02 7.3 compression - Ford Powerstroke Diesel Forum
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post #1 of 84 Old 03-27-2012, 04:55 PM Thread Starter
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02 7.3 compression

I recently had a compression check done on her and I found out that the compression was 420 on seven cylinders and 390 on cylinder number five. This test was done warm not cold. Now the mechanic who is very trustworthy said my smoking on a cold motor is due to low compression and he is estimating the cold will be 300-320 cold on that cylinder five.

He then explained to me the cutoff minimum is 340 cold. If it comes back that low what are my options? I was looking at a short block from diesel innovations for 3500. Any ideas input I would appreciate that. She only has 132000 miles.

Chris
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post #2 of 84 Old 03-27-2012, 07:56 PM Thread Starter
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Any help?

Chris
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post #3 of 84 Old 03-27-2012, 09:07 PM
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A lot of guys get on here at work so try to bump it in the morning for a response. It seems like it would have to be really abused to have low compression at 132k have you looked into glow plug related stuff? That seems more likely

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post #4 of 84 Old 03-28-2012, 12:11 PM Thread Starter
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Brand new plugs and relay. Also yesterday buddy of mine saw a load of white smoke with blue tinge to it while I was driving away and the motor was cold. It's 35 up here in ak. This motor is on its way out and money is so tight.
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post #5 of 84 Old 03-28-2012, 05:27 PM Thread Starter
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Any ideas options would be greatly appreciated thanks
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post #6 of 84 Old 03-28-2012, 05:50 PM
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The motor is on it's way out? Are you serious. Wow.
Idc if the GPs and GPR are new in the box, test them. Did you just put them in/on or actually test them first.
You could have UVCH issues.
I'd run fuel treatment, and also some Rev-X or ArchOil like the 6.0 guys do for their injectors. See if that solves your injector issue.


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post #7 of 84 Old 03-28-2012, 06:22 PM
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132k miles, she's just getting broken in good!

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post #8 of 84 Old 03-28-2012, 06:56 PM Thread Starter
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The mechanic changed the number 1 and 5 injectors all the other ones were reringed and tested out good. The compression is 390 on number 5 warm now, cold the mechanic estimates it will be around 300-320. He told me the cutoff is 340. They did a pressure test on the number 5 cylinder and it is leaking into the crankcase, meaning the rings are leaking as he told me. Also the 5 cylinder is beginning to miss too. So he changed the two injectors, 8 new mc gps glow plug relay, driver side valve cover harness. The truck also smokes now when it is plugged in just like it does not plugged in. It idle roughs when not plugged in, in 40 degree weather. I run howes additive every fill up and also power stroke cetane boost too.

I just looked into a long block reman from ford and it is 8170 and a 1500 core charge. Short block from diesel innovations is shipped to alaska 3950. But who knows what is wrong with my upper half? Also I was driving away from work yesterday and my fellow worker was following me said a bunch of white smoke with blue tinge came out of the exhaust the whole time driving down the road.

Chris
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post #9 of 84 Old 03-29-2012, 03:05 PM
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check out blackwater engines long block for around 3100 an 3year 75000 mile warr. need one for my truck an thats about the best price i found
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post #10 of 84 Old 03-29-2012, 05:48 PM Thread Starter
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Ok thanks I will April 16 th is when the truck is getting all the tests done to it to find out the problem I'm having. Today the truck was idling so rough this afternoon felt like water and I know it wasn't because it warmed up and it ran fine. Sounded like it was missing good today.
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