) in particular bear the brunt of having been run hot? in other words what should I continue to look for?

also, I’m going to assume the rings may be a bit snug in their lands. what can I do to coax them out short of cracking the block and mechanically loosening them up? I have heard of using sea foam in the fuel. should I try to soak the rings in the cylinder? if so, with sea foam? something else?

this motor is cosmetically very nice so I would really like to do what’s possible to get it running well. as soon as I get it started and back in one piece, i’ll post some pictures.

thanks guys!

scott