1994.5 - 1997 7.3L Power Stroke Diesel  

Compression Test

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  #16  
Old 10-30-2013, 08:10 PM
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Originally Posted by 427 fordman
Well that sucks. Are you gonna try anything else or not? I suppose since you're in there you kind of want to yet.
Yes, I want to keep trying. I have seen these but don't know if the 'quick disconnect' is the same size and will work. I'm guessing yes.


Mityvac , MVA5605 Diesel Glow Plug Adapter - Ford Navistar 7.3L Power Stroke

Mityvac , MVA5618 Diesel Injector Adapter - Navistar

The only thing I can think of is the fitting that goes inbetween the M10 x 1.0 fitting and the grease whip is to long putting the top of the grease whip metal to high. If it was a little shorter then the flexible part of the whip would be where the rocker and push rod is.

Hello Todd, would you take a picture of yours? By the way, what was your compression?

Joey, those numbers are probably a little high, I hope mine are 400+. I've read if your 350+ and 15% of each other, your good but IDK.
 
  #17  
Old 10-30-2013, 09:38 PM
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I will look at my snapon comp tester in morning and see watit says for powerstrokes and try and put up apic if I can ,I bought it wen I was doing my IdI a coupleyears ago
 
  #18  
Old 10-30-2013, 09:58 PM
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Thanks Axel 56.

I think I figured it out. They sold me a wrong fitting making it to tall and putting the metal part of the grease whip to high. This is what I need:

M10-1/8F8OHGS PARKER HANNIFIN CORP. PARM10-1/8F8OHGS CONVERSION ADAPTERM10 X 1/8 NPT PARKER - Marshall E. Campbell Co.
 
  #19  
Old 10-30-2013, 10:15 PM
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my snapon adator number is TU-15 22A its about a 7 inch whip
 
  #20  
Old 10-30-2013, 10:19 PM
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I just noticed that I bought the tester from snapon its made by star products TU-15-53
 
  #21  
Old 10-30-2013, 10:36 PM
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dont know how to put up a pic
 
  #22  
Old 10-30-2013, 10:47 PM
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You have to have photobucket or another service and copy and paste the IMG image onto this page.
 
  #23  
Old 10-30-2013, 10:54 PM
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be no pic then
 
  #24  
Old 10-31-2013, 12:46 AM
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Upload it to your photo album here on FTE, then link to it.
 
  #25  
Old 10-31-2013, 06:20 AM
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The compression gage I used was a steel tube about 3/16 dia. and about 10 inches long then connected to the flex hose and gage.

One end with the o-ring looked like a GP..the other end had a Q-connector

You stuck the GP looking end with the o-ring into the GP hole and run it in finger tight..the other end had a 12 mm nut where the Q-connect fitting was. You gave it 1/4 turn with a wrench.

He did tell me any thing 350 or less was not good.....and any spread between cylinders more than 25 psi was a bad thing too.
 
  #26  
Old 10-31-2013, 07:32 AM
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Originally Posted by 427 fordman
If you don't pull them all out the motor will build compression in every cylinder instead of just the one with the gauge in it. It needs to spin fast to get accurate readings, and will spin much faster with no compression on all the cylinders but one.
I got it. Thanks Darin.

Glenn, I'll go out to the shop and get you a pic here in a bit. The fittings for the GP hole to grease whip where M10 to 1/8npt female to the grease whip. Then 1/8npt female to female and the adapter that came with the kit. Pic in a half hour or so.
 
  #27  
Old 10-31-2013, 09:13 AM
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You don't have to Todd, what happened is they sold me the wrong fitting. The M10 x 1.0 needed the 1/8 npt female end, not the male end on it that they gave me an adapter for making it too 'tall' to get below the rocker.
 
  #28  
Old 10-31-2013, 09:36 AM
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Originally Posted by oldbird1965
You don't have to Todd, what happened is they sold me the wrong fitting. The M10 x 1.0 needed the 1/8 npt female end, not the male end on it that they gave me an adapter for making it too 'tall' to get below the rocker.
Yes. I worded mine wrong as well, but you've got it now!
 
  #29  
Old 10-31-2013, 09:55 AM
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Thanks Todd, now to find one around here. I'll probably have to order it online and WAIT!! Plenty of other stuff to do anyway.
 
  #30  
Old 10-31-2013, 10:00 AM
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No problem Glenn. Disregard my text!
 


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