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Old 04-29-2009, 10:30 AM
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coolant leak

I overhauled the 350 in my 91 gmc 1500 about 300 miles ago and I have a coolant leak that I assume is seeping from the back of the block somewhere. The dust cover is slowly dripping coolant out the hole in the bottom. If it is a leak in the back of the block, do you think radiator stop leak would fix it? Any other ideas? Thanks BF

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Old 04-29-2009, 03:07 PM
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the most common water leak on the tbi engines is intake manifold gasket corners

check those for wetness.

we have had to do many
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Old 04-29-2009, 09:48 PM
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most leaks are the intake gasket, leaks out of the rear as fast68 said, but if you just rebuilt it maybe you didn't torque the intake manifold right? you should put a coolant pressure tester on it and find out what is leaking.best bet its the intake like fast68 said, i have done about 40 of these intake jobs on tbi small block chevys from coolant leaks. stop leak will just be a temporary fix. hope its not a freeze plug on the back of the block.if so cheap fix is to use iron-tight.
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Old 04-30-2009, 11:52 AM
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Quote:
Originally Posted by brian12c
I overhauled the 350 in my 91 gmc 1500 about 300 miles ago and I have a coolant leak that I assume is seeping from the back of the block somewhere. The dust cover is slowly dripping coolant out the hole in the bottom. If it is a leak in the back of the block, do you think radiator stop leak would fix it? Any other ideas? Thanks BF
There's soft plug on each side of the block behind the flywheel/flex-plate; hopefully, they were replaced and sealed with your rebuild.

Bogie
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Old 04-30-2009, 04:38 PM
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Those also have those crappy connections on the manifold for the heater hoses. They can dribble a little and run down the back of the block. A good pressure tester should help find the issue. The intake is also real common but new gaskets, especially if you used the real GM gaskets usually wont leak.

Dont put stopleak in it. Find the issue and fix it.
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Old 04-30-2009, 06:18 PM
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please learn me about iron tight for my general knowlede purposes thanks never heard of it.
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