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Ford 9N, 2N & 8N Discussion Forum
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Compression tester - tough starting

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Bob - MI

12-21-2004 05:44:12




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My 2N with an 8N motor is starting to give me starting fits in the cold. I have never (Dell please forgive me)done a compression test and don"t own a tester. I am starting to think the engine ("49 8N front mount) is getting weak and won"t catch until the battery (6V) is about drained dead. I have noticed that by then the oil pump has started to develop pressure and I"m guessing the compression is probably coming up.

When I got this tractor 4 years ago it had an 8 volt battery in it and based on the archives it appears that it"s getting to be tear down time. In the interim I have resorted to 12V jumping to get it going and while that"s ok for now, it"s not the answer.

I wonder what suggestion you guys could give me on a good compression tester. Lots of cheap tools out there and I don"t want to get some junk unit that won"t do the job.

Thanks a lot

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Russ in SoCal

12-21-2004 10:04:26




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 Re: Compression tester - tough starting in reply to Bob - MI, 12-21-2004 05:44:12  
Bob,
Harbor Fright Item # 9603-0VGA $50. Looks like it has a hose and adapter for each cylinder. They had a cheaper one that worked just as well, but it must have been popular; it"s discontinued.
Russ



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Steve (Magnolia, TX)

12-21-2004 06:38:35




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 Re: Compression tester - tough starting in reply to Bob - MI, 12-21-2004 05:44:12  
I s'pose "cheap tool" would depend on your application.

Personally... I'm no mechanic. I have (limited?) some mechanical skill and like to tinker around on the ole 8N and the truck, etc., but it's not my livelyhood.

That being said... I bought my compression tester (that I've used once, on my 8N, to determine that I'd thrown the #1 rod) at Harbor Freight, for about $5 (I believe). Yes, that's five dollars.

Is it the best compression tester on the market? Heck no!!!

Did it work for me? Sure did.

HTH
Steve

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Dan

12-21-2004 06:49:17




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 Re: Compression tester - tough starting in reply to Steve (Magnolia, TX), 12-21-2004 06:38:35  
When I was working on my 48 8N at my Father-in-Laws shop, I compared the results of my $20 Harbor Freight compression tester to his very expensive calibrated one, to check the differences on a warmed up engine and freshly charged battery. I got no more than 1 psi difference between the two readings. I was very proud of my $20 investment at that point.

Good luck,
Dan



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Bruce (VA)

12-21-2004 05:54:09




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 Re: Compression tester - tough starting in reply to Bob - MI, 12-21-2004 05:44:12  
As I recall..... my compression guage cost about $50; that was the going rate mail order & at a couple of local auto parts stores a few years ago. When you get it, do yourself a big favor & get a brass 90* elbow that will screw into the head & allow you to screw the compression guage hose into the elbow. It's hard to get the hose screwed into the head underneath the gas tank. And, make sure you conduct the test on a hot engine w/ the breather removed & choke open. Five puffs, 90 lbs minimum on each cylinder & no more than 10% variance between any two cylinders. Remember Bruce's First Rule of Tools: "No tool is too expensive & no tool is uneccessary"

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Dell (WA)

12-21-2004 08:58:27




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 Re: Compression tester - Good Rule in reply to Bruce (VA), 12-21-2004 05:54:09  
Bruce..... ... Remember Bruce's First Rule of Tools: "No tool is too expensive & no tool is uneccessary" ..... .....love it, Dell



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Bruce (VA)

12-21-2004 09:55:36




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 Re: Compression tester - Good Rule in reply to Dell (WA), 12-21-2004 08:58:27  
I still have my $3 "Sneaky Pete" tool purchased in 1965 & used to replace the upper rear crank shaft rope seal in a 1947 Chevy.....never can tell when I might need to do that again!



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Russ in SoCal

12-21-2004 13:40:46




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 In case ya lose it in reply to Bruce (VA), 12-21-2004 09:55:36  
Still available



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GAJIM

12-21-2004 11:43:19




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 Re: Compression tester - Good Rule in reply to Bruce (VA), 12-21-2004 09:55:36  
Bruce: I gots a "Sneaky Pete" too! Used it to change out the upper half rear main bearin' seal on my '73 455 Buick in '98 when the original seal was 25 years old. I plan on using it again to change it out after another 25 years in 2023. :-) GA Jim



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