Setting play between thrust element and steering rack - AR46.20-P-0601TX

MODEL 164, 171, 219, 251 

Fig 1: Checking Thrust Element And Steering Rack Play

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Adjustment Screw

Courtesy of MERCEDES-BENZ USA

Fig 3: Checking Stop Ring

Courtesy of MERCEDES-BENZ USA

MODIFICATION NOTES

25.2.09

SWZ for model 164, 251 added

Step 9

	Removing
	Only one adjustment procedure for the rack-and-pinion steering is permissible. Should several caulkings (center punch marks) be visible on the adjustment screw (2), it is assumed that an adjustment procedure has already been performed, in this case the rack-and-pinion steering should be replaced
1	Remove rack-and-pinion steering	Model 164	AR46.20-P-0600GZ
		Model 171	AR46.20-P-0600V
		Model 219	AR46.20-P-0600TX
		Model 251	AR46.20-P-0600RT
2	Mount the rack-and-pinion steering on the steering gear housing support	Ensure that the workplace is scrupulously clean when carrying out the work described below and while performing repairs! Only the specified tool may be used! Before the start of repair remove loose contamination without using cleaning agent on the steering gear housing (14)!
			Fig 7
3	Detach both inner tie rods with axial joints	Model 164	AR46.40-P-0201GZ
		Model 171	AR46.40-P-0201V
		Model 219	AR46.40-P-0201TX
		Model 251	AR46.40-P-0201RT
4	Screw the stop plates (1) on the left and right into the gear rack (4)
5	Grease steering rack (4)	Renolit JP1619 special grease	*BR00.45-Z-1067-06A
6	Crank gear rack (4) several times using socket wrench		Fig 6
7	Move steering rack (4) to center position	The gear rack must be exactly in the center position, to avoid falsifying the test result. Detach the stop plates (1) on both sides of the gear rack. Find the middle position using a depth gauge. Balance out the gaps from the end of the steering rack to the stop ring (16) in the steer jacket (14) on both sides of the steering rack.
8	Pull rubber plug carefully out of the adjusting screw (2)	Do not damage rubber plug when pulling out.
	Checking
9	Mount bracket and dial indicator on the steering gear housing (14) over the adjustment screw (2)	Model 164, 251	Fig 8
		Model 171, 219	Fig 4
			Fig 5
10	Using the dial indicator, check the play between the gear rack (4) and thrust piece (3)	To do this, crank the gear rack in the direction of the arrow. In the process the specified test torque of the toothed rack must not be exceeded, otherwise the inner compression spring will be damaged.	*BE46.20-P-1001-01C
		Test torque Further procedure after determining an unacceptable play between the toothed rack and thrust piece: Play less than 0.04 mm: Adjust play. Play 0.09 to 0.6 mm: Adjust Play. Play greater than 0.6 mm: Replace rack-and-pinion steering.	*BA46.20-P-1004-01J
11	Detach bracket and dial indicator from steering gear housing (14)
	Adjust play between rack-and-pinion steering and thrust piece (3)	Perform work steps 12 to 18 only if necessary.
12	Tighten adjusting screw (2) on block
13	Slacken adjusting screw (2) approx. 1/8 turn
14	Mount bracket and dial indicator on the steering gear housing (14) over the adjustment screw (2)
15	Using the dial indicator, check the play between the gear rack (4) and thrust piece (3)	To do this, crank the gear rack in the direction of the arrow. In the process the specified test torque of the toothed rack must not be exceeded, otherwise the inner compression spring will be damaged. Test torque:	*BE46.20-P-1001-01C
		Model 164	*BA46.20-P-1005-01K
		Model 171	*BA46.20-P-1006-01F
		Model 219	*BA46.20-P-1004-01J
		Model 251 If the play is smaller  than the specified tolerance, loosen the adjustment screw (2) again slightly (in order to prevent the thrust piece digging into the toothed rack) and check play again. If the play is within the  tolerance, then the play is OK. If the play is outside  the permissible tolerance, the adjustment must be repeated. Should the play still be outside the permissible tolerance after being adjusted again, the rack-and-pinion steering must be replaced.	*BA46.20-P-1005-01L
16	Detach bracket and dial indicator from steering gear housing (14)
17	Secure the adjusting screw (2) with three center punch marks	Center punch marks see items, second picture.
18	Press rubber plug carefully into the adjusting screw (2)	Check rubber plug for damage and replace if necessary.
	Install
19	Mount both inner tie rods with axial joints on gear rack (4)	Model 164	AR46.40-P-0201GZ
		Model 171	AR46.40-P-0201V
		Model 219	AR46.40-P-0201TX
		Model 251	AR46.40-P-0201RT
20	Detach rack-and-pinion steering from steering gear housing support
21	Install rack-and-pinion steering	Model 164	AR46.20-P-0600GZ
		Model 171	AR46.20-P-0600V
		Model 219	AR46.20-P-0600TX
		Model 251	AR46.20-P-0600RT

TEST VALUES FOR STEERING GEAR

Number	Designation		Model 164	Model 171	Model 219	Model 251
BE46.20-P-1001-01C	Play between thrust piece and steering rack	mm	0.02 to 0.06	0.04 to 0.08	0.04 to 0.08	0.02 to 0.06

STEERING GEAR

Number	Designation			Model 219
BA46.20-P-1004-01J	Rack	Test torque	Nm	12 (±2)

STEERING GEAR

Number	Designation			Model 171
BA46.20-P-1006-01F	Rack	Test torque	Nm	12 (±2)

STEERING GEAR

Number	Designation			Model 164.1/8
BA46.20-P-1005-01K	Rack	Test torque	Nm	12 (±2)

STEERING GEAR

Number	Designation			Model 251
BA46.20-P-1005-01L	Rack	Test torque	Nm	12 (±2)

Fig 4: Identifying Bracket (203 589 03 31 00)

Courtesy of MERCEDES-BENZ USA

Fig 5: Identifying Dial Indicator (001 589 53 21 00)

Courtesy of MERCEDES-BENZ USA

Fig 6: Identifying Socket Wrench (203 589 04 31 03)

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Fig 7: Identifying Steering Gear Housing Support (203 589 04 31 00)

Courtesy of MERCEDES-BENZ USA

Fig 8: Identifying Bracket (164 589 00 31 00)

Courtesy of MERCEDES-BENZ USA

REPAIR MATERIALS

Number	Designation	Order number
BR00.45-Z-1067-06A	Renolit JP1619 special grease	A 001 989 38 51 10