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Engine smoke ford 302 marine 1990

Sent to Car Experts July 23 02:17 AM

have a 1990 Ford 302 marine engine in a boat that sat for three years unused. Previous owner had leakdown test run just before not using the boat and the results were good. Boat now smokes at startup, grey color and a little less after running awhile.

Can it be a valve guide seal since the leak down was good prior to letting the boat sit for 3 years? Or is it more likely valve guides, it is using some oil?

 

Optional Information:
1990 Ford marine 302

Customer (name blocked for privacy)
Status:  Closed   Value: $9
Answer
July 23 2:28 AM (11 minutes and 8 seconds later)
         
ACCEPTEDCheck Mark
If it's leaking down enough thru the seals then you should be able to crank it over after sitting with the plugs out and get some oil vapor/spray. Fords never really did go thru valve guides and after sitting the seals are probably hard as a rock. You cna change those from the top of the engine without taking the heads off.
1 Other Expert Agrees with this!
Sparkybuoy -- Auto Mechanic -- 93% Positive Feedback on 193 Car Accepts
20 years experience
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July 23 4:42 PM (14 hours and 13 minutes and 46 seconds later)
         
Reply to Sparkybuoy's Post: how about marvel oil or something like that that might renew the seals?
Customer (name blocked for privacy)
Answer
July 23 6:14 PM (1 hour and 31 minutes and 57 seconds later)
         
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Sparkybuoy -- Auto Mechanic -- 93% Positive Feedback on 193 Car Accepts
20 years experience
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