Briggs & Stratton Twin Cylinder L-Head Repair Manual page 13

1
MAINTENANCE
Maintenance Schedule
Check oil level♦
Change oil (splash lube)
Change oil (pressure lube)
Change oil filter
Change air cleaner pre-cleaner
Change air cleaner cartridge
Clean cooling system
*
Inspect/clean spark arrester
(optional accessory)
Replace spark plugs
Replace in-line fuel filter
Remove combustion chamber deposits
♦Change oil after first 5 hours, then after every 50 hours or every season.
Note 1 Change oil every 25 hours when operating under heavy load or in high temperatures.
Note 2 Clean more often under dusty conditions or when airborne debris is present. Replace air cleaner parts, if very dirty.
Fuel And Oil Recommendations
Gasoline
We recommend the use of clean, fresh, lead-free
gasoline, and the use of BRIGGS & STRATTON
GASOLINE ADDITIVE, PART #5041. Leaded gaso-
line may be used if it is commercially available and if
lead-free is not available. A minimum of 77 octane is
recommended. The use of lead-free gasoline results in
fewer combustion deposits and longer valve life.
NOTE: Some fuels, called oxygenated or refor-
mulated gasolines, are gasolines blended
with alcohols
amounts of these blends can damage the
fuel system or cause performance prob-
lems. Do not use gasoline which contains
Methanol.
If any undesirable operating symptoms occur, use
gasoline with a lower percentage of alcohol or ether.
We also recommend gasoline be purchased in small
quantities, not more than a 30 day supply. FRESH
gasoline minimizes gum deposits, and also will ensure
fuel volatility tailored for the season in which the engine
will be operated.
Lubrication
Oil has four purposes. It cools, cleans, seals and
lubricates. During normal operation, small particles of
metal from the cylinder walls, pistons, bearings and
combustion deposits will gradually contaminate the oil.
Dust particles from the air also contaminate the oil
forming an abrasive mixture which can cause wear to
all of the internal moving parts of the engine, if the oil is
not changed regularly. Fresh oil also assists in cooling.
Old oil gradually becomes thick and loses its cooling
ability as well as its lubricating qualities.
4
5 Hours
or Daily
D
or ethers. Excessive
25 Hours or 50 Hours or
Every Season Every Season
D Note 1
D Note 1
D Note 2
D
Two types of lubrication systems are available on
Briggs & Stratton ''L" head twin cylinder engines:
1. Splash Lube
2. Pressure Lube
The splash lube system consists of a gear-driven oil
slinger on vertical crankshaft models or a connecting
rod dipper on horizontal crankshaft models.
The pressure lube system consists of a direct drive oil
pump which supplies oil to all bearing journals. Model
Series 400440, 400770, 402440, 402770, 404440,
404770, 422440, 422770 and 462770 engines are
equipped with a pressure lubrication system with an
attached or remote (optional) replaceable oil filter.
Oil Recommendations
We recommend the use of a high quality detergent oil
classified "For Service SE, SF, SG" such as Briggs &
Stratton 30 weight oil Part #100005 or Part #100028.
Detergent oils keep the engine cleaner and retard the
formation of gum and varnish deposits. No special
additives should be used with recommended oils.
RECOMMENDED SAE VISCOSITY GRADES
°
F -20 0 20 32
°
C -30 -20 -10
TEMPERATURE RANGE ANTICIPATED BEFORE NEXT OIL CHANGE
* Air cooled engines run hotter than automotive
engines. Use of multi-viscosity oils (10W-30, etc.)
above 40° F (4° C) will result in high oil consumption
and possible engine damage. Check oil level more
frequently if using these types of oil.
** SAE 30 oil, if used below 40° F (4° C), will result in
hard starting and possible engine bore damage due
to inadequate lubrication.
100 Hours or 100-300
Every Season Hours
D Note 1
D Note 2
D Note 2
D
D
D
**
*
40 60 80 100
0 10 20 30 40