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Need to get this engine running,and I am stuck!!

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chadd

08-11-2007 10:51:59




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I am still working on the C-153 engine for our combine. It only seems to run on two or three cylinders, lacks power, and just plain runs rouqh. The firing ends of the spark plugs from cylinders 1 and 2 are still white with some light brown and and the ends of the plugs on cylinders 3 and 4 are still covered with dark black, dry soot. If I switch the plugs around, they will change color within 20 seconds of running. I turned the motor over with a plug grounded against the block on each wire and each cylinder seems to have spark. I also tried to determine which cylinder(s) are the culprit by shorting out each of the plugs (one at a time). It seemed to run worse regardless of which one I shorted out, although it was hard to tell. I thought maybe the manifold passages were plugged, but that doesn"t seem to be the case either, as all of the exhaust and intake passages are clear in the head and manifold (I used compressed air, light, and a piece of wire to triple check). I did not see any missing pieces of the manifold gaskets or cracks in the manifold, so it seems unlikely that the intake is the culprit either. Does anyone have any other ideas?
Thanks.

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A. Bohemian

08-11-2007 09:28:39




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 Questions, Questions... in reply to chadd, 08-11-2007 10:51:59  
What does the exhaust look like?



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Jon Heili

08-11-2007 14:27:48




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 Re: Need to get this engine running,and I am stuck!! in reply to chadd, 08-11-2007 10:51:59  
try spraying starting fluid around intake manifold while its running, you will find out if there is a leak.



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El Toro

08-11-2007 11:27:49




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 Re: Need to get this engine running,and I am stuck!! in reply to chadd, 08-11-2007 10:51:59  
Make sure your plug wires aren't crossed. If the rotor turns CW your plug wires need to be in firing order. Hal

2-1
4-3



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El Toro

08-11-2007 11:20:34




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 Re: Need to get this engine running,and I am stuck!! in reply to chadd, 08-11-2007 10:51:59  
Hold your hand over the throat of the carburetor and see if there's good suction on your hand. I would double check that intake manifold to make sure it isn't leaking. Check your valve clearance
again and when checking them cold, add .002" to the clearance. You may want to do a compression check and compare the readings. They should be close to one another. We always did these with the throttle in the wide open position. Good compression and intake manifold vacuum are all related to one another. Hal

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