Volvo MD2010 - Renovating the Rocker Mechanism

Engine body
Checking of valve springs
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Renovating the rocker mechanism
Check that the springs do not show any signs of
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1.
MD2O10, MD2020, MD2030: Remove the screws
damage.
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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).
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U
r(
jrq
p
4
-1
100
0
pso
Max. 2.0 mm (.0787 in)
Fig. 23. Checking of linearity
Place the valve springs on a level surface and check
the linearity with a st square (Fig. 23).
Fig. 24. Spring tester
Place the spring in a spring tester and check its length
both compressed and uncompressed.
The springs should maintain the values given in "Tech-
nical data".
3 0
Fig. 25. Dismantling of rocker mechanism (MD2040)
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 rock-
ers.
r
Fig. 26. Measuring of rocker shaft
4.
Check the wear on the rocker shaft with a microme-
ter (Fig. 26). Diameter min. 11.57 mm (.4555 in).