BEECHCRAFT
Duchess
76
ENGINE BREAK-IN INFORMATION
Section
VII
Systems
Description
New engines have been carefully run-in by the engine manu-
facturer. However, the engines should be operated on
straight mineral oil for a minimum of 50 hours or until oil
consumption stabilizes. After the first
25
hours
of
operation,
drain and replace the mineral oil. A change to an approved
engine oil should be made after the break-in period. Refer to
Lycoming Engine Operator's Manual.
NOTE
In
order to promote proper
ring
seating, cruise
power settings of 65% to 75% should be used
until a total of 50 hours has accumulated or until
oil consumption has stabilized. This recommen-
dation is applicable to in-service engines follow-
ing cylinder replacement or top-overhaul
of
one
or more cylinders, as well
as
to new engines.
ENGINE LUBRICATION
The engines are equipped with a wet-sump, pressure-type oil
system. Each engine sump has a capacity
of
8 quarts. The oil
level may be checked through the access
door
in each en-
gine cowling. A calibrated dipstick attached
to
the filler cap
indicates the oil level. Due
to
the canted position
of
the
engines, the dipsticks are calibrated for either right
or
left
engines and are not interchangeable.
Oil operating temperatures are controlled by an automatic
thermostat bypass control. The bypass control will limit the oil
flow through the oil cooler when operating temperatures are
below normal, and will permit the oil
to
bypass the cooler if it
should become blocked.
ENGINE ICE PROTECTION
The possibility
of
induction system icing is reduced by the
carburetor air heat system.
August,
1980
7-19
To Next Page
Loading...
