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Unread 09-01-2009, 07:36 PM   #1
rcawrse
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Plastic Valve Cover hold down broke

Hi guys,

One of the black washers that hold down the plastic valve cover on 85 CJ7 4.2L 6 broke off. Any idea where to get a replacement piece? I am assuming it is a washer but could be called something else.

Thanks,
Rob

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Unread 09-01-2009, 07:50 PM   #2
spittoon
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the washer broke before the plastic did? thats odd. if you get desperate, i just put on a new plastic cover and have a couple of extra nut/washer combos i could drop in an envelope to you..
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Unread 09-02-2009, 01:08 AM   #3
carnuck
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Or get an aluminum replacement and call it good! (I did mine)
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Unread 09-02-2009, 06:24 AM   #4
Mike Romain
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I am wondering what part you are looking for...

Do you mean those donut shaped washers that go on the rocker bridge bolts under the valve cover? If so, they come with a new valve cover gasket.
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Unread 09-02-2009, 09:27 AM   #5
rcawrse
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The washers go on the outside over what I assume is the engine block head bolt to hould down the valve cover.
I have an aluminum valve cover on it already, but have not tapped the two holes on the driver side. Would that be a better way to go?

-Rob
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Unread 09-02-2009, 01:54 PM   #6
Mike Romain
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Ah, the big washer that is part of the nut that goes on the head bolt. I think I would just use a thick metal washer the right diameter under the nut instead and be very careful how tight I made it. I think loctite is needed on those, they always back off loose.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
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Unread 09-02-2009, 02:11 PM   #7
rcawrse
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I'll give it a shot. Thanks.
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Unread 09-08-2009, 01:36 PM   #8
rcawrse
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Turns out when I took off the aluminium valave cover a chunk from the front broke off. I assume this means the bolts were too tight?
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Unread 09-08-2009, 01:40 PM   #9
JoonHoss
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sounds like it. I would order a new (aluminum) cover, and tap/thread/install it the correct way.

Hoss
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Unread 09-14-2009, 07:21 PM   #10
rcawrse
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any special tool to keep the drill straight when drilling any recommendations? what is the compression and our performance improvement with going to an aluminium valve cover?

The other issue is that the back bolt is basically impossible to get on being so close to the fire wall.

Any thoughts or how have you guys tightened that sucker down?

Thanks,
Rob
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Unread 09-14-2009, 07:27 PM   #11
fish1erp
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Quote:
Originally Posted by rcawrse View Post
what is the compression and our performance improvement with going to an aluminium valve cover?
Rob
Hopefully none.

It's purely decorative, but functional by keeping the oil in the upper end of the motor and not down the sides of the block
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