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post #1 of (permalink) Old 09-13-2012, 09:07 PM Thread Starter
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Motor mounts leaking?

This may be a silly question but Is it possible for an oil leak to occur around the motor mounts on a 258? Here's a little background: I had a large oil leak, likely from the timing cover but I replaced the valve cover, oil pan, and timing cover gaskets/seal. Almost everything under the hood was covered in oil prior to the new gaskets. I cleaned everything I could under the hood, but I missed a few places, of course.
After driving about 60 miles per day (with new gaskets), everyday, for the past 4 days, at varying speeds up to 60 mph, the oil pan, timing cover, valve cover, and engine block are dry, except for a small portion on the block where the pass. side mount bolts to. The mount is oily on top and mostly around it, causing a drip to accumulate and fall to the ground. It isn't running down the block to the oil pan and is only a small amount. After noticing the drip, I replaced the fuel pump mounting gasket. Still dripping. The dipstick tube is slightly saturated at the block but only covers a very small area, not dripping. the distributor does not show leakage.
I think that cover just about everything.
I would think that oil would run down the block if it were cracked at the motor mount mounting location. Or the whole issue may just be oil still dripping from before.

Thanks,
Tim

'88 YJ
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post #2 of (permalink) Old 09-14-2012, 10:29 PM
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Naw. It's likely just residual oil. Let it drain, then clean it; and maybe you will be done or find the leak.

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post #3 of (permalink) Old 09-15-2012, 10:07 AM
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PS. Also try Restore USA - Engine Restorer for oil blow by. It worked for me on 2 258s.

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post #4 of (permalink) Old 09-20-2012, 11:10 PM Thread Starter
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Thanks, Raduckal. I've used Restore before and didn't notice much difference. But I don't mind giving it another go.
I suppose I was joking when I said the motor mounts were leaking. And the leak is just getting worse. I dyed the oil and saw a trail from the oil cap down to the pan. So I replaced the cap. No leak there anymore. So I cleaned the engine again this morning and drove 35 miles to work. From the point where the head meets the block and down to the bottom of the block, and from the front of the block to the distributor is moist, almost saturated with oil. The motor mount seems to collect the majority of the oil as it has pooled up in any possible place on the mount. I replaced the fuel pump mounting gasket as well as the others described above. The timing cover does not seem to be the source of the leak but I will check in daylight tomorrow. I will probably just connect a shop vac to the pcv port and plug the breather to check for holes. And once found, I will silicone the holes, allowing the suction to pull the silicone into the gap.
Any other suggestions or possible areas to check that I have overlooked?
Thanks again,
Tim

'88 YJ
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post #5 of (permalink) Old 09-21-2012, 08:43 AM Thread Starter
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I cleaned the engine again, drove it for about a mile at 30MPH and under, found oil on the fuel pump but not where it meets the block. The oil is coming from the aluminum case of the pump, right below the brass top. Such a strange place for oil to leak...and hopefully the fuel didnt make its way past the diaphragm, into the crank case.
-Tim

'88 YJ
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post #6 of (permalink) Old 09-21-2012, 11:33 PM Thread Starter
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I imagine the leak was at the weep hole of the fuel pump, so I replaced the pump. But isn't this supposed to weep gas, not oil? I have no gas in the crank case and none was found outside the pump, just oil. The top portion of the pump turned as I attempted to loosen the fuel line during removal.
-Tim

'88 YJ
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post #7 of (permalink) Old 09-28-2012, 09:31 AM
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That's a strange leak. The area of the weep hole is open to the crankcase, through the gap where the lever arm reaches in to the cam eccentric, so oil could come out there, but shouldn't. Is it possible that your PCV valve is bad, allowing a little pressure to build up inside the crank and push a mist out into the pump?

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