BimmerFix Coolant Transfer Pipe Repair System

The BimmerFix Coolant Transfer Pipe Repair System is designed for use on the BMW V-8 N62 engine.  Select the VEHICLES page, for a list of compatible BMW cars and SUVs.  The System is designed as an inexpensive repair method to fix leaking Front Coolant Transfer Pipe Seals, but also included with the BimmerFix Repair System is the BimmerFix Cooling System Sealer & Conditioner, which is added to the coolant as part of the repair, and is designed to seal additional internal coolant leaks in the N62 engine, such as from the Coolant Transfer Pipe O-ring, Engine Valley Pan.  In addition, the BimmerFix Cooling System Sealer & Conditioner also addresses coolant leaks in the rear engine coolant passage covers, which can only be accessed by removing the transmission and exhaust system.

The Bimmerfix Coolant Pipe Repair System can save thousands of dollars in shop labor, parts and supplies.  It also saves on “down-time”, so the car can be drivable in the shortest time possible.  This repair can be performed by a middle-level mechanic, and is much simpler and faster than removing the intake manifold and/or the timing chain covers on a complex V-8 BMW engine, as required with other methods.

Draining Coolant (BMW N62)

Warning:  Danger of scalding! Only carry out work on the coolant system after the engine has cooled down!

Recycling: Catch and dispose of drained coolant.  Observe country-specific waste-disposal regulations.

Follow instructions for working on cooling system.  Use only recommended coolant.

Remove Expansion Tank Cap

Step 1.     Remove Expansion Tank Cap (1) from the Coolant Expansion Tank when the engine is cool to avoid burns. 

Step 1 Remove Expansion Tank Cap


Open Radiator Drain Valve.

Step 2.     Remove front splash guard (if equipped) to access the Radiator Drain Valve (1).

Step 3.     Open the Radiator Drain Valve (1), located at the bottom of the radiator on the right hand side.  Have a container ready to catch the coolant when you open the Radiator Drain Valve. 

Step 4.       Drain, catch and recycle coolant from radiator . 

DANGER; Keep antifreeze away from children and pets!!!

Step 5.       Raise the front of the vehicle approximately 4 inches to insure that any remaining coolant in the engine will drain to the back side of the engine block, and will not interfere with the repair process.   Use a with a floor jack and jack stands.  The wheels of the vehicle do not need to leave the ground.  Check the owners manual for approved lifting places, and proper lifting procedure.  Apply emergency brake, put transmission in “Park”, and have tires properly blocked.

Step 2 Open Radiator Valve


Remove the Engine Cover, Air Intake Duct & Fan Cover  

Step 6.    Remove Fan Cover. 

Step 7.    Remove Engine Cover

Step 8.    Remove Fresh Air Intake Duct between Air Filter Box and intake manifold. 

Note; Do not lean or rest hands upon the Inner Fan Shroud!!! These instructions do not include the removal of the Inner Fan Shroud, located underneath the Fan Cover in this photo. It is not necessary to remove the Inner Fan Shroud in order to complete this repair.  However, it should be noted that this Inner Fan Shroud is very brittle, and can break very easily.  Take care not to rest your hands on the Inner Fan Shroud or it will break!!!



Step 3 Remove the Engine Cover, Air Intake Duct & Fan cover


Step 9.     Remove the Fan Clutch

Caution: The Fan Clutch Has Left-hand threads!!!   


Step 4 Remove the Fan Clutch


Step 10.    Remove The Drive Belt (BMW N62)

Note: If the drive belt is to be subsequently reused: Mark direction of travel and reinstall drive belt in same direction of travel.

Pretension belt tensioner slowly and carefully with a Torx socket. Remove Main Drive Belt.

Step 5 Remove The Drive Belt

 PHOTO # 6

Step 11.   Remove the Sensor Plug Connections & Water Pump Pulley. 

Remove vacuum hoses, coolant hoses, and sensor attachments as needed to access the Water Pump Unlock and detach plug connections (1).

Unlock and detach all coolant hoses on water pump.

Release screws and remove belt pulley (2).

