SPECIFICATIONS
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441
Figure 441 — Torque Sequence Screw Numbers — Head to Block
Cylinder head screws must only be reused four times after initial installation. The number of times a screw has been reused
must be identified by a punch mark on the head of the screw. Screws having four punch marks should not be reused and must
be replaced with new screws.
Screws numbered 1, 2, 3 and 4 in the first sequence (A) are numbered 21, 20, 19 and 22 respectively in the second sequence
(B).
Step 1. First sequence (A): screws 1–4 25 N•m (18 lb-ft)
Step 2. Second sequence (B): screws 1–26 65 N•m (48 lb-ft)
Step 3. Repeat second sequence (B): screws 1–26 65 N•m (48 lb-ft)
Step 4. Angle tighten: screws 1–26 120° ±5°
Step 5. Angle tighten: screws 1–26 90° ±5°
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