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Porsche Cayman 987C / 981C (2005-2016) Cayman S / R 3.4L 987C MKII 2009-12 Engine Rebuild Parts Engine Bolts / Studs

Through bolt o-ring installer with sleeve for Porsche 911  ›  SR024

Through bolt o-ring installer with sleeve for Porsche 911 - SR024
3
Check vehicle fitment
SR024
Product Information
Product Information
Stomski Racing SR024 Through bolt o-ring installer with sleeve for Porsche 911

Based on the factory P9511 tool, STOMSKI RACING's version of this tool incorporates a brass cap and a double-ended stainless steel sleeve to install the o-rings on the crankcase through-bolts of the 3.6 and later cases (but possibly can be used on some other 911 engines). By using the included brass cap to protect the delicate o-ring from getting cut on the threads of the bolt, you then use the "thin" end of the sleeve to slide the o-ring over the brass cap onto the shank of the through-bolt. Once the o-ring is clear of the threads, remove the SR024 brass cap and flip the SR024 stainless steel sleeve over and use the blunted end to securely and gently seat the o-ring in the recess on the 3.6 case.
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HEX HEAD BOLT M12X1,5X110MM (extra long) - 91137504300, 90008214201
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HEX HEAD BOLT M12X1,5X110MM (extra long)
90008214201L
Product Information
Product Information
HEX HEAD BOLT M12X1,5X110MM (extra long)

This Item is an Original Porsche Part found by using our original Porsche Part Number Search. If you are ordering parts via this method it is your responsibility to make sure that you enter and purchase the correct products for your vehicle. Please only use the searched product if you are sure of the part numbers as parts cannot be returned if ordered incorrectly.

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90008214201L
91137504300
90008214201

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Titanium exhaust head stud kit. Porsche 996TT/ 997TT/ GT3 / GT2 - 90037813100, 90037822709, 99907507400, 90037822701, 99907353501, 99907507400, 99907353501, 99907507400
1
Titanium exhaust head stud kit. Porsche 996TT/ 997TT/ GT3 / GT2
SL-TI-18
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High performance stud + nut kits for the exhaust manifold to cylinder head for Porsche. Using titanium and Inconel alloy studs, aerospace lock nuts, and a well-thought and balanced combination of metals and plating/coatings, our fasteners will perform better than the traditional fastener. They will never oxidize, and hence will unscrew easily when required.

Novel ultra-high-performance product
• Use of Titanium Ti6Al4V technology
• Extreme perceived quality

Contains 18 x Studs, Nuts & Washers

Fits:
Porsche 996 Turbo / GT3 / GT2
Porsche 997 Turbo / GT3 / GT2
Porsche 997.2 ALL
Porsche 991 ALL
Porsche 992 ALL
Porsche 987 2009-12
Porsche 981
Porsche 718 GT4

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

SL-TI-18
90037813100
90037822709
99907507400
90037822701
99907353501
99907507400
99907353501
99907507400

The product you are viewing cross references to these numbers
Exhaust head stud kit in Titanium. Porsche 996TT/ 997TT/ GT3 / GT2 - 90037813100, 90037822709, 99907507400, 90037822701, 99907353501, 99907507400, 99907353501, 99907507400
2
Exhaust head stud kit in Titanium. Porsche 996TT/ 997TT/ GT3 / GT2
TITANSTUDS18
Product Information
Product Information
These titanium components are resistant to rust and corrosion, which can be a common issue with traditional steel studs and nuts. This corrosion resistance ensures that the studs and nuts maintain their integrity, allowing for easy removal and installation when necessary. They are the perfect upgrade for Porsche enthusiasts who demand the ease of access to vehicle's exhaust system. 

• Ultra-high-performance product
• Use of Titanium Ti6Al4V technology

Contains 18 x Studs (38mm), Nuts & Washers

Fits:
Porsche 996 Turbo / GT3 / GT2
Porsche 997 Turbo / GT3 / GT2
Porsche 997.2 ALL
Porsche 991 ALL
Porsche 992 ALL
Porsche 987 2009-12
Porsche 981
Porsche 718 GT4

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

TITANSTUDS18
90037813100
90037822709
99907507400
90037822701
99907353501
99907507400
99907353501
99907507400

The product you are viewing cross references to these numbers
Torx Screw Cylinder Head M12 x 1.5 x 140 - 9A700863300, 9A110419100
2
Torx Screw Cylinder Head M12 x 1.5 x 140
Special Order item
9A700863300
Product Information
Product Information

Torx Screw Cylinder Head - M12 x 1.5 x 140
Sold each - 4 required per car

The Cylinder Head Torx Screw is a replacement engine fastening component designed to secure the cylinder head assembly on compatible Porsche engines.

