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What's next?

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Garry

11-24-2003 07:52:49

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This is probably a common question here but I need some suggustions. I have an AC WC that I can't get running. I did get it to run for about 15 seconds a little while back but now won't fire. The plugs are getting fire and the timing is ok. Gas is getting to the carb and I just put a new carb on. I took the breather hose off and sprayed starter fluid and still nothing so I'm guessing it a fuel problem. Nothing seems to be cloging the fuel up the manifold. What do I do next.

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Garry

11-25-2003 06:14:06

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Re: What's next? in reply to Garry, 11-24-2003 07:52:49

Thanks guys for all the suggustions. This gives me some ideas. I think it is a fuel problem evan though I tried the either. I will take the intake manifold off and check for clogs. It is clear at the carb but maybe it is somewhat clogged up further. I had checked the rotor at the #1 TDC location at it was ok. There are several ideas here I'll try. Sometimes I can get too focused and miss the obvious.

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DougKirk

11-25-2003 04:53:46

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Re: What's next? in reply to Garry, 11-24-2003 07:52:49

Open gas cap and place mouth over it and blow into it creating a seal with your mouth. Hold breathe and release, make sure the valve is open before you do this. If it starts, then you have a slight clog in fuel line or bowl.

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john

11-24-2003 19:37:33

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Re: What's next? in reply to Garry, 11-24-2003 07:52:49

Do not know this particular engine but lets see if I can help.
While it did run for 15 seconds lets start back at the beginning.
Check compression, Restrict top of carb. and tail pipe with hand and feel for vaccum and pressure. This will tell you valves are still working or restriction in intake.
If you can feel a vaccum at the carb when cranking and you gave it a shot of either it has to be electrical.
You say timing is Ok. Do not think it could be 180 deg out because it did try to start once. But pin could have sheered that holds gear on bottom of distributor. Check rotor placement with # one at TDC.
If all this checks out then your fire is not hot enough. Spark plugs can fire when checked then not fire in cylinder because it is under pressure from compression. Also a tracked dist. cap could fire normal when checked then fire on the wrong cylinder because the plug that is not under compression is a eaiser path to ground.
Start at the coil and make sure you have a good strong spark that will jump a sizeable gap and work your way to the plugs.
Or you could do like some people do. Start changing parts from the cheepest (plugs) on up till you figure it out. While this waste money it is a whole lot easier on the brain.

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Delbert

11-24-2003 15:46:04

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Re: What's next? in reply to Garry, 11-24-2003 07:52:49

Could it be the timing gear on the cam shaft? If the valves no worky,no runny. This is my dumb guess with the either and no go could be the problem. I my be wrong but think you could have spark but no valves. Someone let know if i,m wrong on this thanks.

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11-24-2003 16:28:04

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Re: Re: What's next? in reply to Delbert, 11-24-2003 15:46:04

I thought about that but remembering that both the distributer and valves are driven off the cam, I let it go. But if you got spark and it won't light the ether, unless nothing's getting sucked into the cylinders. Tough one.

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wdTom

11-24-2003 16:40:44

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Re: Re: Re: What's next? in reply to CH, 11-24-2003 16:28:04

Could the timming be 180 degrees out? firing between exhaust and intake I mean? I think when this happens it will fire , but not run. Do you have a nice fat spark that will jump 1/4 to 3/8"? Is the intake manifold plugged with a mouse nest or something where you missed it? I don't know how long the tractor has set. When you open the drain on the bottom of the carburator does gas come out and keep comming out, I mean more than would be in the float bowl, say a few cups of gas? Do you have a massive vacume leak, big rust hole in the manifold maybe? Could be between the intake and exhaust side inside where you can't see it.

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twopop

11-24-2003 13:00:53

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Re: What's next? in reply to Garry, 11-24-2003 07:52:49

if you sprayed fluid and nothing happened,it would seem like a electrical problem.did you move the plug wires?or as g.king posted,is it 180 degrees out.
take a compression check,over 70 psi should run
check for tdc on compession stroke,time rotor to tdc
check distributor cap for cracks
check firing orderX rotor rotation

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johnr

11-24-2003 19:20:16

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Re: Re: What's next? in reply to twopop, 11-24-2003 13:00:53

pull a plug or two and place a very small amount of gas in hole,replace plugs and crank. if it fires the problem is fuel or intake related. sometimes works for me

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G.King

11-24-2003 11:36:12

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Re: What's next? in reply to Garry, 11-24-2003 07:52:49

Is the timing 180Deg. out????

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twopop

11-24-2003 09:35:53

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Re: What's next? in reply to Garry, 11-24-2003 07:52:49

you say the plugs are getting fire,but,i think you should pull them out,attach the plug wire put the plug against the block and see if the spark is getting to the ground strap..if you have champion plugs,they will gas foul quickly.

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Garry

11-24-2003 10:35:44

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Re: Re: What's next? in reply to twopop, 11-24-2003 09:35:53

That's how I checked them. They are getting fire to the plugs and gas is going to the carb. The carb is new. The tractor does not have a mag. thanks for the replies.

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RAB

11-24-2003 13:55:05

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Re: Re: Re: What's next? in reply to Garry, 11-24-2003 10:35:44

Garry,
You say gas is going to carb. Is it going to the cylinders? If plugs are dry after prolonged cranking, then it is not. No fuel - will not run.
A new carb does not mean it is infallible. Is main jet on carb adjustable and is screwed full in? Does fuel get into the carb as opposed to getting to the carb? (Small change in wording, big change in meaning!)
Is the choke control working?
Is there an air leak on the inlet side between the carb and the engine?
Regards, RAB

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11-24-2003 09:13:41

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Re: What's next? in reply to Garry, 11-24-2003 07:52:49

Three thinng you need:
Compression, Spark and fuel.

First do a compression check, if you have little or no compression it won't start.

If you have good compression check all electrical wires and connections. Remove your mag and have it tested by a knowledgable mag technition (almost any auto electric rebuilder can do this)

If you have compression and spark, rig up a gas can feed your carb from the can, thus eliminating the gas tank. If it starts and runs, connect to the tank.

If it doesn't run, troroughly clean your tank and fuel lines.

I would guess your problem is varnish gas in the tank and carburator.

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Larry from MD

11-24-2003 08:54:47

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Re: What's next? in reply to Garry, 11-24-2003 07:52:49

If you still have the mag on its probably sparking when you check it cranking slow but will not fire when it goes fast.sign of a weak coil.

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Jonathan

11-24-2003 08:14:04

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Re: What's next? in reply to Garry, 11-24-2003 07:52:49

are you sure the coil wire didn't come off, because it should have fired on either.

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MIke (WA)

11-24-2003 08:11:35

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Re: What's next? in reply to Garry, 11-24-2003 07:52:49

If it didn't fire when you sprayed ether, its an electrical problem, not fuel (you supplied the "fuel" when you sprayed the ether).

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