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Unread 10-12-2013, 10:31 AM   #16
Alex77cj7
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1977 CJ7 
 
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Location: Lafayette, Louisiana
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Checked compression today.. Here's the readings.

image-3727677094.jpg

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Unread 10-12-2013, 10:43 AM   #17
LumpyGrits
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Did you have the throttle open for these tests?
IF not, then redo them.
If you did--------It's rebuild time.
LG
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Unread 10-12-2013, 11:02 AM   #18
Alex77cj7
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Quote:
Originally Posted by LumpyGrits
Did you have the throttle open for these tests? IF not, then redo them. If you did--------It's rebuild time. LG
Damn. No I forgot to have the throttle open. But still even without the throttle open one is at 50 when the others are close at around 120. I dont know what could cause it to still have some compression but it seems like it fires and runs every few rotations or if the engines at a high rpm and it had SOME compression. Which really makes me feel like maybe it's a bent pushrod or bad lifter or something that would let it still build some compression but not enough. I plan on redoing the test tomorrow with the throttle open and then pulling the valve covers and seeing if anything looks bad and doing the leak down test or whatever it's called with the compressor.
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Unread 10-12-2013, 11:04 AM   #19
Alex77cj7
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Honestly if there is anything seriously wrong with the engine I think ill get that engine from that guy and put a bigger cam and then the intake and carb and headers off of this one on it and keep the engine as parts. My dads 360 has a bad lifter and pushrod so we were gonna use the lifters and pushrods from this one on it.
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Unread 10-12-2013, 11:06 AM   #20
MoneypitCJ5
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Try putting some oil in that number 5 cylinder. If the compression readings come up, say from 50 to 115-120, then it's worn out rings. If it doesn't come up, try that air pressure test I mentioned. And if you don't have a compressor, pull that cylinder head and inspect the valves and piston. With the head removed, fill the intake and exhaust runners with water and see if the valves for that cylinder are leaking.

Edit: our posts crossed so some of this is redundant
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Unread 10-12-2013, 11:10 AM   #21
Alex77cj7
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Quote:
Originally Posted by MoneypitCJ5
Try putting some oil in that number 5 cylinder. If the compression readings come up, say from 50 to 115-120, then it's worn out rings. If it doesn't come up, try that air pressure test I mentioned. And if you don't have a compressor, pull that cylinder head and inspect the valves and piston. With the head removed, fill the intake and exhaust runners with water and see if the valves for that cylinder are leaking. Edit: our posts crossed so some of this is redundant
Do you know about how much oil to put?
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Unread 10-12-2013, 11:18 AM   #22
LumpyGrits
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What did the plug look like from #6?
LG
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Unread 10-12-2013, 11:19 AM   #23
LumpyGrits
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Quote:
Originally Posted by Alex77cj7 View Post
Do you know about how much oil to put?
About 1 oz should do it.
LG
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Unread 10-12-2013, 11:30 AM   #24
Alex77cj7
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Quote:
Originally Posted by LumpyGrits
About 1 oz should do it. LG
Thank you so much.
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