Remove/Install Crankshaft - AR03.20-P-4351MRA

WARNING: This page is about a different car, the 2023 Mercedes-Benz GLC300, 2022 Mercedes-Benz GLC300, 2021 Mercedes-Benz GLC300, 2020 Mercedes-Benz GLC350e, and 2020 Mercedes-Benz GLC300. However, it is still accessible from the selected car via links, so may be relevant.

Engine 274.9 in model 205

Engine 274.9 in model 253

MODIFICATION NOTES

25.04.2018	Document completely revised.
13.04.2018	Check the lower crankshaft bearing shells (4), upper crankshaft bearing shells (5), lower thrust plates (A), upper thrust plates (B) and the crankshaft bearing journal for wear and damage, added.	Operation step 31
13.04.2018	Check the connecting rod bearing shells and the connecting rod journals for wear and damage, added.	Operation step 32
13.04.2018	Screw, connecting rod bearing cap to connecting rod.	Operation step 48	AR03.10-P-6111-02MR
09.05.2018	Factual information for vehicles with code 494 (USA version) added.	Operation step 48	AR03.10-P-6111-02MR
19.09.2018	Basic date, added.	Operation step 48	AR03.10-P-6111-02MR
19.09.2018	New operation step added.	Operation step 48	AR03.10-P-6111-02MR

