Lock Ring — a genuine BMW part, number 11 61 7 831 517. The number stamped on the part is 11617831517; BMW's catalog files it under the short number 7831517. You will find it on our Engine shelf, under Intake manifold system.
It fits the E46 coupe and convertible (M3, 2001–2006), with the S54 engine.
BMW draws it on the Intake manifold system (11_3012) diagram. It weighs about 1 g (under 0.1 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.
Every used part is inspected and graded before listing. Condition grades:
Good — minimal wear, fully functional.
Fair — normal wear, fully functional.
Acceptable — visible wear, still functional.
Returns: 30 days if a part arrives damaged or isn't what the listing described. Full policy.
Shipping: Ships within the US. Orders ship within 1–2 business days; small parcels ship free on orders of $75.00 or more. Oversize items ship at a flat $49.99 each — free shipping does not cover them.
