Extended Tap both Cummins ISX15/QSX15 DOHC & SOHC Series

The Extended Tap is a tool designed for threading the upper end of worn injector sleeves in Cummins ISX15/QSX15 DOHC and SOHC Series cylinder heads, as a preparatory step for sleeve removal. This tap is included in the Complete ISX15 / QSX15 DOHC Sleeve Removal and Installation Tooling Kit (PN: 450-6156-00) and the Complete ISX15 / QSX15 SOHC Kit with Toolbox (PN: 450-6157-00).

The Extended Tap is a specialized tool used in the process of removing worn injector sleeves from Cummins ISX15/QSX15 Series cylinder heads. This tool is a component of both the Complete ISX15 / QSX15 DOHC Sleeve Removal and Installation Tooling Kit (PN: 450-6156-00) and the Complete ISX15 / QSX15 SOHC Kit with Toolbox (PN: 450-6157-00), categorized under Sleeve Installation Tools.

The primary function of this Extended Tap is to create threads on the upper end of a worn injector sleeve. This threading provides a secure point of attachment for a sleeve removal tool (such as Part # 415-6136-00 used for DOHC engines), allowing it to be inserted and threaded into the sleeve to facilitate its extraction from the casting.

When using the Extended Tap, it is recommended to use a guide bushing (416-6156-32) to ensure proper alignment and straight threading. This guide bushing is included in the DOHC removal and installation kit.

Lubrication is essential during the tapping process. “EA” Lube (468-9910-08), which is suitable for stainless steel, should be applied to the tap to ensure smooth cutting and prevent damage to the tool and the sleeve.

Specifically for Cummins ISX15/QSX15 DOHC engines, it is recommended to install a sleeve hold down clamp (416-6154-40) through the inside of the sleeve and tighten it. This prevents the sleeve from rotating while the threads are being cut.

The recommended tapping depth into the injector sleeve is approximately ⅜” to ½”. This depth provides sufficient thread engagement for the sleeve removal tool to effectively pull the worn sleeve out.

While the Extended Tap is included in both the DOHC and SOHC sleeve removal kits, the detailed instructions for its specific use, including the steps, lubrication, and recommended tapping depth, are primarily described within the context of the DOHC sleeve removal procedure in the provided instructions.