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Farmall & IHC Tractors Discussion Forum
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Farmall valve timing

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RobPA

06-01-2005 18:05:37




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Have a B that has never run right since rebuild. Checked everything, spark,gas etc. Tonight checked valve timing. Book says as exh valve is closing and intake is just beginning to open on #1 cylinder the DC 1-4 mark on flywheel should be 4 teeth past reference mark on housing. When valves are in this position and I check flywheel the DC 1-4 mark is nowhere to be found. Did I screw up the cam/crank timing marks or could the flywheel be off 180 degrees? Would it run if this were the case? Thanks for help.

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El Toro

06-03-2005 08:50:11




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 Re: Farmall valve timing in reply to RobPA, 06-01-2005 18:05:37  
Did you get the tractor to start? If not you need to pull No1 plug and bring that piston up on the compression stroke to TDC. When you feel
compression against your thumb look for that timing mark on the flywheel. It's easier to see
if you chalk the timing mark. Keep rotating engine until that mark is aligned with the indicator. Then look at the rotor to see where
it is pointing. Should be at No1 plug wire.
Are you in PA? I'm in MD. Hal

PS: Both valves on No1 are closed if the valve timing is ok. If the rotor isn't pointing to No1
your distributor probably needs to be removed and
set at No1 position and reinstalled.

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captaink

06-02-2005 08:34:23




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 Re: Farmall valve timing in reply to RobPA, 06-01-2005 18:05:37  
You can not put the flywheel on wrong, the dowel pin and bolt pattern prevent that. If the cam is timed wrong it may or may not run, if it does, not very well depending on how far the cam is out of time. Others have already given you good ideas to consider.



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El Toro

06-02-2005 04:11:39




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 Re: Farmall valve timing in reply to RobPA, 06-01-2005 18:05:37  
Did you remove the cam gear during the rebuild?
The single punch marks on the cam gear should
match up with single punch marks on the crankshaft gear. The double punch marks should
match up with the punch marks on the governor gear. The cam keyway should be facing to your left too.

If it doesn't start after what Kansas and Allan
have suggested, I would check your cam gear. Mark that timing mark with chalk so it's visible
too. I would use my thumb to feel for compression on No1 cyl while someone slowly cranks. Once you feel the compression you could
a wire or screwdriver. At TDC that mark on the
flywheel should be aligned with the indicator. Then look at the rotor's position. Hal

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Kansas

06-02-2005 02:51:03




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 Re: Farmall valve timing in reply to RobPA, 06-01-2005 18:05:37  
Here's what I'd try.
take the plugs out, get a screw driver or baling wire, rotate until #1 is at TDC---at this point you'll either be on compression stroke or intake stroke---if both valves are loose, you're on compression---you're gonna use the wire to feel the piston moving.....you'll feel it as it reaches the very top....ok...set the valve clearance on #1 cylinder....now take the top off the dist. and see where the rotor is, is should be pointing to the tower on the #1 plug....now, go thru the firing order setting the valves and making sure the rotor is in sync with the engine sequence....once you've done this is should pop off, you'll need to guess as to where you want to be as far as degrees Before TDC on firing, but I'll bet you can do it by ear and be pretty darn close.... What you're describing....where the exhaust valve is closing and the intake is opening, is the period of overlap....I don't have any books here, but on semi's...Detroit Diesels in particular...this is what you do to find out where you are in the firing order...you know what cylinder is in the overlap period and then you set the cylinder thats firing. I'm thinking that probably, when #4 is in overlap, you need to set the valves on #1....this is why I say use something to feel the piston with....you'll know exactly where it is. My guess is that you've set your valves when you weren't in the correct sequence....I don't really know, but it may be close enough to run, but just not right....hope this may be of some help to you. Goodluck.

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Allan in NE

06-01-2005 22:20:07




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 Re: Farmall valve timing in reply to RobPA, 06-01-2005 18:05:37  
Rob,

I know nothing about your tractor, but there is absolutely no possible way you can be "off 180 degrees" because 180 degrees out is the same as dead on, since the crank has to turn twice for every one reveloution of the camshaft.

Are you sure that the book doesn't say #4 cylinder? Exhaust valve just closing and the intake valve just opening means that the piston is on the intake stroke, not the power or firing stroke. So, as cylinder #4 is on the intake stroke, cylinder #1 should be on the power or ignition stroke.

If the book indeed has you timing the thing on the intake stroke, I think you are on the wrong stroke of the wrong cylinder.

See what I mean?

Allan

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CNKS

06-01-2005 19:17:18




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 Re: Farmall valve timing in reply to RobPA, 06-01-2005 18:05:37  
With #1 at TDC, both intake and exhaust valves are closed. At this point, the referred to mark should be at or slightly past the reference mark. You have to clean the flywheel off good to find the mark--It IS there. If you have had the front cover off for access to the camshaft, etc, the marks on the cam gear must line up with corresponding marks on the crankshaft and magneto gears.



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RobPA

06-01-2005 19:58:59




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 Re: Farmall valve timing in reply to CNKS, 06-01-2005 19:17:18  
CNKS- the TDC mark is on the flywheel, easy to read. But when I position the valves on #1 cylinder as the book says the mark is not lined up with the casting. It isn't even visible at all through the inspection hole.



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MACE

06-02-2005 08:20:10




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 Re: Farmall valve timing in reply to RobPA, 06-01-2005 19:58:59  
Where is the mark again? I have an A with a C113 and have never seen that blasted little 1-4 DC mark you guys are talking about. I suppose I need to clean my flywheel off. Which hole do I look through and where specifically is this mark on the wheel? My transmission case has 2 holes ( one large, one small) on the bottom and 1 on the left side.

Thanks,

MACE



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RobPA

06-02-2005 14:55:10




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 Re: Farmall valve timing in reply to MACE, 06-02-2005 08:20:10  
Mace the DC 1-4 mark is on the flywheel. Remove the cover under bellhousing and look in there on flywheel. Thanks to everyone. I will go through timing again and see where I am at.



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