Re: mariner 75 engine problem
Sounds like the white smoke could be steam, from overheating. Hopefully they didn't run it too many times or it's quite bad for the engine.
Best thing you could do now is to try and start it; see if it's got any water flow out the telltale; and feel the exhaust manifold cover to see if it's getting hot really fast. If it is, you don't have enough (if any) cooling water flowing and shouldn't run the motor any more until you get to the bottom of the problem.
In that case, time to remove the lower unit and check/renew the pump. If the impeller is disintegrated, you'll want to check the water pipe for pieces of impeller (run some stiff wire up the pipe to check for obstructions) and perhaps check flow thru the powerhead by hooking up a source of water to the copper water supply pipe (adapt from the garden hose to the pipe).
Unless your Mariner is a Yamaha-derived motor, it has no head gasket. That back plate is just a block cover, underneath is the big water passage around the cylinders.
If you did overheat, it fried the block cover gasket, so watch out for external leakage; it didn't do the exhaust manifold gaskets any good either. If they leak to the inside, you can get water in the motor (it'll show up on the spark plugs).
If the motor overheated badly, it bodes poorly for the rings & pistons and you should have a compression check or leakdown check done before putting a lot of money into other repairs.
BTW it would help to know the serial # of your motor, that'll pin down the year and mfr.
HTH & G'luck.........ed
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cambis9
Linear Mode
