ReferenceModification no.
- 0 -
Page
95
Date
1997 02 01
Main
914 F
01477
12.3.10)Oil filter — replacement and inspection
See Pic. 024 and 025.
Unscrew oil filter with filter wrench, part
no. 877 620. At every oil change replace
the oil filter and open the old one with
special tool, part no. 877 670 not produc-
ing chips. Remove filter insert, cut top and
bottom cover off the mat. Remove filter
mat, unroll and check it for metal chips,
foreign matter, contamination and abra-
sion. This check is important as it allows
conclusions regarding the condition of the
engine and gives information about a pos-
sible cause of failure.
â– ATTENTION: It is absolutely necessary
to scrutinize the filter insert.
Possible foreign matter: Steel chips, bronze chips, aluminium chips, sliver
of plain bearing ma-terial, remains of sealing com- pound.
â– ATTENTION: If an increased amount of metal particles is found, like brass-
or bronze chips or sliver from bearings, search for the cause
and correct!
For correct judgement long-term experience in repair of piston engines is
required.
If the filter mat is clogged by foreign matter, the lubricating oil flows unfiltered
back to the oil pump via the bypass valve in the oil filter. The unfiltered oil
arrives at the parts to be lubricated.
â– ATTENTION: To warrant the function of the oil circuit and the forced flow
lubrication, use genuine oil filter only. Only these filters
assure correct pressure in the bypass valve.
Slightly lubricate the rubber seal of the new oil filter. Screw oil filter on by hand.
Then tighten an extra 3/4 turn.
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