Specifications

6
3
NOTE: SPECIFICATION TABLES BEGIN ON PAGE 11 OF THIS SECTION.
9. Complete test by performing steps 10 through 11.
10. Listen for air leaking from cylinder head gasket,
carburetor, exhaust system and either crankcase
breather or high oil fill dipstick tube.
a. Air flowing between cylinder and cylinder
head indicates that cylinder head gasket is
leaking.
b. Air flowing from carburetor indicates air is
leaking past intake valve and seat.
c. Air flowing from crankcase breather tube or
high oil fill dipstick tube indicates air is leaking
past piston rings.
d. Air flowing from exhaust system indicates air
is leaking past exhaust valve and seat.
11. Disconnect outlet hose from tester before
removing from spark plug hole.
12. When test is complete, push regulator lock nut in
and turn regulator lock nut counterclockwise as far
as it will go to release pressure in combustion
chamber.
Remove Cylinder Head and Shield
Note the position of individual cylinder head bolts
during removal to ensure proper reassembly. Bolts
used in the wrong position may be too short and not
engage enough threads, or may be too long and
bottom on a fin, either breaking the fin or leaving the
cylinder head loose. Position of long bolts (1), Fig. 4.
Fig. 4
3
2
5
7
1
4
6
A
2
3
7
6
19
4
8
5
3
2
8
6
4
9
1
7
5
485
2
376
1
1
1
B
CD
Cylinder Head Assembly and
Torque Procedure
Assemble the cylinder head with the cylinder head
shield and a new head gasket.
Do not use sealer of any kind on gasket. Install head
bolts and snug up evenly. Then use a torque wrench to
tighten head bolts to the torque specified in Table
No. 2, page 11, in the sequence shown, Fig. 4.
A: Model 100700, B: Aluminum cylinder engines 15 cu.
in. and less except 100700. C: Aluminum cylinder
engines 17 – 28 cu. in. D: Cast iron Models 230000,
240000, 300000, 320000.
If head bolts are not tightened in sequence, the
result could be a warped head.
VALVES
Remove Valves
CAUTION
ALWAYS wear Safety Glasses during valve
spring removal and installation.
Fig. 5 shows three methods used to hold valve spring
retainers or rotators.
Stem (1)
Pin (2)
Collars (3)
Retainer (4)
Fig. 5
AB C
1
2
3
1
3
4