Step 6 Remove Sensor Plug, Water Pump, Vacuum Hose, Coolant Hose


Step 12.   Remove Air Conditioner Compressor belt by releasing tension on the lower fan belt tensioner using a Torx wrench.

Step 13.   Remove lower Crank Case Pulley in order to gain access to all the Water Pump bolts. Note that only the eight Torx bolts attaching the Crank Case Pulley need to removed.  The large bolt in the center of the lower Crank Case Pulley will stay in place, and does not need to be loosened or removed.

Step 7 Remove AC Compressor


Step 14.   Remove the Water Pump

Release Water Pump bolts and remove Water Pump (1).


Step 8 Remove the Water Pump



The Water Pump has been removed      


Step 9 Water Pump has Been Removed



Step 15.    Use your Index finger to inspect the Coolant Transfer Pipe for obstructions caused by the faulty Front Seal. 

Step 10 Use Index Finger to Inspect Coolant Transfer Pipe



Step 16.   Use a knife to cut-out and remove any obstructions caused by original the 

Coolant Transfer Pipe Seal.

 Remove any pieces of the old Seal that may be loose in the Coolant Transfer Pipe after the cutting.  However, you should leave as much of the original seal as possible.  Do not remove the entire old seal!

Step 11 Use A Knife to Cut-Out and Remove Any Obstructions

PHOTO # 12


Step 17.   It may be necessary to sand down a small metal bump located on the Timing Chain Cover, called a “casting mark”, in order to insure the new BimmerFix Stint fits into place without any obstructions.  Some Timing Chain Covers will need more sanding that others, depending on the size of your particular “casting mark”.            

Step 12

PHOTO # 13


Step 18.   Use the Sanding Rod to sand down “casting mark” and also sand the inside of the Coolant Transfer Pipe.  The surfaces should be “roughed-up” and clean of any coolant residue to insure proper bonding of the Stent and Sealant to the Coolant Transfer Pipe and the Timing Chain Cover.   It is a good idea to elevate the front of the vehicle slightly, so that any residual coolant in the Coolant Transfer Pipe, will drain to the back of the engine block, and therefore will not interfere with the sealing process.   If you have a large casting mark bump, then a small electric grinder, such as a drill or a Dermal tool, may be used to speed-up the sanding process. 

Step 13 Use The Sanding Rod



Step 19.   Clean the inside surfaces of the timing chain cover and Coolant Transfer Pipe in preparation for applying the Sealant.  A shop vacuum may be used to remove any loose material and antifreeze that may be in the Coolant Transfer Pipe.  The Cleaning Rod may be sprayed with brake parts cleaner to insure that the inside of the Timing Chain Cover and the Coolant Transfer Pipe are as clean and dry as possible before applying the BimmerFix Coolant Pipe Sealant. 

Step 14 Clean The Inside Surfaces



Step 20.  “Dry-Fit” the Stent into the Timing Chain Cover and Coolant Transfer Pipe.  The purpose of “Dry-Fitting” the Stent, is to insure that the Stent slides into place without any obstructions, before the Sealant is applied to the outside of the Stent.

Step 15 Dry-Fit the stent into the timing chain cover and coolant transfer pipe.


The Stent should be able to slide in and out freely. DO NOT FORCE THE STENT.

If there is resistance, then additional cutting of the Front Seal in Photo 11, or sanding of the “casting mark” in Photo 12 may need to be repeated until the Stent can fit in place and slide in-and-out, without becoming bound-up. 


Step 16 The Stent should be Able To Slide In And Out Freely



The Stent should be placed as shown.  See the photo below.

Step 17 The Stent Should Be Placed As Shown



The Stent should be placed 1  1/4 inch inside of the flat water pump mounting surface as in Photo 18.  Remove the Stent from the Timing Chain Cover before applying the Sealant.

Step 18 the Stent Should Be Placed 1 1/4 inch Inside Of The Flat Water Pump Mounting Surface



Put on the rubber gloves, and get the Stent and tube of Cooling Pipe Sealant ready.

Step 19 Put on Gloves and Get The Stant And Cooling Pipe Sealant



Remove the Stent from the Timing Chain Cover.  Squeeze Sealant onto index finger as shown.

