BILSTEIN B8 8100 Bypass Shocks Instruction Manual

BILSTEIN B8 8100 Bypass Shocks

Product Information

• The product is the E4-WM5-Y631A00 B8 8100 shock absorbers, suitable for both the left front (driver) 25-287806 and right front (passenger) 25-287813. The shock absorbers come with a bill of materials (BOM) for the included mounting parts kits.
• It is important to note that the installation of shock absorbers or other suspension components requires special tools and expert knowledge. Therefore, it is recommended that the installation of these BILSTEIN products be performed by a professional automotivesuspension technician.
• When replacing other brands, it is advised to install BILSTEIN shock absorbers or other suspension components as a set. The BILSTEIN products should only be used for the specific intended application as indicated in the application guide. Any misuse or use for unintended purposes may result in serious bodily injury or death.
• During the installation process, it is essential to use a chassis hoist and ensure that the raised vehicle is securely attached to the hoist or supported to prevent slipping, falling, or movement. Failure to use the necessary tools and hoist may pose a risk of serious bodily injury or death.
• Modifying or tampering with any BILSTEIN suspension product, without proper tools and expertise, may void the warranty and can result in serious bodily injury or death.
• For coilover-type suspensions, it is crucial to refer to the vehicle manufacturer’s service manual for proper procedures. The coil spring must be compressed with a spring compressor to release load before disassembling the upper mount. Failure to follow the manufacturer’s procedures may cause serious injury or death and may damage the vehicle.

Product Usage Instructions

1. Refer to the vehicle manufacturer’s service manual for procedures to remove the existing shocks from the vehicle. Inspect the OE upper bolts/washers for wear and damage. If necessary, purchase replacement OE components.
2. Use the provided mount kit to attach the remote reservoir to the vehicle frame rail behind the front bumper. Refer to Figure 1 for the left side shock (25-287806) and Figure 2 for the right side shock (25-287813) for visual guidance.
3. Ensure that the wheels used have a maximum backspacing of 4.5 to maintain clearance between the tire and the shocks during installation.
4. Follow the step-by-step procedure provided in the manual, which includes pictures for both sides of the vehicle. Refer to page 22 for the end result.

This instruction is for both left front (driver) 25-287806 and right front (passenger) 25-287813 B8 8100 shocks. A bill of materials (BOM) of the included mounting parts kits is shown on the next page.

IMPORTANT! READ THIS FIRST

Installation of shock absorbers or other suspension components requires special tools and expert knowledge. Accordingly, installation of all BILSTEIN products must be performed by a professional automotive suspension technician.
When replacing other brands, BILSTEIN shock absorbers or other suspension components should always be installed as a set. All BILSTEIN products must only be used for the specific, intended application as indicated in the application guide. Any use of any BILSTEIN product other than for its intended use may result in serious bodily injury or death.
Always use a chassis hoist for the installation of BILSTEIN products and make certain that the raised vehicle is securely attached to the hoist and/or supported to prevent the vehicle from slipping, falling, or moving during the installation process.
If you install any BILSTEIN product without the necessary special tools, expertise, and chassis hoist, you may subject yourself to the risk of serious bodily injury or death.
BILSTEIN shock absorbers are gas-filled and are highly pressurized.

• Never place any BILSTEIN shock absorbers in a vise or use a clamp on any BILSTEIN shock absorber.
• Never apply heat near any BILSTEIN shock absorber.
• Never attempt to open or repair any BILSTEIN product, in order to prevent serious bodily injury or death.
• Any attempt to misuse, misapply, modify, or tamper with any BILSTEIN suspension product voids any warranty and may result in serious bodily injury or death.

While installing any BILSTEIN product:

• Do not use impact tools for loosening or tightening fasteners, because this may destroy the screw threads.
• Self-locking fasteners must only be used once!
• Reuse original equipment components only if they are in good condition, otherwise replace them with new components.
• Never remove the slight film of oil on the shock absorber piston rod and seal.
• All mounting fasteners for shock absorbers and other suspension components must be securely tightened before tension is placed on the suspension system, unless otherwise specified in the manufacturer’s service manual or in this instruction.

