Engine Mounts

Engine mount bush.



Fits:
Porsche 986 Boxster 1997-04
Porsche 987.1 Boxster 2005-08
Porsche 987C.1 Cayman 2006-08

Click 'Zoom in' for large parts diagram.
Fits to no. 2 on the diagram.

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Related, superseded, cross reference or alternative numbers for comparison.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 with HD 95A shore rating bush 



Fits:
Porsche 986 Boxster 1997-04
Porsche 987.1 Boxster 2005-08
Porsche 987C.1 Cayman 2006-08

This product replaces:

98737502304, 98737502305, 98637502307 

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

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Related, superseded, cross reference or alternative numbers for comparison.

3609309871

The product you are viewing cross references to these numbers

Engine mount with HD polyurethane bush



Fits:
Porsche 986 Boxster 1997-04
Porsche 987.1 Boxster 2005-08
Porsche 987C.1 Cayman 2006-08

This product replaces:

98737502304, 98737502305, 98637502307 

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

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Related, superseded, cross reference or alternative numbers for comparison.

3609309872

The product you are viewing cross references to these numbers

Engine mount.



Fits:
Porsche 986 Boxster 1997-04
Porsche 987.1 Boxster 2005-08
Porsche 987C.1 Cayman 2006-08

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Related, superseded, cross reference or alternative numbers for comparison.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

Our polyurethane bushes are ideal replacements for worn or damaged parts. Engine mount bushes are particularly prone to cracking of the rubber because of a large amount of voiding in the material to allow for excessive movement. For an insert only please use PFR57-521BLK.

OEM Part Number: 98737502305
OEM Part Number: 9A137502322

Fits:
Porsche Boxster 986 (1997-2004)
Porsche Boxster 987 (2005-2009)
Porsche Cayman 987C (2005 - 2009)

up to 2009 with engine codes M9625, M9626, M9720, M9721 & M9722

DIAGRAM REFERENCE: 20

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Related, superseded, cross reference or alternative numbers for comparison.

PFR57-520BLK

The product you are viewing cross references to these numbers

Hex head bolt M10x80 for engine mount. 



Fits:
Porsche 986 Boxster - 1997 to 2004
Porsche 987.1 Boxster - 2005 to 2008
Porsche 987.1 Cayman - 2005 to 2008

Click 'Zoom in' for large parts diagram.
Diagram ref no 10

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

99907205501

The product you are viewing cross references to these numbers

Stud M10 x 83 engine and gearbox mounting. 

Fits:
Porsche 996 - 1997 to 2004
Porsche 997.1 -  2005 to 2008
Porsche 997.1 turbo - 2007 to 2008
Porsche 987 Boxster / Cayman - 2005 to 2012

Click 'Zoom in' for large parts diagram.
Diagram ref no 6

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

99906110601

The product you are viewing cross references to these numbers