Detroit Diesel — Pressure (Leakage) Test Procedure Engine Crankcase
Testing & diagnosis · crankcase cooling system
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- Do not loosen or remove any injection nozzles from the cylinder head while the cooling system is under pressure.
Procedure
- Drain all lube oil and coolant from engine and radiator.
- Disconnect the radiator from the engine and cap off all the engine connections.
- Disconnect the unit's cab heater connections at the engine and cap engine openings.
- Disconnect air compressor coolant supply and discharge line, then cap lines at engine.
- Remove the valve cover/intake manifold and lube oil pan.
- Fill the engine with water and attach an air line connection with regulator to the water drain in cylinder block.
- Pressurize the crankcase cooling system to 30 lb/in.2 and maintain until leakage location is evident.
- Identify all points of leakage prior to teardown and repair.
Specs & values
- 30 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.