merc 4.3 140 thermostat

[MATMAN29]

I have A 98 4.3 merc I read the service bulletin on engine dieseling & it says one of the solutions is to go to A 140 thermostat instead of the 160 however the only 140 I can find is the older model 4.3 so does anyone know if this will work or better yet does any one have a part # for a 140 to fit a 98 4.3

 

[Chris1956]

Re: merc 4.3 140 thermostat

Matman, Another way to fix the dieseling is to allow the motor to idle (and cool off) for 20 seconds or so, before shutting it off.

 

[Don S]

Re: merc 4.3 140 thermostat

Usually dieseling isn't much of a problem with the 4.3's, and I doubt a thermostat change will cure your problem.<br />Are you sure the engine is running properly? and tuned up?<br />Is the timing set correctly (Per the manual) not by ear, and depending on ignition type was it in base timing when set?<br />What is the idle rpm? To fast an idle will cause dieseling. Is the idle mixture too lean???<br />Plus like Chrix mentions, a quick shutdown after a fast run will sure cause dieseling. Allow some to to cool off before shutting off.