Tach oil seal

Can anyone explain the steps for changing the tach oil seal?

I thought all I had to do was unscrew the knurled nut and pop it out but the old seal is in there good and does not want to come out.

Thanks.

After you unhook the cable, unbolt the connector from the head and pull it out. Makes changing the seal much easier plus you can inspect the o-ring that seals it to the head.

mine was stuck in there really good, had to use a slide hammer to pull it out.
gonna make a blank out of a spare bit of alloy, then put a new o ring on it.

Thanks guys. I came to the conclusion that I had to take the fitting off the head.

Running to the hardware store for a larger socket. Anyone know the size of that nut? Looked like a 20 or 21mm.

Also z1 was out of the o-rings. Maybe I can get that at the store too. I think it's a 10mm o-ring. Is that right?

The old seal may be encrusted, hardened and almost petrified down inside the tach drive housing, requiring careful removal by picking it out in tiny chunks. Be certain to get all of the old seal removed, so the new seal can properly seat in its intended position.

The seal is a small circular rubber ring affair with a tiny coiled spring around it.
The seal is inexpensive, and is available at Z1 Enterprises.

A dental pick or similar tool is handy to scratch out the remains.

Click > www.z1enterprises.com/detail.aspx?ID=1469

A good light and magnifying glass is also helpful.

A properly functioning and sealed tach drive should not leak whatever, even without the tach cable attached.

Good Fortune!

rcarver wrote: Can anyone explain the steps for changing the tach oil seal? I thought all I had to do was unscrew the knurled nut and pop it out but the old seal is in there good and does not want to come out. Thanks.

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Good Fortune!

Thanks Paton,
I have the new seal and I've been digging out the old one with a sharp knife. But I was afraid I wouldn't be able to get all the little pieces. Not to mention I don't see that little retaining spring anywhere on the original.

Thought maybe I would have to take the connector off and get it from the backside.

When I fit the new one does the small spring face the front or rear tire ?

okay so how about changing the entire tach cable, how would one do that?

Oh yeah. It's a 1979 KZ650 SR.

On an iPhone will update profile asap.

thanks guys, I did not realize that the connection to the head just pulls out once you remove the retaining clip.

So I pulled the aluminum connection/seal housing off the head, removed the old seal, and cleaned it out real good.

Now it is time for reassembly. Do I just stick the worm gear in the head? Or is there a particular alignment trick I need to know. It appears to align itself but just wanted to double check.

Oh yeah, Patton good call on the dental picks, really came in handy.

it aligns itself easy

Hey guys my 1979 kz750B4 tach. oil seal was in pieces bought a new one but which way does it go back in my repair book didn't help!! so if you guys could help ?