Kohler Command Pro EFI ECH940 Service Manual page 75

Recondition valve seat inserts following instructions provided with valve seat cutter being used. Final cut should
be made with an 89° cutter as specifi ed for valve seat angle. Cutting proper 45° valve face angle as specifi ed, and
proper valve seat angle (44.5°, half of full 89° angle), will achieve desired 0.5° (1.0° full cut) interference angle where
maximum pressure occurs on outside diameters of valve face and seat.
Lapping Valves
Reground or new valves must be lapped in, to provide proper fi t. Use a hand valve grinder with a suction cup for fi nal
lapping. Lightly coat valve face with a fi ne grade of grinding compound, then rotate valve on its seat with grinder.
Continue grinding until a smooth surface is obtained on seat and on valve face. Thoroughly clean cylinder head in
soap and hot water to remove all traces of grinding compound. After drying cylinder head, apply a light coating of SAE
10 oil to prevent rusting.
Valve Stem Seals
These engines use valve stem seals on intake and exhaust valves. Always use new seals when valves are removed
from cylinder head. Seals should also be replaced if deteriorated or damaged in any way. Never reuse an old seal.
Breather/Closure Plate/Oil Reservoir Components
N
T
U
A Closure Plate
E Pickup Tube
I Oil Reservoir
Crankshaft
M Non-Thrust Bearing
(PTO)
Q Breather Gasket
U Oil Seal
62 690 13 Rev. A
S
O
P
D
R
C
A
B
G
E
B Gerotor Gears
F Clamp
J Drain Plug
N Dipstick
R Filter
KohlerEngines.com
Disassembly/Inspection and Service
Q
M
L
F
G
H
I
C Oil Pump O-ring
G Inlet Seal
K Gasket
O Dipstick Tube
S Breather Hose
J
K
J
D Oil Pump Housing
H Pickup Screen
L Closure Plate Gasket
P Breather Assembly
T Lifting Strap
75