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Block test passed still burning coolant

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  #1  
Old 06-01-2014, 04:59 PM
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Default Block test passed still burning coolant

Alright, so my 99 318 half ton is burning coolant pretty bad. I figured a blown head gasket. So before I tore into it I put a block tester on it. After pumping the tester with the truck at idle for way longer than recommended the fluid stayed blue. So can a blown gasket still be the problem?
What do you guys think?
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Old 06-01-2014, 05:38 PM
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Are you getting white smoke out the tailpipe? No puddles on the ground? Oil still look ok?

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Old 06-01-2014, 05:46 PM
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^Same questions as HY.

Also do a compression test, and post your results.
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Old 06-01-2014, 06:56 PM
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Alot of white smoke. Smells like burning coolant. No doubt thats whats happening. Oil is good. No signs of coolant in there.
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Old 06-01-2014, 06:59 PM
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No leaks either
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Old 06-01-2014, 07:47 PM
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I'm not familiar with the block tester, but couldn't a bad intake gasket let coolant slip down into the combustion chambers too?

It's at least cheaper and easier than head gaskets...
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Old 06-01-2014, 08:34 PM
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Idk. Iv never thought of that. I didnt think coolant goes thru the intake manifold.
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Old 06-01-2014, 10:20 PM
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How would I test for a bad intake gasket?
That wud make sense tho. The coolant leaking down the valves? I wudnt have any exhaust gases in my coolant. When I start the truck after it sits for awhile I get a clowd of white smoke. So wud the coolant in the manifold be draining into the cylinders while it sits?
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Old 06-01-2014, 11:17 PM
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Coolant definitely runs through the manifold. That's where the thermostat sits.

It would have to be a pretty round about path to get to the chambers, but I imagine its possible. Never seen it, but possible.

No idea how to test your intake gaskets either. Afraid I won't be too much help here, but the other guys will be, I'm sure.

Try to get a compression test done soon. That's the beet check for what you're dealing with.
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Old 06-01-2014, 11:36 PM
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Alright. Ill have to pick up a tester this weekend. Ill post my results then.
Until then any ideas or other information will be greatly appreciated.
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Old 06-01-2014, 11:52 PM
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Pressure test the coolant system that'd help with tracking down the intake leak if it existed
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Old 06-02-2014, 12:02 AM
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Quote:
Originally Posted by 318DodgeRam View Post
Alright. Ill have to pick up a tester this weekend. Ill post my results then.
Until then any ideas or other information will be greatly appreciated.
The results of the compression test will reveal a lot about whats goin on in there.

You can check the plenum with a dentist mirror, take the air hat off, open TB and have a peak with the mirror. Look for pooling oil. Spray pattern near PCV is normal.
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Old 06-02-2014, 09:48 AM
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I doubt an intake gasket leak would get coolant into the combustion chamber. Passages are good distance from intake ports.....

If it is burning coolant, you either have a blown headgasket, or cracked head. Worst case would be cracks in the cylinder wall, but, you would have had to seriously overheat the engine to manage that......

In any event, heads are going to need to come off. Personally, I wouldn't even bother taking them to the machine shop. Just replace them. You can pick up a pair of NEW, better casting heads, for around 600 bucks.
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Old 06-02-2014, 11:37 AM
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Quote:
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You can pick up a pair of NEW, better casting heads, for around 600 bucks.
Not to thread jack but is that 600 for both? Do you have a link?
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Old 06-02-2014, 02:44 PM
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Not to thread jack but is that 600 for both? Do you have a link?
Yep. From Odessa/Clearwater Cylinder head in Florida.


Titan Engines also has them on ebay, for 560 for a pair. Also with free shipping. Not familiar with them though.
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Old 06-08-2014, 01:54 AM
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Ok I did a compression test on it. Here are the results.

Drives side/ front to back
1. 90 to 80 psi
2. 80 to 85
3. 80 to 90
4. 80

Passenger side/ front to back
1. 100
2. 70 to 80
3. 90
4. 100

Specs say it should be 100psi
What do ya think?
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Old 06-08-2014, 08:47 AM
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Are you sure you have a good, air-tight seal on your compression gauge hose? The numbers seem very low.
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Old 06-08-2014, 08:53 AM
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Main thing is they are alll within 15% of each other.

100-70 is a 30% drop

You have some problems.

Do a wet test, squirt a zlittle oil in cylinder, then see what your numbers are.
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Old 06-08-2014, 10:29 AM
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Quote:
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Are you sure you have a good, air-tight seal on your compression gauge hose? The numbers seem very low.
Yes. I did the test multiple times on all cylinders just to be sure.
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Old 06-08-2014, 10:42 AM
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Quote:
Originally Posted by Ham Bone View Post
Main thing is they are alll within 15% of each other.

100-70 is a 30% drop

You have some problems.

Do a wet test, squirt a zlittle oil in cylinder, then see what your numbers are.
Sorry. OReillys wanted 40 sum bucks for the compression tester so I just rented it instead. Had to take it back yesterday.
They say to put oil in the cylinders to check for worn rings. The truck doesnt burn oil. Just alot of coolant. I know this truck has a serious problem.
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Old 06-08-2014, 10:42 AM
 
 
 
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