Posted by PaulW_NJ on August 16, 2008 at 19:23:12 from (72.76.239.189):
I recently had the head from my 240U rebuilt by a reputable machine shop. New valves, seats, guides, springs. I bought the tractor last year, and while it hardly smoked at all,it ran very rough. I discovered it had a frozen intake valve, which had caused several bent valve push rods.
Here are the compression tests before the head rebuild. The first column is dry, the second after oil injected:
1 130 160 2 0 0 3 125 160 4 145 170
Just started it after the rebuild. The engine now smokes like a locomotive. Cars going past slow down to see where the fire is. Runs very smooth, but spraying unburned oil out of the stack. Everything is covered with droplets of unburned oil. Doesn"t smoke for first 30 seconds, but then smokes like crazy, idle and load. Plugs are wet, black,and very oily. Have only run engine for less that 15 minutes.
New compression tests:
1 115 130 2 120 130 3 135 145 4 138 145
Blow down test:
1 15% 2 15% 3 4% 4 10%
Why should it go from no smoke, to a serious smoking problem? Before I go back to the machinist, could the head gasket have somehow broken during installation? Anything else I should check? Looking for answers.
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