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Timing Jump???

A

Anonymous-0

Well-known Member
A friend of mine has asked my opinion about his gas tractor. Someone has told him that the reason it is so low on power is that it has jumped one tooth on the timing chain. He says it starts good but has about 1/2 the power it should have. He has checked carburetion and set timing correctly. I told him I had never seen an engine that would run in this condition. What is your opinion?
 
What tractor is it? It's basically impossible to jump just ONE tooth and be okay after that. If it jumps a tooth, there's usually devastation to follow.

I have no idea the symptoms that are going here, but check fuel lines for restriction and make sure you have a bright blue spark.
 
What tractor?? Would you believe I have never had one yet that had a timing chain. 99% of them have gears and if one jumps it also takes out the gear or gears. Probably a problem with low compression or carb problem or even the wrong plugs or plug wires
Hobby farm
 
If a tune-up doesn't help and the carb has plenty of fuel flow, check the governor and carb butterfly for full range of movement. Last thing, the manifold could be choked with carbon. You can find this out if you take the carb off and stick a finger up into the manifold.
 
When my friend bought the tractor he was told that the engine had been completly rebuilt. I agree and understand about timing gears. Sorry, I used the wrong wording. What I should have said was that the timing was off one tooth--a mistake made during assembly. I say if this is the case, engine would not run. I suggested that he has problems other then timing jump.
 
It is a 600 Ford. My friend is trying to decide whether to check the timing gear or to disregard it. I say he has other problems.
 
He can check easily at the rocker arms...at TDC after the exhaust stroke, they should both be closed or virtually closed..
The key is that this should happen AT TDCE and not shifted away from that timing point..
TDC is marked on the flywheel for #1 cylinder.

One tooth should swing the cam timing way off that mark..my guess is it would be 20 degrees or more off with just one tooth..
 
I would check the basics. If it has been rebuilt, I would check the timing, valve clearance and reset the points. Run it to top dead center, pull the #1 plug and make sure the piston is at tdc, pull the valve cover and verify both valves are closed. The check the distributor rotor position in relation to the #1 plug wire terminal. While you have the cover off, you can check the valve clearance. Other simple things to check, has the oil bath air cleaner been cleaned. The oil cup and the mesh, along with the precleaner.
 
Chances are his tractor doesent even have a timing chain as most are gear operated and they just dont jump time. Probably needs some new wires and plugs. Just how much power does he thinks that he needs and what makes him think that its power isnt up to shuff.
 
Simple. Check the timing. If it was one tooth out it would not be timed correctly, would it? Do the same with the valves. Specification s will show when valves should open/close.

Presume it does have timing marks on the flyewheel? Could possibly be worn woodruff keys or keyways on the component drives allowing everything to be sloppy. I see that on an engine I am (slowly) getting sorted.

Could be a worn out cam. Could just be simple maintenance service. Could be lots of things.

RAB
 
in order to check the valves at the rocker,you have to remove the hood and fuel tank.it is easier to remove the side plate and check that the lifters for #1 and # 4 are at the bottom of the lifter bore when the engine is at tdc.

first,check the dist.rotation direction and make sure it is timing 1 2 4 3 most 4 cylinder engines are timed 1 3 4 2 but not ford,so it could be firing on only two cylinders
 
If this tractor has the carburetor with a main jet adjusting screw near the bottom of the carburetor you need to open that when the engine is at full throttle until it starts to smoke from overfueling. Then close it some until the smoking
quits. Hal
 
ck the back lash of the cam gear in the front it will ware out because the hydralic pump runs off the back of the cam
 
Do a compression check. There is a chance that the head wasn't re-torqued after running it, and the head gasket may have blown between two cylinders.
 
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