Quote:
Originally Posted by GT172I
I'm also in the middle of this job on my M3 DCT after doing on my 335IS DCT a few months ago. I must say it's much easier the second go around even though the side pressure filter is a little different with the oil cooler lines running across the opening.
Question for you folks having already done the job though, when pulling out the Sucking Jet Pump (28107842838-white scoop blocking the suction filter) the O-ring that goes around the upper section holding it in place fell apart. Pretty sure it was already failed but I can't find a part number or reference to an equivalent sized o-ring. I would strongly prefer not to buy a new pump for $92 just to get a $1 o-ring. Anybody else run into this issue/change that o-ring during their service?
Other advice I can share having done this 1.5 times is that it's worth it to buy the OEM pressure filter. I bought two aftermarket ones planning one each for M3 & IS from ECS but they didn't fit and required razor blade trimming of the plastic. In the multiple trial and error attempts at this I mangled one irreparably and barely got the second one in. Between that and trying to get that damn snap ring out without snap ring pliers I probably spent 3+ hours on that crap. I caved and bought $20 snap ring pliers and an OEM filter for the M3 job and had it out and replaced in 20 mins including the oil lines. WAY easier!
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Ok, so after talking to the parts guy after picking up some coolant for a flush, he confirmed they do not have an equivalent o-ring or at least he couldn't find one so I broke out the calipers and took some measurements of the old one and the groove it sits on.
ID of the groove = 22mm
Old o-ring thickness = 1.4 to 1.7mm depending on direction as it had flattened out
The 22 x 2mm I ordered originally were slightly too large and fit loose on the shaft preventing the pump from being seated. I found some Buna-N (Nitrile) O-rings in 13/16" ID x 1/16" Th (20.6 x 1.6mm) that have excellent oil resistance and temp tolerance. It fit perfectly snug for those that may find themselves in a similar situation.