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Discussion Starter · #1 ·
Finally found you guys again, the computer crashed, anyways;
Coolant is dissapearing and not going into the oil. My guess is that it is being pressured out of the over flow. I can drive it for a couple of hours and then I have to refill it. Could it b a gasket or a cracked head? Both heads and gaskets are brand new.
Thanks. Bob
 

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check t stats, pressure test cooling system.
 

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Finally found you guys again, the computer crashed, anyways;
Coolant is dissapearing and not going into the oil. My guess is that it is being pressured out of the over flow. I can drive it for a couple of hours and then I have to refill it. Could it b a gasket or a cracked head? Both heads and gaskets are brand new.
Thanks. Bob
not the hp4. call heath. could be cracked heads, gasket or block. you don't have chinese heads do ya. Ed
 

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The 18 to 22 lbs of boost ,if used,could be your coming "Big Bang" event,maybe causing the coolant loss now!!! Hope not for your sake!!!
 

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The 18 to 22 lbs of boost ,if used,could be your coming "Big Bang" event,maybe causing the coolant loss now!!! Hope not for your sake!!!
18:1 compression with Marine injectors

Probably won't have much of a bang if he's running 18:1 compression... when stock is like 21.3:1 or something and you can run 15 :)
 

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Discussion Starter · #6 ·
check t stats, pressure test cooling system.
The T stats do work. The temp rises to normal and then steadies until the cooloant is low, then it rises and falls.
 

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Discussion Starter · #7 ·
not the hp4. call heath. could be cracked heads, gasket or block. you don't have chinese heads do ya. Ed
Ha ha, no, not the truck computer, the one in my house. lol, sorry.

No idea which heads, they cost 400 a piece.
 

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Discussion Starter · #8 ·
18:1 compression with Marine injectors

Probably won't have much of a bang if he's running 18:1 compression... when stock is like 21.3:1 or something and you can run 15 :)
I run 15 but it spikes to 18 when it shifts but it drops back to 15 in a second or two as the rpm increases.

Guess I will have to tear off both heads and inspect.
 

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Have you tried just parking it and putting it in fast idle to see if it is leaking externally? (such as hoses, pin hole in the rad, overflow tank) OK, dumb question, but had to ask...

It's either an external leak, or an internal one. If external, you should be able to locate visually. If not visible, then it must be an internal leak. Since you say that the oil level is OK, then it must be leaking into the cylinders and leaving via the exhaust.

JUst my $0.02...
 

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Discussion Starter · #10 ·
Have you tried just parking it and putting it in fast idle to see if it is leaking externally? (such as hoses, pin hole in the rad, overflow tank) OK, dumb question, but had to ask...

It's either an external leak, or an internal one. If external, you should be able to locate visually. If not visible, then it must be an internal leak. Since you say that the oil level is OK, then it must be leaking into the cylinders and leaving via the exhaust.

JUst my $0.02...
I like two cents.:)
 

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Have you tried just parking it and putting it in fast idle to see if it is leaking externally? (such as hoses, pin hole in the rad, overflow tank) OK, dumb question, but had to ask...

It's either an external leak, or an internal one. If external, you should be able to locate visually. If not visible, then it must be an internal leak. Since you say that the oil level is OK, then it must be leaking into the cylinders and leaving via the exhaust.

JUst my $0.02...
Has to be fast idle and up to temp so the t-stat is open.

Some weak spot, the coolant cross over usually have slow leak. Downstream from that is the "T" which is made of plastic, which can get brittle overtime. Replace it with brass or metal T.
All other hoses.
 

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I had the low coolant light kick on twice after I bought the truck and I thought, "Oh Crap. Cracked block." Then I noticed a drop or two of coolant and a little dried crud around the coolant line (hard aluminum) that comes out of the Front PS of the intake. I just moved that a little, and I haven't had the light come back. The crappy fitting seems dry whenever I check it. The level hasn't dropped, and I have just returned from a couple of trips pulling my enclosed, and one of them was about an 800 mile trip. Check that. Very little indication that it was leaking, but that seemed to be the source.
 

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I had the low coolant light kick on twice after I bought the truck and I thought, "Oh Crap. Cracked block." Then I noticed a drop or two of coolant and a little dried crud around the coolant line (hard aluminum) that comes out of the Front PS of the intake. I just moved that a little, and I haven't had the light come back. The crappy fitting seems dry whenever I check it. The level hasn't dropped, and I have just returned from a couple of trips pulling my enclosed, and one of them was about an 800 mile trip. Check that. Very little indication that it was leaking, but that seemed to be the source.
Ive noticed the same thing on my truck. just a minor bit of coolant bleeding out the plastic (rubber?) fitting. hasnt caused any problems yet afaik
 

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Lost colant, Hum.

not in the oil, no external leaks that are noticed

When cold, does the upper radiator hose get hard right away?

Look throught these threads:
http://www.dieselplace.com/forum/showthread.php?t=252676
http://www.dieselplace.com/forum/showthread.php?t=258951
Actually, the leak needs to be pretty bad to harden up the hoses before the engine warms up. ...at least it was on mine. Mine had pressure in the cooling system after sitting all night, but the hoses never hardened up until the coolant got hot.
 

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Discussion Starter · #16 ·
I always have pressure at the res. even after it is cooled down over night. I have to pull the heads and then I'll know. Luv dem Chebies.
 

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Actually, the leak needs to be pretty bad to harden up the hoses before the engine warms up. ...at least it was on mine. Mine had pressure in the cooling system after sitting all night, but the hoses never hardened up until the coolant got hot.

not really. A small leak will build pressure well before the engine warms up.
 

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I always have pressure at the res. even after it is cooled down over night. I have to pull the heads and then I'll know. Luv dem Chebies.

Before you pull the heads perform a quick check by pulling the Tstats and removing the Serpentine belt, thie will allow you to start the motor for a short time and see which side is leaking.

Search on head gasket, tstat, bubble etc to read a few good threads on the subject. You can narrow the leak down to a which cylinder was leaking.


Here are a few to look at that cover blown / cracked heads and testing for bubbles:

http://www.dieselplace.com/forum/showthread.php?t=181265

http://www.dieselplace.com/forum/showthread.php?t=198698

http://www.dieselplace.com/forum/showthread.php?t=201214


This saves time and confirms the problem.

I've used this to locate the cylinder that is leaking, confirming a cracked head that had passed a hot pressure test 2 weeks earlier.
 

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Discussion Starter · #19 ·
Before you pull the heads perform a quick check by pulling the Tstats and removing the Serpentine belt, thie will allow you to start the motor for a short time and see which side is leaking.

Search on head gasket, tstat, bubble etc to read a few good threads on the subject. You can narrow the leak down to a which cylinder was leaking.


Here are a few to look at that cover blown / cracked heads and testing for bubbles:

http://www.dieselplace.com/forum/showthread.php?t=181265

http://www.dieselplace.com/forum/showthread.php?t=198698

http://www.dieselplace.com/forum/showthread.php?t=201214


This saves time and confirms the problem.

I've used this to locate the cylinder that is leaking, confirming a cracked head that had passed a hot pressure test 2 weeks earlier.
You know way too much, lol. Wish I knew what you know. I will try it when I finally get some time. For now I just keep filling the water res. every hour of driving.
 

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Discussion Starter · #20 ·
Hey, maybe I could start a new water injection system, one piston at a time. lol.
 
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