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MAINTENANCE
Crusader
MC-8
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_ l 6' - ------18 _ _ _
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9c.__c..73~-l MANUAL
bearing cover or the bottom cover plate- is removed.
Check that the check valve is not sticking.
Fig.
16-19:
Oil Return Check Valve
CYLINDER HEADS
Remove the heads being careful not to damage
the gasket sealing surface. Inspect the heads to be
sure they are not cracked or warped if they are
cracked or warped they should be replaced. Check to
see that the gasket sealing surfaces are satisfactory.
Clean the old gasket material from the valve plate
and reinstall the heads using new gaskets.
Note: When reassembling any part of the com-
pressor, refer to Table I in the specifications section
for correct torque values.
VALVE PLATE
&
DISCS
DISASSEMBLY
I) Loosen the three cap screws holding the inner
Guide
~
Springs
f
'!11;),s::,lwo
G:l)
a;
tz:..
♦
Guide In
Valve
Inner Seat
Plate
Fig.
16-20:
Discharge Valve Assy.
discharge valve seat to the valve guide.
2)
Loosen cap screws holding valve guide to the
valve plate.
3) Remove cap screws holding valve plate to the
cylinder block and remove valve plate.
4) Remove valve guide from valve plate.
Inspect the suction and discharge valve discs to see
that they are not cra~k_ed or worn _beyond the limits
as shown in the Spec1f1cat10ns section, Table No. 2.
Valve plates are supplie? with inner v~lve seats.
Since the discharge valve sits on both the mner seat
and valve plate, it is important that both sur~aces
have a comparable amou_nt of wear_ and be m a
similar condition for satisfactory discharge valve
operation. A new ".'alve disc should operate satisfac-
torily when used with old valve seats because the new
disc will seat on surfaces that are of comparable
wear. An old valve disc should either be replaced or
turned over when used with new valve seats.
REASSEMBLY
Place six valve springs in the alternate holes with
the large coil in full contact with the bottom. Turn
the crankshaft so pistons are below the tops of the
cylinder sleeves.
Place the suction valve disc on the valve springs
and press it down into the recess in the valve plate.
Slide the suction valve clips as shown in Figure I 6-
22. Locate the clips so they do not cover unloader
springs. Bolt the valve plate _to the cylinder block.
Remove- the suction valve clips.
Check the discharge valve springs for proper
placement and properlr seated. ~lace t~e dischar~e
valve disc over the springs and fit the mner seat 1_n
place over the valve disc making sure the valve 1s
properly seated.
Hand tighten the valve plate. Tighten all bolts and
bend the tabs of the lockwashers and lock plates.
Fig. 16-21: Valve Plate Without Disc
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