Author Topic: 6.9 front crank seal  (Read 1093 times)

1960mog

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6.9 front crank seal
« on: 24 May 2016, 02:17 PM »
Hi everyone

I found this radial seal that matches the dimensions of the 6.9 front crank seal.
It is double lip and the material seems to be right for the job.

Did anyone ever use a seal other then original Mercedes on a crank? Any experiences?









78 6.9 #4084
79 6.9 #6669

daantjie

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Re: 6.9 front crank seal
« Reply #1 on: 24 May 2016, 06:39 PM »
Try also posting on www.m-100.cc
There are a few guys on there who have rebuilt their 6.9 motors recently. Notably member "Randy" in Australia.
Daniel
1977 450 SEL 6.9 - Astralsilber

3l33ter

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Re: 6.9 front crank seal
« Reply #2 on: 30 May 2016, 07:13 PM »
Nice find!

Where can it be purchased?

I'm actually doing some work on my 6.9 now, I have the water pump off and doing the timing chain. How hard is it to do the front seal? I heard that crank bolt is torqued on ridiculously tight.
'75 280S
'77 6.9
'82 300TD

daantjie

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Re: 6.9 front crank seal
« Reply #3 on: 30 May 2016, 09:08 PM »
Yup like 400nm or thereabouts  :o
Daniel
1977 450 SEL 6.9 - Astralsilber

floyd111

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Re: 6.9 front crank seal
« Reply #4 on: 30 May 2016, 09:31 PM »
With SKF, you should be in good hands, though, even if they're made in China these days. Ohlins also uses many of their OEM parts and QC/tolerances are as sharp as they come.

1960mog

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Re: 6.9 front crank seal
« Reply #5 on: 31 May 2016, 10:05 PM »
Nice find!

Where can it be purchased?

I'm actually doing some work on my 6.9 now, I have the water pump off and doing the timing chain. How hard is it to do the front seal? I heard that crank bolt is torqued on ridiculously tight.


Ebay, just search for the part number.
I payed $18 incl. shipping.

You need a puller to remove the hub and a way to hold the crank while applying 400nm to the crank nut.
78 6.9 #4084
79 6.9 #6669

3l33ter

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Re: 6.9 front crank seal
« Reply #6 on: 03 June 2016, 12:50 AM »
I saw somewhere, maybe m100.cc, that a flywheel lock for a Porsche 944 works on a 6.9. I happen to be a 944 guy so I already have that tool.

But I don't think I'll bother right now. It's not leaking, and I don't want to buy a torque wrench that goes up to 400Nm.
'75 280S
'77 6.9
'82 300TD

TJ 450

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Re: 6.9 front crank seal
« Reply #7 on: 07 June 2016, 02:47 AM »
Hi all,

Yes the 944 tool does work, I've used it. A suitable torque wrench can be hired for the job, but you will find a long pipe will be required for leverage, like at least a yard/metre long!

Tim
1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500

Zaxxon

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Re: 6.9 front crank seal
« Reply #8 on: 07 June 2016, 05:48 AM »
That is good to know if I ever come into that situation, because I have a feeling the Porsche 928 tool (I have the combo flywheel lock for 16V and 32V engines) should work for the 450SEL then too...I might just have to try that some time.
---
Mercedes: '99 CL500, '86 500SEC, '96 SL500, '06 R500, '02 ML320, '78 450SEL
Porsche: '80 928S 5-Speed, '86.5 928S RogerBox '86.5 928S 5-Speed, '83 944
Others: '84 Callaway Alfa Romeo GTV6, '83 Tiara, '87 FZ