Fellow 170 caretakers,
I just replaced both seals in my pull starter motor (170A). As I look at it now I think I may have installed the one around the pinion gear backwards (brass colored one in the photo). I have the “cup” portion of the seal towards the motor and I’m wondering if I should have done it the other way to keep oil out of the motor. Any help is appreciated. (I’ll probably see my A&P tomorrow, but I’d like to fix it now if it is needed.)
Thanks,
Doug
Starter Seal, Did I Install Backwards?
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- dstates
- Posts: 504
- Joined: Sun Jun 30, 2019 5:50 pm
Starter Seal, Did I Install Backwards?
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N1235D - 1951 170A - SN: 20118
- GAHorn
- Posts: 21261
- Joined: Fri Apr 12, 2002 8:45 pm
Re: Starter Seal, Did I Install Backwards?
Both cups should face the engine. You want to keep oil inside the engine.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.

- dstates
- Posts: 504
- Joined: Sun Jun 30, 2019 5:50 pm
Re: Starter Seal, Did I Install Backwards?
GAHorn wrote:Both cups should face the engine. You want to keep oil inside the engine.
Yeah, that was my thought. I realized it right after I pressed it in…. Looks like Fresno Air Parts will get another order from me.
N1235D - 1951 170A - SN: 20118
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