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Remove/Install Piston - AR03.10-P-7021MR

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Engine 133 in model 117, 156, 176 

Engine 270 in model 117, 156, 176, 242, 246 

Engine 274.9 in model 172, 204, 205, 207, 212, 218, 253 

G14547556Courtesy of MERCEDES-BENZ USA

Shown on piston crown (5a) with travel direction arrow (D) 

G14547557Courtesy of MERCEDES-BENZ USA
WARNING Risk of injury.  Moving parts can pinch, crush or, in extreme cases even sever extremities. No parts of the body or limbs should be within the operating area of mechanical components when moving components. AS00.00-Z-0009-01A
CAUTION Risk of injury  to skin and eyes due to handling of engine oil. Risk of poisoning  caused by swallowing engine oil Wear protective gloves, protective clothing and safety glasses.
Do not fill engine oil into beverage containers.		 AS18.00-Z-0001-01A
CAUTION Risk of injury  caused by scraping or cutting body parts on sharp vehicle parts Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.		 AS00.00-Z-0017-01A
Notice  Notes on avoiding damage through contamination and foreign objects   AH00.00-P-5000-01A
REMOVING Remove     
1.1 Remove engine with transmission. Engine 133 in model 117, 156, 176
Engine 270 in model 117, 156, 176, 242, 246
Engine 274 in model 172, 204, 207, 212, 218
Engine 274 in model 205, 253
except code M005 (Vehicles with 4MATIC/all-wheel drive)		  
    Engine 274.9 in model 253
except code M005 (Vehicles with 4MATIC/all-wheel drive)		 AR01.10-P-2401MRB
    Engine 274.9 in model 212
with code 924 (Bivalent natural gas drive)		 AR01.10-P-2401MRC
    Engine 133 in model 117, 156, 176 AR01.10-P-2401MTA
    Engine 270 in model 117, 156, 176, 242, 246.2 AR01.10-P-2401MT
    Engine 274 in model 172 AR01.10-P-2401MRE
    Engine 274.9 in model 205
except code M005 (Vehicles with 4MATIC/all-wheel drive)		 AR01.10-P-2401MRA
    Engine 274 in model 212 except code 924 (Bivalent natural gas drive)
Engine 274 in model 218		 AR01.10-P-2401MRS
    Engine 274 in model 204.9 AR01.10-P-2401MRG
    Engine 274 in model 204 (except 204.9), 207 AR01.10-P-2401MR
1.2 Remove engine from front axle carrier. Engine 274.9 in model 205, 253
with code M005 (Vehicles with 4MATIC/all-wheel drive)		  
    Engine 274.9 in model 253
with code M005 (Vehicles with 4MATIC/all-wheel drive)		 AR01.10-P-2510MRB
    Engine 274.9 in model 205
with code M005 (Vehicles with 4MATIC/all-wheel drive)		 AR01.10-P-2510MRA
2 Remove transmission from engine. Transmission 724.2 in model 205 with engine 274.9 AR27.10-P-0502LWH
    Transmission 724.2 in model 253 with engine 274.9 AR27.10-P-0005LVH
    Transmission 725.0 in model 205, 253 with engine 274.9
except code M005 (Vehicles with 4MATIC/all-wheel drive)		 AR27.10-P-0500MRF
    Transmission 725.0 in model 172 with engine 274.9 AR27.10-P-0500MRE
    Transmission 722.9 in model 172 with engine 274.9 AR27.10-P-0500W
    Transmission 711.6 in model 117, 156, 176, 242, 246 with engine 270 AR26.10-P-0020NKB
    Transmission 711.6 in model 204 with engine 274.9 AR26.10-P-0020SA
    Transmission 711.6 in model 207 with engine 274.9 AR26.10-P-0020CWA
    Transmission 711.6 in model 212 with engine 274.9 AR26.10-P-0020EWG
    Transmission 716.7 in model 172 with engine 274.9 AR26.10-P-0020MRE
    Transmission 716.7 in model 205, 253 with engine 274.9 AR26.10-P-0020LWA
    Transmission 722.9 (except 722.96) in model 205 with engine 274.9 AR27.10-P-0500LWA
    Transmission 722.96 in model 205 with engine 274.9 AR27.10-P-0500LWY
    Transmission 722.9 (except 722.96) in model 207 with engine 274.9 Transmission 722.9 (except 722.96/997) in model 204 with engine 274.9 AR27.10-P-0500CV
    Transmission 722.96 in model 204 with engine 274.9 AR27.10-P-0500CWX
    Transmission 722.9 (except 722.96) in model 212 with engine 274.9
