Kalle Vaaraniemi wrote:
Engine has been inactive inc maintenance from 08/2006 - now.
Fourteen years is a very long time for an engine just to be sitting somewhere.
Actually, the engine is past its TBO calendar time now - so technically it's due for overhaul before you put it back into service.
In the operator's manual (section 8.1) there is a specified protocol for preserving the engine if its going into storage
The Operator's Manual section 8.1 gives the procedure for putting the engine into storage, and section 8.2 discusses putting the engine back into operation:
" If preservation (including oil change) took place within a year of
storage, oil renewal will not be necessary. For longer storage
periods repeat preservation annually. "
The line maintenance manual (section 05-10-00) specifies:
" Observe the storage and preservation directives!
NOTE
The maximum possible storage period of the engine is limited to 24 months.
If this period is exceeded, the engine must be sent to a ROTAX® authorized overhaul facility for inspection.
"
The Installation manual (section 10-10-00) advises:
" If the engine is stored for a period longer than 12 months (not stored in the
GENUINE-ROTAX packing) then maintenance tasks must be carried out
every 3 months as per the currently valid Maintenance Manual, section
“Preservation of a new engine“. "
The Heavy Maintenance Manual (section 71-00-00) notes:
"If the engine is stored longer than 12 months, the following inspections must be
carried out every 3 months:
- Remove one spark plug on each cylinder and turn crankshaft by hand 2 full
turns. Refit spark plug.
- Visual inspection for corrosion (e.g. on propeller shaft). If corrosion is detected,
the engine must be sent immediately to an authorized overhaul facility for
inspection.
▲ WARNING: The engine must not be taken into operation.
◆ NOTE: The maximum possible storage period of the engine is limited to
24 months.
If this storage period is exceeded, inspect following steel components for
corrosion:
- camshaft, crankshaft, gear set and propeller shaft
If corrosion is detected, the engine must be sent immediately to an authorized
overhaul facility for inspection. "
And that's for a new engine... Section 5.2 gives directives for an engine which has been in operation:
■ CAUTION: Maximum storage period 12 months if the listed precautions are
taken!
– Oil change see latest issue Maintenance Manual (Line Maintenance) for the
respective engine type, 912 Series or 914 Series.
– On the ROTAX 912 Series: Run the engine to allow it to warm up, leave it
running at increased idle speed, remove the air filters and inject approx. 30
cm3 of preservation oil into the carburetors, shut down the engine.
– On the ROTAX 914 Series: Remove the top spark plugs from all four
cylinders and spray preservation oil into the cylinders through the spark plug
bores.
Turn the crankshaft several times.
Fit spark plugs and spark plug connectors.
– Drain carburetor float chambers.
– Apply engine oil to all linkages on carburetors.
– Close all openings on the cold engine, such as the exhaust pipe, venting tube
and air filter intake against entry of dirt and humidity.
– Spray all external engine steel parts with preservation oil.
– In the event of longer out of service periods repeat the whole preservation
procedure annually.
Section 5.3 ' Returning the engine to service" specifies:
" – Complete 100 hour inspection if engine has been out of service for more than
one year. "
You can download the compete set of your engine manuals from here:
https://www.rotax-owner.com/en/support-topmenu/engine-manuals#912-series-engines
