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09-22-2021, 02:43 PM | #1 |
Senior Member
Join Date: Dec 2013
Location: Hershey, Pa.
Posts: 102
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compression test
I would like to do a compression test on my '30 Model A. I didn't buy the gauge yet but I also know i will need an adapter to thread in to the spark plug holes. Can anyone tell me what size and where can I find it? Jim
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09-22-2021, 03:06 PM | #2 |
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Join Date: Apr 2021
Location: Central Illinois
Posts: 490
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Re: compression test
The vendors have them. 7/8-18 thread.
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09-22-2021, 03:07 PM | #3 |
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Join Date: Jan 2012
Location: Western North Carolina
Posts: 3,899
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Re: compression test
Vendors sell 14mm spark pug adapters. At Snyders the part number is A-12405-ADP and the price is $6.75.
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09-22-2021, 04:29 PM | #4 |
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Join Date: May 2010
Location: Largo Florida
Posts: 7,225
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Re: compression test
They still sell the handhelds which have a tapered rubber cone. Just hold it in the hole, crank away and watch the needle. They work just fine for our old easy to get at monsters.
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09-22-2021, 05:06 PM | #5 |
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Join Date: Apr 2018
Location: Mebane NC
Posts: 2,350
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Re: compression test
AutoZone will lend you a compression tester at no charge under their loan-a-tool program, so you only need to buy the adapter. Remember to set the throttle fully open.
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09-23-2021, 08:05 AM | #6 |
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Join Date: Dec 2020
Location: Central Wisconsin
Posts: 105
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Re: compression test
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09-23-2021, 08:09 AM | #7 | |
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Join Date: May 2010
Location: Largo Florida
Posts: 7,225
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Re: compression test
Quote:
I just push the starter rod with my hand. |
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