Detroit Diesel — Pressure Test Cylinder Block (Immersion Method)
Testing & diagnosis
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- Wear eye protection; do not exceed 276 kPa (40 lb/in.2) air pressure.
Procedure
- Make a 1/2 in. steel plate to cover each cylinder bank.
- Use water hole cover plates and gaskets; drill and tap one plate for an air line.
- Ensure seal ring grooves are clean; install new seal rings above the air inlet ports.
- Apply clean engine oil to the seal rings.
- Place liner inserts in counterbores and slide cylinder liners into the block.
- Install new compression gaskets and water hole seal rings.
- Secure plates to block with 11/16 in.-11 bolts and flat washers; tighten to 330-352 N·m.
- Bolt steel plates and rubber gaskets to water inlet and outlet holes to make airtight.
- Seal the aftercooler water inlet adaptor plug in the air box floor.
- Immerse block 20 minutes in water heated to 82-93 C (180-200 F).
- Apply 276 kPa (40 lb/in.2) air pressure to water jackets.
- Visually inspect for bubbles indicating cracks; replace block if cracked.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Plate bolts tightened to 330-352 N·m (250-260 lb·ft)
- Water 82-93 FridayParts $45.52 C (180-200 F)
- Air pressure 276 kPa (40 lb/in.2)
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.