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1941?9N FORD/COMPRESSION CHECK

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DAVID MARTIN

03-09-2003 11:59:11




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HEY GUYS I'M A SHADE TREE MECHANIC,ON CARS AND
TRUCKS.I KNOW VERY LITTLE ABOUT TRACTORS.I JUST
PURCHASED MY FIRST TRACTOR,I THINK ITS A 9N BY
THE NUMBERS ON THE ENGINE BLOCK,I BOUGHT IT AS-
IS,THE GUY TOLD ME THE POINTS MAY BE BAD HE RAN
IT JULY 2002.INDEED THE POINTS,RESISTOR BLOCK,
AND COIL WERE BAD,I REPLACED THEM.
MY QUESTION IS,HOW DO YOU PROPERLY DO A COMPRESSION CHECK,ON A TRACTOR? I OPENED THE
CHOKE,AND THROTTLE FULLY REMOVED THE PLUGS ONE
AT A TIME,AND CRANKED IT OVER WITH MY THUMB OVER
THE SPARK PLUG OPENING.I FELT VERY LITTLE AIR
PRESSURE.I'M VERRY CONCERNED ABOUT THIS,HAVE I
DONE SOMETHING WRONG,OR IS THIS NORMAL FOR THIS
ENGINE. CONFUSED....PLEASE HELP ME OUT,THANKS

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Salmoneye

03-09-2003 15:31:18




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 Re: 1941?9N FORD/COMPRESSION CHECK in reply to DAVID MARTIN, 03-09-2003 11:59:11  
Dollars to doughnuts...

Your valves are stuck 'up'...

If this is what you find to be the case...See the link for how to fix it...



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Bill C

03-10-2003 05:12:10




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 Re: Re: 1941?9N FORD/COMPRESSION CHECK in reply to Salmoneye, 03-09-2003 15:31:18  
This is what I did, I bought my 49 8n 1500.00 two three years ago. Backfired wouldn't run, took the tank off and pulled the plugs looked in the plug holes with a light and turned it over by hand. saw (no compression) three valves not moving.sprayed wd-40 on the three valve stems(you can see them with the hood off)took a small screwdriver and small hammer tapped on top of each valve lightly till valve moved down(making sure it was on top dead center of each cyl) freed each one of them. Changed oil and filter, added one quart of keresone in place of one quart of oil(that is only 20% cut). Only ran the engine to warm, no load on it,several times until I took it out to the property after painting it and new tires ect. Change oil after 10 hrs and have had it on MMO Valvoline 10/30 now on three years, lowest cyl compression is 95 one cyl. oil press 65 cold and 25 after running it all day. Mine may be a special case but it is easier the removing the side vlave cover and head. If these tractors sit for very long without running them moisture will inter the open valve thru exhaust or intake and form light rust on the steam of the valve. Causing sticking valves, just keep them runing and ENJOY the little red belly. I DO MINE!

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Dell (WA)

03-09-2003 12:24:09




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 Re: 1941?9N FORD/COMPRESSION CHECK in reply to DAVID MARTIN, 03-09-2003 11:59:11  
DAVID..... ..you really don't have to SHOUT. Thank you. I always remove all the sparkies before I do a compression test, the engine cranks eazier.

Ford compression specs: 90 psi min.

Do a dry, 5 puff min, writter down, the a wet (squirt of oil in sparkie) writter down. (I gotts CRS) If'n compression increased more than 20 psi, ya gotts a tired engine or sticky rings. No increase sticky valves or blown head gasket.

Not uncommon for old engines to have sticky rings and sticky intake valves. I like to use Marvel Mystery Oil (MMO) as solvent to unstick rings. Pour a little into each sparkie hole. Comeback the next day (all the MMO will have leaked down past the rings) and do another compression test. If compression improved, giv'em 'nutther shot of MMO and comback next day and check compression again. 2-days of "treatment" oughtta be as good as its gonna gett.

I'd install new sparkies hotter Autolite AL-437 recommended over colder OEM Champion H-10. Always check the gap (0.025) right outta the box.

Heres the deal, modern no-lead gasoline can foul sparkies and you can't see it but your sparkies can. Drain and refuel your old gasoline, its got stuff that turns into varnish and cloggs yer carb jets. Check your fuel bowl screen and yer carb elbow filter too.

And NO, your N-Engine doesn't need lead additives, its got hardened valve seats already. And besides there's no lead in additives ennnyways, EPA ya know.

Now see if you can get your engine to start with ether quickstart..... ....Dell

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Dell, how do you know the guy is shouting? I thought you flunked mindreading???

03-09-2003 13:08:32




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 Re: Re: 1941?9N FORD/COMPRESSION CHECK in reply to Dell (WA), 03-09-2003 12:24:09  
Geessee, cut the guy a break. Just cause he leaves his cap lock button on doesn't mean he's shouting. The guy is just trying to acquire some info which you gave. But you didn't have to be a smart a$$ about it.

Bob



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bg

03-09-2003 17:05:18




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 Re: Re: Re: 1941?9N FORD/COMPRESSION CHECK in reply to Dell, how do you know the guy is shouting? I thought you flunked mindreading???, 03-09-2003 13:08:32  
That's an awfully pointed statement from someone who uses an insulting fake email address from a proxy server.



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Charles(Mo)

03-09-2003 13:51:40




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 Re: Re: Re: 1941?9N FORD/COMPRESSION CHECK in reply to Dell, how do you know the guy is shouting? I thought you flunked mindreading???, 03-09-2003 13:08:32  
Bob,
When you write in all caps, it means that you are shouting.

hth
Charles



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David Martin

03-09-2003 18:16:52




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 Re: Re: Re: Re: 1941?9N FORD/COMPRESSION CHECK in reply to Charles(Mo), 03-09-2003 13:51:40  
hey guys i didnt mean to offend anyone,i just
have a habit of leaving the caps,LOCKED or unlocked.THANKS FOR YOUR HELP.



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Jim Cox (SW Missouri 9N)

03-09-2003 19:00:17




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 Re: Re: Re: Re: Re: 1941?9N FORD/COMPRESSION CHECK in reply to David Martin, 03-09-2003 18:16:52  
I was once told by the Gen Mgr at work about my all caps emails, so I don't EVER DO IT AGAIN! (hahahaha) i enjoy all of dell's posts, his insight, his humor (don't ask....mind readin'....etc) and thank YOU for asking a question that will eventually help me someday.

(I think bob has PMS!) either that or he's a 'tinkerbell' for not having enought backbone to post an email (tinkerbell is the 'safe' word we use at work for guys the opposite of men, kinda like girls that shop at 'house of flannel'

Jim Cox
real name real location real email real grateful for helpful questions and posts

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