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Farmall & IHC Tractors Discussion Forum
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560 gas won't hit on all 6

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Farmall Daddy

11-21-2005 15:55:02




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I rebuilt my 1962 Farmall 560 over the winter. The motor was bored from the 263ci out to the 301 cubic inch. I had the head shaved and the block trued up, valves ground, and the rest of the motor internally is new. I have asked a lot of mechanics in my area about this problem, and they are even boggled by it. The motor will run perfectly when about 1700 RPMS, or when the tractor is under some type of load. The motor sounds rough on cylinders 5 and 6 at an idle. I have tried the carb, nothing there. I rotated the distributor 180 degrees, and now number 5 seems to fire better, but 6 still acts up. I am not sure if it would be something internally or not because it will dyno 81h.p. on the money and hold it very well. The only thing I am worried about at the moment would be that there is some play in the distributor shaft, and when i measured it, it was .020 play. Would this be enough to throw it off? If it is, then why does it sound good under load? Thanks for any input on this one guys!!

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JJK

11-22-2005 20:15:50




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 Re: 560 gas won't hit on all 6 in reply to Farmall Daddy, 11-21-2005 15:55:02  
I had an 856 gasser at work that ran the same way after I gave it a complete tune up, new exhaust manifold, rebuilt the carb. Right away it ran good except on 5 and 6, 5 being a little better of the two. I found that the manifold had a gap on the last port of the engine witch feeds 5 and 6. The manifold had been plained so the head couldn't have been true. All I did was fill in the gap with some gasket material and it ran like new again. Hope this can help you out.

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binderpower856

11-22-2005 13:47:28




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 Re: 560 gas won't hit on all 6 in reply to Farmall Daddy, 11-21-2005 15:55:02  
I had a similar problem with my 560G this summer at a tractor show. I was plowing in the show patch and under a load, it would cut out, spit, sputter, etc. I just knew it had to be a timing problem. First thing I did check, however, was the sediment bowl. It was clean, so I moved on to checking plugs, wires, cap, etc. Finally I turned around and went back to that sediment bowl. Took it down, cleaned out what little was in it, and before putting the bowl back on, I opened the valve to check fuel flow, and bingo, there was the problem... The orifice in the tank had gotten plugged with something, and was restricting fuel. I blew it out with an air compressor (be sure to remove the filler cap before doing that). Made it run like a top again.... Sure did sound like an ignition problem though.... That may not have a thing to do with what is happening with yours, but it's something you might check... Especially when it is only missing when fuel flow needs to be the greatest...

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captaink

11-22-2005 08:06:25




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 Re: 560 gas won't hit on all 6 in reply to Farmall Daddy, 11-21-2005 15:55:02  
I don’t remember (been about 18 years since I sold my 560 gasser) but is there a vacuum tap on the intake manifold? If there is, get a hold of a vacuum gauge and hook it up. A good solid engine should have 18-21 inches of vacuum and hold it steady even at idle. If it is low, you have an intake leak. I don’t remember all the readings and effects on a vacuum gauge but it seams to me that if the vacuum drifts between 15 and 21 inches there are timing issues. If it bounces steady, you have a burned valve or hole in a piston. Hopefully if you get the vacuum gauge it will include a trouble shooting guide. If not, e-mail me and I will look up what all the different types of readings mean.

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Jack NE

11-21-2005 17:40:44




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 Re: 560 gas won't hit on all 6 in reply to Farmall Daddy, 11-21-2005 15:55:02  
I had a 63 ford car that I had the same problem with. It turned out to be the dis. shaft. It was worn out of round. I suspect could be the same problem with yours. I replaced the dist. shaft and it ran great.



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Dave BN

11-21-2005 16:06:30




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 Re: 560 gas won't hit on all 6 in reply to Farmall Daddy, 11-21-2005 15:55:02  
Wow! Engines are funny though. Have you tripple checked the firing order and plug wire installation? A bad spark plug or two could do this. Have you done compression tests? A poorly seated valve or some other miner compression leak could affect low speed more than high speed. Did you have the camshaft reground? Maybe it's not right. Others will post with more ideas. Let us know the outcome Dave.

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Farmall Daddy

11-23-2005 08:02:46




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 Re: 560 gas won't hit on all 6 in reply to Dave BN, 11-21-2005 16:06:30  
The motor has a new camshaft in it. I also replaced the distributor cap, points, plugs, and wires. The valves were also checked and ground as you do during a regular overhaul. I have run a compression test on the motor, and number 5 is the lowest of all 6, but my dad and I didn't think that it would be enough to worry about. I may just have the manifold removed, and plained down. I might take the head in and have the valves and seats checked, and I'll check the pistons out while I have the head off. Thanks a lot guys!

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Janicholson

11-21-2005 16:39:55




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 Re: 560 gas won't hit on all 6 in reply to Dave BN, 11-21-2005 16:06:30  
With a point gap of .020, and slop of .020, there is little doubt what is (in my opinion) wrong.
I would have the distributor rebushed, and run an electronic ignition. As the speed increases the centrifugal advance probably centers the shaft and things are withing operational acceptability.
threre is no way the timing can be even close with that much cam angle variation. Some cylinders will be ok, but others will be way off (as much as 20-30 degrees. That is a great way to hole pistons.
Good luck on the repair. The shaft should be no more than .0015" of movement up/down in/out.
JimN

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