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Unread 01-16-2014, 02:25 PM   #1
TrucksBootsNGun
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1988 MJ Comanche 
 
Join Date: Aug 2013
Location: Flagstaff, ARIZONA
Posts: 46
Another Valve Cover issue....

The aluminum valve cover was leaking like crazy even after trying two different gaskets. So i put a '97 Cherokee cover on (supposed to leak less and have less blow by) because it is not aluminum it does not heat up and expand as much. Well the leak is better but still blowing a lot of oil. Suggestions? and yes i cleaned both the head and the cover every time.

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Unread 01-21-2014, 03:33 PM   #2
TrucksBootsNGun
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1988 MJ Comanche 
 
Join Date: Aug 2013
Location: Flagstaff, ARIZONA
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Found out while running a tap through the holes to clean them that the driver/exhaust side the holes are not through holes like on the passenger side. The '97 valve cover is thinner and the bolts were bottoming out. Shortened the bolts and cleaned them up seemed to have solved the issue.
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Unread 01-21-2014, 07:30 PM   #3
cruiser54
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Quote:
Originally Posted by TrucksBootsNGun View Post
The aluminum valve cover was leaking like crazy even after trying two different gaskets. So i put a '97 Cherokee cover on (supposed to leak less and have less blow by) because it is not aluminum it does not heat up and expand as much. Well the leak is better but still blowing a lot of oil. Suggestions? and yes i cleaned both the head and the cover every time.
Who ever told you about the aluminum valve cover and it's expansion is full of crap BTW.
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 01-22-2014, 04:36 PM   #4
TrucksBootsNGun
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1988 MJ Comanche 
 
Join Date: Aug 2013
Location: Flagstaff, ARIZONA
Posts: 46
Well I'm no longer finding oil in the air filter and there is not even a drop under the the truck anymore. Also the bolts are no longer loosening themselves (which they were doing with blue lock-tight on them) But even based solely on the metallurgical properties, the thermal expansion rate of Aluminum is 13.1 (microinch/(in F*)). But Cast Steel (3% C) has a thermal expansion rate of 7.0 (microinch/(in F*)). (I actually worked out how much extra force was being exerted on the bolts for EC in one of my classes) I can believe that the Cast Steel Valve cover does in fact expand less due to the fact that thermal expansion is almost half that of the aluminum cover. Having set that aside when holding the two covers side by side you can see the significant difference in the baffling between the two. Also the gasket for a '97 is much much beefer and hugs the curves better to create a much better seal.

Having said all of that the point is there is no longer an oil leak coming from my valve cover.
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Unread 01-22-2014, 05:28 PM   #5
cruiser54
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Location: Prescott, Arizona
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Quote:
Originally Posted by TrucksBootsNGun View Post
Well I'm no longer finding oil in the air filter and there is not even a drop under the the truck anymore. Also the bolts are no longer loosening themselves (which they were doing with blue lock-tight on them) But even based solely on the metallurgical properties, the thermal expansion rate of Aluminum is 13.1 (microinch/(in F*)). But Cast Steel (3% C) has a thermal expansion rate of 7.0 (microinch/(in F*)). (I actually worked out how much extra force was being exerted on the bolts for EC in one of my classes) I can believe that the Cast Steel Valve cover does in fact expand less due to the fact that thermal expansion is almost half that of the aluminum cover. Having set that aside when holding the two covers side by side you can see the significant difference in the baffling between the two. Also the gasket for a '97 is much much beefer and hugs the curves better to create a much better seal.

Having said all of that the point is there is no longer an oil leak coming from my valve cover.
Nor any from my 3 Renix motors with Aluminum valve covers.
__________________
Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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