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Discussion Forum
:

981 runs terrible, I have tried everything. Please Help!

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Dan J

04-28-2003 19:35:09




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I took my 981 to the annual plow day yesterday. It was running fine until I had been plowing for a few minutes and started missing badly. I have tried everything I can think of and now am relying on the experts (you). It runs fine for a minute or two and seems to lose #3 & 4 cylinders. You can pull either or both plug wires and it doesent make much difference. I have dissasembed and cleaned the carb, fresh gas, timed the tractor, Replaced: Plugs (3 sets), Points, condenser, rotor, cap, wires, coil and even tried a good distributor. I am stumped, runs fine when first started and starts missing about a minute later. Compression is 118# on each cylinder +or- 2#. It throws a blue spark 1/2" or more but still 3 & 4 dont seem to be doing much. I know I am missing something but don't know what. PLEASE help. Dan

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Got it !! Scott1 wins, Do we give prizes?

04-29-2003 21:16:40




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 Re: 981 runs terrible, I have tried everything. Please Help! in reply to Dan J , 04-28-2003 19:35:09  
Finally got it. Sprayed carb cleaner around the intake manifold for #3&4 cylinders and the RPM's would increase. Found a crack almost all the way around where the manifold bends. One stick of nickel welding rod and I'm back on the road. Thanks for all the help guys. Dan J



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Tom M

04-30-2003 03:34:34




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 Re: Re: 981 runs terrible, I have tried everything. Please Help! in reply to Got it !! Scott1 wins, Do we give prizes?, 04-29-2003 21:16:40  
when welding up your manifold, bolt it down flat as it would be mounted on your block then weld it.

Heating and welding that crack may warp your manifold after it expands and cools, then you have another problem of the manifold not seating to your block after you hoped to fix the crack.

Let it completely cool before unbolting it from a flat surface.

Don't aske me how I learned that. Tom M

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Jerry D in NC

04-29-2003 09:46:24




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 Re: 981 runs terrible, I have tried everything. Please Help! in reply to Dan J , 04-28-2003 19:35:09  
Couple of the more simple things would be to determine if the thing runs better or worse with the choke pulled out. Need to determine Fuel or Fire issue. Do you have a vented gas cap? Is the fuel line laying on the manifold and causing a vapor lock? Does it run good for hours if it is not loaded? Could it be a slower running fuel line that will not quite keep up with the demand when pulling hard. Does the distributor have side play that will cause it to shift the point gap?

First thing I would check would be that fuel cap especially if you filled the tank full trying to help it get more fresh gas for the Plow Day. The more full the tank the less space for air the quicker it would pull a vacumn

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two things. possibly 3 things....

04-29-2003 08:49:03




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 Re: 981 runs terrible, I have tried everything. Please Help! in reply to Dan J , 04-28-2003 19:35:09  
either the timing is off or you got bad gas and debris or water. just out of curiosity how is the antifreeze? is it oil filled? like a cracked head or blown head gasket?



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buck

04-28-2003 20:32:41




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 Re: 981 runs terrible, I have tried everything. Please Help! in reply to Dan J , 04-28-2003 19:35:09  

I would suggest that you run a compression test with the engine hot-concentration on the no. 3 and 4 I would suspect that once your valve train components have gotten hot your are running out of clearence keeping the valves slightly open. Fireing order is corrrect-right.



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More info (Dan J)

04-29-2003 05:50:06




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 Re: Re: 981 runs terrible, I have tried everything. Please Help! in reply to buck, 04-28-2003 20:32:41  
Buck, Thanks for the reply and I took your advice this morning. Actually, the compression goes up after the tractor is warmed up. Cold I had 114,110,107,110 and hot it went up to 118,115,115,117. Wires are on correctly. I am hereby befuddled. Dan



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buck

04-29-2003 10:03:22




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 Re: Re: Re: 981 runs terrible, I have tried everything. Please Help! in reply to More info (Dan J), 04-29-2003 05:50:06  

good information and others have also given good advice. One further step on the compression. Could you give the numbers for first stroke only on the compression? All plugs out and no oil added to cylinders--attempting to make sure that valves are seated. will check back



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Scott1

04-29-2003 10:00:13




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 Re: Re: Re: 981 runs terrible, I have tried everything. Please Help! in reply to More info (Dan J), 04-29-2003 05:50:06  
Check when it's not running so well that the intake manifold is not warping out of shape and leaking. Heat her up, and spray some GOOD carb cleaner at the intersection of the manifold and head. If I'm not mistaken, this is the only thing #3 & 4 share that's different than #1 & 2. I'd almost bet that you are warping your manifold with the heat and getting an air leak. Either replace the intake manifold, or have it milled and put in new gaskets.

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