28/08/2026
N55 valve stem seals aren't for the faint hearted π
We had this stunning 135i in recently for an oil smoke issue, after finding initially the turbo to have excessive play on the impeller shaft, we proceeded to replace it with a Pure Turbos Pure500 for a bit more power π₯
Unfortunately this helped with the oil smoke slightly but it still produced smoke, after digging further we found the exhaust stem seals to be worn out causing the smoke.
Whilst carrying out the repair we also sorted the lack of PCV vacuum and the customer went ahead with a timing chain replacement just incase.
With these engines they also require specialist tooling to align the exhaust camshaft, if you need this sorting we can help, so make sure you get in contact π
For all work, race, track, road or classic, call us anytime for a quote
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π 07579761576
π§[email protected]
π±www.chaferracingdevelopments.co.uk
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