No COMPRESSION in #4! - Diesel Truck Forum -
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post #1 of 4 (permalink) Old 04-20-2006, 07:01 PM Thread Starter
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Hey everyone,

Bad news today, took the truck to my local repair guy (good friend of mine), turns out the white smoke issue I was having is a little worse than just the glow plugs. I HAVE NO COMPRESSION in #4!!!

He's tearing it down as we speak. It's either a hole in the piston or the rings. The valves are fine.

My question is this. Has this ever happened to any of you? If so, what did you do to fix it? I'd like to get by as cheap as possible since I was & hopefully am still in the process of trading the ole' girl for a 6.0 before the 6.4 comes out.

Any advice is always appreciated.


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post #2 of 4 (permalink) Old 04-20-2006, 08:25 PM
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Originally Posted by Matty

Any advice is always appreciated.



Well since you said that, I'd look long and hard at swapping a Cummins into my Ford before buying a new truck, should something catastrophic happen to my 7.3... None of the options (buying a new 6.0, repowering with a Cummins, doing a complete teardown/rebuild of a 7.3) is cheap, but for the same money, I'd rather see a 5.9 under the hood.

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post #3 of 4 (permalink) Old 04-20-2006, 08:46 PM
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I hate to say it but Seeing you have propane in your sig I would bet you see cracks on the piston top.I seen a 99 that had propane ran through it and had low comp on #3,5 and the piston tops where cracked.#3 being more obvious then #5.I realize that propane can be a great power adder and MPG increaser but with the problems it may cause out way the good.

Another thought would be a dusted motor but the other side would be low also along with #6.

Good luck and if you want to spend the change on a rebuild go for it.If you have the 10k available.

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post #4 of 4 (permalink) Old 04-21-2006, 01:19 AM Thread Starter
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Thanks for the info guys.

Well, I have some good news. They pulled the head today and the piston looks perfect, before they pulled they pressure tested it and it blew by the rings. The inside of the cylinder looked great too.

As far as the propane, I always set it for 10lbs of boost and the flow was set very nominal. A tank would typically last 3-4 months with daily driving.

But again, thanks for the input.

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