Caterpillar 3406C Marine Engine — Install Cylinder Head Assembly
Repair & overhaul
For the Caterpillar 3406C Marine Engine, from the Caterpillar service manual.
Applies to: Caterpillar 3406C engine
Before you start
- Do not put the cylinder head assembly down on a flat surface; fuel injection valves can be damaged.
Procedure
- Clean spacer plate and cylinder head bottom surface; install new head gasket, seals (1) and two O-ring seals (2).
- Fasten a hoist, and put cylinder head assembly (3) in position on the cylinder block.
- Put 6V-4876 Molycoat Paste Lubricant on bolt threads and between washer and underside of bolt heads.
- Tighten bolts 1 through 14 in sequence to 270 ± 25 N·m.
- Tighten bolts 1 through 14 to 470 ± 20 N·m.
- Tighten bolts 1 through 14 again to 470 ± 20 N·m by hand.
- Install the rocker shaft assemblies and push rods.
- Tighten bolts 15 through 26 to 270 ± 25 N·m, then to 470 ± 20 N·m twice.
- Tighten the (3/8 in) bolts to 45 ± 7 N·m.
- Adjust valves to 0.38 mm inlet and 0.76 mm exhaust; tighten locknuts to 28 ± 4 N·m.
Tools required
- Hoist Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 270 ± 25 N·m (200 ± 20 lb ft)
- 470 ± 20 N·m (345 ± 15 lb ft)
- 45 ± 7 N·m (33 ± 5 lb ft)
- inlet 0.38 mm (.015 in)
- exhaust 0.76 mm (.030 in)
Full service-parts list: Caterpillar 3406C engine →
Source: Caterpillar service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.