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Debugging slightly low boost

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Old Sep 17, 2015 | 05:30 AM
  #256  
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Originally Posted by tjmike
I think the compression test would only show a bad copper gasket - or - maybe a bad injector if it leaks up through the closed off injector somehow?
The copper washer holds the compression in there. A loose injector? Not so much.
 
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Old Sep 17, 2015 | 05:36 AM
  #257  
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Originally Posted by Tugly
The copper washer holds the compression in there. A loose injector? Not so much.
Good point, I should check the torque on the injectors before doing the compression test and note any that were loose.....
 
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Old Sep 19, 2015 | 10:48 AM
  #258  
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Starting on this job now.

Warmed up truck, got driver side VC off. First order of business was to start truck and make sure that the injectors were emitting oil. All 4 on the driver side seemed to be.


On thing I noticed, was that there was smoke (whitish) coming from Cyll 2,4 (front most two on driver side). Even after shutting down it was wisping out for a while (at least a minute maybe a few minutes).

Is this anything to be concerned about?
 
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Old Sep 19, 2015 | 11:16 AM
  #259  
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That should just be a little blowby - it happens. You don't want the choo-choo effect where it can hurl a paper towel into the hood.
 
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Old Sep 19, 2015 | 11:48 AM
  #260  
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From: Asheville-where weird is
x2. That is normal ventilation to keep pressure equalized from the bottom end to the top end.
 
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Old Sep 19, 2015 | 04:27 PM
  #261  
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I assume all these heads are the same. I don't think this HF quick connect will fit without hitting the rocker arm. Is there some special trick?

Also, I just noticed the HF adapters don't have any o-rings.
 
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Old Sep 19, 2015 | 05:26 PM
  #262  
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Here's a photo. When taking the glow plug out. I had a 1/4" 10MM socket, but started with a 1/4-3/8 adapter. The adapter would rub on the "ball" of the rocker arm. Without the adapter there was no rubbing. When I tried to put the quick connect down there, there was no way I was going to get it to line up.








Here's a photo of the adapter trying to mate up, although it would have been better to stick the adapter down more to show the interference.




Should the glow plugs be clean and dry? or is a light black film typically there?

 
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Old Sep 19, 2015 | 06:35 PM
  #263  
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Did you use the approx 6-8" length of hose on the GP adapter, then the gauge?

From the pic, it looks like you were trying to skip the hose? It's the hose in Scottahoe's fingers in his pic of the kit in the red blowmolded case.

We attached the GP adapter to the hose first, then spun it in with the hose. Gotta spin it in quick snaps, as the connection slips. Make sure it starts straight first.
 
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Old Sep 19, 2015 | 07:19 PM
  #264  
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Originally Posted by ExPACamper
Did you use the approx 6-8" length of hose on the GP adapter, then the gauge?
No, the adapter has a 1/8 quick connect. A length of hose would work well. But a hose clamp won't work - because then I won't be able to turn it.




Originally Posted by ExPACamper
From the pic, it looks like you were trying to skip the hose? It's the hose in Scottahoe's fingers in his pic of the kit in the red blowmolded case.
I think that hose is a critical piece. The HF kit doesn't have it.



Originally Posted by ExPACamper
We attached the GP adapter to the hose first, then spun it in with the hose. Gotta spin it in quick snaps, as the connection slips. Make sure it starts straight first.
It looks like that kit, with the straight hose is a better setup than the HF kit. Unless I've missed something.


I think I'm going to bail on doing a compression test. I don't have the tools ( I bought stuff, but it doesn't work :-( ).

I don't think that my root issues point to lack of compression at this point anyway - high egts with load, black fuel filter, "bumpy" EBP, etc.

I'll do the injector o-rings and run a hundred miles or so and then change the fuel filter and seen if any of the measured data changes.
 
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Old Sep 19, 2015 | 07:21 PM
  #265  
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What about the wet GP?
 
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Old Sep 19, 2015 | 07:31 PM
  #266  
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Oil rests around the neck of the GP. I have never been able to pull out a dry glow plug.

This is what I added to my HF compression test kit. The 45-degree elbow aims toward the valley and everything fits.

 
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Old Sep 19, 2015 | 07:52 PM
  #267  
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Thanks for jumping in, Rich. I'm limiting my replies to the things I have experience with
 
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Old Sep 19, 2015 | 07:53 PM
  #268  
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Originally Posted by Tugly
Oil rests around the neck of the GP. I have never been able to pull out a dry glow plug.
OK, I blew out that area, BUT there was a little oil on the threads too so that seems ok.

Originally Posted by Tugly
This is what I added to my HF compression test kit. The 45-degree elbow aims toward the valley and everything fits.
Yes, I did the same. The QC is about 23/32". My 10mm 1/4-3/8 adapter is 20/32". I could turn GP with the 3/8 adapter but it was rubbing on the round part of the rocker arm. When I switched to 1/4" extension all was well. It seems that even if I could muscle the quick connect on, there will still be significant interference with the rocker arm.

I wonder if you managed to get a narrower quick connect in your kit - something closer to 1/2" OD?
 
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Old Sep 19, 2015 | 07:57 PM
  #269  
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OR

do you drop the QC down closer to the injector than the rocker arm and then move it over UNDER the round end of the rocker.

From what I could tell, it seems like the QC would still end up next to the round ball on the rocker, not under it. That when I called it quits....
 
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Old Sep 19, 2015 | 07:59 PM
  #270  
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Originally Posted by ExPACamper
Thanks for jumping in, Rich. I'm limiting my replies to the things I have experience with
You're reply was still helpful - thanks for sharing.
 
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