No start when hot

as140672

Cadet
Joined
Mar 23, 2016
Messages
14
Hey guys got a 92 chris craft with a 5.0 ford, thing runs absolutely amazing (only 442 hours) but soon as I shut it off affter running for long periods of time it will just slowly turn over and not start, but soon as it cools down it fires easy and will run and idle great. It has new starter (maybe 2 weeks old) new 2 gauge cables from the battery to solenoid, new starting solenoid and also new marine battery, all parts are under 2 weeks old. Also charging system seems to be working good keeping it at 14 volts. Thank you
 

JonBrown

Seaman
Joined
Apr 4, 2016
Messages
56
Hello as,
I think a few things to check, first. Timing with a light would be advisable. Advanced it would start easy cold and seem more responsive, so I have a few customers advance the distributor causing this on 350 chevy and ford 5.0, 5.8 etc.This creates hard start or locking sound as it turns over when hot. Usually it is heat on the intake. Do you have a good airflow to the engine? Is it truly cooling as it should? If you run a closed system is the thermostat really opening all of the way? Is the system clogged? sometimes you can look into the heat exchanger.
Also when you shut it down does the carb leak fuel into the intake? You can sometimes check a holly by seeing the butterfly in the bottom of the carb is very wet. Rarely this happens. The last is to check your manifolds. , I dont believe this is your problem but my last idea. My bet is in timing and cooling efficiently .
I hope this helps.
Jon
 

as140672

Cadet
Joined
Mar 23, 2016
Messages
14
Yeah cooling seems good it stayed at like 160 when running really hard and being 80 out, could be timing, just did not think that was the issue because how smooth the motor runs. Im going to try throwing a new cable from the solenoid to the starter and put a better end on the nagitive terminal and see what happens. Issue only occurs when its in the water being ran hard, dose not give any issue when running on a hose. Starting to think the starter is "soaking" heat making the starter need more power to start. For all I know the new starter was rebuilt wrong hahaha. Thank you for your input, ill get a timing light and see what itit's at.
 

JonBrown

Seaman
Joined
Apr 4, 2016
Messages
56
You could be correct about the starter. There is a difference also between a marine and car starter. The moisture will kill a car starter and have weird symptoms. If it was rebuilt to be a car starter. I think your heat soak idea is a good theory . And being a 1992 it wouldnt hurt to change any possible wiring in the start circuit.
And out of time will not always kill the running of the engine , although it effects the efficiency and also the start when hot. Heating the pistons up (out of time) can make it vapor lock kind of.
Jon
 

HT32BSX115

Supreme Mariner
Joined
Dec 8, 2005
Messages
10,083
Hey guys got a 92 chris craft with a 5.0 ford, thing runs absolutely amazing (only 442 hours) but soon as I shut it off affter running for long periods of time it will just slowly turn over and not start, but soon as it cools down it fires easy and will run and idle great. It has new starter (maybe 2 weeks old) new 2 gauge cables from the battery to solenoid, new starting solenoid and also new marine battery, all parts are under 2 weeks old. Also charging system seems to be working good keeping it at 14 volts. Thank you

I had a similar problem with my 460. Riser gaskets were leaking a little water back into open exhaust valves causing a partial hydrolock. After 30 min or more, it would crank right over (after that little bit of water leaked past the rings.

Try pulling the plugs to crank it after a run. If water shoots out of the plug holes, you have a riser gasket leak or a cracked riser/manifold.
 

Redrig

Master Chief Petty Officer
Joined
Oct 13, 2009
Messages
860
I know you just got a new starter , but is it an older style starter ? the big and heavy kind or a newer smaller PMGR starter ?

cuz if its the older style you have , I would highly reccomend upgrading to the new style starter (marine of course)

I have done that upgrade on both my boat with a 302, and my old bronco with a 302. They both fire up like rocket ships now!

The PMGR style starters are just better in so many ways and its and easy upgrade, there is a ton of info on google about the process .

Good Luck
 

as140672

Cadet
Joined
Mar 23, 2016
Messages
14
Thanks for the info guy, greatly appreciat it, replaced and cleaned ends on the negative wire, put a new wire from the solenoid to the starter. Ill I'll have to test and see if it is getting water in it, but im really thinking it was a bad wire because of the heat that was coming off the cables, and how hot the starter was. And it is a newly rebuilt (old style/stock) marine starter. Im going to have to go bring it back out on the water, thats the only time it gives me issues
 
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