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Old 10-12-2018, 06:19 PM   #1
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Lehman Leak

My 1976 120 Lehman has just started leaking. Just over 5000 hours runs great and has not used or leaked oil in the past. Maybe a half quart between changes.
It has a leak on the port side very near the motor mount very close to the starter. I cannot see exactly where it is coming from, hopefully some can tell be which casket needs replacing?
I'm hoping to be able to replace without pulling the motor!

Thanks for any advice.
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Old 10-12-2018, 06:33 PM   #2
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Greetings,
Mr. 15. You might try a fluorescent leak detecting dye available at most auto parts stores.
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Old 10-12-2018, 06:37 PM   #3
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Dollars to doughnuts it’s the lift pump gasket.
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Old 10-12-2018, 06:41 PM   #4
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I just had a similar issue. Check your valve cover bolts. Mine had worked their way loose. Oil dripped over the edge and pooled near the top of the motor mount.
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Old 10-12-2018, 06:42 PM   #5
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Lift pump is on other side, could just be dripping down fron valve cover as my aft motor mounts usually have a bit of oil in them after a long run.
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Old 10-12-2018, 07:53 PM   #6
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You’re correct, the lift pump is not on the port side. Rats.
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Old 10-12-2018, 08:06 PM   #7
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Cleaning the area using degreaser may help find the source.
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Old 10-12-2018, 08:49 PM   #8
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I agree, most likely a valve cover gasket
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Old 10-13-2018, 03:42 AM   #9
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Lehman Leak

Take your big flat head screwdriver and tighten your valve cover. A 1 min fix
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Old 10-13-2018, 08:32 AM   #10
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I'll give it a try as soon as it gets light! I sure hope it's that simple.
Thanks
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Old 10-13-2018, 08:52 AM   #11
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Dont sweat leaks, sweat gushers.
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Old 10-13-2018, 09:05 AM   #12
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Do not over tighten or you can distort the cover. If it still leaks after, remove the cover and take a 2 or so metal straight edge and lay it on the inside lip where the the gasket goes. Check to see if its flat. It can be straitened out if its not. I think the torque valves for the cover are 12-18 lb ft.
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Old 10-13-2018, 09:19 AM   #13
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One trouble I have noticed is the cork gasket hardens pretty fast...read some place it is a one time use gasket...so torque values might have to be "adjusted" to get all the screws tight and thd whole gasket to seal.

I may switch over to a home made neoprene (or similat to meet chemical and temperature nedds) gasket.
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Old 10-13-2018, 12:17 PM   #14
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If the valve cover gasket is leaking a trick car builders used was small pieces of 1/4" thick flat steel to spread the load. Often the valve cover sheet metal would deform under the screw heads. THe screw was tight but the deformity would bottom out before the metal between screw heads would snug down.

If there is room on the flange to make such they might help where the gaskets are not quite doing the job.
Of course don't over tighten or you may deform the cover flange regardless.

It will depend upon your unit if there is room on the flange.


And yes you might need to get down there while running to inspect to find the leak. When the engine is hot the oil will be hot and run very readily dripping from points that leave little trace. That UV dye mentioned can help as even a small trace will show under the UV/blacklight.

Just be carefull and wear GOOD hearing protection if you do enter while running.

Any oil hoses in the area? If so a pinhole or a loose fitting or clamp, even a tiny one, can cause a stream under pressure that can spread oil.
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Old 10-13-2018, 05:16 PM   #15
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I went down in the engine room after reading this and found every bolt on both engines loose.
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Old 10-13-2018, 05:24 PM   #16
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Quote:
Originally Posted by Russell Clifton View Post
I went down in the engine room after reading this and found every bolt on both engines loose.
Would you please clarify this? Every valve cover bolt or EVERY bolt?
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Old 10-13-2018, 06:21 PM   #17
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Sorry... Every valve cover bolt.
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Old 10-13-2018, 06:26 PM   #18
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Here are some pics of what C-electric was talking about. These are for Chevys but Id think theyd be some for Fords.
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Old 10-13-2018, 06:32 PM   #19
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Quote:
Originally Posted by Russell Clifton View Post
Sorry... Every valve cover bolt.
Thanks! Gonna check mine this afternoon.
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Old 10-13-2018, 06:47 PM   #20
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Just remember that stamped sheet metal valve covers like the type on the Lehmans should not be tightened too tight or the sheet metal will distort and they can actually leak worse.

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