Gravely Model L Low Compression

[dunoon2]

Hi, I've owned this tractor for over 30 years and it has never given me any problems. Starts first or second pull after setting all winter. The other day while mowing I hit a hidden rock and it stopped imedently . Trying to start it it seemed that the compression was lower than normal. I pulled the head to see if anything was amiss, everything looked and acted normal. Before I tear into this does anyone have any idea where to look? Thanks

Rich Davis
3-m's
Mobile Mower Maintenance Service

[38racing]

i once had a tiller bounce and exhaust valve retainer came off.

[bobodu]

If this is the Gravely T head engine,the valve lash is .012 for both cold. I fear you may have bent a stem.
https://www.gravelymanuals.com/pdf/Model_L_CSD_19660100.pdf
https://www.gravelymanuals.com/pdf/Conv_76_Shop_Man_19741100.pdf