Original 1997 [dated 9/97] Cummins Engine Troubleshooting and Repair Manual. This Service/Shop Manual covers the L10G [Natural Gas] Engines. This is what Dealers used to service and repair your vehicle with these Engines. This Manual provides instructions for troubleshooting and repairing these Engines in the Chassis. Very hard to find and useful tool with tons of information, procedures, specifications, diagnostic and illustrations. It is in good condition with minor wear and soiling [see photos]. Bulletin No. 3666207-00