Page 300 - Reciprocating Compressors Operation Maintenance

Overhaul and Repair of Reciprocating Compressors 285

The following procedure has been developed for the torquing of piston
nuts when installing cast iron, aluminum, and steel pistons, either two
pieces or one piece, with straight bores. It must not be used for pistons
that use piston rods with taper fit to the piston.

I . Clamp piston rod behind the collar in a suitable fixture similar to the
one shown in Figure 4-36. Care must be taken not to clamp on any
coated surface if the rod has been coated, because cracking or
breaking the bond will result.

"V" Blocks

3*— Hex Piston
^ Nut Adapter

N / " I I Support Piston to prevent
U Use Copper sheets 11B" thick I—I bending rod when tightening nut,
in Jaws of "V" Blocks

"V" Block
Mat). Steel

I I
j L
r
Drill Size

T !

IJ \S t II f
J
H U II
II "I I j
DIMENSION TABLE
MOO SfZC A B C 0 E f 0 H J SIZE
UP TO 2 -1/4" 3-1/2 1*5/4 4 1 T I* I/* 9/8 t-l/f 9/4
•
t-i/4"«uMwe* I -1/2 « 4 1 13 2-V4 l**«4 4 l-l/t
•
FIGURE 4-36. Piston rod holding fixture.