Caterpillar is annoying me...
Posted January 18, 2012 - 04:26 AM
another one of those crazy Walbro LME carbs on a Tec HH120. I've done everything I can think of, and it's still
doing the same thing. Aaargh
Posted January 18, 2012 - 05:31 AM
- Alc said thank you
Posted January 18, 2012 - 05:45 AM
If it cranks slow you will never get it to start.....
Is this engine horizontal, or verticle ?
- Alc said thank you
Posted January 18, 2012 - 07:14 AM
While fuel, air and spark are all required to make a gasoline engine run it is very important that all three are delivered in the proper amount and at the proper time.
The fuel and air must be at the proper mixture level. Too much or two little fuel in the can cause a no start. Also the fuel and air mixture must be properly compressed or it will not "explode". Perhaps the rings or valves are badly worn since the engine will run better wide open than at an idle.
The spark must be hot enough and properly timed to ignite the compressed air/fuel mixture. A weak spark may be caused by coil/magneto, improper air gap, partially or completely sheared flywheel key (often caused by an engine backfiring one time too many), weak magnets on the flywheel (they do go bad), dirty or improperly adjusted points or a bad condenser all can and do cause problems. A spark plug that has been "flooded" in cold weather will very often never work again and will require replacement ( ask any snowmobile owner).
- ducky, MH81 and Toolpartzman have said thanks
Posted January 18, 2012 - 10:02 AM
It takes higher voltage to fire the plug under compression.
- IamSherwood and Toolpartzman have said thanks
Posted January 18, 2012 - 11:28 AM
Edited by DanP, January 18, 2012 - 11:34 AM.
Posted January 18, 2012 - 03:20 PM
It does run better at higher RPMs when it has sat for a while (gas clot lol). I usually run it til it clears up.
Posted January 18, 2012 - 04:42 PM
Posted January 18, 2012 - 05:34 PM
Posted January 18, 2012 - 06:51 PM
Posted January 18, 2012 - 07:11 PM
I'm a "self professed" Carb Geek. Lost count on the number of complete rebuilds I've done over the past few decades but I remember it was well passed the 200 mark. :blush2:
- wvbuzzmaster said thank you
Posted January 18, 2012 - 07:42 PM
Posted January 18, 2012 - 08:15 PM
Posted January 22, 2012 - 10:19 AM
Fast forward to today, 10 minutes ago. Attempt one to restart was cut short, and you might ask why... I am still learning and glad I left the air cleaner setup off.. because I had a leak from the middle of the carb. Solution, snug the bolts up a little more and presto, no leak during attempt two, which resulting in a vroom that continued. I had just put the needle in some random number of turns so I spent a few minutes adjusting it until the tractor seemed to be running decent, and didnt stall out between high idle and a decent spend downthrottle. So I have shut the Caterpillar down with a victory, and plan to go back out to start it again after bit. There is a slight clack but I don't think it is a problem, never heard it before because of higher RPMs. Before I start it up again I will doublecheck the oil. it is so exciting when it runs, man I am excited now lol.