9 Repair
BBW 46 / DBW 46
902
9.1.2.1 Replacement of Temperature Fuse against
Temperature Limiter with Reset
General
Several reasons (e.g. unfavourable installation location,
wrong manual control during operation) favour the
premature response of the temperature fuse. Therefore
we recommend the replacement of the temperature fuse
(1) against a temperature limiter with a reset facility (2).
This component may be ordered with order no. 14865A.
CAUTION
A replacement is only possible on heaters with a flange
connection (3) on the heat exchanger (water inlet), or on
heaters from June 1988 and up, or on heaters with serial
number 71771 (BBW 46) and 38177 (DBW 46) and up.
On heaters without flange connection the heat exchanger
may suffer damage in case of overheat condition.
Procedure
WARNING
When performing the replacement with the heater
installed allow coolant to cool down sufficiently to avoid
skin burns. Also depressurise cooling system and refit cap
afterwards.
1. Remove top cover (4).
2. Open locking tab and separate lower portion of
connector support (5). With wiring harness connected
pins remain fixed in connector. Disconnect wire (blue)
from connector base, terminals 11 and 12.
3. Carefully remove temperature fuse (1). There is a
probability of water leakage.
4. Apply high temperature grease Copaslip (order no.
105898) to thread of temperature limiter. Manually
screw in temperature limiter (2) and using a fork
wrench (size 16) tighten with a max. of one third of a
turn. Maximum torque 1.5 Nm.
5. Reconnect wires to connector base. The temperature
limiter electrical connections cannot be mixed up. The
brown and the blue wire may be connected either to
terminal 11 or 12.
9.2 Disassembly and Assembly
9.2.1 Electrical Connections
9.2.1.1 Breaking Electrical Connections
NOTE
All electrical connections with exception of the glow plug
cable are joined in the electrical connector.
1. Slide top cover in direction of arrow and lift, then slide
back and loosen from rear lock wedge.
2. Remove rubber grommet.
3. Disconnection of round connector:
Using screw driver open locking tab of 12 pin
connector and fold down lower part of connector.
Remove pins from connector.
4. Disconnection of glow plug connector:
Using screw driver push locking tabs of glow plug
connector (next to 12 pin connector) apart and lift glow
plug connector.
* Serial number
5
4
*
1
2
3
Section A-B
(41 Seiten)
(18 Seiten)
(72 Seiten)
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