Excessive Oil Consumption; Low Oil Pressure; Engine Overheats; Excessive Fuel Consumption - Husqvarna Z400 Series Service Manual

REPAIR

Excessive Oil Consumption

Diagnostic Checks
Are there any oil leaks
present?
Is crankcase overfilled
with oil?
Is breather valve
clogged or breather
drain plugged?
Is the cylinder
compression correct?

Low Oil Pressure

Diagnostic Checks
Is oil level correct?
Is oil filter clogged?
Is the correct oil
viscosity used?
Is the oil free of
gasoline?
Results
YES: Repair leaks as
necessary.
NO: Go to next check.
YES: Adjust oil level.
NO: Go to next check.
YES: See authorized
Husqvarna dealer
for assistance.
NO: Go to next check.
YES: Checks complete.
NO: See authorized
Husqvarna dealer
for assistance.
Results
YES: Go to next check.
NO: Add oil as
necessary.
YES: Replace oil filter.
See "Engine Oil
and Filter Change"
on page 3-4.
NO: Go to next check.
YES: Go to next check.
NO: Replace oil with
correct oil. See
"Engine Oil and
Filter Change" on
page 3-4.
YES: Checks complete.
NO: Check piston
rings. See
authorized
Husqvarna dealer
for assistance.

Engine Overheats

Diagnostic Checks
Is the flywheel screen
free of debris?
Are engine cooling
shrouds in place?
Is the flywheel fan and
engine cooling fins free
of obstructions and not
damaged?
Is engine oil at the
correct level and
viscosity?

Excessive Fuel Consumption

Diagnostic Checks
Is choke adjusted
correctly?
Is the fuel level correct
in the float chamber of
the carburetor?
Is the carburetor pilot
screw adjusted
correctly?

Contamination of Crankcase

Diagnostic Checks
Is the crankcase oil
free of fuel and debris?
5-22
Results
YES: Go to next check.
NO: Clean flywheel
screen.
YES: Go to next check.
NO: Repair or replace
cooling shrouds as
necessary.
YES: Go to next check.
NO: Repair or replace
parts as
necessary.
YES: Checks complete.
NO: Add or change
engine oil as
needed.
Results
YES: Go to next check.
NO: Adjust choke. See
"Check and Adjust
Choke Cable" on
page 4-5.
YES: Go to next check.
NO: See authorized
Husqvarna dealer
for assistance.
YES: Checks complete.
NO: See authorized
Husqvarna dealer
for assistance.
Results
YES: Checks complete.
NO: Change engine oil
and filter. See
"Engine Oil and
Filter Change" on
page 3-4.
NO: See authorized
Husqvarna dealer
for assistance.
Z400 Series