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BimmerFix® | Permanent BMW N62 & N73 Coolant Pipe Weep Hole Repair

 

Stop the Dreaded BMW “Weep Hole” Coolant Leak

Save $5,000+ in labor costs with the original, patented BimmerFix® Stent System. No engine removal or intake manifold teardown required.

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The $5,000 Problem

BMW N62 V8 and N73 V12 engines feature a central coolant transfer pipe. Over time, the front seal fails, causing antifreeze to leak through a “weep hole” in the timing chain cover. Traditional repairs require **removing the entire engine** or cutting the pipe costing you thousands in specialized labor.

The Symptoms: Low coolant warnings, sweet smells from the engine bay, and puddles of blue or green fluid under the front of your car.

On the BMW N62 V8 engine, the coolant transfer pipe is a long aluminum tube that runs through the engine’s center “valley,” carrying coolant from the water pump at the front to the rear engine passages.

The “Weep Hole” Leak Phenomenon
The primary failure point is a rubber seal bonded to the front of this pipe where it meets the timing chain cover.
  • The Leak Path: When this seal shrinks or fails, coolant escapes into the timing cover and then drips out of a small 5mm weep hole located behind and slightly to the left of the water pump.
  • The Traditional Fix: Replacing the entire pipe usually requires removing the timing chain cover and cylinder heads, a labor-intensive job that can cost between $7,000 and $10,000.
Repair Options Diagrammed
  1. BimmerFix Stent System: A high strength aluminum sleeve is inserted through the front of the timing cover (after removing only the water pump). It creates a new metal liner that bonds to the pipe, permanently bypassing the failed rubber seal.
  2. Collapsible Pipe: An aftermarket two piece pipe that requires removing the intake manifold and “valley pan.” The original one piece pipe is cut out, and the collapsible version is expanded into place using new O rings.
  3. OEM Factory Pipe: This is a solid, one-piece pipe. Installing a new one according to factory specs requires a complete front engine teardown.
Key Components to Check
  • Valley Pan Gasket: Located directly above the transfer pipe; it can also leak and pool coolant in the engine valley.
  • Secondary Air Pipes: These often need to be removed or replaced during a full valley teardown as they can become brittle.
  • Water Pump: Since it must be removed to access the pipe for most repairs, it is a recommended “while you’re in there” replacement.

The BimmerFix® Solution

Patented Design

Our high strength aluminum alloy stent creates a permanent metal liner inside the failed seal area. Protected by US Patents 11,112,051 and 10,240,513.

No Engine Removal

The entire installation is performed through the water pump opening. If you can replace a water pump, you can fix this leak in about one extra hour.

Lifetime Warranty

We are the only repair method on the market offering a lifetime warranty for as long as you own the vehicle. Buy with total confidence.

Is Your Vehicle Affected?

Our kits are a direct fit for the following BMW and Rolls-Royce models manufactured between 2002 and 2010 (plus select models up to 2017):

Series Engine Type Models
5 Series N62 V8 545i, 550i (E60/E61)
6 Series N62 V8 645Ci, 650i (E63/E64)
7 Series N62 V8 / N73 V12 745i/Li, 750i/Li, 760i/Li (E65/E66)
X5 SUV N62 V8 4.4i, 4.8i (E53/E70)
Rolls-Royce N73 V12 Phantom 7 (2003-2017)

Frequently Asked Questions

Do I need to remove the intake manifold?

No. Unlike “collapsible” pipe methods, the BimmerFix Stent does not require removing the intake manifold or the valley pan. You only remove the water pump.

What if I’ve already installed a collapsible pipe?

Our stent is compatible with most aftermarket expandable pipes as a secondary reinforcement if they begin to leak at the front seal.

Is the sealant included?

Yes. Every kit comes with our high-temp, high oil resistant BimmerFix sealant capable of withstanding up to 500°C.

 

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