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jdemaris
03-10-2005 20:28:31
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Re: 2010 JD crawler in reply to StephenMO, 03-10-2005 18:34:05
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There are so many things that could be wrong with it it's kind of hard to come up with a check list - especially with a machine that hasn't run in quite awhile - and not knowing what's been done to it along the way. You mentioned putting a lawn mower igntion switch in it - hopefully from a battery ignition mower and not a magneto mower? A magneto mower swith won't work. First, you have to ascertain you've got the essentials - compression, spark, and fuel. There's no sense fooling with it until you know you have compression - so pull the plugs, put a gauge in it and find out. If it has generally the same compression in all four cylinders (assuming it's not all zeros and hopefully 100 PSI or over), next check for spark. Pull one of the plug wires off, put a spark plug in the end of it, a lay the plug anywhere on the engine so it's grounded. Crank the engine. If you see spark, then next break or bend the electrode in the plug so it has a 1/4" gap (more of less). Then crank again. If the spark has now disappeared, it's too weak. If you have no spark at all - with a normal gap or the expanded "test gap", try the test again with the coil wire instead of a spark plug wire. If spark is now good - you've got a problem in the cap and/or rotor. If the spark is still no good - it's time to check the points for making and breaking, power to the coil, etc. If in doubt about power to the coil, try running a jumper wire to it right from the battery and see if it makes a difference. If you've had good spark all along, and you know you have compression, then check to see if you're getting spark at the correct time. Pull out number one spark plug, crank the engine in it's normal direction, pull the timing window/cover off by the flywheel, and get the engine on DC (top dead center) on the compression stroke. You'll know when it's on compression stroke if you feel compression building up in the spark plug hole just as the engine is getting close to the DC mark on the flywheel. If you're 180 degrees off on the exhaust stroke, you won't feel any pressure. Once you have it on DC of the compression stroke, it should fire (make spark) on number one spark plug wire. If not, find out why. If someone has had the oil pump out of the engine, the pump has to be timed of you won't get the ignition in time. If you have spark at number one cylinder at the correct time, then check the rest of the wires to make sure they are on the cap in the right order. Engine firing order is 1-3-4-2 - and looking down at the distributor cap, they fire in counter-clockwise rotation. I won't go on any further for now. You've got to have some level of expertise of mechancics or my explaining this won't be of much use. So, if this makes sense to you - then try it and repost.
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