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Unread 11-22-2006, 04:29 PM   #1
gtrpup2
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Changing valve cover gaskets/valve covers

I've been putting this off for awhile but i'm thinking I'm going to do it this weekend. What needs to be done before I remove the old covers and gaskets? Is it as simple as removing the bolts and then just putting everything back together?

I've never done anything directly to the engine before and thought I'd ask you guys.

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Unread 11-22-2006, 06:34 PM   #2
Joey_B
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ya, I think that's about it. Make sure you scrape clean both the valve cover and the mounting surface. Watch out you don't get anything in the rocker assembly. I would cover them with a plastic bag or something while your cleaning the mounting surface. I believe you should use some gasket sealer too.
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Unread 11-22-2006, 06:39 PM   #3
gtrpup2
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so i don't need to drain the oil? I just undo them and replace them?
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Unread 11-22-2006, 06:48 PM   #4
KrazyGimp
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I am not sure if it's needed on the Jeep because I've been to lazy to do the swap and have been held up installing a new clutch. But everytime I have pulled the valve cover off of an engine I usually drain it. I guess it just gives me a reason to put in new oil.
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Unread 11-22-2006, 06:51 PM   #5
Joey_B
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Anytime I've done a valve cover gasket I didn't drain the oil, but it's usually so low because of the leaky gasket that I didn't have to
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Unread 11-22-2006, 07:17 PM   #6
gtrpup2
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that wasnt what i wanted to hear but thanks for the info guys. I asked because i just barely changed my oil like 2 weeks ago. I won't be due for awhile.
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Unread 11-22-2006, 07:24 PM   #7
Joey_B
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You should be okay to change the cover gasket without draining the oil. All the oil falls down into the oil pan when the engine is off. A small amount will be left around the rockers but no more then if you drained the oil anyway.
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Unread 11-22-2006, 08:28 PM   #8
Galt
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If you decide to swap to one of those alluminum upgraded covers you will have to drill and tap a few new holes in the head.
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Unread 11-22-2006, 08:32 PM   #9
Hunt_Nevada
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No Oil Change Needed

Keep your old oil. If you remove the cover (while not running, of course) and oil comes out, you've got FAR too much oil! The oil up on the valves is thrown there while running.

But like was said before by Hey Now, you will likely need to drill/tap a few new holes. A very few 258's are already set up for a simple bolt/unbolt job.
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Unread 11-22-2006, 08:41 PM   #10
gtrpup2
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Quote:
Originally Posted by Hey Now
If you decide to swap to one of those alluminum upgraded covers you will have to drill and tap a few new holes in the head.

i will? That doesnt sound like something I want to do. Don't they make them to fit the engine/stock holes?
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Unread 11-23-2006, 10:58 AM   #11
marmaduke
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Nope, on my '86 I had to just tap the two holes on the manifold side, simple enough even for me, the ones on the spark plug side matched straight up then just saw the studs off the rocker bridges as aluminium covers don't use these.
I never had to drain the oil, just make sure that when you're cleaning the surface no bits go down the push rod holes.

Good luck
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Unread 11-23-2006, 09:07 PM   #12
gojeepin
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I have an '83 and all the holes were drilled but only the front and back were tapped. It wasn't hard to tap all the rest.

I did have to cut the studs off the top of the bridges. I used a large magnet to catch all the filings from the cutting and tapping.
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Unread 11-23-2006, 10:54 PM   #13
wswartzwel
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On my 81 CJ7 with 258CI, the side holes were drilled but not tapped...I had to drill the front and back holes and tap them all (used grease and rags to keep filings out of the engine)... I removed the rocker bridges and cut the studs off them at my workbench to avoid metal filings... The conversion from plastic valve cover to aluminum, was the best mod I did... I have zero oil leaking from my engine now..
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Unread 06-10-2009, 03:00 PM   #14
smitty586
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I just replaced the plastic cover with the aluminum. I also had to tap some holes. However, I had to tap for the larger 5/16-18 bolts because the two 1/2-20 already had partial holes in the engine. The 1/2-20 wouldnt tap correctly. Also, how did you get to that bolt in the very back? On my 83 cj7 there is barely any room to get a finger to it let alone a socket.
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Unread 06-14-2009, 03:11 AM   #15
marmaduke
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For me that was always the one I'd put in place first while there was still a bit of movement from the cover, then when it came to tightening up the bolts I seem to remember having just about enough room to get a ring spanner on it to tweek it up a bit.

Hope this helps, if all else fails get a v8, plenty of room then
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