Wisconsin VH4D Dokumentacja Pobierz pdf (Strona 25)

LOCATING LUGS

STAMPED

NUMBERS

SHELL

BEARING

Fig. 26

Fig. 28

MARK ON CAP

OIL SPRAY NOZZLES

Fig, 27

crankshaft untilpiston is at top, then push connecting

rod and piston assembly upward and out thru top of

cylinder. Be careful not to mar the crank pin by allow-

ing the rod bolts to strike or scrape across it. Place

caps on rods immediately so that they willnot be mis-

matched in reassembly. Be sure that shims (used in

babbitt bearing rods), are in place before cap is put on.

NOTE: These models of engines were originally fur-

nished with babbitt cast connecting rod bearings.

Shell bearing rods are now being used for current pro-

duction engines, and are interchangeable with babbitt

bearing rods for service replacement. Care should be

taken in reassembly to mount bearings properly. The

cap should be assembled to the rod so that the local.

ing lug of both bearing halves are on the same side

as illustrated in Fig. 28. Refer to chart, Fig. 32, for

clearance between bearing and crank pin.

The piston skirt is cam-ground to an elliptical con-

tour. Clearance between the piston and cylinder must

be measured at the center of the thrust face at the

bottom of the piston skirt. Refer to Chart, Fig. 32, for

proper clearance. The thrust faces on the piston skirt

Fig. 29

are 90° from the axis of the piston pin hole, with the

wide section of the piston skirt toward the maximum

thrust side, or opposite the crankshaft rotation, See

Engine Sectional, Fig. 2.

In reossembly; be sure piston and connecting rod as-

semblies are put back into the same bore from which

they were removed. Use a suitable ring compressor

and stagger the piston ring gaps 90

apart around the

piston. Oil the pistons, rings, wrist pins, rod bearings

and cylinder walls before assembly.

CAUTION: Identical numbers are stamped on the side

of the rod with its corresponding cap. These numbers

must be on the same side of the connecting rod when

mounted in engine. Be sure that oil hole in connect-

iag rod cap is facing toward the oii spray nozzle, as

illustrated in Fig. 29. Install new nuts on connecting

rod bolts and torque 22 to 28 foot pounds.

PISTON RINGS (Fig’s. 30, 31, 32)

If a ring expander tool is not available, install rings

by placing the open end of ring on piston first, as

shown in Fig. 30. Spread ring only far enough to slip

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 47 48

Komentarze do niniejszej Instrukcji

Brak uwag

Wisconsin VH4D Dokumentacja Strona 25

Komentarze do niniejszej Instrukcji