Kohler KT19 series II User Manual

Crankcase vacuum check is best accomplished
with the "U" tube manometer.
Vacuum gauges, mercury and water manometers
are available commercially. However, a simple
"U" tube manometer can easily be constructed.
See "Section 1 Special Tools" for instructions.
An engine in good condition will have crankcase
vacuum of 15 inches (minimum) water column as
read on "U" tube water manometer, or 1.10 inches
(minimum) Hg as on mercury vacuum gauge.
Crankcase Vacuum Test
To test crankcase vacuum with a manometer:
1. Insert stopper in oil fill hole, leave other end of
tube open to atmosphere. Make sure shut-off
clamp is closed.
2. Start engine and run at high speed-3200 to
3600 rpm.
Compression Test
To check compression, remove spark plugs, insert
compression gauge in each spark plug hole, set the
throttle and choke to the wide open position, insure
that air intake and exhaust systems are not re-
SECTION 2
TROUBLESHOOTING
3. Release the clamp and note the water level in the
tube. The level in the engine side should be 15-
20" above the level in the open side. If there is no
vacuum or a positive pressure, check for the
following conditions:
NOTE: Clamp must be closed before stopping
engine.
a. Crankcase breather clogged or inoper-
ative. Disassemble breather, clean parts
thoroughly, reassemble, and recheck pressure.
b. Seals and/or gaskets leaking. Check for
proper sealing of crankcase.
c. Blow by or leaky valves. Confirm by test-
ing compression.
d. Exhaust restriction. Check for defective
muffler.
stricted, and motor engine using the starting
motor. Take several readings on both cylinders. A
difference in pressure reading between cylinders
in excess of 15%, or readings below 90 PSI can
indicate the following:
LOW COMPRESSION
Possible Cause Remedy
A. Cylinder head gasket blown. A. Remove head. check for flatness, replace gasket,
reinstall head, recheck compression. Locate and
correct the cause of initial failure.
B. Cylinder head warped or loose.
B. Remove head, check for flatness (see cylinder head
service).
Locate and correct the cause of initial failure.
c. Piston rings worn- blowby occurring. C. Recondition engine.
D. Valves leaking. D. Recondition valves and seats.
E. Excessive combustion deposits. E. Remove head and clean combustion deposits from
combustion chamber.
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Kohler KT19 series II Specifications

General

Brand	Kohler
Model	KT19 series II
Category	Engine
Language	English