Step 20 Remove the Stent from the Timing Chain Cover. Squeeze Sealant onto index finger as shown.



Step 21.   Use your Index finger to Force Sealant into any gaps and crevices around the internal Rubber Front Seal of the Coolant Transfer Pipe.  Parts of the Rubber Front Seal may have been cut away in Photo #10.  Also apply Sealant to the inner walls on the of the Timing Chain Cover and Coolant Transfer Pipe so that the sealant is sticking to the inner walls.

Use Index Finger to Force Sealant Into any Gaps And Crevices Around the Seal.



Step 22.   Coat Stent with Sealant as shown.

Apply BimmerFix Coolant Pipe Sealant to a sponge brush and liberally coat the inside passage of the Timing Chain Cover and Coolant Transfer Pipe, but do not insert the brush past the “RED” mark on the handle.


Step 22 Coat Stent with Sealant



Step 23.    Do not insert the brush into the Timing Chain Cover and Coolant Pipe past the “RED” mark on the brush handle, as shown in this photo.

Step 23 Do Not Insert the Brush into the Timing Chain Cover

PHOTO #24 a & b


Coat the Stent with Sealant.  The photo to the right shows the Stent completely coated with Sealant on the outside.

Step 24a, Coat Stent with Sealant
Step 24b, Photo Shows Stent Completely coated With Sealant on the Outside

PHOTO #25 a & b

Step 24.   Insert the Stent into the Timing Chain Cover and Coolant Transfer Pipe.  Rotate and turn the Stent slowly in a clockwise direction.   Stop at the 1-1/4 inch mark as shown in Photo #18.

Step 25a, Insert Stent into the Timing Chain Cover and Coolant Transfer Pipe
Step 25b, Insert The Stent Into The Timing Chain Cover and Coolant Transfer Pipe.


Use a smart phone to photograph the inside of the Coolant Transfer Pipe.  Be sure to look very closely for possible obstructions of the Pipe caused by excess Sealant!

Step 26 Take Picture of The Inside of The Coolant Transfer Pipe.



Here is a photo of blockage of the Coolant Pipe caused by excess Sealant!  It is very important that any blockage be removed or it can lead to overheating and engine damage!

Step 27 Remove Any Blockage



This photo is an example of a blockage that has been cut-out of the Coolant Transfer Pipe.  It is important to make sure that any blockage is removed from the Coolant Transfer Pipe because it could cause overheating of the engine and result in engine damage! 

Step 28 Photo Example of Blockage



Use a clean sponge brush to remove any excess Sealant immediately after installing the Stent in order to make sure that any blockage has been removed.  Insert the sponge brush all the way up to the “BLACK” mark on the handle of the brush during the cleaning process.


Take additional photos of the Stent and inside of the Cooling Transfer Pipe and continue to clean the Pipe until it is totally free of any possible blockage.  

Once the Stent is free of any possible blockage, allow the Stent and Sealant to dry for 24-hours before re-assembly and adding antifreeze. 

Step 30 Take Additional Photos of the Stent and Inside of the Cooling Transfer Pipe


It is NOT NESSESARY to add the BimmerFix Cooling System Sealer and Conditioner, in order to stop the coolant leak from the Timing Chain Cover.  Please read the FAQ’s page on our website.   During the re-assembly possess, you can add the BimmerFix Cooling System Sealer & Conditioner directly into the Upper Radiator Hose before attaching the Hose to the Upper Radiator outlet.  
Do not add the Cooling System Sealer & Conditioner directly to the Coolant Expansion Tank because it may clog one of the smaller coolant tubes attached to the Expansion Tank, if not fully mixed with the antifreeze.  This could result in overheating and possible engine damage.
It is necessary to drive the vehicle for 200 miles after re-assembly, for the BimmerFix Cooling System Sealer & Conditioner to fully condition and seal the any other possible additional leaks with the engine block!  It is not nessasary to remove the Cooling System Sealer after 200 miles.
Step 31 BrimmerFix Cooling System Sealer & O-Ring Conditioner


Fan belt routing diagram

Step 32 Fan Belt Routing Diagram