Series 55 – Section 12.1 Tune-Up Procedures of Engine

Section 12.1
Tune-Up Procedures of Engine

Since the engine is electronically governed and the Electronic Unit Pump (EUP) is electronically controlled, it is unnecessary to perform engine speed adjustments.‪

To avoid injury from accidental engine startup while servicing the engine, disconnect/disable the starting system.‪

To avoid injury from contact with rotating parts when an engine is operating with the air inlet piping removed, install an air inlet screen shield over the turbocharger air inlet. The shield prevents contact with rotating parts.‪

NOTICE:
To prevent possible damage, do not perform engine tune-up procedures or engine repair without first disconnecting the engine cranking motor and/or batteries.‪

The turbocharger compressor inlet shield, J 26554-A, must be used anytime the engine is operated with the air inlet piping removed. See Figure "Turbocharger Compressor Inlet Shield" .‪

Figure 1. Turbocharger Compressor Inlet Shield

The shield helps prevent foreign objects from entering and damaging the turbocharger and will prevent the mechanic from accidentally touching the impeller. ‪

The tune-up procedure consists of intake and exhaust valve clearance adjustments. These adjustments should be made with the engine cold. Refer to "12.2 Adjustments of Valve Lash" .‪