Dumb Noobie Question

[ggcnash]

Probable a dumb question but I have a 91 mj my OEM valve cover is pretty grimy buying a new gasket thought I would go ahead and replace the valve cover also but all the aftermarket covers I find are from 84-90 or 93 on they just skip 91 and 92 why is that and will one of these fit mine the 93 on version looks the same but not sure any help would be appreciated thanks in advance

[yxmj]

You might try searching XJ or YJ covers for the same years they should work if you find them

[HOrnbrod]

The 91-92 only had an oddball cast aluminum cover. The CCV fittings had slots and had to be rotated 90* to seat them. The 93 and up aluminum covers used simple push-in grommets and had no slots. The 93 and up also used larger diameter CCV plastic tubing that was more effective eliminating blow-by. So, the 93 and up covers will bolt directly on the 91-92 head with no problems, but you have to use the 93 and up CCV fittings and tubing. It's a good upgrade too.  :thumbsup:

 

This is a 95 valve cover on my 91. You can see the larger CCV plumbing.

 

[ggcnash]

Thank you very much that answers my question I love your guys knowledge on this forum

[hick92]

The 91-92 only had an oddball cast aluminum cover. The CCV fittings had slots and had to be rotated 90* to seat them. The 93 and up aluminum covers used simple push-in grommets and had no slots. The 93 and up also used larger diameter CCV plastic tubing that was more effective eliminating blow-by. So, the 93 and up covers will bolt directly on the 91-92 head with no problems, but you have to use the 93 and up CCV fittings and tubing. It's a good upgrade too.  :thumbsup:

 

This is a 95 valve cover on my 91. You can see the larger CCV plumbing.

 

Do those hoses need to be ran into the intake

[HOrnbrod]

The front hose on the valve cover goes to the air cleaner; the rear one with the metered orifice goes to a fitting on the intake manifold.  A CCV system with good suck and blow = a clean engine bay.  Well, it helps anyhow............

[hick92]

Well the 2 that go to the intake are just put together on mine