Check crankshaft in removed state · ar0320p446301lfd · Mercedes-Benz WIS

AR03.20-P-4463-01LFD	Check crankshaft in removed state
Topical note	Notes on threaded connections fastened using a tightening angle-based tightening process	AH00.00-P-0020-01A
	Information on assessing wear of main bearings and main bearing journals	AH03.20-P-1000-02MM
	Notes on assessing wear on connecting rod bearings and connecting rod journals	AH03.10-P-0001-03MM

Engine

642

Test and set values for crankcase

Number	Designation				Engine 642
BE01.40-P-1001-02F	Crankshaft bearing	Basic bore-Ø		mm	80,500...80,522
		Code number 52	1st stage blue	mm	80,500...80,507
		Code number 54	2nd stage yellow	mm	80,507...80,514
		Code number 56	3rd stage red	mm	80,514...80,522
		Basic bore width at fit bearing		mm	24,979...25,000
		Permissible out-of-roundness and conicity of basic bore		mm	0,02

Check values of crankshaft

 Crankshaft bearing cap

Number	Designation				Engine 642
BA03.20-P-1001-01E	Screw/bolt, crankshaft bearing cap to crankshaft bearing body	M10	Stage 1	Nm	5
			Stage 2	Nm	35
			Stage 3	°	95
			Stage 4	°	95

 Crankshaft bearing cap

Number	Designation				Engine 642
BA03.20-P-1002-01E	Side screw/bolt, crankshaft housing to crankshaft bearing cap	M10	Stage 1	Nm	53
			Stage 2	°	95

001 589 53 21 00

Dial gage

1	Check all bearing points of the crankshaft (6) for traces of wear, cross scores, notches, blue coloration and damage.

2	Check contact surfaces of the crankshafts bearing shells (5) and thrust surfaces of the thrust plates (8) on the crankcase for traces of wear and damage.

	If damage is present,
	
	Replace crankshaft and crankcase (6).

3	Check contact surfaces of the crankshaft bearing shells (4) on the crankshaft bearing cap (1) for traces of wear and damage.

	If damage is present,
	
	Replace crankshaft and crankcase (6).

4	Check contact surfaces of the crankshaft bearing shells (4) and thrust surfaces of the thrust plates (7) on the crankshaft bearing cap (2) for traces of wear and damage.

	If damage is present,
	
	Replace crankshaft and crankcase (6).

5	Measure basic bore width on the crankshaft bearing cap (2).

	If the measured value lies outside the tolerance,
	
	Replace crankshaft and crankcase (6).

P03.20-2438-06

6	Measure the diameter on the crankshaft pins.

 Commercially available devices/tools
Outside micrometer

	If the measured value lies outside the tolerance range shown in the crankshaft check values table,
	
	Install new crankshaft (6).

P03.20-0248-01

7	Install crankshaft bearing caps (1) without crankshaft bearing shells (4, 5).  

8	Install crankshaft bearing cap (2) without crankshaft bearing shells (4, 5) and without thrust plates (7, 8).  

9	Measure basic bore diameter with a  dial indicator and a rapid measuring gauge for inner measurements in the direction A, B and C in two planes (roundness).

 Commercially available devices/tools
Quick calipers for internal measurements

	If the measured values lie outside of the tolerance,
	
	Replace crankshaft and crankcase (6).

10	Remove crankshaft bearing caps (1) and crankshaft bearing caps (2).

P03.20-2430-01

P03.20-0246-01

ah0000p002001a Notes on threaded connections fastened using a tightening angle-based tightening process
ah0310p000103mm Notes on assessing wear on connecting rod bearings and connecting rod journals
ah0320p100002mm Information on assessing wear of main bearings and main bearing journals