Author Topic: Torque Setting.  (Read 4682 times)

Mike Heagney

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Torque Setting.
« on: January 11, 2005, 19:50:11 »
Thanks for your reply on the licence lenses Bob.
Can someone advise the torque setting for the socket head screws which hold the alloy crank case to the bottm of the block ?
The workshop manual is not telling me !
Thanks,
Mike.
 64 230 SL. rhd auto....in boxes.

Ben

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Re: Torque Setting.
« Reply #1 on: January 12, 2005, 04:03:20 »
I never found a reading for this either and i suspect its one of those things you do by feel. It's probably in the same region as a spark plug, nipped up but not forced.

The more experience guys here will probably either correct me or chime in later. As far as I recall there is no gasket here and a sealant is used so there isn't much to squeeze !

Regards,
Ben in Ireland.
'64 230SL 4sp.

Jonny B

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Re: Torque Setting.
« Reply #2 on: January 12, 2005, 06:39:16 »
I will check the data manual and see if there is anything listed in there. It is at home, so it will take a day or so to get the information posted (if there is any)

Jonny B
1967 250SL Auto
Jonny B
1967 250 SL Auto, DB 568
1970 280 SL Auto, DB 904
1966 Morris Mini Minor

Naj ✝︎

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Re: Torque Setting.
« Reply #3 on: January 12, 2005, 16:27:15 »
Hello Mike,
230SL book says 'Fastening Bolts for oil pan sheet metal sump' 0.8 mkp.
Oil pan to crankcase not mentioned as you found.

280 book says 'Fastening Bolts for oil pan sheet metal sump' 1.0 mkp
Fastening bolts oil pan to crankcase 1.3 mkp.

Hope this helps.
naj

65 230SL
68 280SL

p.s: I make 1 mkp = 7.35 ft.lbs (3.2808 feet/meter X 2.24 lb/kg)
« Last Edit: January 14, 2005, 07:14:45 by naj »
68 280SL

A Dalton

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Re: Torque Setting.
« Reply #4 on: January 12, 2005, 17:01:06 »
My info shows 8.6 ft/lbs-103 in/lbs

 1 mkp = 7.233 ft/lb
 A spark plug would be 3 times as much..

Benz Dr.

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Re: Torque Setting.
« Reply #5 on: January 12, 2005, 23:09:03 »
I tighten them well and use all new hardware - always. These are socket screw so they're grade 5 in hardness. Ordinary screws are grade 3 I think. I had to remove 3 broken ones yesterday in a 220SE ( early ) engine and you can hardly drill them out. Took about an hour of careful work to get them out and not damage this very rare block. I always use a tap to chase the treads before I even start to asemble.
I use copper silicone as my sealant of choice - use can use this on exhaust pipes. THE SURFACES HAVE TO BE REALLY CLEAN with no oil or rust on them. I run a file over the surface and make sure there's no burrs or anything. I then use an angle grinder and a pad with small fingers to clean the metal. The rear seal has to be cut right and the front one should be placed on before you fit the pan.


Daniel G Caron
1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
Dan Caron's SL Barn

1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1988 560SEC

Jonny B

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Re: Torque Setting.
« Reply #6 on: January 13, 2005, 11:09:40 »
I checked the data book (Aug 1969)

"Mounting screws for intermediate flange at cylinder crankcase"
5 mkp (kilo pound meters) X 7.233 to convert to foot pounds.



Jonny B
1967 250SL Auto
Jonny B
1967 250 SL Auto, DB 568
1970 280 SL Auto, DB 904
1966 Morris Mini Minor

Benz Dr.

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Re: Torque Setting.
« Reply #7 on: January 13, 2005, 11:52:24 »
I don't think that's right - in fact I know it's not. The numbers are right for the flange but this is the piece at the back of the block that sits between the bell housing and the engine. If you tightened those little screws to 36 ft lbs they's all snap off.
The oil pan screws are only 6mm screws. The other 2 at the front and back are 8mm so they could take a bit more twisting. When they get tight they stop and then continue to turn a bit as they pull a little. This when you stop turning.
This definatly a '' feel '' thing and if you break one off you find out quickly what that feels like too. Hold the ratchet close to the head so you lower the amount of tourqe you apply.

Daniel G Caron
1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
Dan Caron's SL Barn

1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1988 560SEC

Jonny B

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Re: Torque Setting.
« Reply #8 on: January 14, 2005, 06:48:52 »
Benz Dr. thanks for the clarification. I did double check the data manual last night, and there is no other listing for the engine crankcase screws.

I re-checked the verbiage I had in quotes, and that was correct (from the data manual that is)and it was the same setting for the whole range of cars in the period of the 60's.

Proving once again the power of having many eyes looking at the information.

Jonny B
1967 250SL Auto
Jonny B
1967 250 SL Auto, DB 568
1970 280 SL Auto, DB 904
1966 Morris Mini Minor