159215-0200 ZEXEL 9 421 610 115 BOSCH COILED SPRING 9421610115 1592150200 5157230390

(1) Large bolts (3/4 inch). Put 6V4876 Molycoat on all bolt threads and under all bolt heads. Tighten the bolts in the following step sequence:Step 1. Tighten bolts from 1 through 20 in number sequence to ... 270 25 N m (200 20 lb ft)Step 2. Tighten bolts from 1 through 20 in number sequence to ... 450 20 N m (330 15 lb ft)Step 3. Tighten bolts from 1 through 20 in number sequence again to ... 450 20 N m (330 15 lb ft)Step 4. Install the rocker arm shafts for the engine valves.Step 5. Tighten bolts from 21 through 26 in number sequence to ... 270 25 N m (200 20 lb ft)Step 6. Tighten bolts from 21 through 26 in number sequence to ... 450 20 N m (330 15 lb ft)Step 7. Tighten bolts from 21 through 26 in number sequence again to ... 450 20 N m (330 15 lb ft)Step 8. Tighten the twelve small bolts (2) to ... 45 7 N m (33 5 lb ft)(2) Small bolts (3/8 inch). See Step 8 above.(3) Torque for twelve studs in cylinder head ... 30 5 N m (22 4 lb ft) (4) Thickness of cylinder head (new) ... 112.78 0.25 mm (4.440 .010 in) Minimum permissible thickness of cylinder head ... 111.51 mm (4.390 in)(5) Torque for six studs that hold fuel line adapter locks ... 30 5 N m (22 4 lb ft) Flatness of the cylinder head should be within 0.13 mm (.005 in) total, and a maximum of 0.03 mm (.001 in) for any 76.2 mm (3.00 in) span.
When the cylinder head is installed on an engine with a water cooled exhaust manifold, plug (A) MUST be removed to prevent damage to the water cooled exhaust manifold. If the engine has a dry exhaust manifold, plug (A) MUST NOT be removed.