no compression

[71cruiser71]

hey all,
i got a early style F motor with the bottom half rebuilt about 10,000 miles ago, with a 71 head rebuilt 1000 miles ago. timing is right everything is hooked up, but im getting NO compression in any cylinders. i reused the head gasket but it only had 1000 miles on it, didnt use any sealent with it either. anyone have any ideas what my problem could be? maybe i need a new head gasket, and maybe use indian head gasket sealent this time?

could it be the head gasket? something else?

Merry christmas to all, thanks for any help

 

[grant5127]

It's not a good idea to reuse head gaskets..... pressurize each cyl with it on tdc and listen as to where the air escapes.....

 

[TLCHopII]

X2 on no reuse of head gaskets. It does seem odd to me that you have measured 0 compression on all 6 cylinders. Would have thought that you'ld register something on most. Lets start from scratch: is the compression test rig in proper working order? IS the o-ring that seals to the head in place and intact?

Again, wouldn't suggest such a rudimentary issue if it were not for the claimed zero compression on all cylinders.

 

[71cruiser71]

thumb in the hole trick

when i mean 0 compression i mean... i dont feel any compression when i put my thumb over the hole. i dont have a compression tester.

i prob shouldnt have reused head gasket. it looked fine, but i will replace if thats possibly the problem

 

[winkle]

You can get a cheap compression tester ( like under 10$) that way you can pinpoint what exactly is going on with it.

 

[inkpot]

Howdy! Sounds to me like there is at least one valve open constantly on each cylinder. I would go thru the valves first to make sure they are right. Did you replace push rods and/or rocker arms? John

 

[Degnol]

When that happened to my JD tractor the cam was broken.

 

[amaurer]

Howdy! Sounds to me like there is at least one valve open constantly on each cylinder. I would go thru the valves first to make sure they are right. Did you replace push rods and/or rocker arms? John

x2. I'd bet you could use a napkin for a head gasket and still measure some compression. Check the valves.

 

[Trollhole]

When you crank the motor over can you see the valves move?

 

[71cruiser71]

yes all the valves move... and when i took the head off my old motor all the valves were adjusted correctly.

i dont know if a head gasket would cause no compression in all my cylinders.

 

[grant5127]

You did adjust the valves after the reassemble?? If not they need to be.......

 

[71cruiser71]

i did not adjust the valves after reinstall... i didnt think that they would need to be? but i guess that sounds like a good place to start.

 

[grant5127]

2 important things that you do not reuse when building an engine..... head gaskets and valve adjustments.........

 

[Trollhole]

i did not adjust the valves after reinstall... i didnt think that they would need to be? but i guess that sounds like a good place to start.

Glad to know you found your issue.

 

[71cruiser71]

haha i will start with the valves and hopefully that wil fix the problem.. thanks!!