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Re: MD compression
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Posted by PASteve on February 03, 2004 at 16:22:35 from (24.236.111.64):
In Reply to: MD compression posted by Ray on February 03, 2004 at 15:06:25:
The fact that there is so much variation in compression indicates a problem. 40 psig is definitely too low. I'm also assuming that these readings were taken with the lever set to run on gas. 120 psig should be more than enough to run on gas. I'm not sure what compression should be at cranking speed with the lever back. Keep in mind that the compression ratio changes when the lever is pulled back to run on diesel. When you pull the lever back and close the third valve (the one that exposes the spark plug), you're increasing the compression ratio. Compression values should be very different with the lever in different positions. As for the timing problem, the MD magneto turns the opposite direction of gas farmalls. I made that mistake once and had no idea what the problem was until I took the cap off and watched the rotor turn. Be patient - they're great tractors Best of luck
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