Transmission 722.9 (except 722.96) in model 218 with engine 274.9		 AR27.10-P-0500EV
    Engine 133 in model 117, 156, 176 with transmission 724.0
Engine 270 in model 117, 156, 176, 242, 246 with transmission 724.0		 AR27.10-P-0009NKB
    Transmission 725.0 in model 205, 253 with engine 274.9
with code M005 (Vehicles with 4MATIC/all-wheel drive)		 AR27.10-P-0500LWX
3 Attach load tilter to all existing engine lifting lugs and to engine crane and lift engine from lifting platform. Engine 133 in model 117, 156, 176
Engine 270 in model 117, 156, 176, 242, 246		  
REFER TO SPECIAL TOOLS 000 588 03 62 00 Lifting platform   WS01.00-P-0091A
REFER TO SPECIAL TOOLS 000 588 00 62 00 Load tilter IMPORTANTCommercially available devices/tools 
Engine crane		 WS01.00-P-0102B
4 Attach engine to assembly stand.    
REFER TO SPECIAL TOOLS 000 588 00 31 00 Assembly stand for cars   WS01.00-Z-3028KOB
5 Remove engine crane and load tilter from engine.    
REFER TO SPECIAL TOOLS 000 588 00 62 00 Load tilter IMPORTANTCommercially available devices/tools 
Engine crane		 WS01.00-P-0102B
6 Remove cylinder head. Engine 133 in model 117, 156, 176 AR01.30-P-5800MTA
    Engine 270 in model 117, 156, 176, 242, 246.2 AR01.30-P-5800MT
    Engine 274.9 in model 172 AR01.30-P-5800MRE
    Engine 274.9 in model 205, 253 AR01.30-P-5800MRB
    Engine 274.9 in model 204, 207 AR01.30-P-5800MRA
    Engine 274.9 in model 212, 218 AR01.30-P-5800MRS
7 Remove oil pump. Engine 133 in model 117, 156, 176
Engine 270 in model 117, 156, 176, 242, 246.2		 AR18.10-P-6020MT
    Engine 274.9 in model 172, 204, 207 AR18.10-P-6020MR
    Engine 274.9 in model 205, 253 AR18.10-P-6020MRA
    Engine 274.9 in model 212, 218 AR18.10-P-6020MRS
8 Remove balance shaft housing. Engine 270.920 in model 117, 156, 176, 242, 246
Engine 274.920 in model 172, 204, 205, 207, 212, 218, 253		  
    Engine 270.920 in model 117, 156, 176.04, 246.24 AR03.20-P-1100MT
    Engine 274.920 in model 172, 204, 207, 212, 218 AR03.20-P-1100MR
    Engine 274.920 in model 205, 253 AR03.20-P-1100MRA 
9 Clean sealing surfaces of crankcase. Assembly cleaner *BR00.45-Z-1028-04A 
10 Carefully remove combustion residues at top-land zone of cylinder bores and blow out cylinder bores with compressed air. There must not be any combustion residues remaining in the cylinder bores.
Non-compliance with result in damage to piston rings (6a, 6b, 6c).		  
11 Mark connecting rods (2) relative to respective cylinder. NOTES Do not interchange connecting rods (2).
Engine damage can occur otherwise.		  
12 Apply markings (arrow A) to connecting rod bearing caps (1) and connecting rods (2). NOTES Connecting rods (2) and connecting rod bearing caps (1) are cracked (broken). Do not interchange.
Engine damage can occur otherwise.		  
13 Remove connecting rod bolts (3).    
14 Remove connecting rod bearing caps (1).    
15 Mark installation position of connecting rod bearing shells (4) in connecting rod bearing caps (1) and in connecting rods (2). Only where connecting rod bearing shells (4) are reused.
NOTES Do not interchange connecting rod bearing shells (4), connecting rod bearing caps (1) and connecting rods (2).
Engine damage can occur otherwise.		  
16 Check piston crowns (5a) for existing travel direction arrows (D). If travel direction arrows (D) on piston crowns (5a) are no longer discernible due to contamination and/or carbonization,
↓
Clean the piston crowns (5a).
Assembly cleaner If no travel direction arrows (D) are recognizable after cleaning,		 *BR00.45-Z-1028-04A 
    ↓
Mark piston crowns (5a) with travel direction arrows (D).		  
17 Mark installation position of pistons (5) relative to respective cylinder. Only where pistons (5) are reused.
NOTES Do not interchange pistons (5).
Engine damage can occur otherwise.		  
