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Ford 9N, 2N & 8N Discussion Forum
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Need advice on how to proceed

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Anvilheadtexas

12-03-2007 10:18:07




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My project 8N (front mount/6v) is calling my attention. Many posts ago I reported significant blow-by and weak compression in cylinder 1 (2,3,4 were all significantly higher). I purchased the tractor "as is" and not running and I was told it sat for many years in a barn before. Input from you suggested bad rings. Now with the tractor stripped down (I have not taken the head off, but the wiring harness, radiator distributor, metal, carb, etc are off), is there anything I should do prior to replacing the rings ie: how can I verify it is not a stuck valve or a blown head gasket or something a whole lot easier to fix Also, how does one go about checking compression on a stripped down tractor? Go easy on me...I am still new to all this. A year or so ago I could not tell you what a carb on a tractor (or anything else for that matter) looked like.

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Anvilheadtexas

12-03-2007 11:52:20




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 Re: Need advice on how to proceed in reply to Anvilheadtexas, 12-03-2007 10:18:07  
OK - I was just verifying and I am now convinced it is rings...the psi on 2,3,4 were about 90ish and the psi on 1 was 45ish. This was both wet and dry. How difficult is a ring job for a newbie? Do I have to replace the sleeves as well as the rings. I have not heard anything in the engine that would indicate the rings scarred up the sleeves. Again, any advice is appreciated.



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Danny in CO

12-03-2007 12:50:17




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 Re: Need advice on how to proceed in reply to Anvilheadtexas, 12-03-2007 11:52:20  
Anvilhead,

I agree with sounder. If you do a dry and then wet compression test correctly, you will know (with a high confidence) what is wrong. Adding oil to the cylinder helps seal the rings. If the compression comes up significantly in the wet test, the problem is rings. The the compression does not come up, that indicates valves.

Good luck,
Danny



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soundguy

12-03-2007 12:32:22




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 Re: Need advice on how to proceed in reply to Anvilheadtexas, 12-03-2007 11:52:20  
45 for #1, both wet and dry? Wet test SHOULD HAVE HELPED psi if it was rings. Sounds more like valves to me... ( you didn't happen to actually read any of my post did ya... the one where I told ya how to do the test.. and what the numbers meant??? )

I'd keep testin.. till i was SURE I knew what the problem was.. unless I wanted to go back in and do the valves after i was done with the ring job. Who knows.. you might get lucky and be able to re-use the head gasket after the ring job... that will save ya 20$ right there when you go back in after the valves!

( sounds like none of your numbers came up from dry to wet... that REALLY sounds like valves to me... )

Soundguy

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Anvilheadtexas

12-03-2007 12:48:40




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 Re: Need advice on how to proceed in reply to soundguy, 12-03-2007 12:32:22  
Let's say I misread it. But going back and carefully reading it it suggests further investigations are needed. I did the comp test several months ago and I do recall that wet or dry, there were no significant changes. I will go "off-line" with some more questions to you later this evening.



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soundguy

12-03-2007 12:52:37




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 Re: Need advice on how to proceed in reply to Anvilheadtexas, 12-03-2007 12:48:40  
If the comp test, like yours, told me it was leaning toward valves.. then I'd pul the valve covers and see the valves move. might do a leakdown test as well.. dunno..

Soundguy



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soundguy

12-03-2007 11:02:22




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 Re: Need advice on how to proceed in reply to Anvilheadtexas, 12-03-2007 10:18:07  
Compression test should tell you if it is a valve or rings.. dry then wet.

You need a battery and starter to do the comp test. Should have all the internals together and pan on and filled with oil.

remove all spark plugs, open throttle to max, turn gas off, and ignition off.

put tester into hole, and then crank over... I like to crank till the gauge stops going up.. jot down # and move to next cyl. next, add a tablespoon oil to each cyl and do test again.

#'s that come up significantl;y from dry to wet are indicative of bad rings.. #'s that don't come up much.. but are low.. are indicative of valves or if near -0- really bad head gasket, once you visually verify valves is moving.. etc.

Soundguy

Soundguy

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JMOR

12-03-2007 10:57:43




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 Re: Need advice on how to proceed in reply to Anvilheadtexas, 12-03-2007 10:18:07  
Blow by certainly points to rings. To do compression test you need starter to turn over engine, and it would have been nice to do it with a warm engine.

Can obtain similar, but more info with leak down test, but more involved, & more eqmt.
Can obtain some indication of valves vs rings vs head gasket by putting compressed air into spark plug hole and listening for escape into crankcase, radiator, intake, exhaust.

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