Perkins 4006 User Handbook Manual page 40

MAINTENANCE PROCEDURES
WARNING
OTHER MEANS OF STARTING. ALWAYS
WEAR PROTECTIVE GLOVES.
CHANGING THE OPTIONAL CHANGE-
OVER LUBRICATING OIL FILTERS
These special duplex filters are normally
intended for use on long running engines, or
where a servicing requirement may occur
when it is impractical to stop the engine. For
this reason they are fitted with a three way
change-over valve in the head which
enables the elements to be changed, one at
a time, whilst the engine continues to run.
They are normally mounted on the engine,
but may be remotely
connected to the engine by means of flexible
pipes.
Fig. 31
36
DISCONNECT
BATTERIES OR ANY
mounted,
NOTE: If the flexible connections to the filter
are removed for any reason, it is essential
that they are reconnected correctly to avoid
unfiltered oil getting into the engine. See Fig.
31. Failure to change filters when due can
also lead to trouble from unfiltered oil.
CHANGING THE FILTER ELEMENTS
WHEN THE ENGINE IS STOPPED
All that is necessary is to unscrew the
canisters with a strap wrench as shown in
Fig. 31, without moving the change-over
valve, as there is no pressure in the system
when the engine is stationary. The underside
of the header is then wiped clean, and a
smear of oil applied to the sealing rings on
the new canisters, before screwing them up
and
by hand and tightening them by no more
than three quarters of a turn after the seals
contact the header. Check the filter for leaks
after the engine is restarted.
4006/8 Diesel, May 1998