Brey Krause Engine Carrier Mount. Porsche 911 1964-89  ❭  R-9055

Engine mount Part number 987.375.023.05 (often written 98737502305) is the centre engine mount / mount insulator used on mid-engine Porsche Boxster/Cayman models, commonly fitted to late 986 and 987 Boxster / early 987 Cayman applications. The item is offered both as the complete mount and bracket assembly and as a replacement bushing/insulator that must be pressed into the aluminium bracket.

Position: center engine mount (the central mount that locates the engine fore/aft and resists torque). 

Fits:

• Porsche Boxster 986 2.5L 1997-99
• Porsche Boxster 986 2.7L 1999-02
• Porsche Boxster S 986 3.2L 1999-02
• Porsche Boxster 986 2.7L 2003-04
• Porsche Boxster S 986 3.2L 2003-04
• Porsche Boxster 987 2.7L 2005 -08/08
• Porsche Boxster 987 S 3.2/3.4L 2005-08/08
• Porsche Cayman 2.7L 987C 2006-08
• Porsche Cayman S 3.4L 987C 2005-08  

Replace the part when it has lost its ability to control engine movement and damp vibration. Typical triggers to replace the centre mount include: 

• Hard clunk or bang on acceleration, deceleration or gear changes (engine shifting against chassis).
• Excessive vibration into the cabin, especially at idle or specific RPM bands.
• Visible damage — torn, separated rubber, oil-soaked or collapsed mount/bushing, or corrosion of mating faces. 

Common issues & failure causes

• Rubber deterioration: age, heat cycling and mechanical fatigue cause the rubber to harden, crack or de-bond from the metal, reducing isolation and allowing increased engine movement.
• Fluid contamination: oil or coolant leaks accelerate rubber breakdown (softening or swelling), commonly seen on older engines where leaks occur.
• Mechanical shock / abuse: repeated hard launches, aggressive shifting or collisions can cause sudden mount failure or promote early fatigue.
• Bracket wear / corrosion: the bushing may be fine, but the aluminium bracket can crack, corrode, or the bushing may need pressing into a worn bracket — which is why some techs prefer replacing the full assembly. 

This product supersedes Porsche's old part numbers:
- 98737502304

Click 'Zoom in' for large parts diagram.
Diagram Ref No 2.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

98737502305

The product you are viewing cross references to these numbers

Engine Mount Stop.


Fits:
Porsche 987 Boxster / S 2005-08
Porsche 987 Boxster / S 2009-12
Porsche 987C Cayman / S 2005-08
Porsche 987C Cayman / S 2009-12

This product supersedes Porsche's old part numbers:
- 98737525503
- 98737525505

Price is for each.

Click 'Zoom in' for large parts diagram.
Diagram Ref No 3

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9A137525701

The product you are viewing cross references to these numbers

Engine Suspension Bracket.

 
Fits:
Porsche 987 Boxster / S 2009-12
Porsche 987C Cayman / S 2009-12

Diagram ref no 2

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9A137502322

The product you are viewing cross references to these numbers