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post #1 of (permalink) Old 08-03-2003, 11:53 AM Thread Starter
 
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O/T Coolant system pressure test 1986 Bronco2

I went and borrowed a coolant system tester so I can check the cooling sytem in my 1986 2.9 in my Bronco2(suspected cracked head/blown head gasket). here are my questions. how much pressure do I pump the tester up to? I don't want to cause a leak somehwere if there isn't one already. how long should it take for it to bleed down if there is a leak? anything else I need to know about checking the system or any other tips someone can give me? Sorry for posting this in this forum, but the B2 forum is not very active, and I have been on this forum for years with my jeep, and the members here are more knowledgeable [img]images/graemlins/RockOn.gif[/img]...thanks for the help once again, Ben
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post #2 of (permalink) Old 08-03-2003, 12:04 PM
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Re: O/T Coolant system pressure test 1986 Bronco2

1. Check the Radiator Cap, it tells you the PSI... likely about about 13 - 15 PSI.
2. Slowly increase the pressure in the system,
3. By hand pumping, ramping up the pressure to the rated PSI.
4. Now walk away,
5. And have a Tall, Cool, Full headed Root-Beer,
6. Or better yet, a Root-Beer Float.
7. After downing one, and then another...
8. Come back in about 5 - 10 minutes.
9. Check the gauge...
10. It shouldn't have moved all that much!
11. If it has... you've got a problem.
12. This is a good time to have a Mechanic's Stethoscope,
13. If it is leaking...
14. Sometimes you can actually hear it,
15. And trace the leak down if it's hissing bad enough
16. And you can keep up the pressure! [img]images/graemlins/grin.gif[/img]
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post #3 of (permalink) Old 08-03-2003, 12:20 PM Thread Starter
 
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Re: O/T Coolant system pressure test 1986 Bronco2

thanks for the quick reply, leve!!!...that's exactly what I was looking for. this vehicle was given to me, the PO thought the motor was shot. i am beginning to have my doubts. it doesn't smoke. it does make the normal 2.9l lifter noise sometimes, but just about every 2.9 I have heard does that. The PO thinks it has a cracked head/blown head gasket, because it overheats, but i am leaning more towards a radiator blockage/fan clutch problem. i have ran the vehicle for an hour at a time, just idling, the oil is not milky, and the coolant level is not going down, nor is the oil level going up. I did a compression test, all cylinders are 155-160 psi, so I have pretty much ruled out the blown head gasket. Any how, sorry for babbling, thanks again for the help [img]images/graemlins/RockOn.gif[/img]
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post #4 of (permalink) Old 08-03-2003, 12:25 PM
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Re: O/T Coolant system pressure test 1986 Bronco2

1. Enjoy the BII,
2. I put almost 300,000 miles on my '84,
3. Before I gave it away,
4. IMHO... it's a VERY fine vehicle...
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post #5 of (permalink) Old 08-03-2003, 12:49 PM Thread Starter
 
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Re: O/T Coolant system pressure test 1986 Bronco2

ok, leve, I just did the test. Lost about 2 pounds in 10 minutes. is that a problem? thanks again, Ben
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post #6 of (permalink) Old 08-03-2003, 01:08 PM
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Re: O/T Coolant system pressure test 1986 Bronco2

1. IMHO... yep...
2. Recheck three or four times...
3. Do the test Hot and Cold,
4. Be careful doing it hot,
5. See if you get the same results.
6. Double check what you see by doing it on that Caravan!
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post #7 of (permalink) Old 08-03-2003, 02:38 PM Thread Starter
 
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Re: O/T Coolant system pressure test 1986 Bronco2

I just finished the test with the engine hot. lost about a pound in 15 minutes. I also started the motor with the tester hooked up to the radiator.the gauge went up to 15 psi and stayed there. If there was a head gasket blown, or head cracked, woudn't the pressure have went higher if compression pressure was getting into the coolling system? thanks, Ben
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