My 1960 560 LP broke an upper pushrod cup after 20 years of faithful service. While replacing the pushrod, I noticed that valve tip/spring retainer is .150 lower than the 4 valves next to it. That makes me think bent valve. I am familiar with engine building, but not tractor engines. Questions:
1. What is stock piston to valve clearance on these propane engines? (To determine if I can reassemble and crank engine for compression test.)
2. Do the valves tips ever have that much variance in height?
3. Are 1960 valves soft, two piece construction, or prone to breaking if they kiss the pistons and are run.
4. Anyone seen similar, how risky is it to start engine if I cant find any damage or debris?
Thanks.
1. What is stock piston to valve clearance on these propane engines? (To determine if I can reassemble and crank engine for compression test.)
2. Do the valves tips ever have that much variance in height?
3. Are 1960 valves soft, two piece construction, or prone to breaking if they kiss the pistons and are run.
4. Anyone seen similar, how risky is it to start engine if I cant find any damage or debris?
Thanks.