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Very Low Compression '02 2.4L engine

 
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  #1 (permalink)  
Old 22 Aug 2015, 09:15 pm
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Default Very Low Compression '02 2.4L engine

I just replaced the timing belt, tensioner pulley assembly and idler pulley. As I was putting it back together, I did a compression check, and have 30-40 psi compression in cylinders 1, 2 and. 4. Cylinder 3 I have about 100 psi.

Haynes manual says all should be reading 170-225psi.

Timing is on exactly. I tore off the valve cover and visually confirmed what timing marks were already telling me. None of the valves appear to be bent or damaged.

I checked the coolant, and there was no froth or foam while I was turning the engine over.

Any recommendations or thoughts on how to troubleshoot from here?

Thanks for the help!
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Old 22 Aug 2015, 09:23 pm
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Default Re: Very Low Compression '02 2.4L engine

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Originally Posted by mojodec View Post
I just replaced the timing belt, tensioner pulley assembly and idler pulley. As I was putting it back together, I did a compression check, and have 30-40 psi compression in cylinders 1, 2 and. 4. Cylinder 3 I have about 100 psi.

Haynes manual says all should be reading 170-225psi.

Timing is on exactly. I tore off the valve cover and visually confirmed what timing marks were already telling me. None of the valves appear to be bent or damaged.

I checked the coolant, and there was no froth or foam while I was turning the engine over.

Any recommendations or thoughts on how to troubleshoot from here?

Thanks for the help!
Did your belt break or did the teeth strip off?

You cannot VISUALLY check for bent valves... unless you break one off and embed it side ways in a piston (I did, not on a PT Cruiser)
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Old 22 Aug 2015, 09:23 pm
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Default Re: Very Low Compression '02 2.4L engine

Dry or Wet test..??
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Old 22 Aug 2015, 09:26 pm
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Default Re: Very Low Compression '02 2.4L engine

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Originally Posted by JoeX View Post
Did your belt break or did the teeth strip off?

You cannot VISUALLY check for bent valves... unless you break one off and embed it side ways in a piston (I did, not on a PT Cruiser)
Neither. The tenionser pulley failed (all ball bearings came out). The timing was about 1/4 turn off at the camshaft sprockets.

I was told this is a no interference engine, so no damage should have been done due to that.
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Old 22 Aug 2015, 09:27 pm
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Default Re: Very Low Compression '02 2.4L engine

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Dry or Wet test..??
Ummm...not sure what you mean... I am fairly green.
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Old 22 Aug 2015, 09:31 pm
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Default Re: Very Low Compression '02 2.4L engine



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Old 22 Aug 2015, 09:38 pm
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Default Re: Very Low Compression '02 2.4L engine

Thanks! It was a dry test.
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Old 22 Aug 2015, 10:07 pm
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Default Re: Very Low Compression '02 2.4L engine

Are both arrows pointing up. On the pulleys? Did you take pics of the timing marks before closing up? Also did you have the cam sprocket bolts loose during this? There two line up holes in the cam shafts. If the are at top dead center these holes will be straight up and parallel to each other. You can't bend valves multi cylinders. can out of time with the other cam will show very low compression.
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Old 22 Aug 2015, 10:21 pm
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Default Re: Very Low Compression '02 2.4L engine

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Originally Posted by Busted_PT View Post
Are both arrows pointing up. On the pulleys? Did you take pics of the timing marks before closing up? Also did you have the cam sprocket bolts loose during this? There two line up holes in the cam shafts. If the are at top dead center these holes will be straight up and parallel to each other. You can't bend valves multi cylinders. can out of time with the other cam will show very low compression.
I already had closed up for the day before posting...so no picks yet. However, yes, the sprockets were both saying "up" and the timing marks and the sprockets were perfectly aligned when crank shaft/case marks indicated TDC. I will confirm the next time I am working on it.

In terms of the camshaft sprocket both, no, they were torqued down to the 85ft lbs spec in the Haynes manual.
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Old 22 Aug 2015, 10:29 pm
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Default Re: Very Low Compression '02 2.4L engine

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Originally Posted by mojodec View Post
I already had closed up for the day before posting...so no picks yet. However, yes, the sprockets were both saying "up" and the timing marks and the sprockets were perfectly aligned when crank shaft/case marks indicated TDC. I will confirm the next time I am working on it.

In terms of the camshaft sprocket both, no, they were torqued down to the 85ft lbs spec in the Haynes manual.
When you get the chance to look check that the cam didn't rotate in the sprocket and Scheared the line up pin. The holes in the cams are the best way to check for this. I'm off to bed now. Hope you find your glitch. I truly believe it is a timing issue.
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