Service bulletin 4.3

dontask

Petty Officer 2nd Class
Joined
Apr 5, 2009
Messages
177
Could anyone help with locating the service bulletin on 4.3 liter Mercruiser "run on" for selecting the next lower/colder spark plug choice?
 

Bt Doctur

Supreme Mariner
Joined
Aug 29, 2004
Messages
19,093
Re: Service bulletin 4.3

Scroll down ,you`ll see my other post with a complete list.
Engine temp, engine timing, fuel , octane rating,spark plug heat range can
contribute to "dieseling at shutdown"
 

JustJason

Vice Admiral
Joined
Aug 27, 2007
Messages
5,319
Re: Service bulletin 4.3

changeing the heat range of the plug is the very last thing you want to do. 90% of dieseling is to high an idle rpm. 9.9% is everything else on the list. That last .1% is the plugs.
Have you checked through the adults only section yet?
 

dontask

Petty Officer 2nd Class
Joined
Apr 5, 2009
Messages
177
Re: Service bulletin 4.3

JustJason the rpm's are right at 650 on this pure stock engine.
Bt Doctor I found the service tip--thank you.
 
Top