Excess oil in primary chaincase of Dominator 88

Hi,

Its not too big a job.

The seal is located in the crankcase outboard of the d/s main bearing but you do have to remove the alternator and crank sprocket to get to it.

For removal, I drill 2 small holes in the seal, taking great care not to let the drill hit the crank, and screw a couple of self tappers in. Then it is a "simple" task of gripping the self tappers with pliers and pulling the seal out.

After cleaning, it is a simple matter of pressing the new seal in, using a proper seal driver if you are a perfectionist, or a large box spanner if you are like most normal people.

Just make sure that the 'lip' of the seal goes properly over the crankshaft nose on its way in.

Regards,George

The slightly  awkward things you have to do is hold the transmission  to undo the nut on the crank, remove the primary chain ,pull off the alternator ,may have to find where the bullet connectors hide , pull off the sprocket ( the Commando puller is not the one you need),remove the woodruff keys, do the seal, Replace keys,sprocket and the alternator and get the clearance right. Hold the transmission to tighten the nut to the right torque, re-fit the primary chain (sometimes needs the gearbox moved forward )  .  Simples!!   Sometimes the sprocket is on solid and the best tool to remove is the pukka Dommy one. Used to be hard to find.  Not a difficult job for us old timers, but a bit of an eye openner for  someone used to just maintaining a modern bike.

Attachment shows oil seal in its crankcase housing after all the primary parts and crankshaft have been removed.  You do not need to go to this extreme. Just remove the chunks as as described by Robert above. I use a thin screwdriver to pierce and lever the seal out. Be careful when doing this so that no damage is done to the alloy lip behind the seal. Use just the tip (1/8") of the screwdriver.

Use plenty of grease when sliding the new seal over the crankshaft to avoid nicks or tears. Some people add threadlock goo to the seal to help hold it in position. This should not be necessary with a good make of seal on the likes of a 500cc or 600cc motor.