4.2.6 Valve gear
1 Camshaft drive gear
2 Swing follower shaft
3 Swing follower (intake)
4 Swing follower (exhaust)
5 Camshaft
6 Pushrod
7 Rocker shaft
8 Rocker arm (intake)
9 Locknut
10 Adjusting screw
11 Rocker arm (exhaust)
12 Rocker arm bearing block
13 Valve bridge
Valve gear
The camshaft with drive gear and the swing followers are installed in the crankcase. The swing followers and
rocker arms are connected via pushrods. The rocker shaft supports with the rocker arms are mounted on the
cylinder heads.
Technical data
• Centrally arranged camshaft, lubrication of sleeve bearings from the crankcase
• The drive gear of the camshaft is directly driven by the crankshaft gear
• Valves are controlled by swing followers, pushrods, rocker arms, and valve bridges
• Rocker shaft support and rocker arms are supplied with engine oil by the lube-oil system
• Floating valve bridges for intake and exhaust valves
• Valve clearance adjustment on adjusting screws of rocker arms
Benefits
• Low-weight design
• Low rotating masses
MS15065/01E 2019-01
| Series 4000 Engines | 51
TIM-ID: 0000012113 - 006
