Head Bolt Torque PACCAR MX-13
Verified Factory Specs
PACCAR MX-13 Cylinder Head Bolt Torque Sequence & Angle Specs
Factory OEM cylinder head bolt torque specifications, 4-stage torque-to-yield angle degree sequence, and tightening patterns for PACCAR MX-13 commercial diesel engines.
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Total Cylinder Head Bolts: 38 Bolts (M15 Torque-to-Yield)
Official Factory Tightening Pattern
Center-outward spiral crisscross
Step-by-Step Torquing Stages (Follow in Numbered Sequence)
1
Stage 1
Torque all bolts to 75 ft-lbs (102 N·m)
2
Stage 2
Torque all bolts to 150 ft-lbs (203 N·m)
3
Stage 3
Rotate all bolts 90 degrees clockwise
4
Stage 4
Rotate all bolts an additional 90 degrees clockwise (Final 180° turn)
⚠️ 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: PACCAR Engine Service Manual MX-13 EPA17 (Valve Clearance & Cylinder Head Assembly)
PACCAR MX-13 Cylinder Head Installation Sequence
The PACCAR MX-13 features 38 torque-to-yield cylinder head bolts tightened in a 4-stage center-outward sequence:
- Stage 1: Torque all 38 bolts to 75 ft-lbs (102 N·m) in numbered order.
- Stage 2: Torque all 38 bolts to 150 ft-lbs (203 N·m) in numbered order.
- Stage 3: Turn all 38 bolts 90 degrees clockwise (Torque Angle 1).
- Stage 4: Turn all 38 bolts an additional 90 degrees clockwise (Torque Angle 2 — 180° total).
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Technical Reference Citation: PACCAR Engine Service Manual MX-13 EPA17 (Valve Clearance & Cylinder Head Assembly)