Buy the complete S14 water pump instead of rebuilding the bearing
The bearing and seal shown in the catalog are NLA, so owners replace the whole pump. Several owners advise the BMW pump (catalog lists exchange pump 11511315211) over cheap aftermarket pumps; Laso pumps were reported leaking or wobbling after 3k-10k miles by some, while one owner had 30k miles on one. Do not over-tighten the belt.
Parts / numbers mentioned: 11511315211 (exchange water pump), Laso, GMB
- S14.netWater Pump Rebuild ↗checked 2026-10-01 · read via search-engine copy (forum blocks direct access)
- S14.netWater pumps, OEM rebuilt or aftermarket? ↗checked 2026-10-01 · read via search-engine copy (forum blocks direct access)
- R3VLimitedE30 M3 Water pump ↗checked 2026-10-01