18 Remove pistons (5) with connecting rods (2) upwards out of crankcase.    
19 Remove connecting rod bearing shells (4) from connecting rod bearing caps (1) and connecting rods (2).    
20 Clamp connecting rods (2) with pistons (5) in vise. IMPORTANT Use protective jaws.  
21 Mark piston pins (8) and connecting rods (2) relative to the pistons (5). Only where pistons (5) are reused.
NOTES Do not interchange piston pins (8), connecting rods (2) and pistons (5).
Engine damage can occur otherwise.		  
22 Remove retaining rings (7). NOTES Perform the work on a clean soft base.
Piston (5) will otherwise be damaged.		  
23 Press piston pins (8) out of pistons (5).    
24 Remove pistons (5) from connecting rods (2).    
25 Remove connecting rods (2) from vise.    
26 Clean all power unit components. NOTES The power unit components must be absolutely free of soiling.
Engine damage can occur otherwise.
Assembly cleaner		 *BR00.45-Z-1028-04A 
INSPECT Check     
27 Check pistons (5) and piston rings (6a, 6b, 6c) for wear and damage.
Notes on the assessment of pistons and piston rings		 Where pistons (5) and piston rings (6a, 6b, 6c) are reused.
↓
If problems occur,
↓
Replace pistons (5) and/or piston rings (6a, 6b, 6c).		 AH03.10-P-0001-04MM 
    Remove/install piston rings AR03.10-P-7311MR 
28 Check piston rings (6a, 6b, 6c) for dimensional accuracy. Only where piston rings (6a, 6b, 6c) are reused.
IMPORTANTCommercially available devices/tools 
Outside micrometer
Engine 133 in model 117, 156, 176 Engine 270 in model 117, 156, 176, 242, 246 Engine 274.9 in model 172, 204, 205, 207, 212, 218, 253Dimension If problems occur,
↓
Install new piston rings (6a, 6b, 6c) and pistons (5).		 *BE03.10-P-1003-05L 
      AR03.10-P-7311MR 
29 Check side clearance of the piston rings (6a, 6b, 6c). Only where pistons (5) are reused with already used piston rings (6a, 6b, 6c). AR03.10-P-7311-01MR 
    IMPORTANTCommercially available devices/tools 
Feeler gauge		  
    Engine 133 in model 117, 156, 176 Engine 270 in model 117, 156, 176, 242, 246 Engine 274.9 in model 172, 204, 205, 207, 212, 218, 253Piston ring vertical clearance *BE03.10-P-1001-05L 
30 Check end gap of piston rings (6a, 6b, 6c). Only where piston rings (6a, 6b, 6c) are reused. AR03.10-P-7311-02MR 
    IMPORTANTCommercially available devices/tools 
Feeler gauge		  
    Engine 133 in model 117, 156, 176 Engine 270 in model 117, 156, 176, 242, 246 Engine 274.9 in model 172, 204, 205, 207, 212, 218, 253Piston ring end gap *BE03.10-P-1002-05L 
31 Check connecting rod bearing shells (4) and connecting rod journals for wear and damage.    
  Notes on assessing wear on connecting rod bearings and connecting rod journals If problems occur,
↓
Replace connecting rod bearing shells (4) and or crankshaft.		 AH03.10-P-0001-03MM 
    Remove/install crankshaft
Engine 274.9 in model 205
Engine 274.9 in model 253		 AR03.20-P-4351MRA 
    Remove/install crankshaft
Engine 133 in model 117, 156, 176
Engine 270 in model 117, 156, 176, 242, 246
Engine 274 in model 172, 204, 207, 212, 218		 AR03.20-P-4351MR
32 Check cylinder barrels.
General information on inspecting cylinder walls		 Engine 270 in model 117, 156, 176, 242, 246
Engine 274.9 in model 172, 204, 205, 207, 212, 218, 253		 AH01.00-P-0300-01A
  General information on inspecting cylinder walls Engine 133 in model 117, 156, 176
If problems occur,
↓
Replace crankcase.		 AH01.00-P-0300-01AMG
33 Check remaining power unit components for wear and damage and replace if necessary. If problems occur,
↓
Replace corresponding power unit components.		  
INSTALLING Install     
34 Clamp connecting rods (2) in vise. IMPORTANT Use protective jaws.  
35 Wet piston pins (8) and connecting rod small ends with engine oil.    
REFER TO CAPACITIES & SPECIFICATIONS Specified engine oils for Cars, Vans (service) - Overview   BB00.40-P-0223-02A
