Detroit Diesel — Installation of the DD15 Cylinder Head
Installation
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- ENGINE EXHAUST — operate the engine in a well-ventilated area.
Procedure
- Inspect head bolt holes for oil, water, dirt or damaged threads.
- Verify cylinder liner protrusion heights are all the same.
- Install Cylinder Head Guide Studs tool (J-35784).
- Position a new cylinder head gasket onto engine block.
- Install four lift hooks onto cylinder head.
- Lift the cylinder head into position using tool W470589006200 over guide studs and dowel pins.
- Remove the guide studs and lifting hooks.
- Coat threads and undersides of bolt heads with clean engine oil.
- Install the 40 cylinder head bolts.
- Torque the 38 large bolts in four steps: 50 N·m, 250 N·m, 90° torque turn, 90° torque turn.
- Torque the small bolts (39 and 40) to 60 N·m.
- Install camshaft housing, camshaft assemblies, and time camshaft assembly.
- Install rocker shaft assembly.
- Set valve lash and engine brake; fill the cooling system and prime lubrication system.
- Start engine and check for fuel, coolant or oil leaks.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Large bolts (38): 50 N·m, 250 N·m, 90°, 90°
- Small bolts 39 and 40: 60 N·m (44 lb·ft)
Source: Detroit Diesel 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.