Coil Question

[yeld]

This message is a reply to an archived post by John T Troubleshooting on April 11, 2009 at 11:44:21.
The original subject was "Re: Coil Question".

Well I got the 130 running but it had a miss.So I looked at the plug wires and they were not in the right order.Then I put them to where they wre supposed to be according to the book.Now when I try to start it wants to backfire.What do I do now?Thanks anyone.

 

[rustred]

wire position means nothing unless you know they are in factory position and have not been changed by shade tree mechanic's. and just a miss should not be wrong wire position as you would have at least 2 cyl's not firing. get #1 cyl. at tdc on compression and look where the rotor is pointing and start from there. factory #1 is always at around the 2 oclock position. going clockwise. to check that miss you can pull each wire off at the plugs and see how each is firing at a slow idle. can be anything from a bad plug to bad wire. plus check the points and gap. same with carboned up plugs wont fire correctly. AND always check your compression, so you know your not working on a dead horse.

 

[John T]

If its backfiring the start timing may be too fast/advanced orrrrrrrr the plug/wire firing order may still not be correct.

Other problems may be a valve that's bad or stuck not related to ignition timing

I done forgot already lol was it a battery powered coil distributor ignition or a Magneto ?? Regardless, if its firing too much BEFORE Top Dead Center (TDC) when starting it can backfire.

John T

 

[khouse6]

plug wires, from front to back, #1 is front, #2 , etc going to the rear of the engine. firing order is 1,3,4,2. rotor turns clockwise. distributor cap usually has a 1 marked on the cap. take something and mark the position of #1 on the cap, on the distributor body. remove the distributor cap. is the rotor button pointing towards the mark that you just made on the distributor body? if not, loosen the distributor hold down bolts and move the disstributor body, until rotor button lines up with the mark on the distributor body. tighten bolts , replace cap, start engine.

 

[Janicholson]

To assure your compression stroke TDC: Remove all plugs. Then take a ball of cotton, at least an inch in diameter, and put it in #1 plug hole (just blocking the hole, not stuck down the cylinder) rotate the engine with a hand crank, or if none, using the fan and pushing on the belt slack side to turn the engine (clockwise standing in front of the tractor). When the cotton blows out, it is on the compression stroke. Put a plastic drinking straw in the #1 plug hole. Again turn the engine slowly in the correct direction until the straw is sticking out as far as it will go. THis is very close to DC, and the rotor will now be pointing to #1 plug location in the cap. (it might not be where you think it is, but just start there and put them in 1342 clockwise around the cap. Jim

 

[gene bender]

you are out of time

 

[khouse6]

good reply. i however, bump the starter. to blow the cotton out.

 

[David G]

Backfire is probably 180 out of time.

You sure #1 is on compression?

 

[David G]

Put the wires back where they were, send us pictures.

 

[rustred]

u still need to time the engine. and ih has no #1 marks for #1 distributor terminal. its at 2 oclock on all ih tractors from factory.

 

[yeld]

In reply to ja Nicholson,I did the thing with the cotton and the straw and I got it started but still not running like it should.when I took the plugs out they were pretty sooted up so I will clean and try again.Also wondered if timing may be off now.

 

[yeld]

I cant remember where they were when I took them off.I should have taken a picture.

 

[yeld]

It's a battery powered coil.

 

[Janicholson]

If it started, the timing is not that far off. By way of redundancy: the rotor turns clockwise when looking at it from the brake pedal point of view.
From where you put #1 plug wire in the cap, the next one CW should be #3 cylinder, then #4 cylinder, then #2.
If it still misses, after cleaning the plugs, make sure the pointa are set at .020" when the movable point rubbing block is on the high point of the
distributor cam. Also try to wiggle the cam toward the engine, and away, up and down. If it moves at all that you can see, or feel, it is bad and will
make it run rough. Turn the rotor clockwise gently about 10 to 15 degrees. then let it go. it should snap back to where it was. If it didn't, the
centrifugal advance is messed ul. It is located under the breaker plate in the distributor. Again it takes some expertise to take it apart and rebuild
it. Jim

 

[yeld]

(quoted from post at 18:16:28 06/23/20) If it started, the timing is not that far off. By way of redundancy: the rotor turns clockwise when looking at it from the brake pedal point of view.
From where you put #1 plug wire in the cap, the next one CW should be #3 cylinder, then #4 cylinder, then #2.
If it still misses, after cleaning the plugs, make sure the pointa are set at .020" when the movable point rubbing block is on the high point of the
distributor cam. Also try to wiggle the cam toward the engine, and away, up and down. If it moves at all that you can see, or feel, it is bad and will
make it run rough. Turn the rotor clockwise gently about 10 to 15 degrees. then let it go. it should snap back to where it was. If it didn't, the
centrifugal advance is messed ul. It is located under the breaker plate in the distributor. Again it takes some expertise to take it apart and rebuild
it. Jim

haven't been able to get back to it for a while but last night tested with spark plug tester.#s 3&4 had very weak spark.1&2 better but not blue.Wire from coil to distributer had oil on ends.Don't know why.Tractor starts easy and runs but has the miss.I had had some carbon wire on hand so I made some for 3&4 but still had miss.I don't know what else to do.Do you have any sugestions onwhat I could do now?Thanks.