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- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Porsche 928 Flexplate Clamp Upgrade - Permanent Solution to the 928 Flexplate Problem
Protect Your V8 Engine from Catastrophic Failure
The Porsche 928 V8 engine is known for its performance and
engineering excellence, but it also has a well-documented weakness known as the
flexplate problem. If left unaddressed, this issue can lead to severe internal
engine damage and complete engine failure.
Fits:
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Diagram Ref No 25
This upgraded flexplate clamp is engineered as a functional and permanent solution to prevent crankshaft end float movement and protect the axial thrust bearings.
What the Flexplate Problem Is
In the Porsche 928 automatic transmission setup, the flexplate connects the crankshaft to the torque tube driveshaft. If the clamping system fails or loosens, the crankshaft can be forced forward under load.
When this happens:
- The axial crankshaft thrust bearings wear rapidly
- Excessive crankshaft end float develops
- The crankshaft moves forward into the engine block
- The lower block can be permanently damaged
It only takes 3 to 5 mm of forward crank movement for catastrophic damage to occur. Once the crankshaft bores into the block, the engine is effectively written off.
What This Upgraded Flexplate Clamp Does
This redesigned clamp secures the original flexplate clutch sleeve correctly and evenly, preventing forward crankshaft movement.
Unlike other aftermarket solutions, this clamp design focuses purely on mechanical integrity and correct force distribution.
Key design improvements include:
- Three precision-machined circular segments that fit perfectly around the original flexplate sleeve
- Even clamping force across all segments
- Three high-strength M8 12.9 grade socket head bolts
- Torque specification of 60Nm for secure fastening
- Compact, lightweight design to reduce centripetal forces
Why Other Designs Can Fail
Many flexplate clamp designs use two-piece clamping systems around a three-segment shaft. Basic vector force analysis shows that this design cannot distribute compression force evenly across all segments.
Uneven force distribution leads to:
- Inconsistent clamping pressure
- Potential loosening over time
- Continued crankshaft movement risk
Even Porsche’s original clamp used a simpler two-segment design with a single bolt.
This upgraded clamp eliminates uneven load distribution by using a three-part circular design with equalised clamping forces.
Why You Should Upgrade
You should strongly consider installing this flexplate clamp
if:
- You own a Porsche 928 with automatic transmission
- Your engine has never had the flexplate fix performed
- You are rebuilding or restoring a 928 V8
- You want preventative protection against thrust bearing failure
- You are experiencing signs of crankshaft end float
Symptoms of flexplate issues may include:
- Unusual engine noises
- Difficulty maintaining correct crankshaft end play
- Thrust bearing wear during engine rebuild
- Visible crankshaft forward movement
Installing this upgraded clamp holds the driveshaft securely as originally intended and eliminates the flexplate problem completely when correctly fitted.
Engineering Focused on Functionality
This clamp was developed with one goal: to solve the
mechanical weakness permanently.
- Stronger materials than factory design
- Reduced mass to minimise centrifugal stress
- Balanced clamping across all segments
- Designed for durability under high rotational loads
It provides a long-term preventative solution that protects one of the most valuable components of your 928 — the engine block itself.
Key Benefits at a Glance
- Permanent solution to the Porsche 928 flexplate problem
- Prevents crankshaft forward movement
- Protects thrust bearings and engine block
- Even three-point clamping design
- High-strength 12.9 grade bolts
- Lightweight and mechanically balanced
- Designed for long-term engine protection
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
922421255CL
The product you are viewing cross references to these numbers
- Porsche 970.1 Panamera V6 3.6L 2WD 2009-13
- Porsche 970.1 Panamera 4 V6 3.6L 4WD 2009-13
- Porsche 970.1 Panamera S V8 4.8L 2009-13
- Porsche 970.1 Panamera 4S V8 4.8L 2009-13
- Porsche 970.1 Panamera GTS V8 4.8L 2011-13
- Porsche 970.1 Panamera Turbo V8 4.8L 2009-13
- Porsche 970.1 Panamera Turbo S V8 4.8L 2009-13
- Porsche 970.1 Panamera S Hybrid V6 3.0L 2011-13
Fits:
Porsche 970 Panamera / S 2010-14
Porsche 970 Panamera 4 /4S 2010-14
Porsche 970 Panamera GTS 2012-14
Porsche 970 Panamera Hybrid 2012-14
Porsche 970 Panamera Turbo / S 2010-14
The innovative Drive Shaft Clamping Center Support (DSCCS) by EPS is the only true Permanent fix to premature bearing support failures. This Patented device was developed by our team of technicians whom over the course of 2 years were able to create what is now the end-all solution to failing Bearing Supports.