Fits:

  • Porsche Boxster 987 MKII 2.9L 2009-12
  • Porsche Boxster S 987 MKII 3.4L 2009-12
  • Porsche Boxster 981 2.7L 2012-16
  • Porsche Boxster 981 S / GTS 3.4L 2012-16
  • Porsche Boxster 981 Spyder 3.8L 2016
  • Porsche Boxster GTS 718 4.0L Manual (400 Bhp) 01/2019>>
  • Porsche Boxster GTS 718 4.0L PDK (400 Bhp) 01/2019>>
  • Porsche Boxster 25 Years 718 4.0L Manual (400 Bhp) 01/2020>>
  • Porsche Boxster 25 Years 718 4.0L PDK (400 Bhp) 01/2020>>
  • Porsche 997 MKII Carrera C2 3.6L 2009-12
  • Porsche 997 MKII Carrera C4 3.6L 2009-12
  • Porsche 997 MKII Carrera C2S 3.8L 2009-12
  • Porsche 997 MKII Carrera C4S 3.8L 2009-12
  • Porsche 997 MKII Turbo 2010-13
  • Porsche 991.1 Carrera C2 3.4L (350 Bhp) 2012-16
  • Porsche 991.1 Carrera C2S / GTS 3.8L (400/430 Bhp) 2012-16
  • Porsche 991.1 Carrera C4 3.4L (350 Bhp) 2012-16
  • Porsche 991.1 Carrera C4S / GTS 3.8L (400/430 Bhp) 2012-16
  • Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
  • Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
  • Porsche 991.1 R 4.0L (500 Bhp) 2016
  • Porsche 991.1 GT3 3.8L (475 Bhp) 2014-16
  • Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16
  • Porsche 991.2 Carrera 2 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Carrera 2S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Carrera 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Carrera 4S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 2 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 2S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 4S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Targa 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Targa 4S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
  • Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
  • Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
  • Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
  • Porsche 991.2 Speedster 4.0L (510Bhp) 2019
  • Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
  • Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
  • Porsche 991 GT3 Cup 2018-2019
  • Porsche 992.1 Carrera 2 3.0L 2019-24
  • Porsche 992.1 Carrera 4 3.0L 2019-24
  • Porsche 992.1 Carrera 2 Cabriolet 3.0L 2019-24
  • Porsche 992.1 Carrera 4 Cabriolet 3.0L 2019-24
  • Porsche 992.1 Carrera 2S / GTS 3.0L 2019-24
  • Porsche 992.1 Carrera 4S / GTS 3.0L 2019-24
  • Porsche 992.1 Carrera 2S / GTS Cabriolet 3.0L 2019-24
  • Porsche 992.1 Carrera 4S / GTS Cabriolet 3.0L 2019-24
  • Porsche 992.1 Targa 4 3.0L 2020-24
  • Porsche 992.1 Targa 4S / GTS 3.0L 2020-24
  • Porsche 992.1 Speedster 4.0L 2019-24
  • Porsche 992.1 Turbo 3.8L 2020-24
  • Porsche 992.1 Turbo S 3.8L 2020-24
  • Porsche 992.1 Turbo Cabriolet 3.8L 2020-24
  • Porsche 992.1 Turbo S Cabriolet 3.8L 2020-24
  • Porsche 992.1 GT3 4.0L / 992 S/T 4.0L 2021-24
  • Porsche 992.1 GT3 RS 4.0L 2022-24
  • Porsche 992.1 (911) Sport Classic 3.8L 2023
  • Porsche 992.1 (911) Dakar 3.0L 2023-24
  • Porsche 992.2 Carrera 2 3.0L 2024>>
  • Porsche 992.2 Carrera 2S 3.0L 2024>>
  • Porsche 992.2 Carrera T 3.0L 2024>>
  • Porsche 992.2 Carrera 4S 3.0L 2024>>
  • Porsche 992.2 Carrera 2 GTS / Spirit 70 3.6L 2024>>
  • Porsche 992.2 Carrera 4 GTS 3.6L 2024>>
  • Porsche 992.2 Turbo S 3.6L 2024>>
  • Porsche 992.2 GT3 / Touring / S/C 2025>>
  • Porsche Cayman 2.9L 987C MKII 2009-12
  • Porsche Cayman S / R 3.4L 987C MKII 2009-12
  • Porsche Cayman 2.7L 981 2013-16
  • Porsche Cayman S / GTS 3.4L 981 2013-16
  • Porsche Cayman GT4 3.8L 2015-16
  • Porsche Cayman GTS 718 4.0L Manual (400 Bhp)
  • Porsche Cayman GTS 718 4.0L PDK (400 Bhp)
  • Porsche Cayman GT4 Clubsport
  • Porsche Cayman GT4 RS Clubsport 2020-2024

Diagram Ref No 16

What Does It Do?

The cylinder head screw secures the cylinder head to the engine, maintaining the correct clamping pressure needed for reliable combustion chamber sealing.

Why Does It Fail?

Common causes include:

  • Excessive tightening or overstretching
  • Repeated engine overheating
  • Corrosion or thread damage
  • Incorrect installation procedures
  • Reuse of bolts designed for single use

When Should It Be Replaced?

Replace whenever specified by the Porsche workshop procedure, particularly during cylinder head removal or engine rebuilding.

Damaged, stretched or corroded screws must not be reused.

Checks & Installation

Inspect the cylinder head, threaded mounting holes and gasket surfaces before installation.

Follow the correct Porsche tightening sequence, torque settings and angle-tightening procedure where specified.

Confirm whether the original screws are single-use fasteners before reassembly.

Key Features

  • Replacement cylinder head Torx screw
  • M12 x 1.5 thread 140 mm length
  • Helps maintain correct cylinder head clamping
  • Suitable for engine servicing and rebuilding
  • Sold individually – 4 required per car

Porsche Cylinder Head Bolts & Engine Fastening Components

Cylinder head screws are essential engine fasteners that maintain the secure connection between the cylinder head and engine assembly.

Correct installation and tightening are critical for maintaining combustion sealing and preventing damage to engine components.



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

9A700863300
9A700863300
9A110419100

The product you are viewing cross references to these numbers