I have had the rocker cover gaskets replaced 3 times in the last 2 years. The most recent when I had the motor rebuilt professionally by a reputable mechanical shop. In the past it has leaked both sides but this time after 4 months its back to its normal tricks on my garage floor. Definitely coming from the passenger side rocker cover. Is this an inherant Mitsubishi problem or is there a simple solution. Gaskets used have not been orig in the past.
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Re: rocker cover oil leaks NL pajero 1998 NL
The gaskets may not be at fault; the first time the valve cover was removed it was probably damaged by an impatient mechanic.
Most covers are sheet metal and the gaskets have an ugly tendency to get sticky over time making removal very difficult.
An inexperienced or sloppy mechanic can easy damage the edge of the cover causing a permanent distortion that a gasket replacement cannot correct.
I hope you have correctly identified the source of the leak since a warped cylinder head can also cause oil loss but that would be from the junction of the cylinder and block.
That would be much more expensive to correct than replacing a damaged valve cover.
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When you replace the rocker cover gaskets, clean the surfaces where the gasket contacts the heads and the rocker cover with alcohol and a rag. Make sure there is absolutely no oil residue on either surface. Use a silicon sealer and spread it on the side of the gasket that will touch the head. Position it and use the head bolts temporarily as guide pins to hold the gasket in place until the sealant dries COMPLETELY. Remove the bolts. Now put more sealant on the surface of the rocker cover and install the cover on the gasket gently so as not to disturb the gasket. Install the cover bolts and tighten firmly but not so as to squeeze or deform the gasket. If dine correctly, the gasket will not leak.
1. If the rocker cover has been damaged due to poor mechanical fitment and is no longer perfectly straight; or
2. The rocker cover bolts are not torqued evenly at the correct ft/lbs specification; or
3. If the rocker cover bolts have been excessively torqued in which event the cover will distort and the gasket will be excessively compressed; or
4. The gasket is in poor condition and needs to be renewed; or
5. The gasket fitting is sloppy done in which event you can assume the cover will not have been properly fitted either.
I would be buying a new rocker cover (or a straight used one) before doing the next repair because your original is probably deformed now and will likely never seal properly.
clean around the oil pan gasket area well as some oil leaks are actually rocker cover gasket and filter leaks that run down the block and appear as pan leaks.. Check front crankshaft seal as the oil from there also appears as a pan leak
No this is not mormal. I am assuming you are saying there is oil on the outside of the spark plug and not on the electrode when you removed it. If you have oil on the outside of the plug your valve cover gasket is leaking. Try tightening the valve cover down ever so slightly. DO NOT over-tighten. If that does not work then the gasket will need to be replaced. Unless it is leaking lots of oil, you may just want to live with it as it is expensive to pay someone to replace the valve cover gaskets.
It is most probably the rocker cover gasket. This is enough to install, you just need to source the correct part from your local parts store or dealer. Remove bolts and rocker cover and replace seal. Ensure on replacement, that you use a sealant that is compatible with oxygen sensors, I use PERMATEX ULTRA-BLU RTV Silicone. That seams to work a treat.
Do you notice a puddle under the car? Or smoking when you shut it off? The rocker cover gaskets are the culprit. If you have the spark plugs in a well inside the rocker cover, the will fill up with oil and also leak out the back. You can replace the gaskets, a fairly easy job, you have to pull everything off the top of the engine to get the covers off. And they give you the new seals for the spark plug well with the gasket kit. They only go about 10 years, I replaced mine and they are starting to leak again. Hope this helps.
pull the valve cover gaskets, clean them and replace them, there is no cheater way to do this. To pin point leak you'l need to look closely at the covers if oil is running down the sides towards front or back of motor (theres 2 covers, one front, one rear) if it is, you may be able to tighten bolts, but be careful not to strip them. If they are tight, youl need to change the cover gaskets
i also have the same problem regarding the oil leak. this is due to the spark plug gasket leaking and you will need to replace them. they are circular gaskets about 1.5 inches across that fit to the underside of the rocker covers and prevent oil from seeping down the long spark plug hole. when i investigated my leak i assumed it was just the rocker cover gasket that was leaking but once everything was removed it is obvious.