BMW N54 335i Billet Water Hose Fitting 11537541992 11537544638 | MTC Motorsport

MTC Motorsport BMW N54 335i 11537541992 11537544638 Billet Water Hose Fitting

This is an OEM replacement for the plastic fitting on BMW with part number 11537541992 and 11537544638.

It fits the N54, N53 and N52 3.0-litre motors. This BMW part consists of a 25mm hose and a plastic fitting.

• N54 3.0L twin-turbo motors 335i, 335xi, 135i
• N53 (3.0L non-turbo) 2006 - 2010 325i, 330i, 525i, 525xi, 528i, 528xi, 530i, 530xi
• N52 X3
• N20 (2.0L turbo) Z4 2013
• Also fits the N55 engines using a slightly thinner O ring

This hose runs from the coolant thermostat housing to the front of the head. The plastic fitting on this hose is a known weak spot in the coolant system as it commonly cracks and leaks.

The ideal solution to the problem is to replace the fitting with one that will never wear-out, crack or leak. This fitting is a direct replacement for the stock plastic fitting with no modification to any part of the system necessary.

You just remove the end of the hose from the plastic fitting and then the fitting from the head. Then install the replacement aluminium fitting to the head and slide the hose and hose clamp over the fitting.

This is machined from billet aluminium 6061, we also supply it in bare aluminium.