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Figure 4-12. Marvel-Schebler Carburetor
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TM-55-4920-405-13-P Test Stand Hydraulic System Gasoline Engine Driven Type D-5C Manual
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Figure 4-13. Zenith Carburetor, Exploded View
TM 55-4920-405-13&P
on float assembly (36) close
NOTE
to the float body, using long
nose pliers.
If the cylinder block is rebored, oversize
pistons and rings must be used.
------ --
CAUTION
.---
--
(c)
Remove the tappet inspection cover.
Do not bend, twist, or apply pressure to
Compress the valve springs with a
the float body.
standard automotive valve lifter. (See
c.
When installing idle adjusting
(d)
Wedge a rag into the opening at the
needle (17), turn it in until it
bottom of the valve chamber. Remove
seats lightly against the idle
t h e retaining locks, seats, springs,
discharge hole, then back it
and valves. Tag each valve so that
out 1-1/2 turns. This is the
you can put it back in the same guide
preliminary idle adjustment.
when you reassemble the cylinder
block. Clean the removed items and
(3)
Governor.  To repair the governor, pro-
the ports and guides in the cylinder
ceed as follows:
block of all carbon and gum deposits.
(e)
Replace valves that are burned or
( a ) Disassemble the governor. (See fig-
pitted.
(f)
Clean and check operation of the valve
(b) Replace governor gear (27) if it is
r o t a t o r s . The valve must rotate
damaged.
slightly each time it is opened. Re-
(c) Replace shaft bearing (28) and housing
place the valve rotators if they are
bearing (21) if they are damaged or
defective.
worn.
Drive out and replace the valve guides
(g)
if the clearance between the valve
(d) Replace roll pins (2) if they are worn.
stem and the valve guide is 0.007 inch
(e) Replace threaded fittings if threads
or more.
are damaged.
( f ) Reassemble the governor.
If necessary, grind the valves and
(h)
valve seat inserts. Grind the valve
(4) Cylinder Head.  To repair a cylinder head,
face at 45 degrees to the vertical
proceed as follows:
center line of the valve stem. Grind
the valve seat insert at the same 45
degree angle.  After grinding, lap the
(a) Clean the cylinder head thoroughly of
valves in place so that you see a uni-
all carbon and lead deposits.
form ring around the face of the valve.
(b) Cleaned machined mating surfaces of
Clean the valves and wash the cylinder
all particles of gasket material.
block thoroughly with a hot solution of
(c) Refinish machined surfaces with fine
soap and water. Then, wipe the
emery cloth, if necessary to remove
cylinder wall with a clean, lint-free
minor scratches.
cloth, and apply a light coating of light
engine oil.
(d) If the cylinder head has deep scratches
(i)
Reassemble the cylinder block.
on machined surfaces or is cracked,
replace the cylinder head.
( 6 ) Crankcase Assembly. To repair the crank-
(e) Use a new gasket with the cylinder
case assembly, proceed as follows:
head.
(a) Remove the screws and lockwashers
that hold crankshaft gear (figure 4-16)
(5) Cylinder Block.  To repair the cylinder
block, proceed as follows:
(a) Clean all dirt and other foreign matter
from between the cylinder fins and the
manifold ports.
(b) Rebore the cylinder block if cylinder
bores are out of round or are oversize
by more than 0.005 inch.
4-28

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