0 compression

[ballajb64]

I have zero compression on my motor right now. What are the top things that i need to check? Oh by the way someone did some motor work on the car such as cam, new rockers and pushrods. Could it be because the pushrods are not long enough or too long? or maybe rockers are down too tight?

 

[bentley429]

Um it has 0 compression on all cylinders? How did you test it?

 

[rd]

Improper adjustment of the rocker arms or the pushrod/rocker/head combo is not correct.

You could get this from the timing chain being off and bending the valves so they do not seal.

 

[Gearbanger 101]

Put the spark plugs back in and try again.

 

[BlownFiveLiter]

Valve lash was probably set incorrectly.

 

[stang9150]

I agree sounds like the valve adjsutment is off and that is causing your problem

 

[vristang]

Put the spark plugs back in and try again.

Where do you put the compression gauge if the spark plug is installed?

 

[dcurtis]

It does sound like valves were tightened way way and way too tight.
What cam and rockers did you add, mainly what type of rocker, pedestal or stud mount?

 

[Gearbanger 101]

Where do you put the compression gauge if the spark plug is installed?

I'm talking about the other seven.

 

[ballajb64]

so the valve lash is controlled by the rockers and how tight they are right? i am running a f303 cam, 1.6 ratio crane cam rockers and i am running stud mount. I am also running stock length hardened pushrods. with M-6049-X306 heads

 

[PJC Racing]

I guessing the valve train was never measured for proper pushrod length, correct? You need to correct this issue first and then properly set the lifter preload.

 

[Dark Knight]

I'm talking about the other seven.

Why would you put the others in? It doesnt change compression and it's less of a drain on the battery if all are out.

 

[GDTrumbo]

I'm talking about the other seven.

???? Compression tests are performed with all plugs removed..... My auto mechanics instructor would have pointed & giggled at you.

Plugs in the other 7will adversely affect readings on the 1 your checking, especially if the compression on the others is uneven. During each cyl.'s test, you should give it a good 7 or 8 compression strokes.

Each cyl. should also be tested 3 times and an average calculated.

GT

 

[Gearbanger 101]

I was trying to be ironic, but I see my intent was lost on you guys.

 

[GDTrumbo]

I was trying to be ironic, but I see my intent was lost on you guys.

OH, OK. Hehe. I just couln't believe what I was reading.

GT

 

[Gearbanger 101]

I thought the "" at the end of my statement might have given it away, but I was wrong.