 |
 |
 |
 |
|
 |
 |
http://www.ultralightnews.ca/ Page 24 of 36
The Ultralight News - your one stop Ultralight News.
5.8Inspecting the fuel lines
Check the fuel lines between fuel ? electric fuel pump, injectors and fuel tank for leakages and/or other
damage. Replace leaking and/or damaged fuel lines.
5.9Inspecting pulsation lines
Check the pulsation line between the vacuum nipple on the crankcase and the pulse connection of the fuel ?
diaphragm pump for leakage and/or other damage. Replace the leaking and/or damaged pulsation line.
5.10Spark plugs and sparkplug leads
It is recommended that the spark plugs be checked one after the other to avoid mixing up the sparkplug leads
and their connecting positions.
5.11Inspecting the condition of the sparkplug leads
Remove the sparkplug leads and check the contact socket inside for corrosion. Check the SAE-contact (the
screwed on contact hood) of the sparkplug for corrosion or "deposits". If there is corrosion or "deposits",
replace the sparkplug lead and SAE- contact of the sparkplug (usually here the sparkplug would be
completely exchanged - see next paragraph).
5.12Installing and removing sparkplugs
To uninstall the sparkplug, remove the sparkplug lead. Loosen the sparkplug with the sparkplug wrench and
unscrew it.
Before installing the new or still serviceable sparkplug, the air gap (0.8 mm) is to be checked with a feeler
gauge and adjusted as required.
Screw the sparkplug into the cylinder head with a sparkplug wrench and torque to the correct setting.
5.13Condition of the sparkplug
The spark plug should have a dry bright brown colour tone on the central electrode, the insulator of the
central electrode and the earth side of the case. If the colour tone changes to a bright very dry grey, the
engine is running very hot and the mixture is too lean. Where there is a wet dark brown to black colouring,
the engine is running with too thick a mixture. In both cases, AATI Pty Ltd or your Hirth distributor should
be contacted.
Check the sparkplug central electrode and earth strap for corrosion (burning). If signs of burning are
detected, the sparkplug should be replaced. For more information on how to read sparkplugs, go to the
maintenance pages on the http://www.ultralightnews.ca/web site.
5.14Fan
It is necessary that the opening for the fan remain unobstructed. Only sufficient flow of fresh air and
satisfactory operation of the fan can guarantee proper cooling of the engine.
5.15Remove and assembling the air cowl.
To remove the air cowl, remove the sparkplug leads and unscrew the sparkplugs. Mark the position of the
sparkplug leads. Remove entire muffler after the elbow in the exhaust manifold (see later chapter. Remove
both screws to the crankshaft housing underneath the elbow of the exhaust manifold. Then remove the screws
to the fan housing on the side of the cool air exit. Pull off the shroud over the elbow of the exhaust manifold.
To install the shroud, reverse the process used for removal. Should there be any damage to the shroud, it has
to be replaced immediately.
|
|
