350SDL (126.135) L6-3.5L DSL Turbo (603.970) (1990)
Special Tools
Engines without hydraulic lifters, or engines where the camshaft must be removed to mount the tool (engines: 604-606).
The valve keepers are removed and installed with a magnetic pen (part no. 210 589 00 40 00) or a magnetic finger (part no. 116 589 06 63 00), after
pressing down on the valve spring with the spring compressor (7, Figure 2).