pop! goes the turbo? 300TDI - Defender Source
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  #1  
Old May 3rd, 2015, 04:18 PM
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Jason Herring
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pop! goes the turbo? 300TDI

I'm driving along the other night, minding my own business, when I go to accelerate from a stop and the truck is barely moving. RPMs are up but there's no umph. I look at the boost gauge and it's "0". Hmm.

Then, suddenly, it kicks in and all seems normal. I start to think about stuck boost diaphrams when suddenly I hear a noticable "pop!" noise. Now the motor is making a more... how to describe it, "mechanical", almost sewing-machine noise, and the boost never goes above 10 (used to go well past "11" and up to 15).

I drove it home. Casual inspection didn't show anything in the pressurized part of the intake that was ruptured, but it was dark. Oil pressure/temp/EGT seem normal.

The next day I drive up to Home Depot and see in my mirror a very large low-hanging fog behind me with a slightly bluish tint. I pull over, inspect and see occasional, but not constant, bursts of bluish-tinted smoke coming from the exhaust.

Thought:

Turbo oil seal broken (would explain the cloud) but what was the pop and why would this reduce boost?
Could something else have caused the seal to break?

I'm assuming either way it's a new turbo step #1.
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  #2  
Old May 3rd, 2015, 04:33 PM
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Jason Herring
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Must have been an unusually clear night to see the moon and stars over the "comforting orange glow" of the Port of Los Angeles...
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Old May 3rd, 2015, 05:43 PM
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mark kellgren
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Almost sounds like a wastegate acting up. in my experience, when turbo seals go, there ain't no coming back. Boom done.

The pop sounds and total loss of boost and power you describes has happened to me before when my lower silicone hose ruptured at the clamp. you sure your pressure side hoses are all good to go and totally sealed?
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Old May 29th, 2015, 03:21 PM
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Jason Herring
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Well, as best as I could see and feel they look secure.. but the considerable cloud of smoke makes me think it's sucking a lot of oil from somewhere. If not through the oil seal on the shaft bearing then where?
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  #5  
Old May 29th, 2015, 03:28 PM
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John B.
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Could be a whole bunch of things other than the turbo. You need to investigate....
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Old May 29th, 2015, 05:16 PM
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Victor
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Same/similar experience with my 200Tdi a couple of times recently - Both times was hose issue (popping off at the clamp) all 90 degrees are about to get changed to silicon.
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Old May 29th, 2015, 06:19 PM
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Jason Herring
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Gotcha. I'll investigate further. Thanks...
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Old May 31st, 2015, 06:36 AM
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300tdi's have a typical problem of the lower intercooler hose delaminating on the inside.

This gives one of the symptoms you describe and is easily checked.

The engine will run but all power is zapped.

I'd check the lower hose to see if it's either slipped off or has gone to jelly.

All the best



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