Your Cart is Empty


Free Shipping


Fluidampr 870201

Fluidampr 870201 6.0L Powerstroke Harmonic Fluid Damper

Fluidampr 870201 6.0L Powerstroke Fluidampr Harmonic Fluid Damper



 Fluidampr 870201 6.0L Powerstroke Fluidampr Powerstroke Replacement Harmonic Fluid Damper. This American Made viscous crankshaft damper is designed for use on the Ford 6.0L Powerstroke diesel engines with a single alternator.

The Fluidampr 870201 High Performance Diesel Damper applications:

  • 2003 to 2007 Ford 6.0L Powerstroke motor used in F-250 Super Duty trucks.
  • 2003 to 2007 Ford 6.0L Powerstroke motor used in F-350 Super Duty trucks.
  • 2003 to 2006 Ford 6.0L Powerstroke motor used in the Excursion trucks.
  • 2003 to 2009 Ford 6.0L Powerstroke engine in the E-Series Vans.

By installing a Fluidampr 870201 viscous damper on your Ford 6.0L Powerstroke, you will:

  • Reduce wear on the main bearings and timing gear
  • Achieve more accurate valve train operation
  • Lower the risk of crank failure.
  • Increase the power output of the motor.

Specifications of the Ford 6.0L Powerstroke Fluidampr Performance Diesel Series Damper

  • Material = Steel
  • Coated in a Black Zinc Finish
  • Outside Diameter is 8-7/8."
  • Unit Weighs 21.9 pounds.
  • Balance = External

The Fluidampr 870201 6.0L Powerstroke Harmonic Fluid Damper benefits:

  • This Viscous Damper never needs to be tuned or rebuilt.
  • Will protect your engine from destructive torsional vibrations.
  • Only a Viscous Crankshaft Damper Increases both the TORQUE & HORSEPOWER output of your 6.0L Powerstroke.
  • Viscous Damper promotes longer engine life.
  • 100% Made In the USA!

High performance diesel engines running chips and programmers are exceptionally vulnerable to torsional vibrations. Save your crank & more by installing a new Fluidampr 870201 Harmonic Damper today on your 6.0L Ford Powerstroke. Each time the air/fuel mixture inside a cylinder is ignited, the combustion that occurs creates a torque spike that is applied to the crankshaft through the piston and rod. This torque spike is so severe that it not only turns the crankshaft, it twists the crankshaft ahead of its regular rotation, and then the crankshaft rebounds. This twisting action is known as torsional vibration. When these torque spikes and forces get into phase with the natural frequency, critical torsional harmonic vibrations occur and can be severely destructive to the bearings and the crankshaft.

Fluidampr870211 Harmonic Dampers are designed to control those destructive vibrations in the 6.0L Powerstroke diesel engine at all engine speeds and power output levels.

NOTE: This Ford Powerstroke Fluidampr Harmonic Balancer is for 2003 to 2009 Ford 6.0L Powerstroke with a Single Alternator.


  • Engine: 6.0L Powerstroke
  • Power Level: Stock to Highly Modified diesel engines
  • Item Number: Fluidampr 870201
  • Make: Ford
  • Model: E-Series | Excursion | F250 | F350
  • Year: 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009
  • Manufacturer Part No: 870201
  • Product Application: 2003 to 2009 Ford 6.0L Powerstroke Diesel Engines
  • Height: 8
  • Width: 16
  • Brand: Fluidampr
  • FAQDo I really need to change the crankshaft damper on my 6.0L Powerstroke diesel engine?  The harmonic damper is considered a wear item and needs to be replaced over time. If you have changed the power level of your 6.0L diesel engine we strongly recommend the installation of a Fluidampr performance diesel damper on your engine as the OEM damper was designed for stock power levels only. Why should I purchase a fluidampr viscous damper for my engine? The Viscous Performance Diesel Damper for 6.0L Powerstroke Diesel Engine provides control of the destructive torsional vibration on a stock or modified engine. The torsional vibrations present a higher risk for damage, so a viscous damper is an absolute must on these motors. Only a Fluidamper viscous damper protects the engine from destructive crankshaft torsional vibration.
  • Part Number870201
  • Manufacturer: Fluidampr 

The Original Fluidampr Performance Diesel Installation

Step 1 – Tools & Procedures

• Proper key if required

• Anti-seize compound

• Removal & installation tool if required (Damage from improper installation will void your warranty)

• Do not use hammers/pry bars or heat to install or remove Fluidampr. (This will void your warranty and may cause engine damage)

• Honing or machining Fluidampr bore is not recommended (on applicable applications). A diametrical press fit (on press fit only dampers) of .0005” - .0015” is recommended for proper damper function. Using a micrometer, make sure to measure the crank snout and inner bore of Fluidampr to assure a proper fit.

• Sufficient torque wrench (see torque specs on page 2), fan removal tools, flywheel holding tool (if required).

CAUTION: For high horsepower applications we recommend the following:

Engine Engine Power/RPM Recommended Kit Part #

Cummins 5.9L 6.7L 3500+ RPM Fluidampr Drill Pin Kit 300002

Cummins 5.9L 6.7L Above 700HP/1250 ft⋅lb Fluidampr Full Power Kit 300008

Fluidampr Drill Pin Kit 300002

Cummins 5.9L 6.7L Under 700HP/1250 ft⋅lb Fluidampr High Strength

Bolt Kit 300007

1989-2002 Cummins Under 700HP/1250 ft⋅lb Fluidampr High Strength

5.9L Fluidampr w/.350” Bolt Kit 300009

Flange Thickness*

Duramax 6.6L 500 HP & Above Fluidamper High Strength

Bolt Kit 300010

Fluidampr recommends 750+ HP applications to recheck bolt torque after every run/pull

*If you need assistance determining which flange type you have, please contact Fluidampr tech Support.

