Category Archives: Duramax LLY

NOTE: Cylinders #7 and #8 require 0.013 mm (0.005 in.) additional clearance (piston to bore).

TDC offset must be reprogrammed whenever the PCM, front cover, timing gears, timing chain, crankshaft position sensor, or other components affecting timing are replaced. The procedure for reprogramming TDC offset is as follows: 1. Verify that vehicle batteries are fully charged. 2. Start and run engine at curb idle speed. 3. Continue running engine at… Read More »

1. Apply Permatex High Tack to manifold gaskets and position gaskets on cylinder heads. 2. Install left/right side manifold halves. Tighten attaching bolts/studs to 31 lb-ft (42 N•m) torque. 3. Mount turbocharger or cylinder block, and install attaching bolts, nuts, and brackets. Tighten attaching bolts/nuts to 43 lb-ft (58 N•m) torque. 4. Connect exhaust inlet… Read More »

1. Install damper key in crankshaft (Figure 2-186). 2. Lubricate crankshaft hub, damper seal contact surface, and damper hub bore with engine oil or chassis grease. 3. Align and install damper on crankshaft. 4. Install washer and damper bolt. Tighten bolt 200 lb-ft (270 N•m) torque. Have helper prevent crankshaft from turning with holding tool… Read More »