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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 10-08-2019, 11:41 PM   #1 (permalink)
cruzer747
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Oh give me a hose....

...where the air does not goes...

Hello folks, so I have not been here too much recently but due to some interesting things I thought I would start a new thread and see what you all thought about this. While I am happy to say that if anyone here remembers my corroded deck which I JB welded and that lasted 5k... I am almost 4k on blue devil with what seems like an intact head seal still. I do however have an odd problem and also may have figured out why my JB weld fix was so short lived.

Befroe it gave out I do recall hearing a gurgle in the heater core... but I was really busy and driving hard.... Anyhow, after the blue devil all has been well but I REALLY baby it. However I am working on a new site that has me up and down hills working it a little bit harder and I saw it was almost in the red and I thankfuly was able to pull over and cruise around until the temps came down. It had pushed a bit of coolant out and I saw I was 2 gallons shy!

I thought I had blown it again for sure. I was right at an oriely's so I rented a coolant and cap pressure tester and cap vented at the stated 16psi and the system seemed to hold for two minutes at 18psi. The main cylinder showed 0 signs of coolant when I pulled the glow plug. I had bought a block tester a few weeks prior (it had past with no signs of combustion gasses in the coolant. This time again it passed with no sign of combustion gas.

Here is where my suspicions were heightened.... at idle there was a steady bubble stream of air up through the block tester liquid..... yet it was not combustion. This stream would completely disappear when I gave it throttle. An air leak that must be on the suction side of the pump but not so bad to allow coolant out. The new hose I did at the HG job had a cheap plastic tee and crimped clamps started leaking at about 3 months. I replaced with hose clamps which stopped the leak but perhaps it can still suck air through here?! I called the dealership and they could not get an oem style nor could the autoparts store source one other than the I think Dayco brand I got the first time so I forgot about it at this time.

I ordered a new gates hose as the picture showed the oem vulcanized tee area but it showed up today with again a plastic tee and what look like some sort of heat shrink pvc clamps. I was lucky enough to sorce an old school one on ebay and will take some video for proof of my suspicions before and after swap.


Anyone here have any experience with this? So frustrating! It seemed to slowly grow an air abscess in its nether regions and then overflow some coolant... rinse repeat and you have the fixings for an overheating. Does this sound plausible? If I did not find the NOS on ebay I would have been tempted to look for a brass tee instead.

-edit- oh and one more detail, the low coolant light would not come on until too late for whatever reason in this condition.

Gates old style
s-l1600.jpg
Gates new style
IMG_20191008_192911.jpg
IMG_20191008_192742.jpg

Attached Images
File Type: jpg s-l1600.jpg (83.9 KB, 4 views)
File Type: jpg IMG_20191008_192911.jpg (37.7 KB, 3 views)
File Type: jpg IMG_20191008_192742.jpg (55.3 KB, 2 views)
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Last edited by cruzer747; 10-08-2019 at 11:48 PM. Reason: 1 more detail
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Old 10-09-2019, 01:24 PM   #2 (permalink)
cruzer747
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So re-reading my post I realize that being tired and trying to condense so much into a post as to not bore the reader it reads really horribly. Apologies for that...

That said, my main question is if anyone else has had bad luck (coolant leaking, air intrusion) with the newer style hoses and if there are still any companies making the older all one piece style hoses.

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Old 10-09-2019, 02:19 PM   #3 (permalink)
Sirleitet
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Cut the 2 plastic strips off, take the T-hose adapter to a hydraulic shop and see if they got any brass ones in the same size with a barbed fitting on all 3 ends.


Plastic doesn't belong in the coolant system anywhere in my opinion, only metal and rubber.
Yes. Even the expension tank.
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Old 10-09-2019, 03:05 PM   #4 (permalink)
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Originally Posted by Sirleitet View Post
Cut the 2 plastic strips off, take the T-hose adapter to a hydraulic shop and see if they got any brass ones in the same size with a barbed fitting on all 3 ends.


That is great advice, however I was lucky enough to find a new old one (rubber and metal) which will be here by weeks end.
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Old 10-21-2019, 12:11 AM   #5 (permalink)
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So The lower hose was not the problem :/ trying to figure out where the coolant is going and air is coming in the system. Block test fluid does not change at all yet plenty of bubbles. Fluid changes when it sniffs actuall exhaust stream just to make sure fluid is ok. Checked the easy 6 glow plugs. Pulled the overflow. out, at the moment I did a VERY good burp and purge, clamp off 1"line to lower hose and put clear hose at nipple on radiator, then more line to let it burp upwards. Clear hose shows bubbles that seem to be in a steady rhythm.

There are two things I can think of that are the culprit and am asking for any other ideas.

1) exhaust but not enough to turn the block test solution yellow.

2) cracked head above intake valve letting coolant in the intake but not exhaust gas out. Is there an easy way to test this? Plan is to pressurize system and take the upper plenum off and run a boroscope and stethascope down all the ports....

Not sure how hard a smoke test is but I will read into that. Anyways, just thought I would throw this out there. Thanks!
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Old 10-21-2019, 08:50 AM   #6 (permalink)
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Quote:
Originally Posted by cruzer747 View Post
So The lower hose was not the problem :/ trying to figure out where the coolant is going and air is coming in the system. Block test fluid does not change at all yet plenty of bubbles. Fluid changes when it sniffs actuall exhaust stream just to make sure fluid is ok. Checked the easy 6 glow plugs. Pulled the overflow. out, at the moment I did a VERY good burp and purge, clamp off 1"line to lower hose and put clear hose at nipple on radiator, then more line to let it burp upwards. Clear hose shows bubbles that seem to be in a steady rhythm.

There are two things I can think of that are the culprit and am asking for any other ideas.

1) exhaust but not enough to turn the block test solution yellow.

2) cracked head above intake valve letting coolant in the intake but not exhaust gas out. Is there an easy way to test this? Plan is to pressurize system and take the upper plenum off and run a boroscope and stethascope down all the ports....

Not sure how hard a smoke test is but I will read into that. Anyways, just thought I would throw this out there. Thanks!
Does the upper radiator hose get hard when you start the vehicle?
If it does, that is a sign of a head gasket issue
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Old 10-21-2019, 12:46 PM   #7 (permalink)
cruzer747
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Quote:
Originally Posted by OkDually View Post
Does the upper radiator hose get hard when you start the vehicle?
Not like when I did have a HG issue... as it warms up it will slowly stiffen but not immediately. I will be doing some testing in a few minutes with a friend and report back what the diagnosis is if we find it.

On the list to try is pressure test, smoke test and hopefully twe sets of eyes will find it.
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Old 10-21-2019, 04:56 PM   #8 (permalink)
cruzer747
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Ok, did some tests.... did not smoke test it, peeked at back of intake valves with scope, no signs of coolant. reassembled everything, radiator cap tested and could only maintain 13psi which was rated at 16psi. Replaced cap. pressurized cooling system to 15 psi and it dropped about .1 psi (needle moved verrrry small amount) over 20 minutes. Pressure does not build quickly but at close to operating temp it was approaching 15-16.... I am thinking that it is the slightest HG failure but I will drive it for a day or two to know. There is now a container catching anything that comes out of the overflow so I know if it is spilling out under normal driving rather than being sucked in.... Whatever it is at this point if it keeps up I will be doing a flush and bluedevil round two I guess.

One thing I thought was odd but i do not fully understand cooling systems I guess is that watching the pressure on the system while running, when you would rev the motor the pressure drops, not rises like I would assume with a HG failure.
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