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Category: Duramax LLY

Duramax LLY

Duramax LLY – ENGINE MOUNTING BRACKET/INSULATOR – Installation

Posted on September 6, 2022

1. Position insulator on engine bracket (Figure 2-13). 2. Install engine bracket and insulator. Tighten engine bracket-to-block bolts to 30 lb-ft (41 N.m) torque. Tighten…

Duramax LLY

Duramax LLY – ENGINE MOUNTING BRACKET/INSULATOR – Removal

Posted on September 6, 2022September 6, 2022

1. Remove fan and clutch as assembly. 2. Remove nuts/bolts attaching front propeller shaft center bearing to bracket. 3. Mark front propeller shaft U-joint and…

Duramax LLY

Duramax LLY – DIESEL ENGINE IN-VEHICLE SERVICE

Posted on September 6, 2022

General Information The repair procedures described in this section cover engine service that can be performed in the vehicle. Engine removal is not required. Left/Right…

Duramax LLY

Duramax LLY – Turbocharger Diagnosis – Blue Exhaust Smoke with Warm Engine Only

Posted on September 6, 2022

POTENTIAL CAUSE 1. Insufficient intake air volume. 2. Partially plugged oil drain tube. 3. Oil Leaking past worn compressor or turbine side seals. 4. Engine…

Duramax LLY

Duramax LLY – Turbocharger Diagnosis – Turbocharger Noise

Posted on September 6, 2022

POTENTIAL CAUSE 1. Obstruction in air intake or outlet systems may cause high pitch whine. 2. Compressor/turbine impeller contacting housing, or other internal damage. May…

Duramax LLY

Duramax LLY – Turbocharger Diagnosis – Low Power, Poor Acceleration (Black smoke evident at 3/4 to wide open throttle)

Posted on September 6, 2022

POTENTIAL CAUSE 1. Air filter plugged. 2. Restriction in air intake duct to turbocharger compressor wheel. 3. Air leak in turbocharger compressor inlet and outlet…

Duramax LLY

Duramax LLY – Turbocharger Diagnosis – Low Power Poor Acceleration (Black smoke not evident at 1/2 to wide open throttle)

Posted on September 6, 2022

POTENTIAL CAUSE 1. Lean fuel mixture caused by insufficient fuel volume or pressure. CORRECTION 1. Problem is in fuel delivery system. Check fuel supply pump…

Duramax LLY

Duramax LLY – TURBOCHARGER OPERATION – Turbocharger Installation

Posted on September 6, 2022

1. Install new O-ring seal on turbocharger manifold outlet. Do not reuse old O-ring as leakage may occur. 2. Clean gasket surfaces of intake manifold…

Duramax LLY

Duramax LLY – TURBOCHARGER OPERATION – Turbocharger Removal

Posted on September 6, 2022

1. Remove front console, rear console, engine cover, and disconnect related wiring and A/C ducting. 2. Remove turbocharger heat shielding. 3. Loosen clamps attaching turbocharger…

Duramax LLY

Duramax LLY – TURBOCHARGER OPERATION – Boost Pressure Test

Posted on September 6, 2022

Boost pressure is checked with a compound vacuum/pressure gauge. A road test under boost conditions is required. Procedure is as follows: 1. Attach compound gauge…

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