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Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 10898
Experience:  40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
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Zero comp on no 1 cylinder any thoughts 2-3-4 all have 225

Customer Question

zero comp on no 1 cylinder any thoughts 2-3-4 all have 225 riuns great with no load put under load wont spool-up black smoke only
Submitted: 1 year ago.
Category: Boat
Expert:  Tan replied 1 year ago.
Hello Stacy. My name is***** compression in one cylinder is the reason the engine has no power. You don't have to have compression in all cylinder for the engine to run fairly decent with no load.The engine needs to have the cylinder head removed and inspected for piston failure or possible a head or valve issue. Zero compression is more likely to be a bad valve in the cylinder head. There is nothing you can do to fix this with out some disassembly. Post back with questions.

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