Limited video instructions.You must pull the transmission. That procedures is NOT COVERED in the included video
This is a must-do anytime you have the transmission out of one of these cars, and you know it has not been done in the past 10 years. Of course, if you are leaking engine oil out of the bellhousing after a long drive, then you should also replace it.
M103 and M104 Engine Rear Crank Seal Replacement Kit
$46.85
SKU:
GEG-M103RSEALKIT 
Product Details
The kit contains the following"
New high-quality seal
Lip cup to allow for easy installaton over the crank
Small modified punch for removing the old seal
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On Demand Video
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How to Fix a Leaking M103 Camshaft Front Seal - On Demand Video
A leaking cam seal can foul your distributor cap, causing your engine to misfire. Check your cam seal BEFORE replacing you distributor cap and rotor.
In this 12-minute repair video Kent will show you how to
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M103 6 Cylinder Gas Engine Fuel Injector Holder Rubber Seals
For all single camshaft 6 cylinder 260E, 300E, 300TE, 300CE , 190E 2.6, and the W126 300SE and 300SEL from 1986 to 1992
For these old 6 cylinder gas engines of the late 80's and early 90's Kent feels this part along with the injector o-ring seals could be one of the most overlooked maintenance items on these engines.