Disassembly and assembly

(Table 71, contd)
A
-
Plastigauge (Green)
0.025 to 0.076 mm
(0.001 to 0.003 inch)
1
-
Plastigauge (Red)
0.051 to 0.152 mm
(0.002 to 0.006 inch)
1
-
Plastigauge (Blue)
0.102 to 0.229 mm
(0.004 to 0.009 inch)
1
-
Plastigauge (Yellow)
0.230 to 0.510 mm
(0.009 to 0.020 inch)
1
NOTICE
Keep all parts clean from contaminants.
Contaminants may cause rapid wear and shortened
component life.
Note: Perkins does not recommend the checking of
the actual clearances of the bearing shells
particularly on small engines. Checking of the actual
clearances of the bearing shells is because of the
possibility of obtaining inaccurate results and of
damaging the bearing shell or the journal surfaces.
Each Perkins bearing shell is quality checked for
specific wall thickness.
Note: The measurements should be within
specifications and the correct bearings should be
used. If the crankshaft journals and the bores for the
block and the rods were measured during
disassembly, no further checks are necessary.
However, if the technician still wants to measure the
bearing clearances, Tooling (A) is an acceptable
method. Tooling (A) is less accurate on journals with
small diameters if clearances are less than 0.10 mm
(0.004 inch).
NOTICE
Lead wire, shim stock or a dial bore gauge can dam-
age the bearing surfaces.
The technician must use Tooling (A) correctly. The
following points must be remembered:
• Ensure that the backs of the bearings and the
bores are clean and dry.
• Ensure that the bearing locking tabs are properly
seated in the tab grooves.
• The crankshaft must be free of oil at the contact
points of Tooling (A).
1. Put a piece of Tooling (A) on the crown of the
bearing that is in the cap.
Note: Do not allow Tooling (A) to extend over the
edge of the bearing.
2. Use the correct torque-turn specifications in order
to install the bearing cap. Do not use an impact
wrench. Be careful not to dislodge the bearing
when the cap is installed.
Note: Do not turn the crankshaft when Tooling (A) is
installed.
3. Carefully remove the cap, but do not remove
Tooling (A). Measure the width of Tooling (A) while
Tooling (A) is in the bearing cap or on the
crankshaft journal. Refer to Illustration 315 .
Illustration 315 g01152855
Typical Example
4. Remove all of Tooling (A) before you install the
bearing cap.
174 UENR0624-03
Disassembly and Assembly Section
This document has been printed from SPI2. NOT FOR RESALE