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Old 05-20-2013, 09:15 AM   #1
Jeeper
 
Join Date: May 2013
Location: Tyler, TX
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Need help with leaky 4.2 dipstick tube

The dipstick tube on my 258 4.2 has a real annoying leak. I thought this was going to be a real easy fix. I have had two CJ7's with the 258 and I could twist the tube out of the block, but they never leaked either. The tube on my YJ has a backet attached to the tube that is bolted to the block. I removed the bolt thinking the tube would come right out but it feels like the backet is welded to the block. I tried to pull it off and I was using enough force that I was worried about bending the tube. Does anyone know how this is attached so I can add some silicone to the base and end this leak?

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Old 05-20-2013, 10:03 AM   #2
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Hmmm....mine came out w/ a little tug.

Have you made sure your PCV system is functional?

Mine used to leak like crazy until I added a proper PCV valve/vacuum source.

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Old 05-20-2013, 10:21 AM   #3
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I will try to pry on the bracket with something and see if I can break it loose tonight.

I have not checked the PCV system. Do you know of a site that details how to test it?
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Old 05-20-2013, 10:33 AM   #4
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Originally I thought it was leaking from the base of the tube, but it could be leaking from the end of the tube and running down to the base and I just didnt notice. Oil is all over the starter from the leak so its not just a little weeping. Looks like ill have to make a trip home on my lunch break and get more info. Thanks for any help.
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Old 05-20-2013, 09:13 PM   #5
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I spent a couple hours working on the jeep. Maybe someone can help me get the PCV system worked out. The valve cover has two PCV valves with the front valve being the functional valve. The rear PCV valve hose connects to the little plastic breather filter inside the air filter housing. Was a two PCV valve an option from the factory? Where should the plastic filter actually be connected?



This leads back to the oil leak. If you look closing you can see a line on the block where the spray has cleaned the area over time. It is making its way to the starter, but I can never see it leaking with my own eyes. The top portion of the dipstick tube is dry so I do not believe it is spraying from the top.


I appreciate any help that is offered to get this issue solved. Here is what you are helping bring to her former glory.
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Old 05-21-2013, 11:08 PM   #6
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I Think that rear one should have a canister on it and then goes to the air cleaner. fresh air should be coming From that hose and little plastic breather on the air filter housing , to the rear canister and INTO the engine. when I got my Jeep it was set up like yours, and did blow oil from the valve cover and the top of the dip stick. It was only after the Head gasket blew all the way into the cooling ports and I changed it that it stopped building press in the Crank case and blowing oil out.

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