After installing any BILSTEIN product:

• The suspension caster and camber must be checked and/or adjusted to comply with the vehicle manufacturer’s specifications.
• The (load dependent) brake compensator and the anti-lock brake system must be checked and/or reset to comply with the vehicle manufacturer’s specifications.
• The headlight aim must be checked and adjusted.

CAUTION for COILOVER TYPE SUSPENSIONS!!!

If disassembling a coilover type suspension, refer to the vehicle manufacturer’s service manual for proper procedures. The coil spring is preloaded and must be compressed with a spring compressor to release load before the upper mount is disassembled. Failure to follow the vehicle manufacturer’s procedures may cause serious injury or death, and may damage the vehicle.

IMPORTANT!!!

• This BILSTEIN product may or may not be compatible with non-BILSTEIN aftermarket products and/or vehicle modifications. It is the responsibility of the professional automotive suspension technician performing the installation to identify any non-OEM components and/or modifications on the vehicle that may interact with the suspension system. These must be evaluated for any potential physical static or dynamic interference with and/or effect on the function of this BILSTEIN product.

MOUNTING INSTRUCTION

B8 8100 bypass shocks feature a proprietary BILSTEIN zinc plated finish. This finish must be serviced in order to maintain its luster. Particularly in moist climates, a protective coating, such as a wax or lubricating oil should be periodically applied to prevent tarnishing. This finish is not covered under warranty.
It is normal to hear a slight audible clicking noise during compression and rebound strokes in the B8 8100 bypass shocks, most notably during low velocity events. This is due to the internal check pistons opening and closing to create the externally adjustable compression and rebound zones.

B8 8100 bypass shock installation procedure:

B8 8100 bypass shocks are corner specific. The step by step procedure is shown with pictures of both sides. See page 22 for the end result.
Installation of B8 8100 bypass shocks requires the use of wheels with a maximum of 4.5” backspacing to ensure clearance between the tire and the shocks.

• A. Remove the existing shocks from the vehicle following all procedures in the vehicle manufacture’s service manual. Inspect the OE upper bolts/washers for any excessive wear. If damage or excessive wear is present in any of these components, purchase the required replacement OE components.

• B. A mount kit is included to allow the remote reservoir to be attached to the vehicle frame rail behind the front bumper. This kit is depicted in Figure 1 for the left side shock (25-287806) and Figure 2 for the right side shock (25-287813).

• C. If you have access to a threaded insert gun or pliers, that may be preferable to set the provided threaded inserts (BOM item #6 & #7). Otherwise, using the items in Figure 3, and a ½” box end wrench, arrange them as shown and turn the ¼”-20 screw (BOM item #10) by hand until it is snug as shown in Figure 4.
  Note that the screw will pass through the serrated flange nut without engaging the threads. The serrations on the flange nut prevent the threaded insert from rotating while setting it.

• For the left side, insert the threaded insert (BOM item #6) into the hole shown in Figure 5. For the right side, insert the threaded insert (BOM item #6) into the hole shown in Figure 6.

• E. While keeping the threaded insert (BOM item #6) flange firm and parallel against the bumper support, tighten the screw (BOM item #10) using a 7/16” box end wrench or socket. Turn it 2 rotations to set the threaded insert. Tightening in ¼ turn increments tends to work well.

• F. Remove and discard the screw (BOM item #10), washer (BOM item #11), and serrated flange nut (BOM item #12). The threaded insert (BOM item #6) should now be rigidly fixed in the hole.

• G. Assemble the 5/16”-18 hex screw (BOM item #13), 5/16” flat washer (BOM item #14), a 9/16” boxed end wrench, the 3/8” serrated flange nut (BOM item #15) and hex threaded insert (BOM item #7) the same way shown in Figure 3.

• H For the left side, insert the hex threaded insert (BOM item #7) into the hole shown in Figure 5. For the right side, insert the hex threaded insert (BOM item #7) into the hole shown in Figure 6.

