Maintenance Schedule - Briggs & Stratton 85400 Operating & Maintenance Instructions

Maintenance
(see figs.
See Maintenance Schedule. Follow the hourly or
calendar intervals, whichever occur first. More frequent
service is required when operating in adverse conditions.
To prevent acci
dental starting, re
move spark plug
wire Ê and ground
it before servicing,
and disconnect battery at negative terminal, if equipped.
Oil service (see fig. )
Check oil level regularly.
Be sure correct oil level is maintained. Check every 8
hours or daily, before starting engine. See oil filling
procedure under Oil Recommendations.
Change oil.
Change oil after first 5 hours of operation. Change oil
while engine is warm. Refill with new oil of recom
mended SAE viscosity grade.
Air cleaner service (see fig. )
Ë
Replace pre cleaner , and/or cartridge
or damaged.
1. Loosen screws. Remove cover and air cleaner
assembly from base.
Í
2. Remove cartridge (retainer
pre cleaner.
To service pre cleaner, wash in liquid detergent and
water. Squeeze dry in a clean cloth. Saturate in engine
oil. Squeeze in clean, absorbent cloth to remove ALL
EXCESS oil.
To service cartridge, clean by tapping gently on a flat
surface. Do not use petroleum solvents, e.g., kero
sene, which will cause cartridge to deteriorate. Do not
use pressurized air, which can damage cartridge. Do
not oil cartridge.
3. Reinstall pre cleaner on retainer, if equipped.
4. Install pre cleaner in cover with mesh side toward
cartridge. Install cartridge in cover or on base.
5. Seat cover and air cleaner assembly squarely
Î Ï
onto base (tabs into slots
6. Tighten cover screws securely.
Check valve clearance:
intake is .05 mm and exhaust .10 mm.
Maintenance Cont'd
)
Spark plug service (see fig.
DO NOT crank engine with spark plug removed. If
engine is flooded, place throttle in FAST and crank until
engine starts.
Spark plug gap Ì should be .76 mm or 0.030 in.
Replace spark plug every 100 hours or every season,
whichever occurs first. Spark tester and spark plug
wrench are available from any Authorized Briggs &
Stratton Service Dealer.
Note: In some areas, local law requires using a resistor
spark plug to suppress ignition signals. If this engine
was originally equipped with resistor spark plug, use
same type of spark plug for replacement.
Keep engine clean (see figs.
Ì
if very dirty
Periodically remove chaff and debris build up from
engine. Do not spray engine with water to clean
because water could contaminate fuel. Clean with a
brush or compressed air.
, if equipped) and
To assure smooth operation, keep governor linkage,
springs and controls free of debris
If muffler is equipped with spark arrester screen
remove spark arrester screen for cleaning and inspec
tion every 50 hours or every season. Replace if
damaged.
Clean cooling system. Chaff or debris may clog engine's
, if equipped).
air cooling system, especially after prolonged operation.
Internal cooling fins and surfaces may require cleaning
to prevent overheating and engine damage. Remove
blower housing and clean as shown
)
DO NOT check for spark with
spark plug removed. Use
only Briggs & Stratton Spark
Tester Ë, to check for spark.
)
Í
.
Accumulation of debris around muf
fler Î could cause a fire. Inspect and
clean before every use.
Î
Ë
Clean fuel filter screen . Drain fuel
tank or close fuel shut off valve
before cleaning filter.
Ï
.
4

Maintenance Schedule

Follow the hourly or calendar intervals, whichever
occur first. More frequent service is required when
operating in adverse conditions noted below.
First 5 Hours
D Change oil
Every 8 hours or daily
D Check oil level
D Clean around muffler, springs and linkages
Every 25 hours or every season
D Change oil if operating under heavy load or
high ambient temperature
D Service air cleaner pre cleaner*
Every 50 hours or every season
D Change oil
D Clean and inspect spark arrester, if equipped
D Clean fuel filter
Every 100 hours or every season
D Service air cleaner cartridge*
D Replace spark plug
D Clean cooling system*
Every season
D Check valve clearance
* Clean more often under dusty conditions,or
when airborne debris or chaff is present.
Partial List of Genuine Briggs & Stratton Parts
Briggs & Stratton (or equivalent)
Part
,
Oil (20 oz.) . . . . . . . . . . . . . . . . . . . . . . . .
Oil (48 oz.) . . . . . . . . . . . . . . . . . . . . . . . .
Oil pump kit (uses standard electric drill
to remove oil from engine quickly)
Fuel stabilizer (1 oz., 30 ml single use pouch) 992030
Fuel stabilizer (4.2 oz., 125 ml bottle) 999005E (5041)
Air cleaner cartridge (85400)
Air cleaner pre cleaner (85400)
Air cleaner cartridge (115400)
Air cleaner pre cleaner (115400)
Square air cleaner cartridge (117400,
138400) and (115400, 185400 - if equipped)
Square air cleaner air cleaner pre cleaner
(117400, 138400) and (115400, 185400 - if equipped)
Air cleaner cartridge (185400, 235400, 245400) 710266
Air cleaner pre cleaner (185400,235400,245400)710268
Resistor spark plug (except model 118400)
Resistor spark plug (model 118400)
Long life platinum spark plug
(used on most OHV engines except model 118400)
Spark tester . . . . . . . . . . . . . . . . . . . . . . . .
Spark plug wrench . . . . . . . . . . . . . . . . . . .
Part No.
100005
100028
. . . . . . 5056
. . . . . . . . . . . 710265
. . . . . . . . . 710267
. . . . . . . . . . . 494511
. . . . . . . . . 495246
. . . . . 491588
. . 491435
. 491055E
. . NGK BPR6HS
. . . . . . . . . . . . . 5066
19368
19374