Remove/install piston - AR03.10-P-7021MCC

ENGINES 132.9 in MODEL 451.3/4 

Fig 1: Identifying Piston Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Removing
1	Remove engine with transmission	Only if the engine is removed and should be fixed onto an engine repair stand. * not for USA Engine 132.910	AR01.10-P-2401MCC
		* not for USA Engine 132.930	AR01.10-P-2401MCB
		* for USA only	AR01.10-P-2401MCU
2	Remove flywheel	Only if the engine is removed and should be fixed onto an engine repair stand. * not for USA	AR03.30-P-8002MCC
		* for USA only	AR03.30-P-8002MCU
3	Fix engine onto an engine repair stand	Only if the engine is removed and should be fixed onto an engine repair stand. Engine repair stand Universal mount
4	Remove cylinder head	* not for USA	AR01.30-P-5800MCC
		* for USA only	AR01.30-P-5800MCU
5	Check markings on the piston (7), clean piston crown if necessary and make markings with a colored pencil	In case of used pistons (7), the markings may no longer be visible due to carbonization. For this reason, remove carbon deposits from pistons (7). If the markings on the pistons (7) are no longer visible, the pistons (7) must be marked again.
6.1	Lower vehicle with vehicle lift	If engine installed.
6.2	Turn engine at engine repair stand until the connecting rod bearing cap (3) is accessible	For a removed engine.
7	Mark connecting rod (2) and connecting rod bearing cap (3) relative to each other	The connecting rods (2) and connecting rod bearing caps (3) are cracked and must not be mixed up with each other.
8	Remove bolts (1)
9	Remove connecting rod bearing cap (3) and connecting rod bearing shells (5) from the crankshaft (6)	If worn connecting rod bearing shells (5) are reused these must remain assigned to the respective connecting rod (2) or connecting rod bearing cap (3).
10	Remove piston (7) with connecting rod (2) and connecting rod bearing shell (4) from cylinder bore (9)	If worn connecting rod bearing shells (4) are reused these must remain assigned to the respective connecting rod (2) or connecting rod bearing cap (3).
11	Remove plain compression ring (10), taper-faced ring (11) and three-piece oil ring (12) on piston (7)		AR03.10-P-7311MCC
12	Remove piston (7) from connecting rod (2)		AR03.10-P-7021-07MCC
		Assembly tool	Fig 2
	Install
13	Attach piston (7) to connecting rod (2)		AR03.10-P-7021-08MCC
		Assembly tool	Fig 2
14	Clean and lubricate cylinder bores (9), connecting rod bearing journals, connecting rod bearing shells (4, 5) and pistons (7)
15	Install plain compression ring (10), taper-faced ring (11) and three-piece oil ring (12) on piston (7)		AR03.10-P-7311MCC
16	Position plain compression ring (10), taper-faced ring (11) and three-piece oil ring (12) on piston (7)		AR03.10-P-7311-03MCC
17	Place tensioning strap (8) on the piston (7) and stretch	Do not turn plain compression ring (10), taper-faced ring (11) and three-piece oil ring (12) anymore. Tensioning strap	Fig 3
18	Assign connecting rod bearing shells (4, 5)	When using new connecting rod bearing shells (4, 5).	AR03.10-P-6112-01MCC
19	Insert connecting rod bearing shells (4, 5) into connecting rod (2) and into connecting rod bearing cap (3).
20.1	Turn engine at engine repair stand through 90°	For a removed engine.
20.2	Raise vehicle with vehicle lift	If engine installed.
21	Assign piston (7) to cylinder bore (9)
	Assignment of pistons to cylinder bore		AH03.10-P-0001-02MCC
22	Insert connecting rod (2) with piston (7) and connecting rod bearing shell (4) in the respective cylinder bore (9)	If necessary turn the crankshaft (6) so that the connecting rod (2) is not touching the connecting rod journal before inserting the piston (7). Ensure that the connecting rod bearing shell (4) does not fall out. Tensioning strap	Fig 3
23	Place connecting rod bearing cap (3) with connecting rod bearing shell (5) in place	Observe marking of connecting rod (2) relative to connecting rod bearing cap (3).
24	Lubricate bolts (1) and screw in	Replace bolts (1).
			*BA03.10-P-1001-01K
25.2	Turn engine at engine repair stand through 90°	For a removed engine.
25.1	Raise vehicle with vehicle lift	If engine installed.
26	Rotate crankshaft (6) fully and inspect clearance
27	Install cylinder head	* not for USA	AR01.30-P-5800MCC
		* for USA only	AR01.30-P-5800MCU
28	Remove engine from engine repair stand	For a removed engine.
29	Install flywheel	For a removed engine. * not for USA	AR03.30-P-8002MCC
		* for USA only	AR03.30-P-8002MCU
30	Install engine with transmission	For a removed engine. * not for USA Engine 132.910	AR01.10-P-2401MCC
		* not for USA Engine 132.930	AR01.10-P-2401MCB
		* for USA only	AR01.10-P-2401MCU

CONNECTING ROD

Number	Designation			Engine 132.9
BA03.10-P-1001-01K	Bolt, connecting rod bearing cap to connecting rod	Stage 1	Nm	15
		Stage 2	∠ °	90

Fig 2: Identifying Assembly Tool (132 589 00 35 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Tensioning Strap (450 589 00 14 00)

Courtesy of MERCEDES-BENZ USA