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Old 01-21-2008, 04:16 PM   post #1 of 318
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Default My tractor won't start

Ok I finished putting everything on the tractor this morning and here's what happens when I try to start it:



I removed the plug and it has a big yellow spark. There is lots of compression too, I put my finger over the spark plug hole and the air blew it right back off. There is fresh gas in the carburetor and I even tried starting fluid. I can't get it to even think about firing.

Both valves move up and down that I can see. I made sure to line up the camshaft gear with the mark on the crankshaft gear, per tecumseh manual. Beyond that I am lost.

Any suggestions?
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Old 01-21-2008, 05:47 PM   post #2 of 318
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Default Re: My tractor won't start

See/smelling gas out the exahust or in the cylinder when you pulled the plug?
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Old 01-21-2008, 05:50 PM   post #3 of 318
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Default Re: My tractor won't start

If the timing is correct your finger will be blown off the plug hole at the same time you see spark. Well, at least within a mili-second or two.
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Old 01-21-2008, 05:53 PM   post #4 of 318
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Default Re: My tractor won't start

Did you try dribbling a little gas into the cylinder and then trying to start it?
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Old 01-21-2008, 06:41 PM   post #5 of 318
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Default Re: My tractor won't start

Just a thought and maybe I am not hearing it right but did you check the valve lash? It almost sounds like a valve is hanging slightly open. I know you said it has compression, but I would check the valve lash. Even a valve being slightly open all the time may still show compression. Also how about ignition timing, is that all set? Thats an old tecumseh right? does the ignition work off trigger pins on the flywheel? if so is the air gap correct?
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Old 01-21-2008, 06:47 PM   post #6 of 318
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Default Re: My tractor won't start

Yellow spark sounds like a weak spark...to me.
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Old 01-21-2008, 06:56 PM   post #7 of 318
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Default Re: My tractor won't start

Quote:
Originally Posted by jed12674 View Post
Just a thought and maybe I am not hearing it right but did you check the valve lash? It almost sounds like a valve is hanging slightly open. I know you said it has compression, but I would check the valve lash. Even a valve being slightly open all the time may still show compression. Also how about ignition timing, is that all set? Thats an old tecumseh right? does the ignition work off trigger pins on the flywheel? if so is the air gap correct?
I agree , sounded like it might be sucking air.
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Old 01-21-2008, 07:04 PM   post #8 of 318
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Default Re: My tractor won't start

Quote:
Originally Posted by DYT4000 View Post
Yellow spark sounds like a weak spark...to me.
I agree with that. and maybe the valves. But for kicks you could try this.

You have a kill wire on the front of the shroud that goes to the mag. A wire from the key switch also hooks to that screw, if thats on. unhook the wire that goes to the key switch but leave the mag wire. Sometime a bad key switch will ground out the mag giving you a weak spark. You can recheck the spark to see if it looks different or just try to start it, your key won't turn it off though, choke it to trun it off.
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Old 01-21-2008, 08:06 PM   post #9 of 318
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Default Re: My tractor won't start

Quote:
Originally Posted by jed12674 View Post
Just a thought and maybe I am not hearing it right but did you check the valve lash? It almost sounds like a valve is hanging slightly open. I know you said it has compression, but I would check the valve lash. Even a valve being slightly open all the time may still show compression. Also how about ignition timing, is that all set? Thats an old tecumseh right? does the ignition work off trigger pins on the flywheel? if so is the air gap correct?
What is valve lash? Tecumseh said to line up a little dot on the cam gear with a beveled edge on one of the crank gears. Was there something else I needed to do?
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Old 01-21-2008, 08:29 PM   post #10 of 318
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Default Re: My tractor won't start

lash is valve adjustment , is that in your book ?
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Old 01-21-2008, 09:09 PM   post #11 of 318
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Default Re: My tractor won't start

it is the air gap that is suppose to be between the valve stems and the lifters.
There needs to be a little bit of a gap between them for when the engine heats up everything expands. With out this gap it will hold valves open and you would be without enough compression. It should be in your book, maybe in the maintenence section under valve adjustment.
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Old 01-21-2008, 09:26 PM   post #12 of 318
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Default Re: My tractor won't start

Quote:
Originally Posted by jed12674 View Post
Just a thought and maybe I am not hearing it right but did you check the valve lash? It almost sounds like a valve is hanging slightly open. I know you said it has compression, but I would check the valve lash. Even a valve being slightly open all the time may still show compression. Also how about ignition timing, is that all set? Thats an old tecumseh right? does the ignition work off trigger pins on the flywheel? if so is the air gap correct?
This model does not have trigger pins. It does have ACR (automatic compression release) and if its working it does hold a valve open, so you will have the sucking sound threw the muffler. There is a pin on the cam that holds the valve up till it starts.

queen of spades

1. Did you ever mess with the valves and if so did you adjust them after ?
2. Your spark is yellow and should be more of a blue color. Still if its getting gas and you get it turning over fast enough it should pop. Never crank it for more then 30 sec's as it could burn out the SSI.

If it was mine I would jump it to get it really wheeling and make sure its getting gas. Also you could try a different plug, some plugs will spark but not good enough.

Did this run before the rebuild ? just to make sure what we have here.
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Old 01-21-2008, 10:17 PM   post #13 of 318
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Default Re: My tractor won't start

SF:
1) A machine shop rebuilt the block for me, new piston, turned crank and replaced one of the valves and grinded the other. They are a high-volume shop and I've had work done there before (I trust them). After getting the engine back I did nothing except put the lifters, cam & crank and bolt it all together (after making sure to line up the marks mentioned ealier).

2) I installed a new plug before trying to start it.

It ran fine before the rebuild, except for a loud knocking noise (which the machine shop guys said was the lower rod bearing).

I won't have time to work on it again for a few days because of school & work. I have the battery on a charger now but will try jump starting next.
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Old 01-21-2008, 10:26 PM   post #14 of 318
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Default Re: My tractor won't start

Did the machine shop have the cam shaft there when they replaced the one valve and reground the other? If not there is your problem, after grinding a valve or replacing one you need to check and reset the valve lash. The reground valve will sit lower in the seat making the stem sit closer( or tight to the lifter giving it no clearance. Also a new valve will more than likely have more material on the end of the stem causing the same thing. This will hold the valves open when they should be closed.
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Old 01-21-2008, 10:29 PM   post #15 of 318
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Default Re: My tractor won't start

If the shop did not have the cam, lifters and valves in the block, they probably did not set the valve gap.
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