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5) Check the intake airfilters for excessive dirt and wear, wash with pure
petroleum spirit and blow compressed air in reverse direction through the
filters. Spray the outside with oil for filters with cotton fabric, reinstall the
filters. We recommend exchange of the filters every 25 hours. Also new
filters must be sprayed with filter oil.
6) Check the throttle cable and associated lever. Replace cable when worn.
7) Clean engine and radiator.
8) Check cooling system for leaks, refill coolant if necessary, check antifreeze
(data see section 1.12.2).. Check the radiator and its mounting. To check
the water pump, switch on the ignition. You should hear a buzz.
9) Remove the exhaust manifold.
For the lower bolts a shortened wrench is needed see section 7 item U.
Check the cylinders and pistons via the exhaust ports for seizing marks, for
carbon remains and for sticking piston rings. Press against the piston rings
with a suitable tool (e.g. small flat end screw driver). The rings must be
movable. Black remains on the outside of the pistons below the rings
indicate sticking or damaged piston rings, this is not acceptable.
Illuminate the combustion chamber, check for combustion deposits and for
cracks in the cylinder coating especially at the inlet and transfer ports. Use
a torch and mirror for these checks. If seizing marks or cracks are detected
the engine must not be used. Excessive combustion deposits have to be
removed. With sticking piston rings the cylinders must be removed.
Take out the piston rings and clean the grooves and the rings or replace the
rings. Remove also any combustion deposits inside the pistons.
Caution: Necessary repair work including removal of combustion deposits must
be accomplished at a certified repair station rated for such engine work.
10) Check the cylinder base for indications of leaking and/or damaged gaskets.
When gaskets are damaged or leaking they must be exchanged.
Caution: The exchange of cylinder base gaskets must be accomplished at a
certified repair station rated for such engine work.
Issued: October 2012
Copyright DG Flugzeugbau GmbH - any copy or publishing prohibited
Manual valid with the up-to-date cover page only
Maintenance Manual DG-1000M
TN1000/22
3.5
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