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Tech Tip #3

Engine Assembly for Mercury V6 Engines

New Page 1
Check latest Mercury Service Bulletins.
Install .0002" larger jets in carburetors.
Max timing should be retarded 2 degrees.
Remove advance box if installed.
Remove idle stabilizer if installed.
Rebuild carburetors and fuel pump.
Retorque heads to 40 ft/lbs.
After 1 hour running, allow engine to cool and recheck torque. Retorque to factory specs if necessary.
OBR suggests removing oil injection system.
If oil injection is used, replace 2 PSI oil valve and check oil pump bushing and seal.
Clean and refill oil tanks with TCW-3 oil.
Verify oil comsumption during break-in by marking the oil tank level.
Check overheat alarm system and horn.
On 2.5 EFI engines, fuel pressure should be 39 lbs. minimum.
2.5 EFI engines may have as many as 7 fuel filters, remove the cone shaped filter inline below the electric pump.
Use newest style head gaskets and replace every year to prevent failure.
Replace water pump impeller and gasket every year to prevent head gasket failure.
Use 92-94 octane premium fuel.


Carefully following these instructions will aid in the proper assembly & break-in of your Mercury V6 engine


If you have any questions or comments, let us know!

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7851 Crary Station Road
Semmes, AL. 36575