36.1 Assign new pistons (5), connecting rods (2) and piston pins (8) to each other. Only where pistons (5) are replaced.  
36.2 Assign previously marked pistons (5), connecting rods (2) and piston pins (8) to each other. Only where pistons (5) are reused.
NOTES Note the applied markings during removal.
Engine damage can occur otherwise.		  
37 Manually press piston pins (8) into pistons (5). NOTES Note the applied markings during removal.
Engine damage can occur otherwise.		  
38 Install new retaining rings (7). NOTES The opening (arrow B) of the retaining rings (7) must point vertically in the direction of the piston crown (5a) after assembly.
Engine damage can occur otherwise.
IMPORTANT Replace retaining rings (7).		  
39 Remove connecting rods (2) with pistons (5) from vise.    
40 Wet cylinder bores, pistons (5), and connecting rod journals with engine oil.    
REFER TO CAPACITIES & SPECIFICATIONS Specified engine oils for Cars, Vans (service) - Overview   BB00.40-P-0223-02A
41 Tension piston rings (6a, 6b, 6c) on pistons (5) with tensioning strap. NOTES Install pistons (5) with piston ring end gaps offset by 120°.
Engine damage can occur otherwise.
SPECIAL TOOL Tensioning strap		 Fig 1
42 Install pistons (5) in the direction of travel to respective cylinder. NOTES Observe the travel direction arrows (D) on the piston crowns (5a).
Engine damage can occur otherwise.
NOTES Crank crankshaft until connecting rods (2) do not touch connecting rod journal when inserting a piston (5) in cylinder bores.
Otherwise damage will occur on the connecting rod (2) and crankshaft.		  
43 Check connecting rod bolts (3) and replace if necessary. Engine 133 in model 117, 156, 176
Engine 270 in model 117, 156, 176, 242, 246
Engine 274.9 in model 172, 204, 205, 207, 212, 218, 253
except code 494 (US version)		  
      AR03.10-P-6111-01MM 
    Connecting rod bolts *BE03.10-P-1001-03A 
44 Install connecting rod bearing shells (4).   AR03.10-P-6111-06MR 
REFER TO CAPACITIES & SPECIFICATIONS Specified engine oils for Cars, Vans (service) - Overview   BB00.40-P-0223-02A
45 Tighten connecting rod bolts (3).   AR03.10-P-6111-02MR 
Notice  Notes on threaded connections fastened using a tightening angle-based tightening process   AH00.00-P-0020-01A
    TORQUE SPECIFICATION Engine 270 in model 117, 156, 176, 242, 246
Engine 274.9 in model 172, 204, 205, 207, 212, 218, 253
Screw/bolt, connecting rod bearing cap to connecting rod		 *BA03.10-P-1001-01J 
    TORQUE SPECIFICATION Engine 133 in model 117, 156, 176
Connecting rod bolt		 *BA03.10-P-1001-01E 
46 Crank crankshaft by hand and check for unobstructed movement of crank assembly. If crankshaft only cranks sluggishly or gets stuck,
↓
check assignment and for correct seating of connecting rod bearing shells (4) and connecting rod bearing caps (1).		  
    Install and gauge connecting rod bearings AR03.10-P-6111-06MR 
47 Install balance shaft housing. Engine 270.920 in model 117, 156, 176.04, 246.24
Engine 274.920 in model 172, 204, 205, 207, 212, 218, 253		  
    Engine 270.920 in model 117, 156, 176.04, 246.24 AR03.20-P-1100MT
    Engine 274.920 in model 172, 204, 207, 212, 218 AR03.20-P-1100MR
    Engine 274.920 in model 205, 253
IMPORTANT Only install oil pan after oil pump has beer installed.		 AR03.20-P-1100MRA 
48 Install oil pump. Engine 133 in model 117, 156, 176
Engine 270 in model 117, 156, 176, 242, 246.2		 AR18.10-P-6020MT
    Engine 274.9 in model 172, 204, 207 AR18.10-P-6020MR
    Engine 274.9 in model 205, 253 AR18.10-P-6020MRA
    Engine 274.9 in model 212, 218 AR18.10-P-6020MRS
49 Install cylinder head. Engine 133 in model 117, 156, 176
Engine 270 in model 117, 156, 176, 242, 246.2		 AR01.30-P-5800MTA
AR01.30-P-5800MT
    Engine 274.9 in model 172 AR01.30-P-5800MRE
    Engine 274.9 in model 205, 253 AR01.30-P-5800MRB
