Improper timing and engine temp.

[wrestling_coach]

As I read posts pertaining to high operating temps in Mercs with a closed cooling system, such as the 470 models, improper timing is never given as a possible problem. It often and rightfully so goes toward impellers, heat exchangers etc. I know we don't deal with a vacuum advance but if you don't get an older auto engine timed up correctly it will run hot. Would this hold true for the 470 line of Mercruisers?

Dennis

 

[kghost]

Yes it would!

It is important if running the original points ignition to have the poit gap (dwell) set to spec and the timing set 2 degree less than spec. I believe the timimg spec was 6 Degrees BTDC, Merc released a bulliten way back in the day to set to 4 degree BTDC due to so preignition issues and other motor failure issues with that motor.