Step 2 – Balancing - Internally and Externally Balanced Engines


Fluidampr counterweights for external balanced engines have been designed to OEM specifications. If the damper being replaced has never been altered, Fluidampr can be installed with no additional balancing. (see page 2 for whether your Fluidampr is internally or externally balanced)


o Each Fluidampr component is precision balanced during manufacturing. NO additional balancing is required.

o DO NOT ATTEMPT TO BALANCE THE CRANKSHAFT WITH FLUIDAMPR INSTALLED. The inertia ring inside a Fluidampr is balanced to a close tolerance at the factory. It rotates inside the damper.

o DO NOT DRILL FLUIDAMPR – The inertia ring and silicone fluid are in a hermetically sealed housing. Drilling may cause the damper to leak and lead to damper failure, voiding the warranty.

o If balancing the crankshaft is required, install the stock damper while balancing.

Step 3 – Removal

• Remove fan and shroud as per manufacturer’s instructions, draw sketch of belt routing if required and remove the accessory drive belt.

• Dodge Cummins 5.9L (1992 to 1998). BEFORE REMOVING THE STOCK DAMPER, rotate the engine so that the magnetic pick up is not on one of the notches in the outside diameter of the stock damper. If you do not have access to the gap spec, use a feeler gage to measure and record the gap between the magnetic pick up and the stock damper.

• Remove the stock damper per factory/service manual instructions.

Step 4 – Fluidampr Installation

o On engines that the damper slides or presses onto the crankshaft, carefully remove burrs, scratches, or nicks on the crank snout by filing or polishing the snout so that it is smooth and free of surface irregularities. Remove any sharp keyway corners. The key should fit snugly in the keyway on the crank. A heavy press fit creates high stress on the slot and should be avoided. Replace or modify the key if it is too tight or too loose. For bolt-on dampers, clean crankshaft threads, crankshaft mating surface and center pilot thoroughly before installation.

o Cummins installation notes:

• Fluidampr P/N 920301 includes tone wheel. Remove OEM tone wheel prior to Fluidampr installation.

• Fluidampr P/N 920301/920321/980301 – Install damper w/ the smaller of the (2) pin holes on the crankshaft pin. Check crankshaft thread depth to ensure proper bolt length prior to installation.

• Thread bolts into crankshaft fully with washer installed. Space between washer and crankshaft should be less than 0.495” (Fluidampr flange thickness with integrated tone wheel). If the length is over 0.495”, contact Fluidampr Tech Service. Minimum thread engagement = .750”

o Coat crankshaft snout and damper bore with anti-seize compound or moly grease to prevent galling during installation.

o Fluidampr P/N 760131 comes with a hardened crankshaft washer with clearance for the GM 3.200” bolt circle pattern, this replaces the factory crankshaft bolt washer.

o For Ford Power Stroke 6.0L: The belt must be routed between the Fluidampr and the water pump pulley before the Fluidampr is installed.

o Install the Fluidampr and torque the bolt or bolts properly as per the original manufacturers’ torque or torque to yield requirements. Consult a dealer to determine if your application is torque to yield, see below chart for torque specs.

o Fluidampr recommends that crank bolt(s) always be replaced with new OEM or Fluidampr bolt kits.

o Install the accessory drive belt, fan and shroud as per manufacturer’s instructions. Re-torque crankshaft bolt(s) after engine warm-up cycle.

Part# Balance Engine Fitment Years OEM Bolt Torque*

720211 External Ford 7.3L 1999 – 2003 212 Ft-Lbs.

720221 External Ford 7.3L 1994 – 1997 212 Ft-Lbs.

(See #4NFJ for fan spacer installation instructions)

870201 External Ford 6.0L 2003 – 2007 50 Ft-Lbs. plus an additional 90 degrees*

870211 External Ford 6.0L 2003 – 2007 50 Ft-Lbs. plus an additional 90 degrees*

800211 External Ford 6.4L 2008 – 2010 50 Ft-Lbs. plus an additional 90 degrees*

800221 External Ford 6.7L 2011 – Present 22 Ft-Lbs. plus an additional 90 degrees*

800141 External GM Hummer 6.2L/6.5L 1994 – 2000 See Owner’s Manual

800191 External GM 6.2L/6.5L 1982 – 1993 See Owner’s Manual (Must use included spacer)

830111 External Duramax 6.6L LBZ/LMM 2006 – 2010 74 Ft-Lbs. plus an additional 105 degrees*

830121 External Duramax 6.6L LML/LGH 2010.5 – 2016 74 Ft-Lbs. plus an additional 90 degrees*

890101 External Duramax 6.6L LLY/LB7 2001 – 2005 74 Ft-Lbs. plus an additional 105 degrees*

760131 Internal Duramax 6.6L 2001 – Present 74 Ft-Lbs. plus an additional 105 degrees*(P/N 760131 is a press fit onto the internally balanced crankshaft, comes w/ 2 keyways 5mm & 1/4")

920301 Internal Dodge Cummins 5.9L 2003 – 2009 92 Ft-Lbs.

920321 Internal Dodge Cummins 6.7L 2007.5 – Present 92 Ft-Lbs.

960301 Internal Dodge Cummins 5.9L 1998.5 – 2002 92 Ft-Lbs.

960311 Internal Dodge Cummins 5.9L 1989 – 1998 92 Ft-Lbs.

(See #4NFH for sensor relocation kit installation instructions)

960341 Internal Dodge Cummins 5.9L/6.7L Competition Series 92 Ft-Lbs.

980301 Internal Dodge Cummins 5.9L/6.7L Competition Series 92 Ft-Lbs.


Join our list, get first dibs.