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Posted by Keith in Washington on Wednesday, December 03, 2008 at 13:51:24 :
In Reply to: Drove truck today Dec 1 was like spring posted by Glen Idaho on Monday, December 01, 2008 at 20:47:22 :
Check to see if the PCV is stuck. It should not be building any pressure. The PVC if I remember is just a ball valve on the PW. Diassemble and soak the whole thing (PVC valve and tubing) in cleaning solvent for a couple of days to get rid of the baked on oil and sludge. It has got to be thick in there after all these years. Also check the orface on the intake manifold where the PCV valve line is attached. It also could be plugged. On one newer truck of mine, it was plugged so badly I had to use a small drill bit held in my hand and rotated to "drill out" the orface. Also check the orface on the block where the PCV line attaches to make sure that it is clear.
I wonder if you may have another issue. If you are building up that much pressure, you might have excessive blow by. Warm the engine up and do a dry compression on each cylinder followed by a wet compression check (squirt a little oil in each cylinder). There should be only a few pounds difference between the wet and dry if the rings are good. Be sure to have all spark plugs out when doing the compression check in case there is a head gasket problem.
If this engine has been sitting for quite a while you could have a stuck ring. If so, keep running it and change the oil very often (oil is cheap relatively). Give the engine time to clean it self out.
If you are blowing off the oil filler tube, that tells me that me you should do the following: Take your oil filler tube cap and soak it in solvent to clean it. If it is like mine it is vented and the screen mesh filter in it is probably plugged. There is also most likely a tube that runs from the oil filler tube to the carb clean it out and make sure that it is not plugged. Also check the carb orface when it connects to see if it is plugged. If you are blowing your oil filler tube out both of these are plugged.