Detroit Diesel — Disassemble and Assemble Booster Servomotor
Repair & overhaul
From a Detroit Diesel service manual — check it applies to your exact model before use.
Procedure
- Thoroughly clean the exterior with grease solvent and dry with compressed air.
- Remove the four cap screws and lock washers securing the cylinder head at the oil end; remove cylinder head, gasket and spring.
- Remove the four cap screws and lock washers securing the cylinder head at the air end; remove cylinder head and gasket.
- Remove split pin and castle nut securing washer, washer seal, piston and washer to the piston rod; remove.
- Remove the piston rod and oil piston assembly.
- Press out the piston rod oil seal from the air end of the power cylinder.
- Clean all components in suitable solvent and dry; clean the washer seal and oil seal in a non-petroleum based cleaner.
- Inspect all components for damage and wear and inspect the outlet and inlet check valve assemblies; replace damaged or worn parts and gaskets.
- Lightly coat the inside of the power cylinder with governor oil and assemble in reverse order of disassembly.
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.