8
Install the piston rings on the pistons, using piston
ring pliers. Letters or markings on ring surfaces
must always be turned so that the marking faces
upwards.
Install the oil scraper ring first. Put the expansion
spring (
1
) for the oil scraper ring in the lower pis-
ton ring groove, with the guide pin (
A
) inside both
ends of the spring. Check that the ends of the
expansion spring do not overlap. Install the oil
scraper ring (
2
) above the expansion spring.
Check that the ring gap is staggered 180° (356
°F) from the guide pin.
Install the ring with the tapered surface (
3
) in the
center piston ring groove so that the marking
faces the piston crown.
Install the upper ring (
4
) with the marking
upwards.
Check that the ring openings are staggered 90°
(194 °F) from each other.
Crankshaft and Bearings,
Inspection
Clean the crankshaft carefully in all channels after dis-
assembly and inspect the crankshaft thoroughly to
determine if overhaul is really necessary.
1 Check wear and ovality with a micrometer. Meas-
ure the diameters
A
-
A
and
B
-
B
at points
1
and
2
.
Max. permissible taper and ovality in the main and
big-end journals is 0.05 mm (0.002"). Change the
crankshaft if these values are exceeded.
2 Measure longitudinal crankshaft crookedness (run-
out). Lay the crankshaft on a pair of V-blocks placed
under the front and rear main bearing journals.
Alternatively, the crankshaft can be suspended
between centers. Measurements shall be done on
the center main bearing journal(s).
For max lengthwise crookedness (runout), refer to
. If these values are
exceeded, the crankshaft must be changed.
3 Check that the crankshaft seal mating surfaces on
the crankshaft are not worn or damaged.
2
3
2
4
1
A
P0008027
A
1
1
2
2
B
B
A
P0008015
21-6 Crank Mechanism
90
47701798 05-2013 © AB VOLVO PENTA
Summary of Contents for D1-13
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