BMW N54 335i Billet Water Hose Fitting | MTC Motorsport | Replaces 11537541992 and 11537544638
Upgrade the weak plastic coolant fitting on your BMW with this MTC Motorsport billet aluminium water hose fitting. Designed as a direct OEM replacement for BMW part numbers 11537541992 and 11537544638, this precision CNC-machined 6061 aluminium fitting eliminates cracking and leaks, restoring long-term reliability to your cooling system.
At Nforcd we have used and fitted these on customer cars and our own cars with excellent results. Customers choose this upgrade as a preventative fix for the known plastic fitting failure, especially on tuned or hard-driven cars. Strong, simple and effective.
Why choose this billet water hose fitting
- Direct replacement for OEM plastic fitting with no modification required
- CNC machined from high quality 6061 aluminium for durability and heat resistance
- Addresses a known weak point that commonly cracks and leaks
- Straightforward install: remove old plastic fitting, push the hose onto the new billet fitting and secure with the hose clamp
- Bare aluminium finish
Fits the following BMW engines and models
- N54 3.0-litre twin-turbo: 335i, 335xi, 135i
- N53 3.0-litre non-turbo 2006 to 2010: 325i, 330i, 525i, 525xi, 528i, 528xi, 530i, 530xi
- N52: X3
- N20 2.0-litre turbo: Z4 2013
- Also fits N55 engines when used with a slightly thinner O-ring
This hose fitting sits on the hose that runs from the coolant thermostat housing to the front of the cylinder head. The factory plastic piece is known to be a weak spot; upgrading to billet aluminium is the ideal solution to prevent leaks and cooling system headaches.
Part numbers and cross-reference
Replaces BMW OEM part numbers: 11537541992 and 11537544638.
Installation and fitting
Direct-fit replacement for the stock plastic fitting. Remove the hose from the original plastic fitting, remove the fitting from the head, install the billet aluminium fitting to the head, then slide the hose and clamp over the new fitting. If fitting to an N55 engine, use a slightly thinner O-ring as required.
Professional installation available at Nforcd in Warwickshire. Request a fitting quote: Sales@nforcd.com.
Material
Machined from billet aluminium 6061. Supplied in bare aluminium.
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