Hello everyone, new to the forum
Kohler 20hp sv600 courage, ran good. During winter maintenance, replaced head gasket, exhaust port gasket, intake carburetor gasket, valve cover gasket and set valves, replaces push rods to appropriate valves. Cranked mower drove front wheels onto wheel stands and was dropping pto to install new drive belt. However when loosening pto bolt the crank rotated. Also, able to rotate flywheel by hand easily.
References to explanation using time on a clock is the flywheel set at 12:00 o'clock and the piston at TDC.
Cycle 1, TDC, adjusted valves(intake .005, exhaust .007), (down stroke), input valve starts to open just before bottom of stroke, exhaust valve closed.
Cycle 2(upstroke), intake valve finishes opening and closes TDC, exhaust valve remained closed.
Cycle 3(compression down stroke, supposedly), input valve closed. Exhaust valve begins to open, opens fully with slight tension remains on intake valve untill flywheel at 3 o'clock.
Cycle 4(upstroke), intake valve opens slightly and closes quickly, from 7-10 o'clock, exhaust valve closes at 10 o'clock
As I understand,
Cycle 1, TDC, down stroke, input valve opens.
Cycle 2, upstroke input valve closes and compresses air/gas.
Cycle 3, TDC, spark plug ignites down stroke.
Cycle 4, upstroke exhaust valve opens and closes at the top of the stroke.
Seems like valves acting like timing 180 degrees off? Installed new flywheel key. The only thing I can think of, is maybe the flywheel was rotated 180 degrees and push rods were installed on the back side of the valve cam/back of lobe on cam? Is this possible? New bolts and head gasket, can I take off the bolts and gasket and reuse without buying another set? Any suggestions and thank you.
Kohler 20hp sv600 courage, ran good. During winter maintenance, replaced head gasket, exhaust port gasket, intake carburetor gasket, valve cover gasket and set valves, replaces push rods to appropriate valves. Cranked mower drove front wheels onto wheel stands and was dropping pto to install new drive belt. However when loosening pto bolt the crank rotated. Also, able to rotate flywheel by hand easily.
References to explanation using time on a clock is the flywheel set at 12:00 o'clock and the piston at TDC.
Cycle 1, TDC, adjusted valves(intake .005, exhaust .007), (down stroke), input valve starts to open just before bottom of stroke, exhaust valve closed.
Cycle 2(upstroke), intake valve finishes opening and closes TDC, exhaust valve remained closed.
Cycle 3(compression down stroke, supposedly), input valve closed. Exhaust valve begins to open, opens fully with slight tension remains on intake valve untill flywheel at 3 o'clock.
Cycle 4(upstroke), intake valve opens slightly and closes quickly, from 7-10 o'clock, exhaust valve closes at 10 o'clock
As I understand,
Cycle 1, TDC, down stroke, input valve opens.
Cycle 2, upstroke input valve closes and compresses air/gas.
Cycle 3, TDC, spark plug ignites down stroke.
Cycle 4, upstroke exhaust valve opens and closes at the top of the stroke.
Seems like valves acting like timing 180 degrees off? Installed new flywheel key. The only thing I can think of, is maybe the flywheel was rotated 180 degrees and push rods were installed on the back side of the valve cam/back of lobe on cam? Is this possible? New bolts and head gasket, can I take off the bolts and gasket and reuse without buying another set? Any suggestions and thank you.
Kohler compression problem, post head gasket and valve adjustment
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