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Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3976
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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1970 MErcury 115 towe of power will run 15 minutes then

Customer Question

1970 MErcury 115 towe of power will run for about 15 minutes then shuts off smokes and wont start. I've replaced fuel pump diaphrams, and water pump have good compression and spark tests. help.
Submitted: 1 year ago.
Category: Boat
Expert:  Charles replied 1 year ago.

Hello, my name is***** will assist you.

Make sure that you have compression over 100 PSI on all 6 cylinders, otherwise the engine will not perform well at all. If so, When the engine stalls,do a spark test on all 6, As the engine gets hot, you could have a failing stator, or distributor.