New Comanche owner! First leak :( - JeepForum.com

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post #1 of 21 Old 03-16-2013, 02:55 PM Thread Starter
ellman605
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New Comanche owner! First leak :(

Hey all.

I'm new to the Comanche side of Jeeps. I had a built wrangler but had to get rid of it due to financial issues. I'm back now with an 88 Comanche. Love it so far. 4.0L, 5 speed. 2wd for now (swap incoming to 4wd to start building.) Its solid except for a slight oil leak I noticed. It's falling down the passenger side and dripping off the tie rod it looks like. Any known issues around that area I should check?

Here's a pic! Look forward to working with this side of the Jeepers!

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post #2 of 21 Old 03-16-2013, 07:52 PM
cruiser54
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Front crank seal.

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post #3 of 21 Old 03-16-2013, 09:06 PM Thread Starter
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Where would that be? First time working on a 4.0
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post #4 of 21 Old 03-16-2013, 09:47 PM
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Quote:
Originally Posted by ellman605 View Post
Where would that be? First time working on a 4.0
Front of the crankshaft, right behind the big pulley.

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post #5 of 21 Old 03-16-2013, 09:54 PM Thread Starter
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Alright. I'll check there. Is it a hard seal to replace?
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post #6 of 21 Old 03-17-2013, 06:13 AM
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You need a harmonic balancer puller. I don't know your skill level.

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post #7 of 21 Old 03-17-2013, 08:35 AM Thread Starter
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I read up about it. I'm skilled enough to get it done as long as I have a general direction =)
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post #8 of 21 Old 03-17-2013, 08:44 AM
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I read up about it. I'm skilled enough to get it done as long as I have a general direction =)
Gotta have a puller. Look at the balancer. If it looks anything like this, replace it now.
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post #9 of 21 Old 03-17-2013, 08:56 AM Thread Starter
ellman605
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Sounds good! I'll most likely do that anyway since the part is only about $50 and I highly doubt it's ever been done. Since I'll be in there anyway might as well do it.
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post #10 of 21 Old 03-17-2013, 09:24 AM Thread Starter
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So I think I found the leak. Now.... What is this and where should it go? Because it was just hanging over the side and down over the front passenger side... Also, on the second picture, is that vacuum supposed to be running somewhere? Or is that being open there correct?

I need the Haynes manual haha
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post #11 of 21 Old 03-17-2013, 09:27 AM Thread Starter
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Also. Looks like the valve cover gasket is bad. Will be doing that first.
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post #12 of 21 Old 03-17-2013, 12:08 PM
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Here ya go.
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Vac Diagram.jpg   Vac harness 7151366.jpg   Vac harness 7151367.jpg  

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post #13 of 21 Old 03-17-2013, 12:17 PM Thread Starter
ellman605
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Ah so looks like the tube on top of the valve cover is supposed to go into the vacuum system? Or am I mistaken.
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post #14 of 21 Old 03-17-2013, 12:35 PM Thread Starter
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Nevermind! Figured it out I think. Front of valve cover goes to airbox, rear of valve cover goes to intake. I'll probably try to bypass the front of the valve cover with a filter by itself. After I do the gasket and clean out the valve cover. I'll be yanking the cover apart tomorrow to clean it and going to clean the entire engine to see where else it's leaking.
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post #15 of 21 Old 03-17-2013, 04:29 PM
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Quote:
Originally Posted by ellman605 View Post
Nevermind! Figured it out I think. Front of valve cover goes to airbox, rear of valve cover goes to intake. I'll probably try to bypass the front of the valve cover with a filter by itself. After I do the gasket and clean out the valve cover. I'll be yanking the cover apart tomorrow to clean it and going to clean the entire engine to see where else it's leaking.
Do this while you've got the valve cover off. Really should have those vacuum harnesses in stock configuration BTW.

Cruiser’s Valve Cover Mod

Most early and even later Renix 4.0s could be bothered by excessive oil in the air cleaner box. A fix from my old days as Service Manager at a Jeep dealership follows. Information was provided to me from a buddy at JeepTech during those days. I don’t believe it ever came out in a Technical Service Bulletin.


Remove the valve cover and turn it over. Next, remove the fluted tubes that are now facing you by removing three screws on each. Chop 1 inch off each of them. Then, about a half inch up from the area where you just sawed them off, drill a half inch hole in the tubes so the holes will face the rear of the valve cover. Clean and de-burr/sand all rough edges nicely, clean with solvent, and reinstall. Don’t be concerned about the chintzy gaskets that will probably crumble into oblivion when you remove the fluted tubes. They can go back together without gaskets.

If you own a Renix Jeep, you'll want to check this out.

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