User Manual

54 RENR9968-02
Testing and Adjusting Section
Basic Engine
i02287898
Piston Ring Groove - Inspect
SMCS Code: 1214-040
The piston rings may have a Keystone design, which
is tapered or the piston rings may have a square cut
design. The 1U- 643 1 Piston Ring Groove Gauge
Gp is used for checking pistons with the Keystone
design. A 5P-3519 Piston Ring Groove Gauge Gp
is available for checking ring grooves with straight
sides. For instructions on the use of the gauge,
refer to Guideline For Reusable Parts and Salvage
Operations, SEBF8049, “Piston Visual Inspection”.
i01406562
Connecting Rod - Inspect
SMCS Code: 1218-040
The bores in the connecting rod must be within
specification s or the bearings will no t fit properly. If
the bores in the connecting rod have worn too much,
the bearings will fit loosely. This will cause further
wear and damage to the connecting rod, the bearing
for the piston pin, the bearing for the crankshaft, the
piston p in, and the cranks haft.
Measure the bores in the connecting rod and ensure
that the bores meet the diameters according to
the engi ne’s specifications. When you install the
connecting rod, follow the instructions of the engine’s
specifications for tightening the bolts. R efer to
Specifications, “Connecting Rod”.
i02142592
Main Bearings - Inspect
SMCS Code: 1203-040
Main bearings a re availa ble with smaller inside
diameters than the original size bearings. These
bearings are for crankshafts that have been ground.
Main bearings are available with larger outside
diameters than the original size bearings. These
bearings are used for the cylinder blocks with the
main bearing bore that is made larger than the bore’s
original size.
Refer to the Guideline For Reusable Parts,
SEBF8009, “Main a nd Connecting Rod Bearings” for
reuse inform at ion.
Refer to Special Instruction, SMHS7606, “Use of
1P-4000 Line Boring Tool Group” for the instructions
that are needed to use the tool group. This tool is
used in order to check the alignment of the main
bearing bores. The 1P-3537 Dial Bore Gauge Group
can be used to check the size of the bore.
i02487145
Cylinder Block - Inspect
SMCS Code: 1201-040
Ta b l e 1 6
Required Tools
Part
Number
Part N ame
Quantity
1P-3537
Dial Bore Gauge Group
1
g00285686
Illustration 45
1P-3537 Dial Bore Gauge G roup
Ifthemainb
earing caps are installed without
bearings, the bore in the block for the main bearings
can be c hecked. Tighten the nuts on the bearing caps
to the torqu
e that is given in Specifications, “Cylinder
Block”. Alignment error in the bores must not be more
than 0.08 mm (0.003 inch).
The 1P-3537 Dial Bore Ga ug e Gro up can be used
to check the size of the bore.
i02779075
Cylinder Liner Projection -
Inspect
SMCS Code: 1216-040
Note: The following procedure does not require the
use of an “H” bar to hold the liners while th e liner
projecti
on measurements are taken.