3408 VEHICULAR ENGINE Caterpillar


Cylinder Heads

Usage:

(1) Large bolts (3/4 inch). Put engine oil on all bolt threads and tighten the bolts in the step sequence that follows.

Step 1. Tighten bolts from 1 to 14 in number sequence to ... 200 ± 20 lb. ft.(270 ± 25 N·m)

Step 2. Tighten bolts from 1 to 14 in number sequence to ... 330 ± 15 lb. ft.(447 ± 20 N±m)

Step 3. Tighten bolts 1 to 14 in number sequence again to ... 330 ± 15 lb. ft.(447 ± 20 N·m)

Step 4. Install the rocker arms for the engine valves.

Step 5. Tighten bolts from 15 to 18 in number sequence to ... 200 ± 20 lb. ft.(270 ± 25 N·m)

Step 6. Tighten bolts 15 to 18 in number sequence to ... 330 ± 15 lb. ft.(447 ± 20 N·m)

Step 7. Tighten bolts from 15 to 18 in number sequence again to ... 330 ± 15 lb. ft.(447 ± 20 N·m)

Step 8. Tighten the nine small bolts (2) to ... 32 ± 5 lb. ft.(43 ± 7 N·m)

(2) Small bolts (3/8inch). See Step 8, above.

(3) Torque for eight studs in each cylinder head ... 20 ± 3 lb. ft.(25 ± 4 N·m)

(4) Thickness of cylinder head (new) ... 4.440 ± .010 in.(112.78 ± 0.25 mm)

Minimum permissible thickness of cylinder head ... 4.390 in.(111.51 mm)

NOTE: Flatness of the cylinder head should be within .005 in. (0.13mm) total, and a maximum of .001 in. (0.025 mm) for any 3.00 in. (76.2 mm) span.

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