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Tach Drive oil seal replacement

Posted: Sun Dec 14, 2025 7:36 am
by CHARGER
Hi All,

Wondering what i'm missing with the Tach Drive assembly.

I am wanting to replace oil seal #25 shown in the diagram.

I have removed the worm gear/shaft that engages with the output shaft to the tach cable however this tach cable output shaft will not pull out along with the seal #25 on top of it. I see no retaining clip etc and assume it should just pull straight out, I've tried with needle nose vice grips to pull it out but it doesn't budge

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Re: Tach Drive oil seal replacement

Posted: Mon Dec 15, 2025 6:56 pm
by donnybach
Is machine screw/ bolt 26 retaining the gear?

Re: Tach Drive oil seal replacement

Posted: Tue Dec 16, 2025 2:51 am
by CHARGER
No, it's removed, strange. Looks like I got away with just replacing the orings and i think it's sealing, see how it goes on a ride. Would have liked to have replaced that seal tho.

Re: Tach Drive oil seal replacement

Posted: Tue Dec 16, 2025 2:46 pm
by charliext1vj
I looked at doing this today for you but when I examined the drive i thought the seal was too good and felt even though if it leaked it would lubricate the drive and agree you have the O rings as back up. So if it aint broke dont fix it comes to mind :-). Good luck.

Re: Tach Drive oil seal replacement

Posted: Wed Dec 17, 2025 11:39 pm
by CHARGER
Cheers Charlie.

My seal spins with the drive, seems wrong so I wanted to change it but touch wood no more leaks so I've left it