Check cylinder barrel for wear and damage

AR01.40-W-0003B

25.06.2019

Engine	900.9 in model 375.1, 970, 972, 975, 976
Engine	902.9 in model 375.1, 970, 972, 974, 975, 976
Engine	902.9 in model 375.3, 950, 952, 953, 954, 957
Engine	904.9 in model 374
Engine	904.9 in model 375.1, 970, 972, 975, 976
Engine	906.9 in model 374.5, 375.3, 950, 952, 953, 954, 957
Engine	906.9 in model 970, 972, 974, 975, 976
Engine	924.9 in model 970, 972, 974, 975, 976
Engine	925.9 in model 970, 972, 974
Engine	926.9 in model 950, 952, 953, 954, 957

	Check
1	Remove cylinder head	Engine 900.9, 924.9, 925.9 engine 902.9, 926.9 except in model 957	AR01.30-W-5800J
		Engine 904.9, engine 906.9 without code MS8 (Natural gas engine)	AR01.30-W-5800A
		Engine 902.9, 906.9 in model 957 with code MS8 (Natural gas engine)	AR01.30-W-5800H
		Engine 902.9 in model 957 without code MS8 (Natural gas engine), engine 926.9 in model 957	AR01.30-W-5800JB
2	Clean crankcase sealing surface
Topical note	Information on working sealing surfaces when carrying out engine repairs		AH01.10-N-0002-01A
3	Rotate crankshaft until piston of cylinder to be checked is positioned at BDC to be able to assess the honing pattern in the cylinder barrel through visual inspection
	Notes for evaluation of a cylinder barrel		AH01.40-N-0001-03A
		If honing pattern cannot be assessed clearly:
		
		Measure cylinder bores.
		Engine 900.9, 924.9, 925.9, 926.9, engine 902.9 without code MS8 (Natural gas engine)	AR01.40-W-9202J
		Engine 904.9, 906.9, engine 902.9 with code MS8 (Natural gas engine)	AR01.40-W-9202A
4	Check piston crown by means of visual inspection for damage
	Notes on the assessment of pistons and piston rings		AH03.10-N-0001-04A
		If damage on the piston crown was established:
		
		Install new piston.
		Engine 900.9, 924.9, 925.9, 926.9, engine 902.9 without code MS8 (Natural gas engine)	AR03.10-W-7021J
		Engine 902.9 with code MS8 (Natural gas engine), engine 904.9, 906.9	AR03.10-W-7021A
5	Install cylinder head	Engine 900.9, 924.9, 925.9 engine 902.9, 926.9 except in model 957	AR01.30-W-5800J
		Engine 904.9, engine 906.9 without code MS8 (Natural gas engine)	AR01.30-W-5800A
		Engine 902.9, 906.9 in model 957 with code (MS8) Natural gas engine	AR01.30-W-5800H
		Engine 902.9 in model 957 without code MS8 (Natural gas engine), engine 926.9 in model 957	AR01.30-W-5800JB

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