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Farmall & IHC Tractors Discussion Forum
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SW 6 miss or problem

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joel shelton

03-01-2006 19:03:48




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I thought I would ask this here on the forum. I have a 1952 SW6 gas that has a bad miss in it. When I start it up and it idles at a lower RPM everything is fine no miss. When I increase the throttle or put it under a load like pulling my harrows it misses really bad and seems to be coming from the air intake pipe or that area. I still can't pinpoint that area for sure. It has no power to pull when it misses. I have changed the oil in all areas, replaced the spark plugs, rechecked the spark plugs for any issues and saw that there is quite a bit of buildup on them even after less than an hours operation, tried playing with the jets and carb screws to no avail, clean the air intake canister and replaced the oil there too. BTW this problem was happening before I did any of these. At one time the hose coming out of the carb from the air intake was loose and I retighened it. Any ideas? thanks
joel

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Janicholson

03-02-2006 06:48:11




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 Re: SW 6 miss or problem in reply to joel shelton, 03-01-2006 19:03:48  
The ideas below are very good first efforts. If things seem to be the same, pull the dist cap and rotor, grab the dist shaft and move it in all directions (except in and out) if you can detect movement (play in the bearings, it needs to be rebuilt. It is common (recient thread on here ) for the shaft box to be ignored for life, then the shaft life ends. Longer bushings contacting the shaft in new unworn areas can fix even a worn system. Same exact symptoms as described. It causes radicall dwell changes and timing irregularity as the advance mechanism rotates the dist cam. Good hunting,
JimN

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El Toro

03-02-2006 03:26:40




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 Re: SW 6 miss or problem in reply to joel shelton, 03-01-2006 19:03:48  
I would check the valve clearance to see if they're set too tight. The clearance will decrease as the engine heats up. Set them at .020" cold. Hal



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Wayne Swenson

03-01-2006 20:40:29




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 Re: SW 6 miss or problem in reply to joel shelton, 03-01-2006 19:03:48  
Popping in the intake or carb indicates to me intake valve leakage, weak valve spring problems or early timing.
First, make sure the timing is set correctly. Late timing (too small of a gap or incorrect setting) will act like too rich carburetor problems.
Timing should be set so the points open (set the gap first, .016" for battery ignition) when the timing pointer is between the double marks on the pulley; use the crank or turn the fan by hand (switch off) to locate the marks. With the switch off; use an ohmmeter or self powered test light to verify the point opening instant. This can be done with either #1 or #4 at TDC. Loosen the 2 distributor hold-down cap screws and rotate the body of the distributor in the direction of normal rotor travel until the points are closed (test light is on, ohmmeter reads very low ohms). Now rotate the distributor body backwards until the points JUST open; lock the cap screws and you are good to go. It is CRITICAL for the points have to be CLEAN and ADJUSTED first. If you have a 12 volt test light, turn on the switch after locating TDC and follow the same procedure. The light is on with points closed and off when the points open.
Needless to say, points, rotor, cap, & wires have to be in decent shape.

Now start the engine & warm it up in NEUTRAL and BRAKES LOCKED; run at WOT (wide open throttle) and turn the high-speed adjusting screw in & out to find the "sweet spot" where the engine runs its fastest & smoothest. Turn this high-speed screw out an extra 1/2--3/4 turn for power. Idle the engine down & set the idle speed. Now turn the idle mixture screw in to richen, out to lean so the idle is smoothest (this is an AIR adjusting screw so works opposite of the main fuel screw on the bottom of the carb). Re-adjust the idle speed. Perform the carb adjusting procedure another time to be sure all mixtures are correct.
Remove the air intake pipe at the carb & try running the engine as you have described. the pipe or passageway through the aircleaner may be blocked.
Let me know if you need more info.

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