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Old 03-11-2012, 09:48 AM
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Exclamation HELP! NO COMPRESSION

Hello, so i went and bought a snap on compression tester with the adapter to fit my 97 with the 7.3l engine. I was testing the first cylinder and i think my rocker arm hit the tester and bent the tester a bit. This made the tester hard to get off so i removed that arm and the push rod to get plyers around the tester. I got it out and then put it back together. I went to test it again and i am getting 0 compression out of that cylinder. The other cylinders on that side still read 340psi so i know its not the gauge. I wonder if maybe the tester pushed the injector and loosened that up?

Any help would be appreciated! Thanks
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Old 03-11-2012, 11:11 AM
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Are you sure that the push rod is seated in the lifter correctly? Sounds like you have a valve that is not closing.
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Old 03-11-2012, 03:19 PM
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yea, that was it. =) I took it back apart and lightly tapped it with a hammer to make sure it seated and then put it all back together and she has compression. 360psi on all 8, and thats with a cold engine.
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Old 03-11-2012, 03:43 PM
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Sounds good. So what made you do a compression test.
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Old 03-11-2012, 03:54 PM
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Well i was changing all my glow plugs so i was in there anyways.. Plus the truck has 270k on it, and ive thought about getting some injectors. Just wanted to make sure the engine was still healthy and could handle mods
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Old 03-11-2012, 04:00 PM
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Looks like your good to go. I bought my truck with 250k on it bone stock and started modding it at 266k miles.
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