Leaking Starter/Plunger Seal?

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Leaking Starter/Plunger Seal?

Postby reecewallace » Thu May 13, 2021 10:38 pm

Hi all,

The plunger assembly under my Delco starter seems to be leaking. My mechanic said I need a new seal, however, we can't find it in the parts book.

Does anyone know a part number, have information, or know where I can find this? It's pissing oil all over my engine compartment.
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Re: Leaking Starter/Plunger Seal?

Postby IA DPE » Fri May 14, 2021 1:23 am

Use the search function and you'll find multiple threads on this topic.

Best of luck. I chased my leak for several weeks.
1955 C170B N2993D s/n 26936
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Re: Leaking Starter/Plunger Seal?

Postby GAHorn » Fri May 14, 2021 12:59 pm

National Seal Part number: 5324-S

The OEM part is a Delco-Remy sea PN 1910379l, available from Fresno Air Parts for $5.79 (shipping will likely be more than that): https://www.fresnoairpartsco.com/produc ... er-clutch/

Meanwhile, you might wish to visit the Mx Library and read Dave Sburs’ article on replacing that seal: viewtopic.php?f=39&t=14320
'53 B-model N146YS SN:25713
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Re: Leaking Starter/Plunger Seal?

Postby cessna170bdriver » Fri May 14, 2021 2:08 pm

That leak was the main reason I switched to a lightweight starter. With wear on the plunger, even a new seal didn’t help.
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