XJ XJ8 / XJR ( X308 ) 1997 - 2003

2002 XJR Crankcase Ventilation System

 
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Old 05-13-2019, 07:10 PM
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Default 2002 XJR Crankcase Ventilation System

Hello All,

I have a very clean and good running '02 XJR with a 150K miles on it. I bought it a few years ago with 139K and have put the last 10K or so miles on it. It has always had a very small valve cover leak that would drip on the exhaust manifold and stink up the place when the oil burned off. I recently did upper tensioners and VC gaskets due to a drivers side tensioner failure. I thought for sure the new VC gaskets would eliminate the leak and it seems they did for the first few hundred miles. However I got on it pretty hard through 2nd and 3rd the other day and it dripped a drop at the rear on the passenger side manifold afterwards again. The engine has good compression 145-150 all cylinders and runs strong with no blow-by. I just feel like the crankcase ventilation system must be restricted a little or something.

Is there a common issue on these cars with the PCV system or does anyone have good diagram of the system on these cars.

Thanks
 

Last edited by jagsandjeeps; 05-13-2019 at 07:20 PM.
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Old 05-13-2019, 08:59 PM
M. Stojanovic's Avatar
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Part-load breather blockage was an issue on all models up to year 2001. Your car is 2002 so it should not have this problem. Anyhow, you can do the procedure described in the attached bulletin.
 
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Old 05-14-2019, 12:02 AM
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Thank you Stojanovic. I will try this procedure and post the results.
 
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Old 05-15-2019, 09:25 PM
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Well, I checked it out. Pulls a very slight vacuum off passenger side valve cover with breather tube disconnected. I did the drill bit clean out on the drivers side. It didn't seem to be plugged though.

The leak seems to be at the very back of the VC around the lower rear bolt but its hard to pinpoint exactly. The bolts were all tight. I might end up changing the passenger side VC gasket again before it's over.

Do these plastic VC covers get warped? I don't want to do this a third time.
 
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Old 05-15-2019, 10:11 PM
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Originally Posted by jagsandjeeps View Post
The leak seems to be at the very back of the VC around the lower rear bolt but its hard to pinpoint exactly. The bolts were all tight. I might end up changing the passenger side VC gasket again before it's over. Do these plastic VC covers get warped? I don't want to do this a third time.
I don't think the warp but they may develop cracks which could be difficult to spot. Remove the cover and inspect carefully the area where it leaks. You may need to use a magnifying glass.
 
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Old 05-15-2019, 10:20 PM
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Originally Posted by M. Stojanovic View Post
I don't think the warp but they may develop cracks which could be difficult to spot. Remove the cover and inspect carefully the area where it leaks. You may need to use a magnifying glass.
Is there any brand of gasket that seem to be the "preferred" type? The gaskets I used just came with the upper tensioner kit that I bought.
 
 
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