DG Flugzeugbau DG-800A, Руководство по обслуживанию, Страница: 57 / 163

Maintenance Manual DG-808C
Issued: July 2017 TN800/45 3.7
7. Check all fuel lines for any wear, kinks, tight fit and leaks. Check especially
the fuel lines in the engine compartment, switch on the ignition to run the
fuel pump.
8. Check the intake airfilter of the carburettor for excessive dirt and wear, wash
with pure petroleum spirit and blow compressed air in reverse direction
through the filter. Spray the outside with oil for filters with cotton fabric,
reinstall the filter.
We recommend exchange of the filter every 25 hours. Also new filters must
be sprayed with filter oil.
8.a With the airfilter still removed check visually the screws of the throttle valve
and of the choke valve (if existent) for tight fit.
9. Check all cables and associated levers and the propellerbrake (see sect.
1.11.8 and 1.11.9). Replace levers and pins of the brake in case of excessive
free play. Replace cables when worn.
10. Clean engine and radiator
11. Check cooling system for leaks, refill coolant if necessary, check antifreeze
(data see section 1.11.2). Check the radiator and its mounting. Check the
coolant hoses.
To check the water pump, switch on the ignition. You should hear a buzz.
12. Cylinder and pistons
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 or by a certified mechanic rated for
such engine work.