300Tdi Troubleshooting (again) - Defender Source
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  #1  
Old July 8th, 2013, 04:34 PM
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Neill Thornton
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300Tdi Troubleshooting (again)

So after all of the headaches of finally fixing the issues from the big Alaska trip 2 years ago... I got to enjoy the 90 for a few months before the latest thing shows up.

Driving to work today, everything is working just fine, when I start to feel a shudder in the truck. At first I thought I had a tire going flat, but then noticed I was losing power. The problem gradually increased, and then I saw white smoke coming out of the exhaust.

So within 1/4 mile on the freeway I went from slight shudder, to bigger shudder, to loss of power, to white smoke... I was able to get off of the freeway doing maybe 25-30 blowing large amounts of white smoke and park and get a tow.

Got it in the shop, and have started to look at some basics. Don't see any major mechanical issue under the bonnet, no oil leaks, injectors and glow plugs look good.

I can re-start the truck just fine, and it will run in a galloping kind of manner... almost as if cylinders are missing.

The fact that it was gradual and not an instant failure makes me think something was coming loose. My current thought is that the 3 bolts on the front of the injector pump timing cog worked loose and screwed up the injector timing. That might also explain the white smoke, with unburned fuel being sent out of the cylinder.

Only other thing worth noting... yesterday I pulled the tranny pan, gasket, and filter and replaced everything. But the tranny seems quite happy, it's the engine that's angry at me.

What else could it be? Trying to get the differential diagnoses here.

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  #2  
Old July 8th, 2013, 04:47 PM
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Sounds a bit like a head gasket to me but I've never messed with the 300Tdi motors.
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  #3  
Old July 8th, 2013, 04:51 PM
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Neill Thornton
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I am trying to upload a video of it so people can see what's going on.

This had better not be a damn head gasket. Although I guess at this point I have done that procedure so many times I could almost do it during an alcoholic blackout.
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  #4  
Old July 8th, 2013, 05:08 PM
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Neill Thornton
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Video I took on the iPhone... not the best quality, and it's kind of hard to hear the noise the engine is making, but I figured something is better than nothing...

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  #5  
Old July 8th, 2013, 05:51 PM
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First thing you should check is valve clearance, may be a push rod nut came loose.
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Old July 8th, 2013, 06:07 PM
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Trevor Griffiths
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I'd agree that it's missing a cylinder. Can you open an injector union one at a time- essentially reducing fuel to the cylinder- and see if it has any effect on engine performance. That could help narrow down which cylinder to focus on.
A loosening rocker arm adjuster could cause a gradual loss of power and contribute to a misfire, but I wouldn't think it would happen in the time span of covering a quarter mile.
Bent pushrod would be more abrupt.
fuel distributor timing would be across the board, but watching the video, it seems like at least a single cylinder has an issue as opposed to mixture into all 4....
Curious to hear what you find!
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Old July 8th, 2013, 07:46 PM
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I would guess by the white smoke that it is coolant getting into the combustion chamber. Could be a head gasket or a cracked head. If it is a fuel issue, I would think the smoke would be black, not white.
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  #8  
Old July 8th, 2013, 08:28 PM
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unfortunately, I have to agree with Jimmy. I had one do the same thing before it completely blew the gasket and scorched the piston. Have you noticed any Radiator fluid missing?
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  #9  
Old July 8th, 2013, 08:32 PM
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Neill Thornton
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I am just going to say this now. If I blew another F&*#KING head gasket I will be so done with this thing. That will be 5 head gaskets and a whole new Turner head in the 2 years I have owned it.
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Old July 8th, 2013, 08:40 PM
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I feel your pain
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  #11  
Old July 8th, 2013, 09:03 PM
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Valve cover is super easy to pull, I would pull it and see if anything looks oddshould be pretty easy to see an issue with the valve train while running with that cover off and like Trevor said crack one injector line at a time and see what happens.
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  #12  
Old July 8th, 2013, 09:16 PM
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Check the timing and valve lash. Both quick an easy.
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Old July 9th, 2013, 08:19 AM
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Quote:
Originally Posted by navydevildoc View Post
I am just going to say this now. If I blew another F&*#KING head gasket I will be so done with this thing. That will be 5 head gaskets and a whole new Turner head in the 2 years I have owned it.
Why so many head gaskets? Something is definitely not right if you are blowing through head gaskets like that. Cracked block maybe?
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Old July 9th, 2013, 08:33 AM
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Process flaws?

Quote:
Originally Posted by navydevildoc View Post
I am just going to say this now. If I blew another F&*#KING head gasket I will be so done with this thing. That will be 5 head gaskets and a whole new Turner head in the 2 years I have owned it.
Can you go through your torque process one more time in detail?
Has the head or block been surfaced?
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  #15  
Old July 9th, 2013, 10:36 AM
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Quote:
Originally Posted by Jymmiejamz View Post
Why so many head gaskets? Something is definitely not right if you are blowing through head gaskets like that. Cracked block maybe?
Quote:
Originally Posted by rdavisinva View Post
Can you go through your torque process one more time in detail?
Has the head or block been surfaced?
For your reading pleasure:

http://www.defendersource.com/forum/...ad.php?t=32301

http://www.defendersource.com/forum/...ad.php?t=40394
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  #16  
Old July 9th, 2013, 10:51 AM
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Jamie Austin
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When the turbo let go on my old tdi I had clouds of white smoke for some reason.

Easy to check.... remove the rubber pipe from the front of it and give the impellor a wiggle. if it moves more than 1mm or so, it's knackered.
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  #17  
Old July 9th, 2013, 11:22 AM
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this sucks. reminds me of my nightmare. do you have a boost pump? that's how I confirm if turbo is working or not.

this sure sounds like coolant getting into a cylinder to me. but I hope to God I'm wrong. losing coolant would be the tip.
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  #18  
Old July 9th, 2013, 12:07 PM
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BTW, did you replace your head bolts? you mentioned 5 head gasket replacements. bolts can only be used 3 times max. they stretch and it throws torques off. just a thought.
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  #19  
Old July 9th, 2013, 12:27 PM
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Quote:
Originally Posted by Overlander View Post
BTW, did you replace your head bolts? you mentioned 5 head gasket replacements. bolts can only be used 3 times max. they stretch and it throws torques off. just a thought.
Why would you ever reuse head bolts? Stretch or torque to yield bolts are single use only.
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  #20  
Old July 9th, 2013, 01:03 PM
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M&D told me up to 3 times. 2.8 manual states check bolt length and if in spec reuse.
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