Question: 84 olds diesel antifreeze spews out overflo at 130 degrees - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Old 04-17-2013, 02:56 PM   #1 (permalink)
marcia
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Icon9 84 olds diesel antifreeze spews out overflo at 130 degrees

Hi hope some one can help. 84 caprice wagon with 5.7 olds diesel. Recently replaced injection pump that had seemingly stopped working, with one I got off ebay. This one wouldn't start either so put old one back on. Car started up just fine and ran great. No smoke. Decided to test drive.

Got several miles when I noticed temp gauge was rising...220 so pulled over and found coolant filled the overflo and was spewing out the top.

This car has never done that in the 3 years we have had it. I have checked everything I can think of...flushed, used prestone super flush and refilled with fresh coolant, new 195 thermostat, no thermostat, new 16lb radiator cap, tried water only. Nothing made any difference. Temp gauge reaches about 130 and you see fluid rising in the overflo tank til it reaches top and spews out the top.

This is in our driveway and doesn't seem to be overheating as it did on the test drive, but the results are the same. Once it hits about 130 on the temp gauge coolant backs into overflo and it fills up and runs over.

On the test drive, I left it where I pulled over for a couple hours and when I got back to pick it up, coolant in Overflo tank had gone down and I was able to drive it quickly back home and coolant again was filling overflo tank without engine being hot.

I read in my cars service manual that the injection pump being retarded can also cause overheating, is that correct.

Any help with this wierd problem will be greatly appreciated.

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Old 04-17-2013, 03:50 PM   #2 (permalink)
PrivatePilot
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If the coolant system is being pressurized it'll cause your symptoms. Common reason for the coolant system becoming pressurized is a head gasket failure or a cracked block.

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Old 04-17-2013, 05:59 PM   #3 (permalink)
marcia
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Thanks for the quick reply. How would i determine if head gasket or block problem? There is no water in the oil or oil in the cooling system. Where would I start my search for problem? thanks again
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Old 04-17-2013, 06:30 PM   #4 (permalink)
05duramax90
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Your head could be leaking between the coolant journals its either cracked there or the gasket is bad


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Old 04-18-2013, 01:00 AM   #5 (permalink)
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Originally Posted by 05duramax90 View Post
Your head could be leaking between the coolant journals its either cracked there or the gasket is bad


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well to make your pump retarded, you could let it hang out with me for a day
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Old 04-18-2013, 01:34 AM   #6 (permalink)
heymccall
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I'd be leaning more toward a damaged water pump impeller, or a bum new t-stat. If it were a head gasket and not localized boiling from no circulation, it could be driven moderately with no radiator cap on, without losing/ pushing antifreeze.
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Old 04-18-2013, 02:36 PM   #7 (permalink)
marcia
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Thanks, New Thermostat to replace this new one going in today. Water pump velocity seems ok. When running with no thermostat during flushing, water in radiator was flowing across like gangbusters.

Yesterday while running in driveway waiting for thermostat to open, temp went to 220 with no noticable open of thermostat but also no push of coolant into overflo as air was being vented from the flush tee just slightly cracked open to vent.
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Old 04-21-2013, 11:18 AM   #8 (permalink)
flyinelvis11
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Broken head bolt is my guess....

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Old 04-21-2013, 03:45 PM   #9 (permalink)
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Retarded timing wont cause it to get hot that fast. Its the same as timing on a gas engine. On a hot summer day it could be a problem but in the spring timing on its own should not cause that.

Having an Ebay injection pump not work is not a big surprise. I can't think of anything in changing a IP that would suddenly cause a head gasket or block issue.

Broken head bolts is not a common issue with the engines. Early engines had inferior quality bolts but by 84 the factory engines had that problem solved. At least solved as well as it could be with the number of bolts and available deck area.

It really sounds like a head gasket problem. Not sure what caused it but its most likely the problem you have now.
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Old 04-24-2013, 10:02 PM   #10 (permalink)
Corts78
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Best thing to do is get a coolant pressure test tool and test the system for leak down.

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