smokie 302

[richale]

Ive got twin 302s. The port side smokes to much and I thought someone had an idea of maybe an additive or something that could reduce that. Last spring I redid the head and put new raw water intakes on it. The compression test was fine,also put new rocker arm assembly on it. as well. My neighbors would appreciate a fix as well as the people in every port ..Any help? Oh, it will burn about 1/2 to 3/4 of a quart of oil every 8 hrs running at 8 knots.

 

[HT32BSX115]

Re: smokie 302

Howdy,

You redid "A" head? Only one? does it only smoke at low rpms, medium or at WOT?

If it only does it at low and medium throttle settings it's possible that it's valve seals/guides on the either the head you rebuilt, or the one you didn't.
Does it have thru hull exhaust? (Left or right bank...that's one way to check.)

It's also possible that the valve stem seals were left out....( I can't imagine a machine shop would leave out the seals ...but it has happened!!)

At low throttle you have high intake vacuum. If the valve stem seals were either missing or your valve guides were real loose it would suck oil down thru the guides. At WOT there's a LOT less vacuum so it doesn't suck as much oil in there.....

If it's at all RPMs then it's possibly rings. The only additives that will eliminate oil smoke are new parts in a rebuilt engine. Is the crankcase breather plugged? You could be pressurizing the crankcase.

"Snake Oil" additives only add money to the retailer that sells them.

Looks like an engine rebuild may be required.


Regards,



Rick

 

[Bondo]

Re: smokie 302

The compression test was fine,

Ayuh,........... Define "Fine"....... What are the #s...........

 

[Don S]

Re: smokie 302

I think a leakdown test is in order.
Has the engine ever had water in it? Engine froze up so it wouldn't turn over, then freed up? The rust will kill the rings and cylinders.

 

[a70eliminator]

Re: smokie 302

Make sure the oil returns in the head aren't restricted with sludge or debris like one of those cardboard or paper lid seals you see beneath the cap of a new quart of oil, there's no guide seal that's going to hold back an oil flooded head. Although it's a longshot I just thought it would be worth a mention.