vitt4300

We have a new motor all new parts. We hook it up and we get 0 compression. Any ideas without tearing down the motor. The car has sit for awhile since the motor was assembled.

dawson1112

There are a lot of variables here.

Lets look at the most obvious, New rings never ran = 0 oil on the cylinder walls. Sitting for how long? Pour a little oil in each cylinder and manually turn the crank with a breaker bar, several rotations. See if we can get the rings to seat against the cylinders. Now after you rotate the crank by hand 10 or 20 times check compression again.

If you still cant get any compression , you have to start looking at what could cause a 0 compression situation. IE... push rods incorrectly installed/or too long for cam aplication. Was the valve lash set correctly? Were the head gaskets installed and torqued to specifications?

mjr46

new motor or not, oil on cyl walls or not, you should not have 0 compression in either case........check valve adjustment.........how was cam timing checked on set up??

Maxwelhse

Install spark plugs? Close the pressure relief on the gauge if it has one? Are you sure the gauge is screwing into the heads?

If its not something that blatantly silly, the valves are all way out of adjustment or the push rods are way off length. Did you check every cylinder and get 0 across the board? If so and you checked the valve train over (including cam timing... but getting NOTHING across all 8 would be weird even with horrible timing) and it came up good then its time to start pulling pistons and heads.

88 orangepeel notch

That's if there are pistons even in there lol.

Sorry, couldn't pass that up.

OP, who rebuilt this motor? Or did you just buy it this way?

Chromeshadow

are you sure your compression gauge works? if it is-sounds to me like the valves are not opening and closing.

dawson1112

Lmao,,,, empty block with cardboard heads

Maxwelhse

LOL.. Like the fake computers and TVs they used to put in the displays for cheap furniture.

Maybe its one of these!

http://www.vanpeltsales.com/FH_web/replica-engines.htm