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Ford 9N, 2N & 8N Discussion Forum
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9n compression numbers and what to do?

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Thain Cashmore

08-12-2019 07:06:43




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First of all I have been scouring the threads on compression tests and trying to figure out what I need to do for my old tractor. Lots of data and information but hard to piece it together. I have a 9n that was running fairly well but then started to miss and has no power, it was on the weak side to begin with. Figuring it was time for new points, condenser, plugs and spark Wires, I change all of these with no change in the performance. So I did a compression test and had these numbers. Dry #1 - 65, #2- 97, #3 - 87, #4 -95

wet was 75, 102, 115, 103

My question, is this indicating a valve problem on Number one and does Number 3 look like ring problems? if so what does it entail to get it fixed? Thanks for any and all help ahead of time!

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pinball

08-14-2019 15:01:30




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 Re: 9n compression numbers and what to do? in reply to Thain Cashmore, 08-12-2019 07:06:43  
if you have ring failure you should have some smoke.



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Eman85

08-13-2019 06:12:29




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 Re: 9n compression numbers and what to do? in reply to Thain Cashmore, 08-12-2019 07:06:43  
I'd say do a leakdown test then a wallet weigh. You have to decide how much you want to put into a 9N as a complete engine rebuild will get pricey.



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Thain Cashmore

08-12-2019 20:50:04




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 Re: 9n compression numbers and what to do? in reply to Thain Cashmore, 08-12-2019 07:06:43  
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Thanks for the quick responses!

So it seems the only thing to really do is start tearing it down to see what needs to be corrected. Can one rebuild the engine without removing the block? If so does one need special tools to get it done or is it easier to just remove the block and take it to a machinist?



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Hobo,NC

08-12-2019 18:21:34




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 Re: 9n compression numbers and what to do? in reply to Thain Cashmore, 08-12-2019 07:06:43  
A cylinder leakage test will locate the leakage... My bet you have valve sealing issues...
#1 cylinder will ware faster than the others because it runs cooler than the rest its getting the cooled coolant all the time blasted aging the front of #1 cylinder wall.
Anyways a compression test is used to lead you in the next test needed to find leakage if its below acceptably levels...

The latest greatest is a Pressure Waveform analysis....
https://www.picoauto.com/library/training/pressure-school-part-2-a-running-diagnosis

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TheOldHokie

08-12-2019 15:03:39




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 Re: 9n compression numbers and what to do? in reply to Thain Cashmore, 08-12-2019 07:06:43  
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You have what looks like blowby on the rings and at least one bad valve. I would expect to see signs of the blowby coming from the crankcase breather. The valve repair is the one that will give you more heartburn. It requires a seat cutter and an experienced operator. The blowby can be fixed by installing a $175 piston and liner kit.

TOH

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Leroy

08-12-2019 08:23:09




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 Re: 9n compression numbers and what to do? in reply to Thain Cashmore, 08-12-2019 07:06:43  
Could be as simple as valves needing adjusting or needing ground. Also broken valve spring. But could also be rings.



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