The Clamping Center Support is the ONLY device that can be installed without removing the Drive Shaft from the vehicle or without requiring the disassembly of the Drive Shaft. Why is this so important?
- By not having to disassemble the Drive Shaft means that NO re-balancing of the shaft is required. All other methods of Bearing Support replacement require this expensive and lengthy procedure. Failure to balance the once disassembled Drive Shaft would result in major vibrations.
- Our Clamping Bearing Support installs easily to your Drive Shaft, using basic household tools, in less than an hour. This is a Do-it-Yourself repair that will save you very costly repair bills and unnecessary time down. Should you choose to have a professional install it, the labor times will be much less than Drive Shaft replacement or any other method of repair.
The cause of the premature Drive Shaft Support failure is a direct result of too much continuous stress imposed upon the rubber in the mount. This is more the product of the Drive Shaft design than the quality of the rubber material in the mount. Unfortunately, by merely replacing the Bearing Support with another similar rubber mount you can expect much of the same results experienced with the factory rubber mount.
There is only One certain and definite fix.
The EPS Drive Shaft Clamping Center Support for the Porsche Cayenne, Volkswagen Touareg & Audi Q7 takes a completely different approach in solving this, all too common, problem. Getting away from the proven failure-prone solid rubber vibration dampener, we instead use multiple, hollow Silicone Pods. This design is much better equipped to withstand the constant compressing and stretching forces generated while in use. The silicone material also does a much better job of handling the heat and atmospheric conditions located under your vehicle. Even better, although we have over Two Years of use on our test vehicle and the DSCCS is still functioning flawlessly, in the rare event that any of the Pods on the DSCCS fail, they are very easily replaced in minutes.
Key Benefits :
• Permanently repairs the notorious bearing support
• DIY installation - typically in under one hour using household tools
• No need to remove or disassemble your current Drive Shaft
• No need to re-balance your Drive Shaft
• No need to send in your faulty Drive Shaft
• No core charges
• Lightweight - Spend less on shipping
• Will pay for itself in labor & shipping costs
• Save money & downtime
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
97042103151EPS
The product you are viewing cross references to these numbers
- Porsche 970.1 Panamera V6 3.6L 2WD 2009-13
- Porsche 970.1 Panamera 4 V6 3.6L 4WD 2009-13
- Porsche 970.1 Panamera S V8 4.8L 2009-13
- Porsche 970.1 Panamera 4S V8 4.8L 2009-13
- Porsche 970.1 Panamera GTS V8 4.8L 2011-13
- Porsche 970.2 Panamera V6 3.6L 2WD (310Hp) 2014-16
- Porsche 970.2 Panamera 4 V6 3.6L 4WD (310Hp) 2014-16
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD (420Hp) 2014-16
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD Executive 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD (420Hp) 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD Executive 2014-16
- Porsche 970.2 Panamera GTS V8 4.8L 4WD (440Hp) 2014-16
Fits:
Porsche 970 Panamera S / GTS 4.8L 2009-16 (M48.40)
Porsche 970 Panamera 3.6L 2010-13 (M46.40)
Porsche 970 Panamera 3.6L 2013-16 (339) All-wheel drive
Porsche 970 Panamera S 3.0L 2013-16 (339) All-wheel drive / (0E1) Shorter wheelbase
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
97042101133
The product you are viewing cross references to these numbers
- Porsche 970.1 Panamera V6 3.6L 2WD 2009-13
- Porsche 970.1 Panamera 4 V6 3.6L 4WD 2009-13
- Porsche 970.1 Panamera S V8 4.8L 2009-13
- Porsche 970.1 Panamera 4S V8 4.8L 2009-13
- Porsche 970.1 Panamera GTS V8 4.8L 2011-13
- Porsche 970.2 Panamera V6 3.6L 2WD (310Hp) 2014-16
- Porsche 970.2 Panamera 4 V6 3.6L 4WD (310Hp) 2014-16
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD (420Hp) 2014-16
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD Executive 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD (420Hp) 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD Executive 2014-16
- Porsche 970.2 Panamera GTS V8 4.8L 4WD (440Hp) 2014-16
Fits:
Porsche 970 Panamera S / GTS 4.8L 2009-16 (M48.40)
Porsche 970 Panamera 3.6L 2010-13 (M46.40)
Porsche 970 Panamera 3.6L 2013-16 (339) All-wheel drive
Porsche 970 Panamera S 3.0L 2013-16 (339) All-wheel drive / (0E1) Shorter wheelbase
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
97042101133
The product you are viewing cross references to these numbers