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LUBRICATION AND
PREVENTIVE MAINTE-
NANCE INTERVALS
The following is intended as a guide
for establishing preventive mainte-
nance intervals. The recommenda-
tions given should be followed as
closely as possible to obtain long life
and optimum performance from
Series 92 engines. Intervals indicated
on the chart are time (hours or
mileage) of actual operation.
The intervals shown apply only to
the maintenance functions de-
scribed. These functions should be
coordinated with other regularly
scheduled maintenance.
The "daily" instructions apply to
routine or daily starting of an engine.
They do not apply to a new engine or
one that has not been operated for a
considerable period of time. For new
or stored engines, refer to the engine
service manual (6SE379). Follow
instructions given under Prepar-
ations for Starting the Engine the
First Time (section 13.1).
Preventive maintenance other than
the "daily" checks should be per-
formed by authorized Detroit Diesel
service outlets. These outlets have
the trained personnel and special
tools to properly perform all services.
Item 1 - Lubricating Oil
Check the oil level daily with the
engine stopped. On coach engines
equipped with running level dip-
sticks, this may be done with the
engine at idle and at operating tem-
perature. If necessary, add sufficient
oil to raise the level to the proper
mark on the dipstick. All diesel
engines are designed to use some
oil, so the periodic addition of oil is
normal.
Check Oil Level Daily
NOTICE:
If the oil level is constantly above
normal and excess lube oil has not
been added to the crankcase, con-
sult with an authorized Detroit Diesel
service outlet for the cause. Fuel or
coolant dilution of lube oil can result
in serious engine damage.
For lubricating oil change intervals,
refer to "When to Change Oil" in the
How To section of this guide. Before
adding lube oil, refer to "How to
Select Lubricating Oil" in the How To
section.
Item 2 — Fuel and Fuel Tank
Keep the fuel tank filled to reduce con-
densation. Before adding fuel, refer to
How to Select Fuel Oil in the How To
section of this guide.
Keep Tank Filled to Reduce Condensation
32
Refill the tank at the end of each
day's operation to prevent condensa-
tion from contaminating the fuel.
Condensation formed in a partially
filled tank promotes the growth of
microorganisms that can clog fuel fil-
ters and restrict fuel flow. To prevent
microbe growth add a biocide to the
fuel tank or primary fuel supply. Follow
manufacturer's usage, handling, and
safety recommendations.
Water accumulation can be con-
trolled by mixing isopropyl alcohol (dry
gas) into the fuel oil at a ratio of one
pint (0.5 liter) per 125 gallons (473
liters) fuel (or 0.10% by volume).
Detroit Diesel does not recom-
mend adding alcohol to fuel used in
marine engines.
Open the drain at the bottom of the
fuel tank every 30,000 miles or 48,000
km (300 hours for industrial applica-
tions) to drain off any water and/or
sediment.
Every 12 months or 120,000 miles
(192,000 km) (600 hours for industrial
applications) tighten all fuel tank
mountings and brackets. At the same
time, check the seal in the fuel tank
cap, the breather hole in the cap and
the condition of the flexible fuel lines.
Repair or replace the parts, as neces-
sary.
NOTICE:
A galvanized steel tank should never
be used for fuel storage, because
the fuel oil reacts chemically with the
zinc coating to form powdery flakes
which can quickly clog the fuel filters
and damage the fuel pump and
injectors.
Item 3 — Fuel Lines, Flexible
Hoses
Pre-Start Inspection—Make a visual
check for fuel leaks at all engine-
mounted fuel lines and connections,
and at the fuel tank suction and return
lines. Since fuel tanks are susceptible
to road hazards, leaks in this area may
best be detected by checking for
accumulation of fuel under the tanks.
Check hoses daily as part of the pre-
start inspection. Examine hoses for
leaks, and check all fittings, clamps,
and ties carefully. Make sure that
hoses are not resting on or touching
shafts, couplings, heated surfaces
including exhaust manifolds, any
sharp edges, or other obviously haz-
ardous areas. Since all machinery
vibrates and moves to a certain extent,
clamps and ties can fatigue with age.
To ensure continued proper support,
inspect fasteners frequently and tight-
en or replace them as necessary.
If fittings have loosened or cracked
or if hoses have ruptured or worn
through, take corrective action imme-
diately. Leaks are not only potentially
detrimental to machine operation, but
they can also result in added expense
caused by the need to replace lost
fluids.
CAUTION:
Personal injury and/or property
damage may result from fire due
to the leakage of flammable fluids
such as fuel or lube oil.
Service life—A hose has a finite ser-
vice life. With this in mind, all hoses
should be thoroughly inspected at
least every 500 operating hours (1,000
hours for fire-resistant fuel and lubri-
cating oil hoses) and/or annually. Look
33
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