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international 350 utilitt (gas)

S

sam un ont

Member
I have what appears to be dead. #2cylinder> When shorting out the plugs all make a difference except for #2. I did a compression test and all are within 5 Lbs. of each other. Tested spark ,it,s good,new plug no difference. Slackened off all valves and injected each with 120psi and all sounded good.
I do find however that I can remove all wires except #2 and that cylinder will fire when cranked over. Sprayed carb cleaner around the intake with no change
I cannot hear a miss when running but yet do not know why pulling off that wire makes no difference to engine rpm
I did not think the intake was at fault as #s 1 and 2 share the same intake and # I is good
Any ideas as I am sure the answer is staring me in the face but I can,t see it

Sam
 
Swap plug wires between the holes. If it follows the wire it is bad. check the valve opening distance, a worn cam lobe will do it. a crack in the distributor cap will do it. A way worn valve guide will do it. An internal crack between the exhaust plenum in the manifold system, and the intake heat chamber will do it. Jim
 
I have swapped wire and plugs with no change. the intake manifold is isolated from the exhaust so that is not it. the intake is comprise of 2 ports one feeding #3&4 and the other feeding 1&2 and #1is good. Have pulled the cover and adjusted valves with no change. the dist cap is good

Sam
 
With all due respect I think you're wrong about the intake runners.I believe 2 runners go to 1 and 4,and another goes to 2 and 3 combined.I have a 300 utility with basically the same engine.About 20 years ago it lost power and would foul #2 and #3 plugs.Change plugs,stopped the miss,but still lacked power.I did everything you did,but no better.I took the carb off,cleaned it,blew thru all the passages,run a small wire thru,etc.No better.Took it back off,and cleaned it again,had 1 teeny,tiny passage that actually was stopped up.Took 2 tries cleaning the carb, but that was it. I would bet you have the same problem,as I recall,#2 would foul first.If you have a good ear,as I recall to me,the engine sounded lean.I am not sure why,but I think that passage made fuel be drawn thru a different passage,but at any rate only 2 and 3 would foul.Good luck,let us know what you find.Mark
 
Pull the distributor cap off and make sure the points are opening when pointing to the #2 cylinder. Could have a bad bushing causing them not to open for that one cylinder. Or you could also have a bad distributor cap that is shorted at that point of the cap
 
as I stated before I have confirmed good spark on #2 with spark tester so I have got to assume points are working properly' Tomorrow I will pull the carb and go through it one more time and see what I can find. This evening when I had it running I find that #1 now has little to no change at idle as well as #2 #1 was fine 1 hour before.I did try shorting out #1 & 2  with the rpm,s about 1200 and there was a difference ,but none at idle. I would suspect a head gasket but I have applied compressed air to each and they held with no leakage.

I do appreciate all your help but right now I am leaning towards a blockage in the idle circuit of the carb but I do not know why #3 & #4 are good.
I will keep you posted

Sam
 
The exhaust manifold is bolted to the intake. Where they connect, heat is transferred to allow vaporization of gasoline. This connection has a single layer of cast iron between the exhaust gasses and intake. They do crack in that location, causing a lean condition. Not easy to diagnose or believe in. The manifold must be taken off to test it with a spray of penetrating oil like liquid wrench or PB blaster. A crack will show up on the exhaust side when sprayed in the intake flange. Removing the pipe from the exhaust side will help see. It is a last straw check before pulling the head. I think with a compression check and a leakdown that show good containment that the issue is in the intake, or the distributor cam. If the cam in the distributor can be wiggled in any direction (not in and out) noticeably it is worn and can be the issue, as it changes the timing radically when it runs. Jim
 
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