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Old 05-16-2014, 02:16 PM   #41
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Oil Leaks on FL120

I have an oil leak from the oil pan. Several mechanics at work said that I should just tighten the bolts on the oil pan because being a cork gasket the oil pan just worked loose. Is it that simple to stop the oil pan leak? Do I need to worry about proper torque pound when snugging up the bolts?
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Old 05-16-2014, 02:33 PM   #42
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Graham,

Are you referring to the valve cover cork gasket? If you are, one thing we learned and saw was when the bolts are tightened too much it distorts the cover around the bolt area and we had to take the cover and take flat block of wood and lightly hammer the cover area flat again instead of the dome shape from over tightening. This helps get the gasket area flat again to make a good seal. Then apply a new gasket and snug down, not torque the bolts. Make sure the head and cover are clean and try not to distort the gasket by over tightening. This is how we were instructed.
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Old 05-16-2014, 03:57 PM   #43
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I was referring to the oil pan gasket. This is at the bottom of the engine. I believe it is cork also. So what you are saying is to just snug these bolts because over time they have gotten loose. There is no need for any torque wrench.
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Old 05-16-2014, 04:20 PM   #44
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Originally Posted by grahamdougladd View Post
I was referring to the oil pan gasket. This is at the bottom of the engine. I believe it is cork also. So what you are saying is to just snug these bolts because over time they have gotten loose. There is no need for any torque wrench.
I'd use a torque wrench on the oil pan. That way you'll know and won't over tighten.

I have the FL SP135 (380). My service manual (Nov. 1977) lists the torque limits in foot-lbs for 4 different Ford Dorset engines. The oil pan to cylinder block is 22-24 ft lbs and the valve (rocker arm) cover is at 12-18. I'd check your book for the correct values though.
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Old 05-16-2014, 04:59 PM   #45
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I would agree with Larry, check your engine manual for torque numbers at any engine location. I was referring to the valve cover gasket, NOT the oil pan gasket.
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Old 05-29-2014, 09:04 AM   #46
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As a new owner of twin 1984 120 Lehmans, does anybody have a service checklist of when to do what maintenance?

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Old 05-29-2014, 09:06 AM   #47
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Service manuals are all on line in PDF's
Do a Google
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Old 05-29-2014, 11:14 AM   #48
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If truly leaking from a pan gasket and not a front or real seal, I would just put a wrench on with a light tough and feel how they are, like others have stated cork gaskets are not great at over tightening or old and re-tightening. Again I would just like to give it a little feel to see if loose, if not I would leave it until you can drop the pan and replace it. Just my 2 cents.
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Old 05-29-2014, 11:44 AM   #49
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$5 it's not the pan gasket but the lift pump gasket!

Just kidding, I'm a boater and I don't have $5.
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Old 05-29-2014, 12:02 PM   #50
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Restrictive rocker cover vent and a little extra blowby can pressurize crankcase slightly, forcing leaks where they otherwise would not occur. I've solved a couple of these by enlarging vent on rocker cover.
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Old 05-29-2014, 01:04 PM   #51
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Service manuals are all on line in PDF's
Do a Google
Thanks, I have found a lot on line. There seems to be a lot of discussions where suggested time in the original manual have been superseded by 30 years of experience.

I was wondering if anyone has put together a quickie service interval sheets with some more tried-and-true numbers.
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Old 05-29-2014, 01:13 PM   #52
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Thanks, I have found a lot on line. There seems to be a lot of discussions where suggested time in the original manual have been superseded by 30 years of experience.

I was wondering if anyone has put together a quickie service interval sheets with some more tried-and-true numbers.
Even the pros will debate and disagree on some numbers...

Obviously the original manual has been rethought as things like oil improvements have been made and things like viscosity and multiweights can be thought through rather than base it on 30-50 year old tech.

All you can do is read it all and make up your own mind.

I use the "what has really changed" and what new tech procedures can update a 30-50 year old manual.

I have to think some thing are like using leeches by doctors...some will say use what the manual published in 1963 says...totally ignoring the manual that was republished in 1975...so like leeches they say...good for then...good for now. You decide...I like to think I can do better than follow antiquated thinking.
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Old 05-29-2014, 01:15 PM   #53
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I like to think I can do better than follow antiquated thinking.
My point exactly...
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Old 05-29-2014, 01:46 PM   #54
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Greetings,
"...I like to think I can do better than follow antiquated thinking." Sorry Mr p. You're wrong about the leeches. Medical Leeches | Leeches are making a comeback as medical helpers - Baltimore Sun
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Old 05-29-2014, 02:08 PM   #55
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Greetings,
"...I like to think I can do better than follow antiquated thinking." Sorry Mr p. You're wrong about the leeches. Medical Leeches | Leeches are making a comeback as medical helpers - Baltimore Sun
Please check into bleeding for me...I know it must help based on how much I lose in the engine room and never seem to get sick....
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Old 05-30-2014, 12:57 AM   #56
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Did you check your lift pump gasket???!!!
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Old 05-30-2014, 01:01 AM   #57
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Some one was looking for service intervals on a Lehman engine I found this at
Bowmac Marine http://bomacmarine.com/pdf/lehman-fo...ance-guide.pdf
Copy and paste the url
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Old 05-30-2014, 06:25 AM   #58
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When the cork gaskets shrink the first check should be with a little box wrench , the bolt will feel LOOSE and easily turn.

Snug it a bit till some resistance is felt and when the cork warms it should become pliant again and seal.

This is common on auto trannies and older cars so there is Better Living Thru Chemistry , a can of gasket expander at your local auto supply if required.
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Old 05-30-2014, 08:05 PM   #59
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Originally Posted by grahamdougladd View Post
Some one was looking for service intervals on a Lehman engine I found this at
Bowmac Marine http://bomacmarine.com/pdf/lehman-fo...ance-guide.pdf
Copy and paste the url
Perfect, thanks!
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