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Old September 26th, 2011, 02:30 PM   #1
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I have just swaped out my 1987's 350 for a 92 350. The engine runs great but it is not pumping coolant through the engine. Once I shut the engine off I can hear the coolant bubbling through the tubes and they get hot. I would think that the thermistat is working because it lets the coolant flow after the engine is off. Could it be that I have a big air bubble in the line and the water pump is not priming? This engine swap is my first time doing any kind of work on an engine, so I'm quiet new to all of this. I don't want to crack this block so any input would be great. Thanks guys.
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Old September 26th, 2011, 04:40 PM   #2
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I will assume we are working on a `92. if its the `87 then flip the info over. V belts run clockwise and serp belts are reverse of that

did you use the `92 water pump or the old `87 one? they run in different directions. the new one doesn't have mounting bosses for an alternator. its the reverse run one you need with no bosses on the front.
another thing to check is to make sure the impeller in the pump has fins left on the it. the plate is just stamped steel the paddles rot off
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Old September 26th, 2011, 05:21 PM   #3
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Quote:
Originally Posted by Yetti View Post
I will assume we are working on a `92. if its the `87 then flip the info over. V belts run clockwise and serp belts are reverse of that

did you use the `92 water pump or the old `87 one? they run in different directions. the new one doesn't have mounting bosses for an alternator. its the reverse run one you need with no bosses on the front.
another thing to check is to make sure the impeller in the pump has fins left on the it. the plate is just stamped steel the paddles rot off
All of this and also drill a 1/8th hole in the thermostat to let air purge out while filling with coolant, I have had to do this with just about every sbc I have ever owned to get the air pockets out of the system.
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Old September 26th, 2011, 08:50 PM   #4
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I tried to run the engine with the cap off and all it did was over flow out the top. The pump is not priming. I will take it off and see if the fins are rotted off. The pump is the original for the 92 and it is a reverse run. Both the 87 and the 92 were serp belts. Its throwing me a curve, so the only thing I can think is wrong is the pump itself. Over all the truck run's great I just don't want to replace another engine.
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Old September 27th, 2011, 08:42 PM   #5
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Well I have checked out the price for a new water pump and heater core and for the price I am just going to replace them both and take care of the problem all at once. Thanks for the ideas, they help me learn more about my truck.6


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