#5 Cylinder Low Compression - Ford Powerstroke Diesel Forum
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Old 01-14-2014, 01:02 PM
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#5 Cylinder Low Compression

OK, I finnally did a compression test on the E99 F350! I did the test because the truck has 317k and good amount of blow by. All cylinders were at 370psi cold (had some problems with Everything and did not get a chance until later in the evening after the engine had cooled) Except #5 had about 100psi. I moved injectors from #1 to #5 and the same Results. So it has to be the rings or a cracked piston??? I would like to pull the head to see what the cylinder and piston looks like.

So I guess were I need help is figuring out what too do next?
1. Put back together and drive as is.
2. Pull head and investigate.
3. Can I replace only one piston? Is that good for the motor?
4. Pull motor rebuild it!

Money is not growing on my trees so a fix that will not braek the bank would be nice.

Thank you in advance for the help
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Old 01-14-2014, 01:08 PM
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you could re-do just the one, but it could be burnt valve along with the others you mentioned...depends on how long you plan on keeping it what you do. not cheap in any case
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Old 01-14-2014, 02:15 PM
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Burnt valves? I'll do a leak down test tonight and see what that give up! Thanks
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Old 01-15-2014, 07:24 AM
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OK, got the head off last night and the #5 cylinder has a crack in it. the cylinder wall looks really good. So I think I'm just going to replace just that cylinder and get the head check and call it a weekend.
Does any one have good or bad information on replaceing just one cylinder?
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Old 01-15-2014, 07:34 AM
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it's not ideal but not bad...I'd have it honned and put new rings in the others just because you have it that far doing hone and new rings aint much more work just my
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Old 01-15-2014, 11:37 AM
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At the miles u are at if you plan on going as far as that one cylinder an head (and I do understand the money issue) if you are capable I would check all main and rod bearings also while apart


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Old 01-15-2014, 06:32 PM
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Is your engine stock or any performance stuff done to it?
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Old 01-16-2014, 06:37 AM
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Well last night, I was able to remove all the oil from the other cylinders, from the injectors and pulling the head. So that I could see the #5 wall, hoping it was going to look like all the other ones! Not the case! I should take a pic and post but it has some deep groves in it. Not sure from what though! So I talked to the shop doing the head for me and said he can hone out the block, clean and check the block for rebuilding, for $400. Add $300 to re-install the crack. It will be about $200 for each head. So now my new questions are where to get a good rebuild kit or get parts a pieces from different places to make a kit? Head stud or bolts? Worth the extra money? And just some good old tips on rebuilding a 7.3. Thanks guys
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Old 01-16-2014, 06:39 AM
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Oh and the engine is stock just have gauges!
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