It does not sound good. Is it ruff all the time, idle and under power?
Also when it was rebuilt was the injector system, that would have cause
the problem to begin with, gone through and completly rebuilt or replaced?
I'm trying to understand what you are describing -- is the "hole"
you are referring to the cylinder in the engine block? Are the
rings you are referring to the piston rings on the pistons?
Please be more descriptive. If all the pistons/cylinders look
alike, just describe one piston/cylinder...Franko
I'M SORRY I WAS NOT CLEAR I'LL START AGAIN.THE ENGINE HAD A MISS AND A LOT
OF BLOWBY WE WAS TOLD IT COULD HAVE A HOLE IN THE PISTON SO WE TOOK A HEAD
OFF,THE RINGS I WAS TALKING ABOUT WAS ON A PISTON.WHEN YOU LOOK DOWN IN THE
CYLINDER IT LOOKS LIKE YOU COULD SEE A LOT OF RING AT TOP AND NUN ON BOTTOM
SIDE OF PISTON.THANKS
There should be five piston rings -- each ring is installed in a
groove on the piston. Each piston ring pushes outward to contact
the cylinder wall. With the piston near/at the top of the
cylinder, you should be able to clearly see the top ring and MAYBE
a tiny bit of the second ring (through top ring's gap). I do not
understand "...see a lot of ring at top and none on bottom side of
piston.." Did you drop the oil pan to see the bottom of the
I disagree, there should only be 3 to 5 thousandths of clearance or so
between piston and cylinder bore in a tight engine. If you can clearly
see the upper rings, you may have too much clearance due to improperly
sized pistons in the bore which could case a LOT of blowby.
THANKS FOR THE REPLYS.LOOKING DOWN AT THE CYLINDER YOU SEE MORE RING AT THE
TOP SIDE OF THE CYLINDER THAN YOU DO AT THE BOTTOM.THE DISTANCE AROUND THE
PISTON TO THE CYLINDER IS NOT THE SAME.SOME ADVICE IS IT'S THE CDR VALVE
CAUSING THE BLOW BY.SINCE I'M THIS FAR INTO IT I'M GOING TO PULL THE OTHER
HEAD OFF.THANKS MICKEY D.
Gravity will make piston rest on the lower side of cylinder so that it
not a issue. The issue is if there is too much clearance. I am wondering
if someone bored or honed the cylinders and installed pistons of the
incorrect size. If you can you might pull one piston and mike its OD and
then mike the ID of the bore
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