9
General instructions
Safety precautions for Fluorine
rubber
Fluorine rubber is a common material in sealing
rings for shafts and O rings.
When fluorine rubber is exposed to high tempera-
tures (over 300°C) it can release highly corrosive
hydrofluoric acid. Exposing the skin to this chemi-
cal can cause serious burns. If splashed in the eyes
it can cause malignant ulcers. Inhaling the fumes
can damage the respiratory passages.
WARNING! Take the greatest care when
working on engines that have been operating
at high temperatures, for example an over-
heated engine that has seized or an engine in-
volved in a fire. The seals must never be
burned off when disassembling or be burnt af-
terwards in anything other than a special dis-
posal site.
• Always used chloroprene rubber gloves (gloves
for handling chemicals) and protective goggles.
• Treat removed seals in the same way as corro-
sive acid. All remains, even the ash can be ex-
tremely corrosive. Never use compressed air
jets for blowing clean.
• Put old seal remnants in a plastic container,
close it and stick a warning label on it. Wash
gloves under running water before removal.
The following seals may contain fluorine rubber:
Crankshaft, camshaft and intermediate shaft seals.
O rings, wherever used. O rings for cylinder liner
sealing are almost always fluorine rubber.
Note that seals which have not been exposed to
high temperatures can be handled normally.
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