    Engine 274.9 in model 204, 207 AR01.30-P-5800MRA
    Engine 274.9 in model 212, 218 AR01.30-P-5800MRS
50 Attach engine crane with load tilter to engine.    
REFER TO SPECIAL TOOLS 000 588 00 62 00 Load tilter   WS01.00-P-0102B
    IMPORTANTCommercially available devices/tools 
Engine crane		  
51 Remove engine from assembly stand.    
REFER TO SPECIAL TOOLS 000 588 00 31 00 Assembly stand for cars   WS01.00-Z-3028KOB
52 Set down engine on lifting platform, remove load tilter and engine crane. Engine 133 in model 117, 156, 176
Engine 270 in model 117, 156, 176, 242, 246		  
REFER TO SPECIAL TOOLS 000 588 03 62 00 Lifting platform   WS01.00-P-0091A
REFER TO SPECIAL TOOLS 000 588 00 62 00 Load tilter IMPORTANTCommercially available devices/tools 
Engine crane		 WS01.00-P-0102B
53 Attach transmission to engine. Transmission 724.2 in model 253 with engine 274.9 AR27.10-P-0005LVH
    Transmission 724.2 in model 205 with engine 274.9 AR27.10-P-0502LWH
    Transmission 725.0 in model 205, 253 with engine 274.9
except code M005 (Vehicles with 4MATIC/all-wheel drive)		 AR27.10-P-0500MRF
    Transmission 725.0 in model 172 with engine 274.9 AR27.10-P-0500MRE
    Transmission 722.9 in model 172 with engine 274.9 AR27.10-P-0500W
    Transmission 711.6 in model 117, 156, 176, 242, 246 with engine 270 AR26.10-P-0020NKB
    Transmission 711.6 in model 204 with engine 274.9 AR26.10-P-0020SA
    Transmission 711.6 in model 207 with engine 274.9 AR26.10-P-0020CWA
    Transmission 711.6 in model 212 with engine 274.9 AR26.10-P-0020EWG
    Transmission 716.7 in model 172 with engine 274.9 AR26.10-P-0020MRE
    Transmission 716.7 in model 205, 253 with engine 274.9 AR26.10-P-0020LWA
    Transmission 722.9 (except 722.96) in model 205 with engine 274.9 AR27.10-P-0500LWA
    Transmission 722.96 in model 205 with engine 274.9 AR27.10-P-0500LWY
    Transmission 722.9 (except 722.96) in model 207 with engine 274.9 Transmission 722.9 (except 722.96/997) in model 204 with engine 274.9 AR27.10-P-0500CV
    Transmission 722.96 in model 204 with engine 274.9 AR27.10-P-0500CWX
    Transmission 722.9 (except 722.96) in model 212 with engine 274.9
Transmission 722.9 (except 722.96) in model 218 with engine 274.9		 AR27.10-P-0500EV
    Engine 133 in model 117, 156, 176 with transmission 724.0
Engine 270 in model 117, 156, 176, 242, 246 with transmission 724.0		 AR27.10-P-0009NKB
    Transmission 725.0 in model 205, 253 with engine 274.9
with code M005 (Vehicles with 4MATIC/all-wheel drive)		 AR27.10-P-0500LWX
54.1 Install engine with transmission. Engine 133 in model 117, 156, 176
Engine 270 in model 117, 156, 176, 242, 246
Engine 274.9 in model 172, 204, 207, 212, 218
Engine 274.9 in model 205, 253
except code M005 (Vehicles with 4MATIC/all-wheel drive)		  
    Engine 274.9 in model 253
except code M005 (Vehicles with 4MATIC/all-wheel drive)		 AR01.10-P-2401MRB
    Engine 274.9 in model 212
with code 924 (Bivalent natural gas drive)		 AR01.10-P-2401MRC
    Engine 133 in model 117, 156, 176 AR01.10-P-2401MTA
    Engine 270 in model 117, 156, 176, 242, 246.2 AR01.10-P-2401MT
    Engine 274.9 in model 172 AR01.10-P-2401MRE
    Engine 274.9 in model 204 (except 204.9), 207 AR01.10-P-2401MR
    Engine 274.9 in model 204.9 AR01.10-P-2401MRG
    Engine 274.9 in model 212 except code 924 (Bivalent natural gas drive)
Engine 274.9 in model 218		 AR01.10-P-2401MRS
    Engine 274.9 in model 205
except code M005 (Vehicles with 4MATIC/all-wheel drive)		 AR01.10-P-2401MRA
54.2 Attach engine to front axle carrier. Engine 274.9 in model 205, 253
with code M005 (Vehicles with 4MATIC/all-wheel drive)		  
    Engine 274.9 in model 253
with code M005 (Vehicles with 4MATIC/all-wheel drive)		 AR01.10-P-2510MRB
    Engine 274.9 in model 205
with code M005 (Vehicles with 4MATIC/all-wheel drive)		 AR01.10-P-2510MRA
CHECK VALUES FOR CONNECTING ROD BOLT

