Can Turbo leak cause low compression on cylinders? - Ford Powerstroke Diesel Forum
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Old 10-09-2013, 03:30 PM
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Can Turbo leak cause low compression on cylinders?

We purchased a 2006 F250 4x4 about a year ago with only 102k miles and little knowledge of the extent of the 6.0l problems. With that being said, we quickly learned that we had egr and oil cooler problems. Truck spent the first month at the Diesel shop, we studded it, deleted the egr, replaced oil cooler, added sct livewire ts. Also replaced updated standpipes and dummy plugs. Early this year became apparent that we had some injectors failing. Finally got those replaced, replaced oil and flushed the coolant. We now have rolling smoke at idle, exhaust leak behind the turbo and plugged ebp sensor/tube.

We have put the truck on a scanner and it shows that at a cold start compression is good on all cylinders, but as the truck reaches normal operating temp, the turbo starts stutter and act like its choking, the compression starts to drop in the cylinders. Can this be just a blown seal? Or does it sound like it is more? Turbo rebuild/replace? Head gaskets?

Last night after getting it put back together and running to town for some fuel, I sat in the driveway letting it cool down. As it started to cool, there was a loud knocking that was not present while driving. We have started truck today to place on scanner, still no codes, lots of smoke (mixture of colors), oil level and coolant level still the same, no knocking noise.

Any help or suggestion would be appreciated? Wish there was an easy button that would let us know that replacing seals on the turbo would fix it! LOL
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Old 10-09-2013, 03:34 PM
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OP

I forgot to mention that we upgraded injectors to Warren Diesel 155 stock nozzles. The turbo is currently stock as well. We have about 100 miles on the new injectors.
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Old 10-09-2013, 05:36 PM
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Sounds like a bad injector or seal. Did you torque down the injector to spec? If not they will lift causing fuel to dump straight in the cylinder can cause a knocking noise. Can you record how the truck runs from under the hood and exhaust and post? Maybe hearing it for ourselves we can help diagnose your issue.


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Old 10-09-2013, 06:33 PM
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Thanks for the suggestion. I will try to post a video tomorrow.
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Old 10-09-2013, 07:10 PM
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I would think if the seal was bad in the turbo you could just remove the down pipe and check for oil coming from the exhaust turbine. If there is no oil you are probably burning oil or excess fluid in the cylinder.

Knocking noise is not good, I had a similar issue after my stud job because I did not torque the injectors to spec they lifted about 1000 miles after the job. It smoked like a freight train.









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Old 10-10-2013, 03:10 AM
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@Bluedemon - I see in your signature that you were looking at going with a MTW Stage 1 turbo? Have you done this yet or do you have any knowledge on the reliability or warranty of them?
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Old 10-10-2013, 07:15 AM
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Here is a video that I took this morning:

2006 Ford F250 6.0l powerstroke - YouTube
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Old 10-10-2013, 07:34 AM
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Quote:
Originally Posted by Impulse6.0Buyer View Post
@Bluedemon - I see in your signature that you were looking at going with a MTW Stage 1 turbo? Have you done this yet or do you have any knowledge on the reliability or warranty of them?
No not yet, but Adrian( mtw) has done a lot of r&d on these vgt turbos and have followed Adrian since he introduced the durastoke back in 2011. Everything I have read from several different members reassures me that he stands behind his work. Saying all this I do not know exactly how long the warranty is but I know he stands behind what he makes. If you want more info contact windrunner he works for mtw and he give you more insight on what they offer.
It really depends on what your goals are as far as hp and tq.
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Old 10-10-2013, 07:47 AM
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I know you don't want to hear this but that looks like coolant, does it smell like burnt oil or diesel? If not you need to put a gauge inline with your coolant over flow line and see if you are building pressure in your coolant system. When you take the degas cap off of the coolant reservoir does it have a lot of pressure?
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Old 10-10-2013, 07:51 AM
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It doesn't smell like coolant, smells more like oil. How would the coolant be getting in?
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