Fig 1: Crankshaft Components Location - Engine 274.9 In Model 253

Courtesy of MERCEDES-BENZ USA

	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
	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
	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 threaded connections fastened using a tightening angle-based tightening process		AH00.00-P-0020-01A
Notice	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
	Remove
1.1	Remove engine with transmission.	Engine 274.9 in model 205 except code M005 (Vehicles with 4MATIC/all-wheel drive) Engine 274.9 in model 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 205 except code M005 (Vehicles with 4MATIC/all-wheel drive)	AR01.10-P-2401MRA
1.2	Remove engine from front axle carrier.	Engine 274.9 in model 205 with code M005 (Vehicles with 4MATIC/all-wheel drive) Engine 274.9 in model 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 the rear radial shaft sealing ring.		AR03.20-P-3063MRA
3	Attach engine to assembly stand.
	000 588 00 31 00 Assembly stand for cars		WS01.00-Z-3028KOB
4	Remove engine crane with load tilter from engine.
	000 588 00 62 00 Load tilter		WS01.00-P-0102B
		Commercially available devices/tools Engine crane
5	Remove camshafts.		AR05.20-P-6992MRA
6	Remove the timing case cover.		AR01.40-P-8000MRA
7	Remove timing chain from timing chain drive gear (3).
8	Remove oil pump.		AR18.10-P-6020MRA
9	Remove oil pump chain from timing chain drive gear (3).
10	Remove balance shaft housing.	Engine 274.920 in model 205, 253	AR03.20-P-1100MRA
11	Remove timing chain drive gear (3) from crankshaft (6).
12	Screw center bolt of the belt pulley into the crankshaft (6).	Socket wrench bit	Fig 5
13	Mark the installation position on the connecting rod bearing caps and connecting rods.	Do not mix up the connecting rod bearing caps. Engine damage can occur otherwise.
14	Remove the connecting rod bolts and connecting rod bearing cap.	The connecting rods and the connecting rod bearing caps are cracked (broken). Do not mix up the connecting rods. Engine damage can occur otherwise. While turning the crankshaft (6) ensure that connecting rods do not get tilted.
15	Mark the connecting rod bearing shells relative to the associated connecting rod and connecting rod bearing cap.	Only where connecting rod bearing shells are reused.
		Do not mix up the connecting rod bearing shells. Engine damage can occur otherwise.
16	Remove the connecting rod bearing shells.
17	Determine end play of crankshaft main bearing.
	000 588 00 31 00 Assembly stand for cars		WS01.00-Z-3028KOB
			AR03.20-P-4291-03MR
		Crankshaft bearing clearance	*BE03.20-P-1001-04H
		Dial Gauge	Fig 3
		Dial indicator holder If the maximum value of the crankshaft main bearing end play is exceeded: ↓ replace lower thrust plates (A) and upper thrust plates (B) and carry out a new inspection. If the maximum value of the crankshaft main bearing end play is exceeded again: ↓	Fig 4
		replace crankshaft (6), lower crankshaft bearing shells (4), upper crankshaft bearing shells (5), connecting rod bearing shells and the crankcase.
18	Mark crankshaft bearing caps (1) and crankshaft main bearing cap (2) relative to crankcase.	The crankshaft bearing caps (1), crankshaft main bearing cap (2) and crankcase are produced together. Do not interchange. Engine damage can occur otherwise.
19	Remove screws of crankshaft bearing caps (1) and crankshaft main bearing cap (2) in reverse order of tightening procedure.	Tightening procedure for crankshaft bearing caps	AR03.20-P-4351-02MR
20	Remove crankshaft bearing caps (1) and crankshaft main bearing cap (2).
21	Mark lower crankshaft bearing shells (4) relative to the respective crankshaft bearing caps (1) and the crankshaft main bearing cap (2).	Only when reusing the lower crankshaft bearing shells (4).
22	Mark lower thrust plates (A) relative to crankshaft main bearing cap (2).	Only when reusing lower thrust plates (A).
23	Remove the lower crankshaft bearing shells (4) from crankshaft bearing caps (1) and crankshaft main bearing cap (2).
24	Remove lower thrust plates (A) from crankshaft main bearing cap (2).
25	Remove the crankshaft (6) from the crankcase.
26	Mark the upper crankshaft bearing shells (5) relative to the crankcase.	Only when reusing the upper crankshaft bearing shells (5).
27	Mark the upper thrust plates (B) relative to the crankcase.	Only when reusing the upper thrust plates (B).
28	Remove upper crankshaft bearing shells (5) and upper thrust plates (B) from crankcase.
29	Clean all parts of the crank assembly.	The parts of the crank assembly must be absolutely free of soiling. Engine damage can occur otherwise. Assembly cleaner	*BR00.45-Z-1028-04A
	Check
30	Check crankshaft (6) in the removed state.	Only if the crankshaft is reused (6).
			AR03.20-P-4463-01MR
		Sliding bearing pins (GZ) diameter	*BE03.20-P-1001-02K
		Crankshaft bearing	*BE01.40-P-1001-04A
		Bolt for crankshaft bearing cap	*BA03.20-P-1001-01B
		Dial Gauge	Fig 2
31	Check the lower crankshaft bearing shells (4), upper crankshaft bearing shells (5), lower thrust plates (A), upper thrust plates (B) and the crankshaft bearing journal for wear and damage. Information on assessing wear of main bearings and main bearing journals		AH03.20-P-1000-02MM
		If problems occur, ↓ replace lower crankshaft bearing shells (4), upper crankshaft bearing shells (5), lower thrust plates (A), upper thrust plates (B) and the crankshaft (6).
32	Check connecting rod bearing shells and connecting rod journals for wear and damage. Notes on assessing wear on connecting rod bearings and connecting rod journals		AH03.10-P-0001-03MM