Number Designation Engine 133, 139 Engine 137, 260, 270, 271, 274, 275, 285
BE03.10-P-1001-03A Connecting rod bolts Thread diameter   M 8X1 7X1
Shank length When new mm 42, 5 38
  max. mm 43, 3 38, 4
CHECK VALUES FOR PISTON RINGS

Number Designation Engine 133 Engine 270.910 up to 2/28/14 except code 933 (Add.parts f.telematic alarm identific.) Engine 270.920 up to 2/28/14 except code 924 (Bivalent natural gas drive)
BE03.10-P-1001-05L Piston ring vertical clearance Groove 1 mm 0, 02...0, 065 0, 04...0, 075
Groove 2 mm 0, 02...0, 06 0, 03...0, 07
Groove 3 mm - -
CHECK VALUES FOR PISTON RINGS

Number Designation Engine 270.910 up to 2/28/14 with code 933 (Add.parts f.telematic alarm identific.) Engine 270.910/920 as of 3/1/14 Engine 270.920 up to 2/28/14 with code 924 (Bivalent natural gas drive) Engine 274.910 up to 2/28/14 in model 204, 212 Engine 274.920 up to 2/28/14 in model 204, 207, 212
BE03.10-P-1001-05L Piston ring vertical clearance Groove 1 mm 0, 04...0, 075 0, 04...0, 075
Groove 2 mm 0, 03...0, 07 0, 03...0, 07
Groove 3 mm - -
CHECK VALUES FOR PISTON RINGS

