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cgarmon
06-30-2006, 03:51 PM
I have '86 w/351, went to start it up had to change impeller. Still ran hot. I checked the tranny cooler it looked clear. Changed thermostat, and cleaned out hoses. When I started it, it ran about 160 for a while then the temp shot up over 170 to 180, let it run it did not go down, shut it off let it cool down started it up again and it did the same thing. While doing all this I notice a water leak (drip) when not running, but more while running, I think it is the freeze plug. Could this be causing the overheating?

6ballsisall
06-30-2006, 03:56 PM
I have '86 w/351, went to start it up had to change impeller. Still ran hot. I checked the tranny cooler it looked clear. Changed thermostat, and cleaned out hoses. When I started it, it ran about 160 for a while then the temp shot up over 170 to 180, let it run it did not go down, shut it off let it cool down started it up again and it did the same thing. While doing all this I notice a water leak (drip) when not running, but more while running, I think it is the freeze plug. Could this be causing the overheating?

Is the leak coming from your waterpump weep hole?

tex
06-30-2006, 03:57 PM
Some guys are having this problem when looking at the Meagan Majors pics!

6ballsisall
06-30-2006, 03:59 PM
Some guys are having this problem when looking at the Meagan Majors pics!

I don't want to know about their "leaking" problem though......... :D

cgarmon
07-01-2006, 02:53 PM
I don't think its the waterpump weep hole, found out it is not the freeze plug. Thought there was one in the back of motor, not one there. The water was coming from around the starter, the water must have gotten in the breather hole on top of starter. Not sure. Cranked it up again today ran around 170 to 175 never got any hotter, or any cooler. Is this a normal reading? I thought it used to stay around 160. 140 deg. therm.

Hoff1
07-05-2006, 07:32 AM
In my boat, the 143 thermostat keeps the engine about 160, the 160 thermostat kept the engine about 175 or so. But, that is also relative to your lake temperature.

Could be the water pump is not pumping as much as it should?

brady1022
07-10-2006, 05:03 PM
There are two types of thermostats that you can use...only one works properly and they're a littler bit tricky to find, at least in my case. For that 351, you'll want the 143 thermostat, but make sure you have a highflow, as in they use them for high power engines in hot rods and such. So make sure that you've got that highflow thermo.

cgarmon
07-10-2006, 10:44 PM
thanks for the info.