		If problems occur, ↓ replace the connecting rod bearing shells and crankshaft (6).
	Install
33	Assign new upper crankshaft bearing shells (5) and new lower crankshaft bearing shells (4).	Only when replacing upper crankshaft bearing shells (5) and lower crankshaft bearing shells (4).	AR03.20-P-4360-01MR
34	Wet upper crankshaft bearing shells (5) and upper thrust plates (B) with engine oil.
	Specified engine oils for Cars, Vans (service) - Overview		BB00.40-P-0223-02A
35.1	Insert new upper crankshaft bearing shells (5) and new upper thrust plates (B) into the cylinder crankcase.	Only when replacing upper crankshaft bearing shells (5) and upper thrust plates (B).
35.2	Insert previously marked upper crankshaft bearing shells (5) and previously marked upper thrust plates (B) at the respectively marked location in the crankcase.	Only when reusing upper crankshaft bearing shells (5) and upper thrust plates (B).
36	Wet crankshaft journals with engine oil.
	Specified engine oils for Cars, Vans (service) - Overview		BB00.40-P-0223-02A
37	Position crankshaft (6) in the crankcase.
38	Wet lower crankshaft bearing shells (4) with engine oil.
	Specified engine oils for Cars, Vans (service) - Overview		BB00.40-P-0223-02A
39.1	Insert new lower crankshaft bearing shells (4) into the crankshaft bearing caps (1) and the crankshaft main bearing cap (2).	Only when replacing the lower crankshaft bearing shells (4).
39.2	Insert previously marked lower crankshaft bearing shells (4) into the respectively marked crankshaft bearing cap (1) and the marked crankshaft main bearing cap (2).	Only when reusing the lower crankshaft bearing shells (4).
40	Wet lower thrust plates (A) with engine oil.
	Specified engine oils for Cars, Vans (service) - Overview		BB00.40-P-0223-02A
41.1	Insert new lower thrust plates (A) into the crankshaft main bearing cap (2).	Only when replacing the lower thrust plates (A).
41.2	Insert the previously marked lower thrust plates (A) for the respectively marked location into the crankshaft main bearing cap (2).	Only when reusing lower thrust plates (A).
42	Install the crankshaft bearing caps (1) and the crankshaft main bearing cap (2) at the respectively marked location in the crankcase. Interference fit of crankshaft bearing cap	Install crankshaft bearing caps (1) and crankshaft main bearing cap (2) at same location and in same direction. Engine damage can occur otherwise.	AH03.20-P-4351-02MM
43	Wet heads of new screws for crankshaft bearing caps (1) and crankshaft main bearing cap (2) with engine oil.
	Specified engine oils for Cars, Vans (service) - Overview	Replace screw/bolts.	BB00.40-P-0223-02A
44	Screw in new screws for crankshaft bearing caps (1) and crankshaft main bearing cap (2) and tighten them.	Tightening procedure for crankshaft bearing caps	AR03.20-P-4351-02MR
		Bolt for crankshaft bearing cap	*BA03.20-P-1001-01B
45	Turn crankshaft (6) at center bolt of the belt pulley check for and unobstructed movement.	Socket wrench bit If the crankshaft (6) is sluggish or sticking, i check for correct use and seating of upper crankshaft bearing shells (5) and lower crankshaft bearing shells (4).	Fig 5 AR03.20-P-4360-01MR
46.1	Check the connecting rod bolts and replace if necessary.	Engine 274.9 in model 205 except code 494 (US version) Engine 274.9 in model 253 except code 494 (US version)
			AR03.10-P-6111-01MM
		Connecting rod bolts	*BE03.10-P-1001-03A
46.2	Replace connecting rod bolts.	Engine 274.9 in model 205 with code 494 (US version) Engine 274.9 in model 253 with code 494 (US version) Replace connecting rod bolts after every use. Otherwise, there is a danger of engine damage.
47	Install connecting rod bearing shells.		AR03.10-P-6111-06MR
	Specified engine oils for Cars, Vans (service) - Overview		BB00.40-P-0223-02A
48	Tighten the connecting rod bolts.		AR03.10-P-6111-02MR
		Screw/bolt, connecting rod bearing cap to connecting rod	*BA03.10-P-1001-01J
49	Turn crankshaft (6) at center bolt of the belt pulley check for and unobstructed movement.	Socket wrench bit If the crankshaft (6) is sluggish or sticking, ↓ Check for correct use and seating of the connecting rod bearing shells.	Fig 5
			AR03.10-P-6111-06MR
50	Remove center bolt of the belt pulley from the crankshaft (6).	Socket wrench bit	Fig 5
51	Slide timing chain drive gear (3) onto crankshaft (6).	Ensure correct seating of the fitted spring. Engine damage can occur otherwise.
52	Install balance shaft housing.	Engine 274.920 in model 205, 253 Only install oil pan after oil pump has beer installed.	AR03.20-P-1100MRA
53	Lay oil pump chain on timing chain drive gear (3).
54	Install oil pump.		AR18.10-P-6020MRA
55	Lay timing chain on timing chain drive gear (3)
56	Install the timing case cover.		AR01.40-P-8000MRA
57	Install camshafts.		AR05.20-P-6992MRA
58	Mount engine crane with load tilter on engine.
	000 588 00 62 00 Load tilter	Commercially available devices/tools Engine crane	WS01.00-P-0102B
59	Remove engine from assembly stand.
	000 588 00 31 00 Assembly stand for cars		WS01.00-Z-3028KOB
60	Install new rear radial shaft sealing ring.		AR03.20-P-3063MRA
61.1	Install engine with transmission.	Engine 274.9 in model 205 except code M005 (Vehicles with 4MATIC/all-wheel drive) Engine 274.9 in model 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 205 except code M005 (Vehicles with 4MATIC/all-wheel drive)	AR01.10-P-2401MRA
61.2	Attach engine to front axle carrier and install engine.	Engine 274.9 in model 205 with code M005 (Vehicles with 4MATIC/all-wheel drive) Engine 274.9 in model 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 CRANKCASE

