I had replaced the rear crankshaft seal, oil pump cover, bolts and oil pump cover o-ring.  I also replaced the camshaft seal as it was leaking. You can read how I did that here.

• 11 BMW R75/5 Remove-Install Flywheel, Replace Rear Main Seal, Oil Pump Cover & Cover O-Ring
• 11 BMW R75/5 Replace Cam Shaft Seal

Parts List

This is the parts list.

Part #	Description	Qty
11 14 1 337 654	Front Crankshaft Seal	1

Remove the Stator

I replaced the alternator brushes which requires removing the stator. You can read about how to remove the stator here.

• 12 BMW R75/5 Replace Alternator Brushes, Paint Starter Motor

Remove the Rotor

When I purchased the brushes from Euro Motoelectrics, I also picked up a hardened bolt to remove the alternator rotor from the crankshaft.

• R75/5 Rotor Removal Bolt

With the stator removed, the rotor is exposed.

It is secured to the crankshaft with an Allan bolt and is pressed onto the tapered nose of the crankshaft. Since my engine was out of the frame, I installed the tranmission and put it into first gear to provide some extra drag so I could loosen the alternator bolt.

Then I removed the bolt and washer.

I threaded the rotor removal bolt and had to block the rotor from turning to get the rotor to back off from the tapered crankshaft nose. I used a 1 inch steel strap carefully inserted between the steel casing avoiding contact with the coil windings.

It popped off the crankshaft exposing the front main crankshaft seal.

I had recently purchased a Lisle shaft seal puller, #584030, and used it to remove the old seal.

The hook slips beside the shaft and the extends under the shoulder of the seal.

There is an adjustable pivot bar so it can be placed on the housing and then you lever the seal out of the hole.

I heated the engine housing with a heat gun to make it easier to remove the seal. It popped out the seal in quickly.

Installing the New Front Crankshaft Seal

I used metal polish to clean the tapered nose of the crankshaft and the tapered bore in the rotor. Then I used brake cleaner to get any oil off them.

I put a little oil on the outside of the new seal and then heated the engine casing around the seal bore.

I pushed the seal into the hole evenly and used a 30 mm deep socket and a rubber mallet to tap it home.

Installing the Rotor

I put the rotor back on the crankshaft nose and threaded the alternator bolt into the rotor. I used the 1 inch metal bar to carefully brace the rotor and tightened the rotor bolt to 17 FOOT/pounds.

Installing the Stator Housing

You can see how I installed the stator housing in the write-up on replacing the alternator brushes.

• 12 BMW R75/5 Replace Alternator Brushes, Paint Starter Motor

I put the timing cover back on the engine and then polished it.  Here is the engine ready for installation in the frame.