Stop that leaking rubber oil fill plug! -

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post #1 of 3 Old 08-10-2013, 03:20 PM Thread Starter
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1983 CJ5 
Join Date: Apr 2012
Location: Grand Rapids
Posts: 748
Stop that leaking rubber oil fill plug!

Hey guys,

I have long struggled with My rubber oil fill plug letting oil seep by and soaking my valve cover.

Well with inspiration from Matt1981CJ7, I took a few pics and wanted to create a post of one way to fix this as I could not find anything.

This is for fixing the issue when it is not caused by a bad PCV valve or excessive blow by.

Here is the rubber oil fill plug.
Ignore the time stamps

The parts, bolt, 2 washers,one rubber washer, nob or fly nut:
Washer should fit just the diameter of the very end of the plug

Drill hole through plug

Put rubber washer on bolt, followed by the washer.

Put bolt through the plug, then place the washer on and spin on either the fly bolt of the nob (many other options)


As you turn the nob it pulls the washer up and tightens the oil fill plug.

I got all the parts from ACE hardware.


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post #2 of 3 Old 08-10-2013, 03:57 PM
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1984 CJ7 
Join Date: Jun 2006
Location: Kamloops
Posts: 4,047
Nice solution, I'll have to put it on the to do list.

One thing I may add is to peen over the end of the bolt after the knob is put on. It's probably unlikely for it to loosen off after it's tightened down but it would be a real ***** to have the bolt and washers fall into the valvetrain.

'84 CJ-7: Yota axles (spartan locked front, e-locked rear) 4" BDS, 1" Daystar & 3/8" shackle lifts, 35" X-Terrains on steelies, YJ Tub & family roll bar, heater blower upgrade, 4.2L w/MC2100 & Team Rush, Warn 8274. Rebuilt 4.2/4.0 hybrid, AX15 and twin sticks/clocking ring waiting to go in.

The advertised position for a topless, dirty jeep girl has been my wife. Thanks to all that applied.
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post #3 of 3 Old 08-10-2013, 04:02 PM Thread Starter
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1983 CJ5 
Join Date: Apr 2012
Location: Grand Rapids
Posts: 748
^^ I thought about that, but the hole I drilled was was much smaller than the bolt, so it is very tight through the plug, you cannot pull it out by hand, I had to twist it out with an allen wrench .

Good Point though, forgot to mention that.

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