Number	Designation			Engine 274
BE01.40-P-1001-04A	Crankshaft bearing	Basic bore diameter	mm	59, 000...59, 019
		Basic bore width at fit bearing	mm	19, 967...20, 00
		Permissible out-of-roundness and taper of basic bore	mm	0, 03

CHECK VALUES FOR CONNECTING ROD BOLT

Number	Designation				Engine 137, 260, 270, 271, 274, 275, 285
BE03.10-P-1001-03A	Connecting rod bolts	Thread diameter		M	7X1
		Shank length	When new	mm	38
			max.	mm	38, 4

CHECK VALUES FOR CRANKSHAFT

Number	Designation			Engine 274
BE03.20-P-1001-02K	Sliding bearing pins (GZ) diameter	Nominal 0	mm	54, 940...54, 965
		Repair stage 1 blue GZ1 - GZ5 (BU)	mm	54, 960...54, 965
		Repair stage 2 yellow GZ1 - GZ5 (YE)	mm	54, 955...54, 960
		Repair stage 3 red GZ1 - GZ5 (RD)	mm	54, 950...54, 955
		Repair stage 4 white GZ1 - GZ5 (WH)	mm	54, 945...54, 950
		Repair stage 5 violet GZ1 - GZ5 (VT)	mm	54, 940...54, 945

TEST SPECIFICATIONS FOR CRANKSHAFT BEARING CLEARANCE

Number	Designation			Engine 274
BE03.20-P-1001-04H	Crankshaft bearing clearance	Radial measurement when new	mm	0, 019...0, 043
BE03.20-P-1001-04H	Crankshaft bearing clearance	Axial measurement when new	mm	0, 120...0, 300

CONNECTING ROD

Number	Designation				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
			Stage 2	Nm	15
			Stage 3	∠°	180
			Stage 4		Loosen bolts
			Stage 5	Nm	5
			Stage 6	Nm	15
			Stage 7	∠°	90
		In case of reusability	Stage 1	Nm	5
			Stage 2	Nm	15
			Stage 3	∠°	90

CRANKSHAFT BEARING CAP

Number	Designation			Engine 274
BA03.20-P-1001-01B	Bolt for crankshaft bearing cap	Stage 1	Nm	36
BA03.20-P-1001-01B	Bolt for crankshaft bearing cap	Stage 2	∠°	120

Fig 2: Identifying Dial Gauge (001 589 53 21 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Dial Gauge (001 589 32 21 00)

Courtesy of MERCEDES-BENZ USA

Fig 4: Identifying Dial Indicator Holder (363 589 02 21 00)

Courtesy of MERCEDES-BENZ USA

Fig 5: Identifying Socket Wrench Bit (001 589 65 09 00)

Courtesy of MERCEDES-BENZ USA

REPAIR MATERIALS

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