Camshaft, Lifters and Push Rods: Service and Repair
Valvetrain Assembly Overview
1 Intake camshaft
• Checking radial clearance with Plastigage, Wear limit: 0.1 mm.
• Run out: max. 0.01 mm.
• Checking axial play, refer to --> [ Camshafts, Checking Axial Play ] Testing and Inspection.
• Identification, refer to --> [ Camshaft Identification ] Application and ID.
• Removing and installing, refer to --> [ Camshafts ] Camshafts.
2 Camshaft bearing cap
• Installation position, refer to --> [ Installed Position of Camshaft Bearing Caps ] Camshafts
• Installation sequence, refer to --> [ Camshafts ] Camshafts.
3 Exhaust camshaft
• Checking radial clearance with Plastigage, Wear limit: 0.1 mm.
• Run out: max. 0.01 mm.
• Checking axial play, refer to --> [ Camshafts, Checking Axial Play ] Testing and Inspection.
• Identification, refer to --> [ Camshaft Identification ] Application and ID.
• Removing and installing, refer to --> [ Camshafts ] Camshafts.
4 5 Nm + 1/8 turn (45°)
5 Seal
• If seal is leaking, replace completely.
• Coat contact surfaces of seal when installing control housing.
• Do not spread seals excessively when inserting.
6 Control housing
• Oil contact surface of sealing rings before installing.
• Camshaft adjustment valves, removing and installing. Refer to --> [ Camshaft Adjuster Valves ] Camshaft Adjuster Valves.
• Markings for valve timing, refer to --> [ Markings on Control Housing ] Testing and Inspection
• Control housing assembly overview, refer to --> [ Control Housing Assembly Overview ] Service and Repair.
• Check control housing strainer for contamination before installation, refer to --> [ Checking Strainer of Control Housing for Contamination ] Service and Repair
• Removing and installing, refer to --> [ Camshafts ] Camshafts.
7 8 Nm
• Insert using locking fluid (D 000 600 A2).
8 Exhaust camshaft adjuster
• Identification: 32A.
• Rotate engine only with camshaft adjuster installed and chain installed.
• Camshaft adjustor with timing chain for camshaft drive, installing. Refer to --> [ Camshaft Adjuster with Camshaft Drive Timing Chain, Installing ] Camshaft Adjuster with Camshaft Drive Timing Chain, Installing.
9 Intake camshaft adjuster
• Identification: 24E.
• Rotate engine only with camshaft adjuster installed and chain installed.
• Camshaft adjustor with timing chain for camshaft drive, installing. Refer to --> [ Camshaft Adjuster with Camshaft Drive Timing Chain, Installing ] Camshaft Adjuster with Camshaft Drive Timing Chain, Installing.
10 60 Nm + 1/4 turn (90°)
• Replace.
• Contact surface of sensor wheel at bolt head must be dry when installing.
• To remove and install, counter hold at crankshaft using an open end wrench (27 mm), refer to --> [ Camshafts ] Camshafts.
11 Cylinder head height
• Minimum height: a = 139.9 mm.
12 Drive pinion for high pressure pump
• Vehicles without a vacuum pump.
With needle bearing lying inside.
Oil needle bearing before installing.
13 Bearing shell without input shaft
• Vehicles without a vacuum pump.
Ring groove in the bearing shell faces forward.
• Vehicles with a vacuum pump.
The input shaft only fits into the drive pinion in one position.
14 Valves
• Do not rework, only grinding is permitted.
• Valve dimensions, refer to --> [ Valve Dimensions ] [1][2]Specifications.
15 Alignment bushing
16 Cylinder head
• Check for distortion, refer to --> [ Checking Cylinder Head for Distortion ] Cylinder Head Assembly Overview
• Removing and installing, refer to --> [ Cylinder Head ] Cylinder Head.
• Rework valve seats, refer to --> [ Valve Seat, Rework Dimensions ] [1][2]Specifications.
• After replacing replace entire amount of coolant.
17 Pump plunger
• Note installation position.
18 Support element
• Before installing, check axial play in camshafts, refer to --> [ Camshafts, Checking Axial Play ] Testing and Inspection.
• Do not interchange.
• With hydraulic valve clearance compensation.
19 Valve stem seal
• Replacing, refer to --> [ Valve Stem Seals ] Service and Repair.
20 Camshaft timing chain
• Mark direction of rotation before removing (installation position), refer to --> [ Identifying the Timing Chain ] Timing Chains and Adjusters Assembly Overview
• Camshaft adjustor with timing chain for camshaft drive, installing. Refer to --> [ Camshaft Adjuster with Camshaft Drive Timing Chain, Installing ] Camshaft Adjuster with Camshaft Drive Timing Chain, Installing.
21 Securing clip
• Check for secure seat.
22 Roller rocker lever
• Before installing, check axial play in camshafts, refer to --> [ Camshafts, Checking Axial Play ] Testing and Inspection.
• Do not interchange.
• Check roller for easy movement.
• Lubricate contact surface.
• Use securing clip to clip onto support element when installing.
23 Valve spring
• Note installation position.
• Removing and installing, refer to --> [ Valve Stem Seals ] Service and Repair.
24 Valve spring plate
25 Valve keepers