ar0100a0001a

Inspecting engine for dust damage

Type ar · topic 01.00 · version 0101 · 2006-08-04

Applies to: ENGINE 457.939 /945 /946 /949 in MODEL NAB372.124 ENGINE 457.939 /945 in MODEL NAB372.317

Where it sits

Function group 1 Engine › 01 Complete engine, crankcase ventilation, cylinder head, crankcase › 01.00 General — Series 372 (models 124, 317)

EinPAS 15 Engine › 15.15 Combustion engine, complete/engine housing/crank assembly › 15.15.15 internal combustion engine, complete — Series 372 (models 124, 317)

Also applies to engines/gearboxes: 457 939, 457 945, 457 946, 457 949

AR01.00-A-0001A

Inspecting engine for dust damage

18.7.06

ENGINE 457.939 /945 /946 /949 in MODEL NAB372.124

ENGINE 457.939 /945 in MODEL NAB372.317

Removing

If oil consumption is high or if engine has failed, it is often unclear whether dust damage or normal wear exists.

1

Remove pistons

AR03.10-A-7021A

Checking

2

Inspect intake passage between air filter and engine for dust deposits

Severe dust deposits in the elbows of the intake pipes and

hoses are a clear indication of dust damage.

On engines fitted with oil bath air filter, a very fine film is permissible.

3

Inspect pistons and cylinder walls for wear (dust damage)

The stem contact patterns of the pistons and the honing patterns of the cylinders make it possible to recognize damage caused by increased presence of dust.

The cylinder liner and piston must be replaced if worn.

Remove/install/seal cylinder liner

AR01.40-A-9324A

Piston removal and installation

AR03.10-A-7021A

Notes for assessing wear to cylinder wall in the case of dust damage

AH01.40-N-0001-01A

Notes for assessing piston wear from dust/particulate damage

AH03.10-N-0001-01A

Referenced documents