VOLVO MD2010, MD2020, MD2030, MD2040 Engine Renovating the Rocker Mechanism
11.2021 Volvo Impact 9227 EPC+ Service Repair Offline Download
1. MD2O10, MD2020, MD2030: Remove the screws
. at the front and rear of the rocker shaft.
MD2040: Screw in a M8 screw in the threaded hole
i n the front edge of the rocker shaft. Fix the screw
head in a vice and pull out the rocker shaft (alt. a
withdrawing tool can be used
2. Dismantle the rocker mechanism. Remove the
rockers, springs and washers.
3. Clean the parts. Observe special care with the
rocker shaft’s oil channels and oil holes in the rocker
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4. Check the wear on the rocker shaft with a micrometer (Fig. 26). Diameter min. 11.57 mm (.44555 in).
5. Check that the rocker bearing surfaces are not outof-round worn.
Calculate the clearance between the rocker and
shaft. The clearance must not exceed 0.2 mm
(.0078 in).
Check that the ball pin’s spherical part is not deformed or worn. The threads should be undamaged
on the pin and lock nut. The locknut should be in
good condition.
The mating sphere of the rockers (against the valve) must not be unevenly worn or concave. Adjustment for minor wear can be made in a grinding
machine.
Note: MD2O10-2030. A new type of rocker (includi ng valve cap) has been introduced as from engine
number:
MD2010: 5101202984
MD2020: 5101308898
M D2030: 5101465653
Only the new type of rocker is available as a spare
part. If one or several of the older type of rocker
need to be replaced, all the rockers must be replaced at once, and valve caps installed on the
valve stems.
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6. Oil in the rocker mechanism and fit the different
parts.
