Detroit Diesel — Measurement of Cylinder Liner Protrusion
Testing & diagnosis
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- Correct cylinder liner protrusion is necessary to obtain a perfect seal when the head gasket is compressed by the cylinder head.
- There are three different cylinder liner shim thicknesses available: 0.15 mm, 0.30 mm, and 0.50 mm.
Procedure
- Clean contact surfaces of cylinder block, cylinder liner, and measuring plate.
- Install liner and shim into block without seals.
- Install measuring plate J-46180 on block and liner; fasten with cylinder head bolts through spacers.
- Tighten cylinder head bolts 50 N·m (37 lb·ft).
- Install dial gauge with feeler in slot and touching block surface with preload; support gauge.
- Measure protrusion at four slots; record readings.
- Set dial gauge zero; move feeler to liner collar and record.
- Repeat for each slot until four measurements.
- If any protrusion is less than 0.230 mm or more than 0.330 mm, remove liner and inspect.
- Compare four measurements; if difference exceeds 0.02 mm, replace liner and repeat steps a–e.
- Remove bolts, spacers, and measuring plate.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Cylinder liner protrusion from block 0.230–0.330 mm (0.0090–0.0130 in.)
- Difference between four measuring points max 0.02 mm (0.0007 in.)
- Cylinder head bolts 50 N·m (37 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.