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Ford 860 Power/compression test results

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Bob Johnston

09-02-2007 12:28:44




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I need some serious advise on what is going on with my Ford 860 tractor. I did a compression check and found out I have about 150 psi on the number 1 and 4 sylinders and only about 20 psi on the 2 and 3 cylinders. Tryed puting oil in the 2 and 3 cylinders and it didn't make any difference. Does this mean valves? Also, after I got done the tractor would start to turn over maybe a couple of turns then the starter would click but wouldn't turn the motor over. The battery is showing 12 volts. Final there is a cover below the the spark plugs that is held on by three bolts...is this for the valve lash adjustment? Need help...comfusing in Greenbush.

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john_bud

09-02-2007 19:45:20




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 Re: Ford 860 Power/compression test results in reply to Bob Johnston, 09-02-2007 12:28:44  
It does sound like a head gasket and you may be leaking coolant into the cylinders as stated.

It's not super major to pull the head, but the sheet metal does need to be removed and a fair amount of brackets and things. It can be removed, the deck surfaces cleaned and replaced with new gaskets in a day.

jb



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Bob Johnston

09-03-2007 07:04:16




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 Re: Ford 860 Power/compression test results in reply to john_bud, 09-02-2007 19:45:20  
Thanks for all of the advise. Just a couple more questions, appears the head came with either 7/16 or 1/2 head bolts (based on the parts available on the YT parts catalog), anyone know which one the 1956 Ford 860 had and can the bolts be reused and if so should they be lock tighted? Finally, are there any tricks to replacing the head gasket, anything I need to look out for or be careful of? If I don't touch the valves is it as straight forward as replacing the gasket and resetting the head? Quess I always wanted to pull the head. Thanks again for all of the help.

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john_bud

09-03-2007 09:44:17




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 Re: Ford 860 Power/compression test results in reply to Bob Johnston, 09-03-2007 07:04:16  
Yes, you can just remove replace and go. BUT, that would not be real smart. The valve lash is going to change based on the change in gasket thickness. The rocker arm shaft and supports must be removed to take off the head. Loosen each bolt a bit, then do the next, etc until all are loose. That will keep the spring pressure from bending the rocker arm shaft. Do set the valve lash to 0.015 inch clearance when hot. I rough them in at 0.018 cold, and they are almost always at 0.015 hot. Before setting the hot lash, retorque the head bolts down to the final setting.

jb

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Dean

09-03-2007 07:46:00




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 Re: Ford 860 Power/compression test results in reply to Bob Johnston, 09-03-2007 07:04:16  
Bob:

Your 1956 tractor has the smaller head bolts if it has the original engine block. It may have either head if the head has ever been changed. Sleeves are available to use heads with the larger bolt holes on engines with small bolts.

You can use the head bolts over if they have not been damaged but do NOT use locktite on the head bolts.

Dean



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Dean

09-02-2007 18:50:04




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 Re: Ford 860 Power/compression test results in reply to Bob Johnston, 09-02-2007 12:28:44  
Bob:

The cover on the right side of the engine is the tappet cover. It allows one to remove and reinstall the cam followers upon rebuild but valve adjustment is done at the rocker arms beneath the valve cover.

Again, you almost certainly have a blown head gasket between cylinders 2 and 3. The odds of 2 separate valves burning or sticking in two cylinders at nearly the same time are vanishingly small.

The reason that your engine will no longer crank: Your battery has been run down and/or you have one or more faulty connections somewhere in the primary circuit. You cannot measure battery capacity with a voltmeter.

Pull the head and have a look see.

Dean

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Jerry/MT

09-03-2007 11:06:57




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 Re: Ford 860 Power/compression test results in reply to Dean, 09-02-2007 18:50:04  
Neighbor's 9N had both #2 and #3 intakes valves stuck. Guess that must be the only time in recorded history that it ever happened.



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Dean

09-03-2007 11:43:05




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 Re: Ford 860 Power/compression test results in reply to Jerry/MT, 09-03-2007 11:06:57  
Like I said, it can happen but this is extraordinarily rare unless the tractor has been sitting for some time.

Dean



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Jerry/MT

09-02-2007 15:37:16




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 Re: Ford 860 Power/compression test results in reply to Bob Johnston, 09-02-2007 12:28:44  
It could be a blown head gasket bewteen #2 & #3 but with only 20 psi, I think your valves are either stuck ot burned, too.
Try usung jumper cables between the battery and the starter BUT MAKE SURE YOU ARE OUT OF GEAR. If it turns over, then check the circuit between the battery and te starter. If it doesn't turn over, your problem is the starter. It may need the commutator cleaned and new brushes.

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Dean

09-02-2007 15:12:24




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 Re: Ford 860 Power/compression test results in reply to Bob Johnston, 09-02-2007 12:28:44  
Bob:

I agree with Old. You almost certainly have a blown head gasket between #2 and #3 cylinders.

I would not waste time with further diagnostics but pull the head to have a look see.

Dean



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CENTAUR

09-02-2007 13:52:46




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 Re: Ford 860 Power/compression test results in reply to Bob Johnston, 09-02-2007 12:28:44  
Take the spark plugs out first and see if it will crank over and start.You may have a hydraulic lock which can cause major damage.I think you have a blown head gasket between #2&3 cylinders. Forget about the valve lash as it does not suddenly change. CENTAUR



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Bob Johnston

09-02-2007 14:59:35




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 Re: Ford 860 Power/compression test results in reply to CENTAUR, 09-02-2007 13:52:46  
What would cause a hydraulic lock? When I pull the plugs out if that is the issue should the engine turn over?



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CENTAUR

09-02-2007 15:51:01




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 Re: Ford 860 Power/compression test results in reply to Bob Johnston, 09-02-2007 14:59:35  
SORRY.I have seen Fellows dump large amounts of oil trying to sell customers a ring job.OLD is right.CENTAUR



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old

09-02-2007 15:20:41




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 Re: Ford 860 Power/compression test results in reply to Bob Johnston, 09-02-2007 14:59:35  
Only way you could get a hyd lock would be if it started leaking coolant into the #2 and 3 cylinder and thats not likely because it will not do that very easy if you havenn't got it to run since you did the compression check



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old

09-02-2007 13:45:15




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 Re: Ford 860 Power/compression test results in reply to Bob Johnston, 09-02-2007 12:28:44  
Sounds like you may have a blown head gasket. Probably blown between #2 and 3. Either way you go you need to pull the hood off and the gas tank then pull the valve cover. From there you will be able to tell a lot more as in if the valves are working as they should or if you have one stuck open or set wrong. If you find nothing there then its time to pull the head

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Bob Johnston

09-02-2007 15:03:41




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 Re: Ford 860 Power/compression test results in reply to old, 09-02-2007 13:45:15  
I will do that but before I take the cover off and since the engine won't turn over any chance the starter relay/dolenoid is bad causing the no turn over condition?



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old

09-02-2007 15:11:37




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 Re: Ford 860 Power/compression test results in reply to Bob Johnston, 09-02-2007 15:03:41  
On that it could be something as simple as poor connections either at the battery or where it grounds or on the solinoid. It could also be a bad solinoid or starter.



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