Info on 165hp 250ci in line 6 cyl.

[pelican]

Originally Posted by gofastsandman

The 292 is a long stroke engine and a 250 is more square which is what I would
want in a marine application.

Snort snort Delorean used a sohc head on the PMD sprint 250 motah which had a belt driven hot cam and a quadrajet carb.

The engine gained a reputation as a good performer at 250 hp, but the belts didn't last
and many failed at under 60 k miles.

As for your engine, I would take out the plugs and fill the cylinders with kerosene and ATF.
Let it soak for a week and turn it over to get the liguid out. Then spin it with an impact driver. Change the fluids and light her off. Then do a compression test. It may be in good shape.

Many engines sit for decades and can be brought back to good health.
If this is the case, I would then pop the heads off and check the extent of corrosion
in the jackets. The valve stem seals may also be dry rotted but that is a cheap fix.

if cylinders are rusted,valves are rusted - filling it with that cocktail is going to do what ?

you are aware that cylinder and pistons have a clearance spec ? also,no surface defects should be present on either area,yes ? notice we haven't touched on the valve train quite yet ?

spin it with an impact wrench ?

pop heads off ?


perhaps a better move would be to see if it actually spins over,with the plugs out - we'll skip the impact gun for this and substitute a breaker bar instead....turn it over a few times and see what happens


"step up" is claiming the motor's free:
"The 6 that is in the boat turns but has sat for many years so a total rebuild is a must. Ty for the info "


overhaul on that motor is going to be cheap - the "hang ons are the $ exhaust manifold,carb,electrical - I would count in as all hangon parts needing replacement...



are you not the same gentleman that was attempting to rebuild a 24 topaz a few years ago ?