5
MTH DL-110 Operating Instructions
smoke unit switch should be turned off. When storing the engine for long periods of time,
you may want to add at least 20 drops of fluid to keep the wick soaked with fluid and
prevent it from drying out. After removing the engine from storage, it is advisable to add
another 25 drops of fluid, letting the wick soak up the fluid for 15 minutes prior to operation.
SMOKE UNIT MAINTENANCE (2 and 3-Rail)
CAUTION:
Operating the engine without smoke fluid and with the smoke unit switch in the
ON position can damage your smoke unit wick, causing the wick to become hard, blackened
and unabsorbant around the heating element. When this occurs, it may be difficult for the
wick to soak up the smoke fluid resulting in poor or no smoke output. If that occurs, we
recommend that you inspect and/or replace the wick taking care to not run the engine
without fluid in the future. You can inspect the wick to see if it needs replacement by
removing the smoke unit circuit board from the smoke unit body as seen in Fig.2. After
removing the circuit board screws lift the circuit board away and inspect the wick. If the
wick is darkly discolored and hard, it should be replaced.
