Timm's E31 840ci CHF11S Power Steering and Brake Booster
Oil and Filter Change
There are two contentious issues when changing the power steering fluid: The actual type of oil to use, and the correct filter part
number. The first is pretty easy, on the 840ci, the type of oil to use is written on the cap - and is CHF11S which is available from
many sources. The second, the correct part number is contentious because RealOEM shows the wrong part. The correct part is
32411128167 which is specified for the V12's but is the correct part for the V8's as well:
The filter and filter seals are shown with their part
numbers below:
I'm not changing all the fluid as I did this a few months ago, but was armed with the wrong filter at the time. So, I'm going to
slurp out the fluid using a couple of syringes. I will use a 100ml one to get most of it out, and a smaller one with a length of
silicone pipe to get the rest out. Have a microfibre cloth to hand and a container to put the old CHF11S oil in for disposal:
The mesh is held in place by a pair of 10mm nuts, so slurp out some oil and then measure how far down the threaded shaft the
nuts are fitted so that you don't have to guess when re-fitting and then wind off the nuts:
Lift the spring out, lift the filter out and slurp more fluid out. Use the small syringe and tube to get all the fluid out and you will
see the filter:
To get the lid of the filter off, use a couple of metal tent pegs to hook
underneath it:
Once the lid is out (no intermediate photo's as too much oil around to use the camera), the filter itself can
be lifted out by hand:
I was immediately concerned that I had the wrong filter again, but the filter is fitted with rubber end-pieces
which can be peeled off:
.....and fitted to the new filter:
To reassemble the filter in the reservoir takes a bit of jiggling, especially getting the lid and filter to centralise, but it can be felt
getting into the correct position. Fit the collar and then the mesh filter, fit the spring and wind the nuts back down to the correct
position. Refill with fresh CHF11S and then refit the lid and you are done. The fluid should just cover the screen filter (about
10mm from the top of the reservoir) with the engine NOT running and after 20 presses of the brake pedal (which will
release the fluid contained in the accumulator).
I have not mentioned pressing the brake pedal lots of times to get the fluid from the pressurised container (bomb) as I did not
need to change the fluid. But if draining the system as much as possible, press the brake pedal lots of times until the pedal
becomes hard as this removes the pressure from the bomb and releases the fluid into the reservoir.
All done, time for a cup of tea
SEARCH MEEKNET
Timm's E31 840ci CHF11S Power Steering
and Brake Booster
Oil and Filter Change
There are two contentious issues when changing the power steering fluid:
The actual type of oil to use, and the correct filter part number. The first
is pretty easy, on the 840ci, the type of oil to use is written on the cap -
and is CHF11S which is available from many sources. The second, the
correct part number is contentious because RealOEM shows the wrong
part. The correct part is 32411128167 which is specified for the V12's but
is the correct part for the V8's as well:
The filter and filter seals are shown with their part numbers below:
I'm not changing all the fluid as I did this a few months ago, but was
armed with the wrong filter at the time. So, I'm going to slurp out the
fluid using a couple of syringes. I will use a 100ml one to get most of it
out, and a smaller one with a length of silicone pipe to get the rest out.
Have a microfibre cloth to hand and a container to put the old CHF11S oil
in for disposal:
The mesh is held in place by a pair of 10mm nuts, so slurp out some oil
and then measure how far down the threaded shaft the nuts are fitted so
that you don't have to guess when re-fitting and then wind off the nuts:
Lift the spring out, lift the filter out and slurp more fluid out. Use the
small syringe and tube to get all the fluid out and you will see the filter:
To get the lid of the filter off, use a couple of metal tent pegs to hook
underneath it:
Once the lid is out (no intermediate photo's as too much oil around to
use the camera), the filter itself can be lifted out by hand:
I was immediately concerned that I had the wrong filter again, but the
filter is fitted with rubber end-pieces which can be peeled off:
.....and fitted to the new filter:
To reassemble the filter in the reservoir takes a bit of jiggling, especially
getting the lid and filter to centralise, but it can be felt getting into the
correct position. Fit the collar and then the mesh filter, fit the spring and
wind the nuts back down to the correct position. Refill with fresh CHF11S
and then refit the lid and you are done. The fluid should just cover the
screen filter (about 10mm from the top of the reservoir) with the
engine NOT running and after 20 presses of the brake pedal (which
will release the fluid contained in the accumulator).
I have not mentioned pressing the brake pedal lots of times to get the
fluid from the pressurised container (bomb) as I did not need to change
the fluid. But if draining the system as much as possible, press the brake
pedal lots of times until the pedal becomes hard as this removes the
pressure from the bomb and releases the fluid into the reservoir.
All done, time for a cup of tea
SEARCH MEEKNET
SEARCH MEEKNET