• I. While keeping the hex threaded insert (BOM item #7) flange firm and parallel against the bumper support, tighten the screw (BOM item #13) using a 1/2” box end wrench or socket. Turn it 2 rotations to set the hex threaded insert (BOM item #7). Tightening in ¼ turn increments tends to work well.

• J. Remove and discard the screw (BOM item #13), washer (BOM item #14), and serrated flange nut (BOM item #15). The hex threaded insert (BOM item #7) should now be rigidly fixed in the hole.

• K. Prepare the reservoir mount assembly by applying non-permanent thread locker to two Flat Head Screws (BOM item #3). Mount the Reservoir Clamp (BOM item #2) to the Bracket Plate (BOM item #1) using the two Flat Head Screws (BOM item #3) as shown in Figures 7 and 8. Tighten the Flat Head Screws (BOM item #3) using a 5mm hex.
  Torque both screws to 16 ft-lb (22 Nm).

• L. Place the Nylock (BOM item #9) in the slot of the Reservoir Clamp (BOM item #2) as shown in Figures 7 and 8. Then insert the Socket Head Cap Screw (BOM item #8) into the hole in the Reservoir Clamp (BOM item #2), threading it into the Nylock (BOM item #9) as shown in Figures 7 and 8. Using a 5mm Hex, Tighten the Socket Head Cap Screw (BOM item #8) only a few turns, leaving it loose enough so the reservoir can be installed a following step of these instructions
  Left Side Reservoir Hose Mount Bracket

• M. Locate the hole in the front side of the left spring bucket shown in figure 9. Using a M8x1.25 Socket Head Cap Screw (BOM item #17), and a M8x1.25 Serrated Flange Nut (BOM item #18), attach the Left Reservoir Hose Mount Bracket (BOM item #16) to the spring bucket and orient as shown in figures 10 and 11.
  Torque the screw to 16 ft-lb (22 Nm).
  Right Side Reservoir Hose Mount Bracket

• N. Locate the hole in the front side of the right spring bucket shown in figure 12. Using a M8x1.25 Button Head Screw (BOM item #20), and a M8x1.25 Serrated Flange Nut (BOM item #18), attach the Right Reservoir Hose Mount Bracket (BOM item #22) to the spring bucket and orient as shown in figures 13 and 14.
  Torque the screw to 16 ft-lb (22 Nm).
  Shock Upper Mount Installation

• O. Install the shock’s upper mount using the OE upper bolts/washers as shown in Figures 15 and 16. Do not tighten at this time
  Shock Lower Mount Installation

• P. A mount kit is included to allow the lower shock mount to be offset away from the frame. This kit is depicted in Figure 17.

• Q. Install the Mount Clevis (BOM item #23) using the M10x1.5 Flat Head Screw (BOM item #26) and M10x1.5 Nut (BOM Item #28) for the left side of the vehicle. For installation on the right side of the vehicle, use the M8x1.25 Flat Head Screw (BOM item #25) and M8x1.25 Nut (BOM item #27).
  Torque the screw to 31 ft-lb (42 Nm).

• R. Place the Spacer (BOM item #24) between the flanges of the OE mount. Position the shock’s lower mount between the outside flange of the OE mount and the clevis. Make sure the shocks lower mount is installed angling the shock toward the back of the vehicle and inward toward the chassis as shown in Figures 18 and 19. Do not tighten at this time.
  Reservoir Mounting

• S. Apply non-permanent thread locker to the 5/16”-18 X 1” Flange Head Cap Screw (BOM item #5) and install the reservoir mount assembly with the screw in the bottom threaded insert. Leave the screw loose for now. Rotate the assembly toward the rear of the vehicle and slide the reservoir into the clamp as shown in Figures 20 through 23.

• T. Rotate the reservoir mount assembly back to vertical. Apply non-permanent thread locker to the 1/4”-20 x 1” Flange Head Cap Screw (BOM item #4) and install it in the upper threaded insert.
  Torque both screws 10 ft-lb (13.6 Nm).

