230SL Oil pan and rear main seal issue. Getting desperate. - Mercedes-Benz Forum

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post #1 of 6 (permalink) Old 03-24-2015, 04:06 PM Thread Starter
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230SL Oil pan and rear main seal issue. Getting desperate.

Hi Group,

I am rebuilding the engine for a 1963 230SL and I have hit a wall on the rear seal.

The groove in the oil pan that the rear crankshaft seal rests in is too narrow and does not match the block. The MB rope-type rear seal fits great in the block, but the groove in the pan only measures .224" (about 5.7mm.) It is not nearly as wide or as deep as the one in the block. I know this engine has lost a rod before because the rods are not from a 230SL and I then suspect that when it failed the pan got ventilated and replaced.

Where could this pan be from? When I look for rear seal part numbers for all sorts of this-era car, they all come up with the same part number that I have, and it is only half right. The seal I need for the pan measures smaller.

Thanks for any help or guidance.

Last edited by tkarttrev; 03-24-2015 at 04:06 PM. Reason: sp
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post #2 of 6 (permalink) Old 03-24-2015, 06:03 PM
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Not sure where the pan came from but we used to put seal on it's side and push it down with a socket (like rolling pin). Tapping with hammer works also. That will make the seal thinner to fit in groove. Then after installing in pan push into groove with socket to make seal fat again. Don't forget to trim it long on ends so it will push in tighter when pan is tightened

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post #3 of 6 (permalink) Old 03-25-2015, 06:22 AM
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Great advice above.

Further help try sl113.org or call the MB Classic Center, they my have the correct oil pan. (if your is indeed incorrect)
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post #4 of 6 (permalink) Old 03-25-2015, 07:35 AM
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i may be wrong there , but the early MB engines used a thin rope , some 2 thin ropes in 2 separate grooves . the 0019971241fit almost all , size 78x94x8 mm . now there is a 000 997 90 41 , this must be for the early engines , no size listed or model , just say 6 cyl .
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post #5 of 6 (permalink) Old 03-25-2015, 05:57 PM Thread Starter
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Thank you all for the help, I think we are getting somewhere. I definitely cannot use the seal that fits the block, it is way too big and I have gone through several seals trying to see if they could be stretched, compressed, rolled etc but it won't even come close to fitting.

This same seal fit great up into the block, it was the 0019971241 part number, and that looks like the part number I find for most models. I am interested in this other part number you mentioned because there is no doubt it is a 6 and that the groove in the pan is not 8mm.

I appreciate all the advice, and there is a BenzDR on the sl113.org who is a great help as well.

***I just looked up that seal and it is a 6mm seal which might just be it. I have one coming. Fingers crossed****

Last edited by tkarttrev; 03-25-2015 at 06:03 PM. Reason: New good news
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post #6 of 6 (permalink) Old 04-26-2015, 11:11 AM Thread Starter
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I found it, it was from a Unimog pan of all places. Thank you for the help.
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