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Hello all and thanks in advance. I have a 93 Pickup 3.0 3vze 4wd manual and after doing my head gaskets everything seems to be ok and engine seems to be running strong (test drove it about 18 miles) and all was well except for an oil leak which I realized was coming from the rear right cam plug. It just pressed the top edge of the seal out bending the retainer, I replaced the seal, brand new oem pcv valve, and fixed the retainer, same thing again. The only thing I can think of that would cause that is maybe a bad valve seal allowing pressure from the combustion chamber to pump up the crank case and blow out the seal. Does anyone else know anything about this problem? Any insight would be helpful thanks...
Hello all and thanks in advance. I have a 93 Pickup 3.0 3vze 4wd manual and after doing my head gaskets everything seems to be ok and engine seems to be running strong (test drove it about 18 miles) and all was well except for an oil leak which I realized was coming from the rear right cam plug. It just pressed the top edge of the seal out bending the retainer, I replaced the seal, brand new oem pcv valve, and fixed the retainer, same thing again. The only thing I can think of that would cause that is maybe a bad valve seal allowing pressure from the combustion chamber to pump up the crank case and blow out the seal. Does anyone else know anything about this problem? Any insight would be helpful thanks...
I find that removing the cam bearing caps and then positioning the cam caps into the head using RightStuff gasket maker with Loctite 515 for the bearing cap surface to the heat and more Right stuff between the cam cap and bearing caps bored surface gets a very robust seal. If you slide them in it never works for very long. Also make sure you do not seal off the return oil port that is in the head or the cap will be subjected to a full head of oil pressure from the bearing that is at the blind end of the cam shaft.
Last edited by Andrew Parker; May 31, 2021 at 05:34 AM.
I find that removing the cam bearing caps and then positioning the cam caps into the head using RightStuff gasket maker with Loctite 515 for the bearing cap surface to the heat and more Right stuff between the cam cap and bearing caps bored surface gets a very robust seal. If you slide them in it never works for very long. Also make sure you do not seal off the return oil port that is in the head or the cap will be subjected to a full head of oil pressure from the bearing that is at the blind end of the cam shaft.
Ok, so I fixed it! Turns out it was the oil return hole that was clogged with sealer. I had already heard about that, I just didn’t know exactly where the oil return was on this. I saw some YT vids of some other vehicles and on them it was just some grooves in the bearing cap on either side behind where the seal goes so I was looking for something similar on this and got confused when I didn’t find it. On these the oil return is a hole behind the cam plug at 6 o’clock of where the camshaft sits just underneath the camshaft. You can see the oil return hole just under the cam here. I used a carb jet cleaning tool to clean it out.
Also (most already know this but just for good measure) with the sealer a little goes a long way. You DON’T want to put too much on. The fsm says only a line down either side in the grooves on the bearing cap is ALL YOU NEED.
May 25, 2021 | 01:21 PM
