Topic: Compression adapter – Page 2 – Antique Outboard Motor Club,Inc

This topic has 16 replies, 12 voices, and was last updated 6 years, 10 months ago by amuller.

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February 19, 2018 at 5:27 pm #71327
The Boat House
Participant
quote chuck86:

WTB has had no response to a compression adapter for my old motors that take a 7/8 x 18mm. This is a large spark plug hole.

How do you check the compression on these motors?

chuck86
PA
doggone@velocity.net

I sent you an email on the 16th
to the email in your ad.
Did it end up in your junk mail?
February 19, 2018 at 6:05 pm #71330
Mumbles
Participant
quote BillW:

“If it’s on your mind, it’s on eBay.”

https://www.ebay.com/itm/New-18mm-Compr … SwMmBVuozg

The only problem with this adapter is it’s for a tapered seat plug opening. If necessary, it could always be adapted to a flat seat opening.

https://www.grainger.com/product/WESTWA … ter-45T010
February 19, 2018 at 6:15 pm #71331
Mumbles
Participant
quote Buccaneer:

What model Logan do you have?
Mine is a 1947 model 820 with the turret tail stock….

No Logan here. Just a bilingual offshore 12 X 36 model which speaks both metric and SAE.

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February 19, 2018 at 6:24 pm #71332
RICHARD A. WHITE
Participant
Lifetime Member
Ok, this is goofy, I typed that I had a Logan , but somehow it was placed on Bucanneers post????

http://www.richardsoutboardtools.com
classicomctools@gmail.com
February 19, 2018 at 6:35 pm #71335
Buccaneer
Participant
US Member
Richard, My Logan is 1950’s, model 1925, powermatic type, with
normal tail stock.

Prepare to be boarded!
February 19, 2018 at 8:46 pm #71347
garry-in-michigan
Participant
Lifetime Member
It worked for me . . . 🙄
February 21, 2018 at 3:40 am #71408
amuller
Participant
Brillman has adaptors. https://brillman.com/product/spark-plug … 8-to-14mm/

Not sure if Champion still carries them.

7/8" plugs are readily available and cheaper than adapters. The last small equipment to use them, that I know of, was the Gravely Convertible 2-wheel tractor, up into the 60s. An old-timey Gravely dealer will know about this stuff.
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