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Jd stx38 engine trouble

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K Burchette

06-10-2003 19:10:01

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My stx38 will mow for 15 minutes then dies out. After about 1-2 hours later it will start back up for another 15 minutes. It really takes a long time to mow the yard this way, but jdeer wants $55 per hour to diagnose it. Any thoughts from anyone?

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Mark

06-11-2003 06:55:33

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Re: jd stx38 engine trouble in reply to K Burchette, 06-10-2003 19:10:01

It's possible that the valve stems have a buildup of carbon or glazed from oil deposits that expands with the engine heat and then will stick open until they cool down. If you remove the valves, the stems may look really black. The valves would need to be removed, the stems polished and the guides cleaned.

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John T

06-10-2003 21:37:04

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Re: jd stx38 engine trouble in reply to K Burchette, 06-10-2003 19:10:01

It would help if right after it quit you can determine if shes starving for fuel or the plug quits firing. If possible, remove the plug and have its wire atatched and its side against metal for a ground and crank her over and see if shes firing????? ? If so, its probably a fuel starvation problem. Does choking her keep her runnign a while when she starts to die out??? If so, again, its a fuel starvation problem. Remove the fuel line where it atatches to the carb and insure a good continuous flow out the tank and through any filter if its a gavity feed. If it has a fuel pump, insure a good flow is getting to the pumps input at least. Those diaphragm type fuel pumps can go bad, so you may try her with just a straight gravily flow to the carb if it can be rigged up.

The usual suspects that can cause heat related ignition failures are corroded or burned or pitted poonts or the coil or condensor if it has points and condensor type ignition instead of solid state.

Be sure of the fuel flow and see if choking keeps her running (fuel starvation) and try and see if she is still sparkign when she dies out. The ability to run again after she sets could be an electronic cool down period or else the carb has time to re fill its bowl after a restriction initially caused her to run short of gas.

John T

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Bryan Rausch

07-09-2003 19:04:37

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Re: Re: jd stx38 engine trouble in reply to John T, 06-10-2003 21:37:04

I tried both of your suggestions above and the engine still won't fire. I have a STX38 with a yellow deck.

Problem: I mow for about 10 minutes and the deck and tractor engine both die. If the tractor sits overnight it will start the next day.

Any suggestions.

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