Low compression on one cylinder....... - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 10-04-2009, 08:19 AM Thread Starter
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Low compression on one cylinder.......

I did a compression test on my 03 6.0l and I have very low readings on one cylinder. The truck won't start right now so I did the test cold. Was getting high threes on other cylinders but one of them is 155 psi and when I squirt oil down that one it jumps to 175.

Think I have bad rings or could this be a bent valve??

I've only tested the drivers side so far as the passenge side seems very hard to get at....

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post #2 of 11 Old 10-04-2009, 08:54 AM
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just currious, which cylinder on the drivers side had low compression? Ive been having some issues of my own and i think a compression test is going to be the next step.

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post #3 of 11 Old 10-05-2009, 09:59 AM Thread Starter
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It was the first cylinder on the drivers side closest to the front of the engine.

2003 F-350 extended cab long box
8" lift with 37x13.5x18 Procomp Xtreme Terrains
Raceline Rims Renegade 8's Polished
M.B.R.P cool duals
STOCK INTAKE!!!
Bully race pedals ( for racing! lol )
interior off road headache rack
Air hawk mud flaps
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post #4 of 11 Old 10-05-2009, 01:37 PM
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im gona go buy a compression test gauge of my own hopefully sometime this week. What did you use to adapt it to the glow plug hole.

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16" Eagle racing wheels
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post #5 of 11 Old 10-05-2009, 04:15 PM Thread Starter
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I had a compression gauge that I got years ago from MAC TOOLS. It was a kit for motorcycles and atv's/snowmobiles. One of the hoses in the kit fit no problem.

2003 F-350 extended cab long box
8" lift with 37x13.5x18 Procomp Xtreme Terrains
Raceline Rims Renegade 8's Polished
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post #6 of 11 Old 10-05-2009, 04:21 PM
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What were the readings on the other cylinders


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post #7 of 11 Old 10-05-2009, 04:28 PM Thread Starter
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The readings were all in the high 3's but that was with the engine cold...wonder why I would have low compression just on one cylinder...?

2003 F-350 extended cab long box
8" lift with 37x13.5x18 Procomp Xtreme Terrains
Raceline Rims Renegade 8's Polished
M.B.R.P cool duals
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Air hawk mud flaps
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post #8 of 11 Old 10-05-2009, 04:29 PM Thread Starter
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I have the valve cover off now...don't see anything abnormal in the valve train area.

2003 F-350 extended cab long box
8" lift with 37x13.5x18 Procomp Xtreme Terrains
Raceline Rims Renegade 8's Polished
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post #9 of 11 Old 10-05-2009, 06:25 PM
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Since you were able to increase your pressure readings by squirting oil in it. That indicates worn rings/cylinder liner. No change in readings would result if it was vaalve problems. Since most bore scopes are too big to fit in the glow plug hole or the injector hole,unless ya pull the tube. It will be hard to tell a valve without pulling the head.
As to why,well a number of reasons could be why. Bad ring,ring damaged during install,or injector dumping too much fuel and diluteing the oil film on cylinder wall.
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post #10 of 11 Old 10-05-2009, 06:28 PM
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i think i may pull the valve cover off mine some time this week or weekend and take a look for myself also. Ive been hearing a clatering noise.

04' F350 PSD
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16" Eagle racing wheels
Home built 5" Side exit exhaust
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