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No. 3 misssing

D

donharmon

Member
Working on a 1950s oc3 oliver crawler, looks like no. 3 is not firing. Have new plugs, spark to the plug but still misses. Compression show 90 lbs. Whats next, any ideas??
 
Switch holes with the sparkplug on #3 for it could be bad even new. If that does not work switch the wire with another one for it could be the wire. For with the compression you have it should fire.
 
I do have fire to the plug and have checked all the wires and have made the switcheroo a couple times to no avail. Possibly a stuck valve?? I don't know. Has me somewhat stumped at this time?
 
[Yes ,thats true, not sure what is next? Will buy a new set of wires and see if that helps??Thnks for the reply
 
(quoted from post at 16:45:35 03/01/15) [Yes ,thats true, not sure what is next? Will buy a new set of wires and see if that helps??Thnks for the reply
Click to expand...

Take the valve cover off and check for proper lift on the cam.

Could have one lobe wore off.
 
Low compression on that cylinder will cause that as will la valve that is not opening or closing as it should. A bad new plug can cause that even with it having spark out of the engine. Even a clogged up intake port will cause that or a clogged up exhaust port. Found more then one dirt dubber nest in manifolds over the years
 
Took manifold off, all is clear, guess the side cover is next to check for valve opening as number 3 has a 95 lbs compression, still somewhat stumped
 
Well, could have been a bad sparkplug wire, spark plug as I put a couple new ones in, bad contact in the distributer where wire meets bottom of hole ,not sure but don't care at this point as it runs super?? Thnks for all replies
 
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