Service bulletin 4.3

[dontask]

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]

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]

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]

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.