Default 79 cj5 258 valve cover 

Old 03-13-2020, 11:07 PM   #1
hattrck24 is offline
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Just purchased a 1979 CJ five with the 258 engine and a four-speed transmission. It is leaking oil very bad, so I am hoping to replace the valve cover with a new one as well as gaskets. Searching the Internet and I cannot find any valve covers for a 258 that are not for the year 81 or after.

Is there a difference between the 258 engine from a 79 to an 81? Or would the same valve cover work?

Mine currently has a plastic one and whoever put it on last time couldnt get it to seat properly so they just used a ton of goop to try and fill the gaps and it is leaking oil.

Anyone know of a lead for a valve cover for a 79 258 that is metal?

Any help would be appreciated

Thanks

Zac
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Last edited by hattrck24; 03-13-2020 at 11:13 PM..

 

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Default Re: 79 cj5 258 valve cover 

Old 03-14-2020, 10:38 AM   #2
hole is offline
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Can not help with the metal cover, but whatever route you go, FelPro Blue gaskets work quite well

 

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Default Re: 79 cj5 258 valve cover 

Old 03-14-2020, 05:47 PM   #3
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Make sure the leak is from the valve cover. Mine leaked like the Valdez and I assumed it was the valve cover. Well it turned out it was a little from the valve cover but most of it was coming from the fuel pump gasket.


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Default Re: 79 cj5 258 valve cover 

Old 03-18-2020, 09:41 AM   #4
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Those plastic covers are crap. We have an aftermarket alloy one on ours that eliminated the leaks. Pricey but worth it. I think I found ours on eBay.
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Default Re: 79 cj5 258 valve cover 

Old 03-18-2020, 11:24 PM   #5
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I know they make 'em in aluminum, but can't remember where I've seen.

 

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Default Re: 79 cj5 258 valve cover 

Old 03-19-2020, 09:08 AM   #6
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Seems that 81-86 are different than 72-80 in my searches.

Did find these:

https://www.ebay.com/b/Engine-Valve-...27/bn_93306965
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Default Re: 79 cj5 258 valve cover 

Old 03-20-2020, 02:41 PM   #7
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Make sure you have the correct PCV valve.
Be sure it's clean and working.
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Default Re: 79 cj5 258 valve cover 

Old 03-22-2020, 09:07 AM   #8
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The only difference between a plastic valve cover and a metal/aluminium cover is the plastic ones only have 3 or 4 bolts around the perimeter and use plastic plugs on the cover that go in the other holes to keep it from spreading out. Over time the heat and such make it warp. Anyways, your only option would be to go with a new plastic cover or get a metal cover and tap the holes(the holes are there so no drilling), just no threads. If you go the metal route, you will need a bottoming tap, start with a regular tap til it bottoms out them switch to the bottoming tap to thread the rest. The holes are shallow, 1/2"-3/4" maybe. It's easy to do just take your time, don't force the tap, and careful not to get metal shavings inside motor. I want to say threads are 3/8-16 but i might be wrong...

PS: Morris 4x4, Summit Racing, Quadratrac, Amazon, all sell plastic and metal/aluminium covers.

Last edited by Mrpeter63; 03-22-2020 at 09:15 AM..

 

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