MAN-2V3B-4.1V REV (B)
19
7.5 CYLINDERS:
The compression cylinders must be removed to service the rings and pistons.
Each cylinder should be marked prior to removal to enable proper orientation upon reinstallation.
REMOVE AND INSTALL COMPRESSION CYLINDER
.
a.
Remove the cylinder head per Section 7.3.
b.
The 3rd stage floating piston may be pulled out top of cylinder with the piston at TDC.
Otherwise the piston may fall out bottom when 3rd stage cylinder is removed from 2nd
stage head. For the 1st and 2nd stage pistons, turning the flywheel by hand to position
the piston at bottom dead center may ease removal of the cylinder.
c.
Being careful to prevent side stress on the piston and rod assembly, lift the cylinder off
the piston. Remove and discard the used o-rings. See chapter 5 for wear information and
end of this chapter for tolerances.
d.
See instructions in piston ring replacement section(s) for reinstallation procedure.
7.6
PISTON RINGS:
The rings should be replaced as necessary. The 3rd stage has a floating
piston and there is a rider ring on the piston rod that must be replaced. Drawing A3534 provides
instructions for installing the spiral rings.
7.6.1
REPLACE PISTON RING - FIXED PISTON
- 1ST STAGE
a.
Remove the cylinder head per Section 7.3.
b.
Using care to prevent side stress on the piston rod, lift the cylinder off the piston. Note:
if piston will be removed, follow instructions in following sections for removal,
replacement and readjustment of piston rod.
c.
Remove and discard the used rings and backup o-rings. Clean the ring grooves and
install new o-rings. By hand, carefully spread the new compression ring and install in the
groove. Repeat for each ring, being certain the ends of the ring fit completely into the
groove to insure proper sealing. Install rings with gap 180˚ from the ring above.
d.
Clean and inspect the cylinder bore for wear or damage (see ch. 5). Wear must be within
the tolerance specified at end of this chapter. Repair or replace as necessary.
e.
Properly orient the cylinder and, being careful to prevent side stress of the piston rod
assembly, lower the cylinder onto the piston until the top ring is reached. Compress the
top ring by hand and work the cylinder over the ring. Repeat operation for the remaining
rings.
f.
Install a new O-ring at the top of the cylinder liner.
g.
Reinstall the head per the applicable valve assembly instructions. Note: make sure valve
cutout in top of cylinder (if any) is oriented to coincide with suction valve in head.
h.
Rotate the flywheel by hand several times to be certain that the parts are free.
Summary of Contents for RIX 2V3B-4.1V Series
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