Geonovast Posted March 27, 2009 Share Posted March 27, 2009 I've got a 92 4.0 which is destined for a stroker, and when I was cleaning/rearranging the shed yesterday I tapped on it and realized it was the plastic one. I have a metal one off my 88 4.0. Can I put the Renix one on the HO? Are there any advantages/disadvantages to having the metal vs. the plastic one? Link to comment Share on other sites More sharing options...
ren Posted March 27, 2009 Share Posted March 27, 2009 You can run the Renix lid, but I would trim the "towers" so that they are not hanging down like they are now. I would trim them to about 3/4" long, so that they siphon oil off of the top of the head, as the factory length does. You can also just run the late 95 and up which has the full length baffle. I am running this style on all of my 4.0s', but run what you have... Link to comment Share on other sites More sharing options...
aemsee Posted March 27, 2009 Share Posted March 27, 2009 I don't know of any plastic 4.0 valve covers? Link to comment Share on other sites More sharing options...
JeepcoMJ Posted March 28, 2009 Share Posted March 28, 2009 they didn't. no way you have a plastic 4.0 valve cover. Link to comment Share on other sites More sharing options...
Geonovast Posted March 28, 2009 Author Share Posted March 28, 2009 Looks like plastic... Link to comment Share on other sites More sharing options...
ratrapp Posted March 28, 2009 Share Posted March 28, 2009 some of the older 258 cj motors had a plastic cover on them.they were crack prone and i don't know if they would interchage with a 4.0 or not. Link to comment Share on other sites More sharing options...
ren Posted March 28, 2009 Share Posted March 28, 2009 Good point. The 87 and up 4.2 in the Wrongler used a plastic cover, with a couple of brackets that bolted on and were used to hold a BUNCH of non-needed crap. That might be where the plastic cover came from. It might be all that the PO of the engine could find to work on this motor...So, I would be wondering what lead to the swap? Link to comment Share on other sites More sharing options...
aemsee Posted March 28, 2009 Share Posted March 28, 2009 258 VC doesn't interchange with 4.0 Link to comment Share on other sites More sharing options...
TNT Posted March 29, 2009 Share Posted March 29, 2009 4.0 HO engines use an aluminum valve cover. I have a spare one if you need it. :cheers: Link to comment Share on other sites More sharing options...
ren Posted March 29, 2009 Share Posted March 29, 2009 That's odd. I go the one for my MJ off of a 95 model. STEEL, with full baffle, just like the later models. I pulled one from a 98 that was STEEL also. Link to comment Share on other sites More sharing options...
500 MJ Posted March 30, 2009 Share Posted March 30, 2009 Got any magnets Mr. "The Joker"? :clapping: Link to comment Share on other sites More sharing options...
james750 Posted March 30, 2009 Share Posted March 30, 2009 NO, magnets will not attract to aluminum, HO valve covers are aluminum, not steel. Link to comment Share on other sites More sharing options...
jtdesigns Posted March 30, 2009 Share Posted March 30, 2009 NO, magnets will not attract to aluminum, HO valve covers are aluminum, not steel. I guarantee the VC in my 96 XJ is stamped steel.. Link to comment Share on other sites More sharing options...
500 MJ Posted March 30, 2009 Share Posted March 30, 2009 NO, magnets will not attract to aluminum, HO valve covers are aluminum, not steel. Aww - Cmon. I might not be the next Steven Hawkins, but I do know a few things... :idea: :dunce: Link to comment Share on other sites More sharing options...
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