F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ
S
ECTION
5 - M
AINTENANCE
PAGE 5-9
lutely clean. Snap new dry half bearing shells into the rod and bearing cap with
the bearing tabs properly located in the notches. With the crankcase top cover
and crosshead guide covers off, turn the throw to near the inner dead center
position. Apply new clean lubricating oil, same type as is used in the frame, lib-
erally to rod bearing shell face. Slide the properly numbered rod matching the
throw number, with bearing shell installed, into the crosshead guide space
toward the crankshaft while supporting the rod.
NOTE: THE CAPS AND RODS ARE NUMBERED BY THROW BEGINNING WITH NUM-
BER ONE AT THE DRIVE END. SEE FIGURE 1-1, FIGURE 1-2 AND FIGURE 1-3
FOR THROW NUMBERING SEQUENCE. ALWAYS INSTALL RODS AND CAPS
WITH THE NUMBERS UP (OR TOWARD ACCESS OPENING IN THE JGI). BE
SURE TO PROTECT CRANK PIN AT ALL TIMES.
F
IGURE
5-7 C
ONNECTING
R
OD
A
SSEMBLY
I
NSTALLATION
Adjacent Crankshaft
Web
Stamped Throw
Numbers Up
Conn
ectin
g
Rod
Connecting
Rod Cap
Rod-Cap
Cap-Screws (4)
Bushing
Connecting
Rod
Dowels
Bearing Shell
Connecting
Rod Cap
Bearing Shell
Oil Passage
Tab Notch
Tab
Tab Notch
Dowel
Hole
Tab
Dowel
Hole
4.
Fit the rod to the crank pin and turn the crankshaft to position the crank pin up,
near to the highest position, while supporting the rod. Oil the crankshaft crank
pin bearing surfaces with new clean lubricating oil, same type as is used in the
frame, before installing the connecting rod cap. Lubricate cap bolting threads
and seating surfaces with a thin coating of oil. Insert cap-screws into the cap.
Slide bolting out of the cap until ends of all bolts are even with the cap parting
face. Use the top bolts as handles to move the cap into place. Place the properly
numbered cap matching the throw number on to the top of the crank pin with the
parting face parallel to the rod face, and with numbered matching number up
(the tab side of the bearing toward the throw). Align the rod cap dowels with the
rod dowel holes and push into the rod. Screw all cap bolting into the connecting
rod and snug up. Do not tighten the bolting at this point.
5.
Install the crosshead and attach to the connecting rod. See “Crosshead - Instal-
lation” on Page 5-13.
6.
Tighten the connecting rod bolting an alternating (criss-cross) pattern in 25%
increments for each cap to full torque, to the values listed in Table 1-12 on page
1-16.
7.
Measure each crankshaft to connecting rod bearing jack clearance and connect-
ing rod thrust (side) clearance. See “Connecting Rod (Crank Pin) Bearing” on
Page 5-4. Record readings on the form on Page 5-48. Also check crosshead pin
bushing clearance to Table 1-3 on page 1-10. If readings are not within tolerance