1966 GMC Truck Series 4000-6500 Service Manual
- Year
- 1966
- Make
- GMC
- Vehicle
- Medium Duty Trucks, Trucks
- Type
- Service Manual
- Models
- GMC Truck Series 4000 thru 6500, including L3500 (L, E, H, S, P series)
- Publication
- X-6733
- Pages
- 507
Service manual X-6733 for 1966 GMC Truck Series 4000 thru 6500, including the L3500, published by GMC Truck & Coach Division. It gives on-the-vehicle maintenance, adjustment, light repair and unit replacement for conventional cab, tilt cab, forward control and cowl chassis with gasoline in-line, V6 and Toro-Flow diesel engines. A model data table lists engine, clutch, axle and transmission by series. Sections run from 0 Lubrication to 13 Radiator and Surge Tank, with service diagnosis charts and specifications at the end of most sections and a special tools list at the back. Major unit overhaul is covered in separate unit overhaul manuals, and driver operation in the owner's and driver's manual.
Section 0 · Pages 8–25 (18 pages)
Lubrication
Lubrication charts for conventional and steel tilt cab models, each with a numbered data table giving fitting counts, lubricant symbol and mileage interval. Covers capacities, engine oil recommendations and viscosities, oil filters, air cleaners, crankcase ventilation, multi-purpose gear lubricant, chassis lubricant, wheel bearing grease, brake fluid and other lubricants by symbol.
What this section covers
- Lubrication charts and intervals
- Capacities: crankcase, transmission, rear axle
- Engine oil and viscosities
- Air cleaners and crankcase breather
- Multi-purpose gear lubricant (MP)
- Chassis, wheel bearing and special greases







