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F25 engine trouble
Posted: Mon Jun 17, 2013 10:23 am
by kjpf25
Put a new themostat in the '79 Chrysler 318 and while the engine runs cool now, never over 180, after approximately 40-45 minutes of running, the engine starts running rough then dies. I can get it started again but have to keep the throttle really high. Any ideas?
Re: F25 engine trouble
Posted: Mon Jun 17, 2013 2:01 pm
by Commissionpoint
Hot coil syndrome perhaps?
Re: F25 engine trouble
Posted: Mon Jun 17, 2013 5:50 pm
by larryeddington
raw water cooled t stat is 140 to 142 deg. Fresh water cool is up to 180.
Re: F25 engine trouble
Posted: Tue Jun 18, 2013 7:25 am
by kjpf25
Larry, it uses lake water. Is that "raw" or "fresh"?
Re: F25 engine trouble
Posted: Tue Jun 18, 2013 7:35 am
by kjpf25
Larry, please ignore the previous question. Did a little research and now just need to see if the boat has a heat exchanger or not. Where would it be located?
Thanks,
Kevin
Re: F25 engine trouble
Posted: Tue Jun 18, 2013 8:24 am
by Big D
When you replaced the t-stat was there water there or coolant? Coolant = fresh water cooled.
Re: F25 engine trouble
Posted: Tue Jun 18, 2013 8:28 am
by Big D
If you can keep it running at higher rpm after, it may be fuel related.
Re: F25 engine trouble
Posted: Tue Jun 18, 2013 8:44 am
by kjpf25
I talked to the mechanic that replaced it and he says it is raw water cooled he put in 160 degree thermostat.
Re: F25 engine trouble
Posted: Tue Jun 18, 2013 12:54 pm
by larryeddington
according to what I understand raw water t stat is 140 to 142 in the 318s. The reason is that at higher temps, such as 180, Salt water is much harder on a raw water cooled engine. IMO 160 will be okay for freshwater use. But others may have a different opinion I put 142s in mine as originally installed.