Detroit Diesel — Removal of Cylinder Head
Repair & overhaul
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- HOT COOLANT: never remove cooling system pressure cap while engine is at operating temperature.
- Do not place the head mating surface down on a flat surface; fuel injector nozzles protrude slightly.
- Do not move the thrust bolt on the transfer-tube.
Procedure
- Drain the coolant from the radiator.
- Remove the trim cover frame.
- Remove the rocker arm assembly; mark valve bridges and pushrods in order.
- Remove the EGR cooler support bracket.
- Remove the air intake manifold.
- Remove the high-pressure fuel line and transfer tube.
- Cover the openings in the unit to prevent dirt entry.
- Remove the turbocharger from the exhaust manifold.
- Disconnect fuel return, constant throttle, and coolant lines from cylinder head; discard seal rings.
- Loosen and remove cylinder head bolts using head bolt impact socket J-45389.
- Remove cylinder head and set it on wooden blocks or on its side.
- Remove and discard the head gasket from the block.
- Clean cylinder head contact surfaces, block surfaces, and cylinder interior.
- Check cylinder head surface for warpage and inspect for cracks.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Head warpage limit over 150 mm (6 in.): 0.15 (0.006) mm (in.)
- Cylinder head bolt shaft length when new 210.0 mm (8.27 in.); maximum 212.0 mm (8.35 in.)
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.