Re: Re: Re: Re: Re: Re: Re: Re: SPARK PROBLEMS Cont.
[ View Follow Ups ] [ Post Followup ] [ Return to Tractor Talk ]
Posted by farmer on June 21, 1998 at 17:36:38:
In Reply to: Re: Re: Re: Re: Re: Re: Re: SPARK PROBLEMS Cont. posted by Joe brown on June 21, 1998 at 15:58:46:
: :
: : : : : : : : First of all thank you all for the advice. The plugs are all clean. I'm running Champ. D15Y's, this is what the IH dealer gave me. Should I have D21's?? The plug wires all have steel cores. I,ve checked the manifold and gaskets for leaks, all ok as far as I can tell. New carb Zenith, can only change the mixture at idle. I tried Farmers advice. With the engine running "and missing" I put a paper clip at the boot where the plug wire attaches to the plug. #1 throws a 1/2" spark as I move the paper clip away from the top of the plug and there is no change in the engine. Same with #2. When I get to #3 AND #4, as soon as I move the clip away and get the 1/2" jump on the air gap the engine smooths right out. As I move the clip in towords the plug it appears the spark gets MUCH weaker and the engine runs rough again. I really don't think its a mixture problem. For some reason if I don't make the spark jump and air gap on either #3 or #4 it appears that my at leasety to #3 #4 cylinders gets weak. This is a tough one!
: : : : : : : : PS: Don't worry about the resistor, I never listen to my neighbor anyway!!!
: : : : : : : How is the compression on 3&4? : : : : : : : Lee Bradley : : : : : : Lee,
: : : : : : I have not checked the compression. I'll admit I'm a begginer. Is this my next step?
: : : : : I would check the compression on all cylinders. The higher the compression the denser the air/fuel charge and the easier it is to ingnite. If the compression is down on 3&4, I would expect the head gasket is blown between the cylinders. Not a huge problem but some work. : : : : : Good luck,
: : : : : Lee
: : : : I did pull the head when I first got the tractor. I inspected all of the cylinders and valves to see how they were seating. Everything looked great so I replaced the head gasket with a new one and buttoned hear up. I'll go check the torque on the head bolts. I did notice that some of the valve clearences were not to spec. I made an attempt to adjust them but the adjustment seemed tight and I didn't want to break any thing. : : :
: : : Joe : Lee has you on the right track with the compression check, any time you have a problem and two cylinders next to each other act up the same be suspicious of the head gasket.
: : : Good luck.
: : Lee, I had similar problems with my H's. I found Champion D15y's were the problem. I went to 18's and have had no problem since. You can also go to 21's. Good luck : I know I should have checked the compression first but I only have time to work on the weekends and the parts store is closed. I took a shot and pulled the head. Gasket looked fine and there was no sign of leakage, valves are seating well. I did notice a little oil on the top of #4. I know it's just speculation but wouldn't I have a bee hive smoker if the rings were bad. No smoke at the stack unless I excellerate quickly, then it goes away. Any thing else I should look for while I have the head off? I hope it is as simple as the type of plugs I'm running. If I had a lake this things close to making a nice fish structure! Turn it over several times with the crank and watch to see if the valve action is uniform on all cylinders. When it goes back together if you haven't found a problem, try switching plugs and plug wires around to see if the same two cylinders remain the problem. If the plugs are new, try setting the gap smaller.
Follow Ups:
Post a Followup
|
