Kohler Command PRO EFI ECH749 [147/180] Disassembly inspection and service
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Kohler Command PRO EFI ECH749 [147/180] Disassembly inspection and service

Kohler Command PRO EFI ECH749 [147/180] Disassembly inspection and service
Disassemble Cylinder Heads
NOTE: These engines use valve stem seals on intake
and exhaust valves. Use a new seal whenever
valve is removed or if seal is deteriorated or
damaged in any way. Never reuse an old seal.
1. Remove screws, rocker arm pivots and rocker arms
from cylinder head. Note screw color for reassembly.
2. Compress valve springs using a valve spring
compressor.
3. Once valve spring is compressed, remove valve
spring keepers, then remove following items.
● Valve spring retainers
● Valve springs
● Valve spring caps
● Intake and exhaust valve (mark position)
● Valve stem and seals (intake and exhaust)
4. Repeat above procedure for other cylinder head. Do
not interchange parts from 1 cylinder head to other.
Inspection and Service
Valve Details
A
A
A
B
B
C
D
D
E
E
F F
G
G
H
H
EXHAUST VALVE
INTAKE VALVE
INTAKE
INSERT
EXHAUST
INSERT
Dimension Intake Exhaust
A Seat Angle 89° 89°
B Insert O.D. 36.987/37.013 mm (1.4562/1.4572 in.) 32.987/33.013 mm (1.2987/1.2997 in.)
C Guide Depth 4 mm (0.1575 in.) 4 mm (0.1575 in.)
D Guide I.D. 7.038/7.058 mm (0.2771/0.2779 in.) 7.038/7.058 mm (0.2771/0.2779 in.)
E Valve Head Diameter 33.37/33.63 mm (1.3138/1.3240 in.) 29.37/29.63 mm (1.1563/1.1665 in.)
F Valve Face Angle 45° 45°
G Valve Margin (Min.) 1.5 mm (0.0591 in.) 6.982/7.000 mm 1.5 mm (0.0591 in.)
H Valve Stem Diameter (0.2749/0.2756 in.) 6.970/6.988 mm (0.2744/0.2751 in.)
Inspection
Check base surface of hydraulic lifters for wear or
damage. If lifters need to be replaced, apply a liberal
coating of Kohler lubricant (see Tools and Aids) to base
of each new lifter before it is installed.
Bleeding Lifters
To prevent a possible bent push rod or broken rocker
arm, it is important to bleed any excess oil out of lifters
before they are installed.
1. Cut a 50-75 mm (2-3 in.) piece from end of an old
push rod and chuck it in a drill press.
2. Lay a rag or shop towel on table of drill press and
place lifter, open end up, on towel.
3. Lower chucked push rod until it contacts plunger in
lifter. Slowly pump plunger 2 or 3 times to force oil
out of feed hole in side of lifter.
Disassembly/Inspection and Service
14724 690 01 Rev. O KohlerEngines.com

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