500 efi over heating.driveing me nutz!!
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500 efi over heating.driveing me nutz!!
500 efi only over heats 1/2 up the canal from a day of boating. The port mot. did this a bit ago and I checked everything and even rep. the raw water pump housing and imp. rep. the thermostate and flushed everything. Still did it. so I changed the cerc. pump and that fixed it. Now the star. mot. doing the same thing. So I went through every thing and changed the cerc. pump and still doing the same thing..
It will go from 150 to 200 deg. and drop back to 150 deg then go back to 190 deg and drop. If I rase the rpms it drops faster. Checked for air leeks on the suc. sid of the raw water pump .everything looks good W.T.F. over!!!!!!!!!!!
It will go from 150 to 200 deg. and drop back to 150 deg then go back to 190 deg and drop. If I rase the rpms it drops faster. Checked for air leeks on the suc. sid of the raw water pump .everything looks good W.T.F. over!!!!!!!!!!!
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Done everything you can think of been boating in the gulf for years .
Ran out to the bay and the temp would go from 150 to 195 deg back and forth .at idle Ran 25 miles to the isands and on the way back we ran in to a fountain and ran the **** out of it. never over heated again.
Ran out to the bay and the temp would go from 150 to 195 deg back and forth .at idle Ran 25 miles to the isands and on the way back we ran in to a fountain and ran the **** out of it. never over heated again.
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Done everything you can think of been boating in the gulf for years .
Ran out to the bay and the temp would go from 150 to 195 deg back and forth .at idle Ran 25 miles to the isands and on the way back we ran in to a fountain and ran the **** out of it. never over heated again.
Ran out to the bay and the temp would go from 150 to 195 deg back and forth .at idle Ran 25 miles to the isands and on the way back we ran in to a fountain and ran the **** out of it. never over heated again.
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Im as good as anyone. But this one just was ****ed up.
I had Teeter and Big john with me and thay never seen anything like it.
I had Teeter and Big john with me and thay never seen anything like it.
Last edited by Velocity Tom; 04-26-2009 at 10:51 AM.
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I second this notion!
Do not just rely on the fact you back flushed it!
Mine had this problem several times, any running under 3500 was just fine.
Last winter I took every hose/part of the cooling system
Found major pluggage in the oil cooler holes!
Only have 5 open holes.
Took many hours and about a dozen wire coat hangers to push and prod all of the pebbles and debris out.
But low and behold it was worth it!
Saved over $500 in a pair of replacement coolers and now runs the temps it should all the way up the ROM levels
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My isue was at idle ret. from running the boat only.
I just got back from running it and it is fine. the eng. with the isue is now 10deg cooler than before.
Maby I sucked up something and blew it out running back yesterday.
I just got back from running it and it is fine. the eng. with the isue is now 10deg cooler than before.
Maby I sucked up something and blew it out running back yesterday.