Head Bolt Torque Caterpillar 3406E
Verified Factory Specs
Caterpillar 3406E Cylinder Head Bolt Torque Sequence & Specs
Factory OEM cylinder head bolt torque specifications, 5-stage torque-turn sequence, and tightening patterns for Caterpillar 3406E (5EK/2WS/1MM) diesel engines.
Advertisement
Sponsored Commercial Ad Space
Total Cylinder Head Bolts: 26 Bolts (3/4-16 Grade 8)
Official Factory Tightening Pattern
Center-outward spiral
Step-by-Step Torquing Stages (Follow in Numbered Sequence)
1
Stage 1
Torque bolts 1 through 26 to 200 lb-ft (270 N·m)
2
Stage 2
Re-torque bolts 1 through 26 to 330 lb-ft (450 N·m)
3
Stage 3
Loosen bolts 1 through 26 completely (1 full turn counterclockwise)
4
Stage 4
Torque bolts 1 through 26 to 200 lb-ft (270 N·m)
5
Stage 5
Turn bolts 1 through 26 an additional 90 degrees clockwise (Torque Angle)
⚠️ Master Technician Tip: Clean and blow out all cylinder block bolt blind holes with compressed air. Lightly lubricate bolt threads and under-head flanges with clean engine oil before installation.
OEM Specification Source: Caterpillar Service Manual SENR5580 (3406E Diesel Truck Engine Specifications)
Caterpillar 3406E 5-Stage Cylinder Head Torquing Protocol
- Stage 1: Torque bolts 1 through 26 to 200 lb-ft (270 N·m) in numbered sequence.
- Stage 2: Re-torque bolts 1 through 26 to 330 lb-ft (450 N·m) in numbered sequence.
- Stage 3: Loosen all bolts 1 through 26 completely (1 full turn counterclockwise).
- Stage 4: Re-torque bolts 1 through 26 to 200 lb-ft (270 N·m) in numbered sequence.
- Stage 5: Turn all bolts 1 through 26 an additional 90 degrees clockwise (Torque Angle).
Advertisement
Sponsored Commercial Ad Space
Related Heavy Diesel Engineering Tools
Cross-reference other factory specifications and diagnostic tools for commercial diesel engines:
Technical Reference Citation: Caterpillar Service Manual SENR5580 (3406E Diesel Truck Engine Specifications)