BLACKMER NGH1013, Installation, Operation And Maintenance Instructions

Page: 17 / 32

COMPRESSOR DISASSEMBLY
CB6A-210 page 17/32
Failure to disconnect and lockout
electrical power or engine drive before
attempting maintenance can cause
severe personal injury or death
Hazardous
machinery can
cause serious
personal injury.
Failure to relieve system pressure prior
to performing compressor service or
maintenance can cause serious
personal injury or property damage.
Hazardous pressure
can cause serious
personal injury or
property damage
Venting pressure from the compressor
piping could release explosive gas to
the atmosphere creating an explosion
hazard, possibly causing severe
personal injury or death.
Hazardous gases
can cause property
damage, personal
injury or death
NOTICE:
Before starting work on the compressor, make sure
all pressure is bled off on both the suction and
discharge.
HEAD REMOVAL
1. Remove the head bolts from the head/cylinder.
2. There are 2 threaded jacking holes available if the
head is difficult to remove, using the head bolts.
3. Remove the head shims and keep with head for later
reassembly.
4. Remove the valves per the "Valve Replacement"
section.
PISTON REMOVAL
5. Rotate the crankshaft by hand to bring a piston to the
top dead center position.
6. Remove the piston nut with piston nut tool. Refer to
Tools List (see page 13 / Table 6).
7. Remove the piston using the two 1/4" threaded puller
holes. (If two 1/4" bolts are not readily available, the
oil pump cover bolts may be used.)
8. When removing piston make sure piston shims are
accounted for as they must be reinstalled or piston
clearance will be too low and clearance must be
reset. The clearance is a function of the tolerance
stack-up and operating temperature so failure to
properly clearance piston may result in damage.
9. Care must be taken during removal of piston so that
damage does not occur to the piston rings or rider
band. If needed remove valves per the “Valve
Replacement” section.
10. Keep the shim sets together to simplify reassembly
later, per above.
PISTON RINGS / RIDER BAND REMOVAL
11. Piston rings can be one piece or two piece. Each
can be removed by hand. If worn, they must be
replaced to maintain proper sealing.
12. Rider bands are sacrificial parts and need to be
replaced if worn. There are two designs, 1) One
piece, 2) Split. To remove Rider Band from piston
design 1, cut or spring band off. To remove Rider
Band from design 2, separate piston halves.
13. To remove the Cylinder (Figure 7)
a. Remove the Cylinder to Adaptor bolts
b. Slide Cylinder off from Adaptor carefully
using a hoist or crane.
c. Take care to not damage Adaptor O-Ring as
the fit is very snug and can be wedged if not
removed properly.
Figure 6 - Cylinder and Piston