Kohler ECV940 Service Manual page 132

Disassembly/Inspection and Service
Adjustable Valve
Y
Train (AVT)
Roll Pin (Aluminum
AC
Valve Cover)
Remove Spark Plugs
Remove spark plug from each cylinder head.
Remove Valve Covers
Plastic Valve Covers
1. Remove screw and grommet securing each valve
cover.
2. Remove valve cover and seal from each cylinder
head. Note locations of individual valve covers if
they are diff erent.
Aluminum Valve Covers
NOTE: A new valve cover seal must be installed
whenever an aluminum valve cover is removed
from cylinder head.
1. Remove screw and O-ring securing each valve
cover.
2. Remove valve cover and seal from each cylinder
head. Remove seal from valve cover; discard seal.
Remove Cylinder Heads and Hydraulic Lifters
NOTE: Exhaust lifters are located on output shaft side
of engine while intake lifters are located on fan
side of engine. Cylinder head number is
embossed on outside of each cylinder head.
1. Non-adjustable Valve Train
a. Remove rocker arm screws, rocker arm pivots
and rocker arms.
Adjustable Valve Lash
a. Loosen set screws and remove adjusting nuts on
rocker arm pivot studs.
b. Remove rocker arm pivot and rocker arms.
2. Remove pipe plug from cylinder head to access
screw in center location.
3. Remove screws securing each cylinder head. Note
locations of washers and spacer.
4. Mark position of push rods as either intake or
exhaust and cylinder #1 or #2. Push rods should
always be reinstalled in same positions.
5. Carefully remove push rods, cylinder head, and
head gasket.
6. Repeat procedure for other cylinder head.
7. Remove lifters from lifter bores. Use a hydraulic lifter
tool. Do not use a magnet to remove lifters. Mark
lifters by location, as either intake or exhaust and
cylinder #1 or #2. Hydraulic lifters should always be
reinstalled in same position.
132
Z Rocker Arm Screw
Valve Cover
AD
(Aluminum)
KohlerEngines.com
Non-adjustable
AA Valve Train
(Non-AVT)
O-Ring (Aluminum
AE
Valve Cover)
Inspection
Check base surface of hydraulic lifters for wear or
damage. If lifters need to be replaced, apply a liberal
coating of Kohler lubricant to base of each new lifter
before it is installed.
Bleeding Lifters Style A (Ribbed)
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.
Bleeding Lifters Style B (Smooth)
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. Lay a rag or shop towel on table of drill press. Place
an 8 mm (5/16 in.) socket on towel with well end up,
then place open end of lifter on socket. Ensure
socket does not contact lifter ball surface.
2. Place some material, such as wood, plastic, or
aluminum on top of lifter to protect lifter fi nish.
3. Lower drill press chuck until it contacts material on
lifter. Slowly pump lifter 2 or 3 times to force oil out of
feed hole in side of lifter.
Valve Cover Seal
AB (Aluminum Valve
Cover)
Screw (Aluminum
AF
Valve Cover)
62 690 05 Rev. H