1G Zero compression in all cylinders

[Myway091]

Is that possible or is my tester a pile of crap? Should have grabbed one from work instead buying from Amazon but feeling deflated if motor is shit.

 

[pauleyman]

Is that possible or is my tester a pile of crap? Should have grabbed one from work instead buying from Amazon but feeling deflated if motor is shit.

Unlikely. Check the mechanical timing. Even without that it's easy to tell a car with bent valves and zero compression. When you're cranking you can hear compression stroke. If the car truly has zero compression you'll hear the motor just spin easy

 

[19Eclipse90]

Sure, it is possible. But it is certainly worth double-checking. As Paul said, it’s unlikely but that doesn’t mean zero chance.

 

[Myway091]

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[twicks69]

That sounds like compression tester fail more than cranking of zero compression. Give another tool a try first.

 

[Justin DuBois]

That sounds like compression tester fail more than cranking of zero compression. Give another tool a try first.

Agree - the sound of it cranking sounds like it is trying to build compression

 

[pauleyman]

I agree also. You hear the cyclical sound it makes? If it had no compression at all you'd get a constant whir. Leakdown is helpful also.

 

[Myway091]

Copy. Figured as much. I will grab a different one tomorrow.

 

[Myway091]

I agree also. You hear the cyclical sound it makes? If it had no compression at all you'd get a constant whir. Leakdown is helpful also.

Tried a new tester. Zero compression so either I am doing it wrong which is possible or this thing jumped timing. We have no history on the car. Guessing leak down is next. If motor is done another one goes to junk yard. Lame

 

[pauleyman]

Tried a new tester. Zero compression so either I am doing it wrong which is possible or this thing jumped timing. We have no history on the car. Guessing leak down is next. If motor is done another one goes to junk yard. Lame

Take the front timing covers off and look. Why would you scrap it just for bent valves?

 

[DSMPT]

Are the cam gears rotating while cranking?
Please upload a pic that shows both cam gear's position from center/straight with the crank timing mark set. So we can check the valve timing.

 

[Myway091]

Are the cam gears rotating while cranking?
Please upload a pic that shows both cam gear's position from center/straight with the crank timing mark set. So we can check the valve timing.

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[Myway091]

Cam gears are rotating and I looked in cylinder with the plug out and the pistons are moving.

 

[DSMPT]

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Was this pic taken when the piston #1 and #4 at TDC? If so, then you have 1 tooth off (retard) on the exhaust cam gear, but that wouldn't cause zero compression.

If you rotate the crank manually with and without spark plugs, can you recognize difference between with and without spark plugs? If there is some compression, at least you should feel it heavier with spark plugs while cam dowel pin position is passing 12, 3, 6 and 9 o'clock.

If it has healthy compression, when you stop cranking by starter or stop the running engine, the cam dowel pin position should usually (most of time, there is exception though) stops around at 1:30, 4:30, 7:30 or 10:30. Like the video below, the piston in compression stroke would be pushed back a bit at the end of crank rotation.
If you see the dowel pin position often stops exactly at 12, 3, 6 or 9 o'clock, then there is a big chance that there is no or very low compression for some reason most likely bent valves or totally wrong valve timing.

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[Myway091]

Was this pic taken when the piston #1 and #4 at TDC? If so, then you have 1 tooth off (retard) on the exhaust cam gear, but that wouldn't cause zero compression.

If you rotate the crank manually with and without spark plugs, can you recognize difference between with and without spark plugs? If there is some compression, at least you should feel it heavier with spark plugs while cam dowel pin position is passing 12, 3, 6 and 9 o'clock.

If it has healthy compression, when you stop cranking by starter or stop the running engine, the cam dowel pin position should usually (most of time, there is exception though) stops around at 1:30, 4:30, 7:30 or 10:30. Like the video below, the piston in compression stroke would be pushed back a bit at the end of crank rotation.
If you see the dowel pin position often stops exactly at 12, 3, 6 or 9 o'clock, then there is a big chance that there is no or very low compression for some reason most likely bent valves or totally wrong valve timing.

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Plugs in or out it is pretty hard to turn . I think I found tdc.

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[curt-s]

Look at your harmonic balancer timing mark on the lower timing cover. Assuming the balancer didn't separate, which is a pretty safe bet, the mark there will tell you if you're at TDC. You can see it by looking into the small gap space in the engine bay. You'll need a flashlight probably.
Then you can check your cam gear alignment.

 

[pauleyman]

Plugs in or out it is pretty hard to turn . I think I found tdc.

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If you're even close to TDC at number 1 with that screwdriver then yes, you have bent valves.

 

[Myway091]

Yeah there is no mark anywhere I can find on here but the timing belt can be moved by hand back and forth , you can’t pull it off completely but it definitely looks suspect. . It had to of jumped. That is why they parked it.

Car has rust so that is why we will probably part it out. I will see what they want to do. Thanks for the help guys. Go for a drive for the fallen.

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[pauleyman]

Yeah there is no mark anywhere I can find on here but the timing belt can be moved by hand back and forth , you can’t pull it off completely but it definitely looks suspect. . It had to of jumped. That is why they parked it.

Car has rust so that is why we will probably part it out. I will see what they want to do. Thanks for the help guys. Go for a drive for the fallen.

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Exterior looked reasonable. Undercarriage pretty bad?

 

[Myway091]

Exterior looked reasonable. Undercarriage pretty bad?

Yeah it is pretty bad if it is a non runner. I was willing to make an effort because working on it is kind of therapeutic. But this is going to be a little more than I can handle. The rust always looks way worse with a blown motor.

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[DSMPT]

Plugs in or out it is pretty hard to turn . I think I found tdc.

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So this is the piston #1 at TDC, the green screwdriver at the highest point? Then the valve timing is completely messed up.

You shouldn't use the timing mark on the timing cover and crank pulley to verify the valve timing in this case. It's not safe, if the crank sprocket dowel pin has gone and if the person who installed the pulley didn't know about that, then the mark may have been off by 90,180 or 270 degree.