1991 mazda b2600I. Does not run, did compression test #1-0lbs,#2-2lbs,#3-5lbs, #4-30lbs. pulled valve cover and everything is turning fine. Dont know how the marks are suppose to line up on the cam gear and the timing chain. DOes any one know how to check if the chain has jumped a tooth? or have any idea what is up with this? Thanks for the help

 

Ok I just did a wet test on the compression and is as follows #1- 30lbs, #2-10 lbs, #3-40lbs and #4-60lbs. would this indicate all of the rings are no good. Also when I tested #1 oil ran into the #2 cyl. also when I did #3 oil ran into #4 cyl.would this indicate a cracked head or head gasket? Any ideas on what is happening here? Thanks

 

???? Yeah, that doesn't sound too good to me. Fluid allowed to run from one cylinder to another definately sounds like an internal problem of some sort.
Wish I had more to offer, but it sounds to me like a tear-down is in order.

Anyone else have any ideas??