Number Designation Engine 274.9 in model 167, 172, 205, 213, 218, 238, 253 Engine 274.910 as of 3/1/14 in model 204, 212 Engine 274.920 as of 3/1/14 in model 204, 207, 212
BE03.10-P-1001-05L Piston ring vertical clearance Groove 1 mm 0, 04...0, 075
Groove 2 mm 0, 03...0, 07
Groove 3 mm 0, 01...0, 18
CHECK VALUES FOR PISTON RINGS

Number Designation Engine 133 Engine 270.910 up to 2/28/14 except code 933 (Add.parts f.telematic alarm identific.) Engine 270.920 up to 2/28/14 except code 924 (Bivalent natural gas drive)
BE03.10-P-1002-05L Piston ring end gap Groove 1 mm 0, 18...0, 30 0, 2...0, 35
Groove 2 mm 0, 3...0, 5 0, 3...0, 5
Groove 3 mm 0, 2...0, 7 0, 2...0, 7
CHECK VALUES FOR PISTON RINGS

Number Designation Engine 270.910 up to 2/28/14 with code 933 (Add.parts f.telematic alarm identific.) Engine 270.910/920 as of 3/1/14 Engine 270.920 up to 2/28/14 with code 924 (Bivalent natural gas drive) Engine 274.910 up to 2/28/14 in model 204, 212 Engine 274.920 up to 2/28/14 in model 204, 207, 212
BE03.10-P-1002-05L Piston ring end gap Groove 1 mm 0, 18...0, 30 0, 2...0, 35
Groove 2 mm 0, 3...0, 5 0, 3...0, 5
Groove 3 mm 0, 2...0, 7 0, 2...0, 7
CHECK VALUES FOR PISTON RINGS

Number Designation Engine 274.9 in model 167, 172, 205, 213, 218, 238, 253 Engine 274.910 as of 3/1/14 in model 204, 212
Engine 274.920 as of 3/1/14 in model 204, 207, 212
BE03.10-P-1002-05L Piston ring end gap Groove 1 mm 0, 18...0, 30
Groove 2 mm 0, 3...0, 5
Groove 3 mm 0, 2...0, 7
CHECK VALUES FOR PISTON RINGS

Number Designation Engine 133 Engine 270.910 up to 2/28/14 except code 933 (Add.parts f.telematic alarm identific.) Engine 270.920 up to 2/28/14 except code 924 (Bivalent natural gas drive)
BE03.10-P-1003-05L Dimension Plain compression ring mm 83, 0X1, 2X2, 9 83, 0X1, 2X2, 9
Taper-faced hook scraper ring mm 83, 0X1, 0X2, 7 83, 0X1, 5X3, 5
Oil scraper ring mm 83, 0X2, 0X2, 5 83, 0X2, 0X2, 5
CHECK VALUES FOR PISTON RINGS

Number Designation Engine 270.910 up to 2/28/14 with code 933 (Add.parts f.telematic alarm identific.) Engine 270.910/920 as of 3/1/14 Engine 270.920 up to 2/28/14 with code 924 (Bivalent natural gas drive) Engine 274.910 up to 2/28/14 in model 204, 212 Engine 274.920 up to 2/28/14 in model 204, 207, 212
BE03.10-P-1003-05L Dimension Plain compression ring mm 83, 0X1, 2X2, 9 83, 0X1, 2X2, 9
Taper-faced hook scraper ring mm 83, 0X1, 0X2, 7 83, 0X1, 5X3, 5
Oil scraper ring mm 83, 0X2, 0X2, 5 83, 0X2, 0X2, 5
CHECK VALUES FOR PISTON RINGS

Number Designation Engine 274.9 in model 167, 172, 205, 213, 218, 238, 253 Engine 274.910 as of 3/1/14 in model 204, 212 Engine 274.920 as of 3/1/14 in model 204, 207, 212
BE03.10-P-1003-05L Dimension Plain compression ring mm 83, 0X1, 2X2, 9
Taper-faced hook scraper ring mm 83, 0X1, 0X2, 7
Oil scraper ring mm 83, 0X2, 0X2, 5
CONNECTING ROD

Number Designation Engine 133
BA03.10-P-1001-01E Connecting rod bolt Stage 1 Nm 5
Stage 2 Nm 30
Stage 3 ∠° 90
CONNECTING ROD

Number Designation   Engine 270 Engine 274
BA03.10-P-1001-01J Screw/bolt, connecting rod bearing cap to connecting rod For initial tightening of new bolts Stage 1 Nm 5 5
Stage 2 Nm 15 15
Stage 3 ∠° 180 180
Stage 4   Loosen bolts Loosen bolts
Stage 5 Nm 5 5
Stage 6 Nm 15 15
Stage 7 ∠° 90 90
In case of reusability Stage 1 Nm 5 5
Stage 2 Nm 15 15
Stage 3 ∠° 90 90
Fig 1: Identifying Tensioning Strap (000 589 04 14 00)
G13655408Courtesy of MERCEDES-BENZ USA
REPAIR MATERIALS

Number Designation Order number
BR00.45-Z-1028-04A Assembly cleaner A 000 986 56 01
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