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Ford 9N, 2N & 8N Discussion Forum
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Results from Comp. test...Now i'm confused

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RBCanada

06-01-2005 11:20:15




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Following up from my Rebuild? post here are the results of my 8n compression test first the dry run, after I ran the tractor up to my house from the rear yard. Cylinders 4-1 78,70,80,100 psi my guess is some oil has worked its way up the rings after I started the tractor. Added 1 oz of oil in each cylinder, results 4-1 102,98,102,140 psi. My guage is brand new just bought to do this test. Can anyone shed some light as to where I could be getting all this crankcase blowby and oil smoke and dripping oil from the crankcase breather??

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Dennis Williams

06-04-2005 05:06:45




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 Re: Results from Comp. test...Now i'm confused in reply to RBCanada, 06-01-2005 11:20:15  
It sounds like your rings have not seated in all the cylinders. Put some more hours on it and then recheck the compression. If it is still low you can do a leakage test, which is where you put air in the cyl's to find out where your leaking air .



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Kenneth TX

06-01-2005 13:57:09




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 Re: Results from Comp. test...Now i'm confused in reply to RBCanada, 06-01-2005 11:20:15  
RB I think this one is going to have to come back apart. You either have some serious clearance issues with piston/wall or ring end gaps. Sleaves must be cross hatched honed or rings will not seat in properly. As was mentioned pistons should have been properly clearanced to the sleaves after they were installed. Since you are using all new parts everything should have been tight and rings would have seated in pretty quickly if sleaves were honed properly. Your machinist should be able to access the problem wiht engine apart.

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RBCanada

06-01-2005 13:00:05




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 Re: Results from Comp. test...Now i'm confused in reply to RBCanada, 06-01-2005 11:20:15  
Thanks for all your inputs, I should have cleared up the fact of this NOT a fresh rebuild. I"ve had this tractor for about 10 yrs still runs great but I was getting sick of being a human PVC valve from the tractor seat. I was not sure on the reason for the two types of compression testing and why, but you cleared that up for me. I guess it"ll be time to rip here down at the end of July or August, as soon as the grass stops growing. Thanks Again. Ron.

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Rob

06-01-2005 12:08:54




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 Re: Results from Comp. test...Now i'm confused in reply to RBCanada, 06-01-2005 11:20:15  
I missed the opening about this being a rebuilt engine. Caught that reading meatman.
"Rebuild" can mean a lot of things. As it is, you could sure wait to break in the engine some. Get some hours on her and check the compression again and hope for real improvement.
If a machine shop fitted the pistons then give them a call because they just might want to proceed another way.
Seem to remember you got this from a shop. Typically, a machine shop would include fitting the pistons to the sleeve/cylinder in the cost of installing the sleeves. Especially if they provided parts. But you say you assembled the pistons. Did you properly fit the pistons and rings to each cylinder? If not, you may want to get back in there and do it even if you need to replace the rings.
Did you use plasti-gage on the rods and mains before you assembled the crank?

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Dan

06-01-2005 11:54:18




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 Re: Results from Comp. test...Now i'm confused in reply to RBCanada, 06-01-2005 11:20:15  
Are you saying this is the compression reading after a rebuild, or did you want to know if the compression reading qualified as a rebuild candidate? If these numbers are after a rebuild I would be concerned about the ring sealing issue. If you haven't rebuilt the engine yet - now is a great time to start saving up for one. You are getting oil leaking out the filler pipe due to the compression slipping past the worn rings that are not sealing and into the oil pan.

Good luck,
Dan

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Drmeatman

06-01-2005 11:51:36




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 Re: Results from Comp. test...Now i'm confused in reply to RBCanada, 06-01-2005 11:20:15  
RB, seems you've posted a day or so ago about this problem so I guess your getting sick of it? Know the feeling ! Don't know when the rebuild was (hr. running time on engine)but it takes awhile for breakin and these engines smoke just about everywhere after a rebuild.Mine still smokes from exhuste,about 6hr.on engine.Many suggest after a short running time for,,,, wondering when or if it will blow up, to attach something to "maker work" hard to make things SET. Once this is done things might clear up.Mine is for show so I don't want to getter dirty course most smoke has cleared.When you did the comp. test did you open the throtle and go 5puffs or till the tester leveled out? After rebuild did you (I know you did)connect breather to carb before you took it down the "dirty" road? It's my guess all things haven't seated ! If you have OIL pressure hook it to a big tractor, lock the breaks down on big tractor and pull it a LOOOONG way. Long post, wow.And I don't know if I helped !

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Rob

06-01-2005 11:41:20




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 Re: Results from Comp. test...Now i'm confused in reply to RBCanada, 06-01-2005 11:20:15  
A new breather cap, or at least a new element, will probably stop some or all of that dripping oil out the breather cap.



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souNdguy

06-01-2005 11:29:36




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 Re: Results from Comp. test...Now i'm confused in reply to RBCanada, 06-01-2005 11:20:15  
Worn rings/jugs.. that's where your compression is going.. that's why your breather is blowing oil... You have the 30+ psi 'classic' worn out tractor situation. Won't hurt nothing but just smokes and fouls and burns / leaks oil.

If the comp #'s hadn't moved much.. would have pointed to valves.

Time for a rebuild when you feel like gettin' yer hands dirty.

Soundguy



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Drmeatman

06-01-2005 11:56:20




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  Hey SounDguy ! in reply to souNdguy, 06-01-2005 11:29:36  
This is on a "rebuild".Course it's a classic picture for a rebuild gone wrong too.Hope not.



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