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 Post subject: 87 4.0
PostPosted: Wed Sep 24, 2014 5:13 pm 
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Eagle

Joined: Thu Feb 07, 2013 6:43 pm
Posts: 2028
have an 87 Comanche with a 4.0, factory aluminum valve cover, AW4 and 231 transfer case. the truck has a horrid oil leak from the rear of the engine bay. are these engines like the 258 as far as oil leaks go, and could it be from the rear main seal or valve cover, or did they add more places to leak oil out of, that I could check. I believe the truck has around 172000 miles on it, so it would not surprise me if the rear main was going out of it already. thanks for the info

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1985 eagle wagon - 258
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 Post subject: Re: 87 4.0
PostPosted: Wed Sep 24, 2014 5:35 pm 
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Javelin

Joined: Sat Apr 06, 2013 10:51 am
Posts: 240
Location: Oshkosh, Wis.
The engine is the same as the 258...valve cover, rear main,

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 Post subject: Re: 87 4.0
PostPosted: Wed Sep 24, 2014 6:25 pm 
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Javelin
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Location: manitowoc wi
i never had a 4.0 leak like a 258 plastic though.

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 Post subject: Re: 87 4.0
PostPosted: Wed Sep 24, 2014 8:33 pm 
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Eagle

Joined: Thu Feb 07, 2013 6:43 pm
Posts: 2028
amchornet wrote:
The engine is the same as the 258...valve cover, rear main,

Thanks, that's what I was thinking, I haven't had a 4.0 out yet though.
mudkicker715 wrote:
i never had a 4.0 leak like a 258 plastic though.

It looks like a previous owner messed with the valve cover already. I think that will be the first stop in stopping the oil leak that this thing has. I wish Amc would have improved the rear main, but atleast they left the plastic valvecover off of it.

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1985 eagle wagon - 258
1987 :amc: Jeep Comanche - 4.0


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 Post subject: Re: 87 4.0
PostPosted: Thu Sep 25, 2014 9:28 pm 
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Hornet
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if that valvecover is the same as the later ones (like the 93 I have in my honeybadger sx4) don't screw around with anything other than a felpro permadry gasket. I have had customers want to cheap out, and I haven't had anything else that actually WORKS at keeping a DRY seal other than the permadry. clean both surfaces up, and if they are both flat and smooth, the permadry will keep it dry as a popcorn fart. if the rear seal is leaking, and as bad as you make it sound... and you split the engine/trans to replace it, plan on doing a speedy sleeve. a lot of the times when I have had to replace seals, its because of 2 reasons. #1, seal got hard from use of cheap oil, and NOT keeping up on oil changes. this is known by all the other sludge, and every other seal/gasket ect also leaking for same reason. hardend rubber. #2 reason is the rubber will actually cut grooves in the crank/cam ect what ever metal its sealing on. that's the reason for a speedy sleeve. thin metal sleeve you put over sealing surface, install seal. seal now has new surface to seal on.

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 Post subject: Re: 87 4.0
PostPosted: Thu Sep 25, 2014 10:35 pm 
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Hornet
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Location: North Seattle sort of
First, make sure they didn't plug up all the breathers on the valve cover (take it off and look at the bottom for buildup from blowby) There needs to be a breather going in (originally to the hose to the throttle body. I bypassed mine as a road tube for awhile then ran through a cannister to catch the oil so the filter didn't get soaked) and the CCV (tiny plastic tube from cover to side of TB) gets clogged up as well (take off and clean with sensor safe carb/throttle body cleaner)
The 4.0L has another place aside from the rear seal it can leak from. The oil filter housing has an adapter that has 2 Oh rings that shrink over time and start leaking (mine need doing) Do these before going to the rear seal.

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 Post subject: Re: 87 4.0
PostPosted: Mon Sep 29, 2014 7:51 am 
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Site Admin
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If it is the rear main leaking, don't fret too much, they are pretty easy to do in manche/Cherokees. No need to remove or lift engine, just unbolt trackbar, shocks, and sway links. The axle will then swing low enough to sneak the oil pan out of the bottom (high jack stands required, lol).

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 Post subject: Re: 87 4.0
PostPosted: Mon Sep 29, 2014 8:45 am 
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Eagle

Joined: Thu Feb 07, 2013 6:43 pm
Posts: 2028
thanks for the info, cleaned the vacuum lines out, and it stopped pushing oil out for a while, but the leak came back, so will have to look at it again.

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1985 eagle wagon - 258
1987 :amc: Jeep Comanche - 4.0


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