• U. Position the end of the reservoir tube approximately 40mm below the bottom side of the clamp as shown in Figure 24. With the reservoir hose exiting straight toward the back of the vehicle, tighten the Socket Head Cap Screw in the Reservoir Clamp so the reservoir does not move.
  Apply Rubber Protective Strip

• V. To protect the reservoir hose from abrading on the chassis, a rubber strip (BOM item #21) should be applied to the chassis body mount in the locations shown in Figure 25 on the left side of the vehicle and 26 on the right side of the vehicle. To apply the strip on the curved surface, either cut the adhesive backed side of the angled Rubber Strip (BOM item #21) to allow for flexibility around the curve, or cut it in half, and apply to either side of the curve
  Left Side Reservoir Hose Mounting

• W. Spread the Loop Clamp (BOM item #19) enough to wrap it around the left side reservoir hose. Apply non-permanent thread locker to the M8x1.25 Button head Screw (BOM item #20), and secure the Loop Clamp (BOM item #19) to the Left Reservoir Hose Mount Bracket (BOM item #16) as shown in Figures 27 and 28. The Loop Clamp (BOM item #19) should be pointed toward the front of the vehicle.
  Torque the screw to 16 ft-lb (22 Nm).
  Right Side Reservoir Hose Mounting

• X. Spread the Loop Clamp (BOM item #19) enough to wrap it around the right side reservoir hose. Apply non-permanent thread locker to the M8x1.25 Button head Screw (BOM item #20), and using a M8x1.25 Serrated Flange Nut (BOM item #18), secure the Loop Clamp (BOM item #19) to the Reservoir Hose Mount Bracket (BOM item #22) on the right side as shown in Figure 29. The Loop Clamp (BOM item #19) should be pointing toward the outside of the vehicle.
  Torque the screw to 16 ft-lb (22 Nm).

• Y. Loosen the Socket Head Cap Screw in the Reservoir Clamp, and angle the reservoir hose toward the inside of the vehicle. Adjust the reservoir angle so that the reservoir hose is 6mm from the chassis body mount as shown in Figures 30 and 31. Make sure to maintain the 40mm distance between the end of the reservoir tube, and the bottom side of the clamp as shown in Figure 24.
  Torque the Screw to 6 ft-lb (8 Nm).

• Z. With the vehicle back on the ground, tighten the OE upper and supplied lower fasteners to the vehicle manufacture’s service manual torque specifications

• AA. If the inner fender liners had been removed, reinstall them behind the reservoir hose.

• B8 8100 bypass shocks allow the user to tune the damping for the best possible ride quality of their vehicle. The shocks offer multiple zones of compression and rebound damping, depending upon the bypass configuration. The factory setting is:

  • Rebound – 7 full turns out from fully closed
  • Compression – 7 full turns out from fully closed
    Note : The bypass adjusters allow adjustment up to 10 full turns out from fully closed.

B8 8100 bypass adjustment procedure:

1. Using an Allen key, hold the adjuster screw from rotating. Loosen the jam nut from the bypass adjuster housing. Back it off far enough that you can make the adjustment without the jam nut bottoming out.

2. Rotate the Allen key to make the desired adjustment.
   TURN IN (Clockwise) the adjuster screw to INCREASE damping TURN OUT (Counter Clockwise) the adjuster screw to DECREASE damping

3. Tighten the jam nut against the bypass adjuster housing while using the Allen key to hold the adjuster screw from rotating.
   Make sure the bypass adjuster housing does not loosen during the adjustment process. It may be necessary to hold the bypass adjuster housing with the appropriate wrench while loosening the jam nut. B8 8100 bypass service:

For service of your B8 8100 bypass shocks, please contact:

THYSSENKRUPP BILSTEIN OF AMERICA
13225 Danielson St. Poway, CA 92064, USA
Toll Free : 1-800-537-1085
bilsteinus.com
E4-WM5-Y631A00_1 Page 22 of 22

References

• BILSTEIN Corporate - BILSTEIN

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