Rear Main Oil Seal Removal ~

[wecm31]

how do you block crank

I took a spare 6 mm allen key, cut about an inch of it off. That piece of basically hex bar stock I then mounted in a wooden plug, half the length of a wine cork say.

With the engine front cover off (remove neg batt lead first), the 6 mm bar stock fits into the alternator bolt (which is crank mounted) and then I bolt the cover back on. You want to ensure the overall "tool" length is such that the cover is jammed against it, thusly holding the crank from coming forward. My cover has about a 1/4 inch gap when it's snugged up with the tool in place.

Have heard of the rag stuffing....I'd be afraid things still might move. I got to see these mystical thrust bearings and the pins they hang on inside a cutaway engine at Super Tech. You really don't want that puppy popping off. The crank has to be restrained from moving forward even 1/4 inch.

[20774]

how do you block crank

Snowbum has a description on this page, #8 about 2/3 the way down:

http://bmwmotorcycletech.info/tools.htm

[lmo1131]

Northwoods Airheads offers this, with the declaration that you can make your own.

Crankshaft Blocking Bolt

This is a small nylon bolt that I've cut to length and modified the
end. Jammed into your rotor mounting allen bolt head and with
the generator cover put back on and snugged up it will block
your crankshaft when you remove the flywheel and clutch etc.
The generator cover bolts will not be able to be tightened all the
way up and that's the idea the pressure is on the crank. You can
jury rig something like this yourself. Like many of my tools this
is a convenience to save you time and head scratching


$4.00 + $4.00 postage

Disclaimer: I have no affiliation with NWA.

[85K100LT]

OK - another question:

Where do you get the special tool?? BMW part #??





Just kidding!!!