Author Topic: Position of the crankshaft seal  (Read 350 times)

Figoulu

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Position of the crankshaft seal
« on: August 24, 2025, 05:17:02 »
Hi gents

I was working under my car and noticed that the crankshaft seal isn’t sitting flush with the crankcase. There’s no sign of an oil leak, and I can see some sealant around it. What’s your opinion on this? (Please, only from those who really know 😁)
1965 230 SL
1991 Porsche 911/964 carrera 2

My youtube channel #lfgdf

Figoulu

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Re: Position of the crankshaft seal
« Reply #1 on: August 24, 2025, 18:39:53 »
Nobody to help me ? 😅
1965 230 SL
1991 Porsche 911/964 carrera 2

My youtube channel #lfgdf

yves

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Re: Position of the crankshaft seal
« Reply #2 on: August 24, 2025, 19:36:05 »
Sorry Francois……! I can’t help you but am on the professional answer…soon?
Happy owner of a 69 blue 280SL ,  63 FHC  osb E-type , 55 FHC XK 140 to be restored...

Figoulu

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Re: Position of the crankshaft seal
« Reply #3 on: Today at 04:48:16 »
Sorry Francois……! I can’t help you but am on the professional answer…soon?

In case you have some time to spare if you could just take a look at yours and possibly post it here, it would ba great 👍
1965 230 SL
1991 Porsche 911/964 carrera 2

My youtube channel #lfgdf

WRe

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Re: Position of the crankshaft seal
« Reply #4 on: Today at 06:28:08 »
Hi,
the sealing ring must sit flat on the engine block.  Yours has moved too far outwards . Perhaps the inner Borgmann ring has shifted outwards too.
Attached are two pictures from the German Pagoda Forum.
...WRe

Figoulu

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Re: Position of the crankshaft seal
« Reply #5 on: Today at 07:38:49 »
Hi,
the sealing ring must sit flat on the engine block.  Yours has moved too far outwards . Perhaps the inner Borgmann ring has shifted outwards too.
Attached are two pictures from the German Pagoda Forum.
...WRe

thanks  !

I noticed in the first picture that the seal doesn't appear to be 100% flush, but the angle of the photo might be a bit misleading…

If that’s really the case, I suppose it could be easily repositioned? I don’t think the seal has moved since it was installed.

I've asked the mechanic who did the work and I'm waiting for his response, but I wanted to get your advices in the meantime.
Anybody else to complete ?
1965 230 SL
1991 Porsche 911/964 carrera 2

My youtube channel #lfgdf

WRe

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Re: Position of the crankshaft seal
« Reply #6 on: Today at 07:58:40 »
In my first picture, too much additional sealant was probably used.
The "collar"/edge should fit tightly, if there is one (different parts).

su8pack1

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Re: Position of the crankshaft seal
« Reply #7 on: Today at 12:44:42 »
I just replaced mine last month.
1969 280SL
1984 300CD
1987 190E 2.6
1988 190D 2.5

Figoulu

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Re: Position of the crankshaft seal
« Reply #8 on: Today at 13:45:40 »
I just replaced mine last month.

And how was the seal against the crankcase ? Flush or not ?
1965 230 SL
1991 Porsche 911/964 carrera 2

My youtube channel #lfgdf

Benz Dr.

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Re: Position of the crankshaft seal
« Reply #9 on: Today at 15:21:52 »
Seal should be fairly even with the crankcase. Crooked seals can leak.
« Last Edit: Today at 17:05:19 by Benz Dr. »
1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
Dan Caron's SL Barn
1966 230SL 5 speed
1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1990 560SEC

Figoulu

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Re: Position of the crankshaft seal
« Reply #10 on: Today at 15:27:10 »
My mechanic said that I need to push it further so that it sits flush with the crankcase.
That means removing the radiator, fan, and belts (alternator, water pump, power steering pump...), then proceeding to remove the damper.
I guess I’ll need to replace the carnkshaft screw when putting everything back together.

Well... I’m a bit tired and now I understand why I prefer doing things by myself. At least if I’m disappointed with my work, I still save money.:D
1965 230 SL
1991 Porsche 911/964 carrera 2

My youtube channel #lfgdf

su8pack1

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Re: Position of the crankshaft seal
« Reply #11 on: Today at 16:35:44 »
This was my original before removing.
1969 280SL
1984 300CD
1987 190E 2.6
1988 190D 2.5

Figoulu

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Re: Position of the crankshaft seal
« Reply #12 on: Today at 18:59:25 »
Anybody to guide me to block the engine and remove the damper ?
Would you engage the gearbox ?
Would you put a rod thru the camshaft gear ?

1965 230 SL
1991 Porsche 911/964 carrera 2

My youtube channel #lfgdf

Benz Dr.

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Re: Position of the crankshaft seal
« Reply #13 on: Today at 21:02:36 »
I use an air impact gun. It should rip it out easily without turning the crankshaft. Then I use a 6 inch extension behind the front balance weight and use the extension to block any movement while I torque the screw down while installing. Be sure to use a bit of oil on the threads of the screw and also on the washers. Gives a much better torque down with lubrication. 
1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
Dan Caron's SL Barn
1966 230SL 5 speed
1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1990 560SEC

 

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