Small Tip Bore Brush-Volvo D13/Mack MP8

This small tip bore brush is used to clean the lower tip area of the injector sleeve bore on Volvo D13 and Mack MP8 cylinder heads. Working in the narrow combustion‑end section that larger brushes can’t reach, it removes carbon, rust, and residue so the injector seat can be properly machined with the End Facing Counter Bore Cutter (PN 445‑6683‑30) and prepared for installation of a new stainless injector sleeve (PN 419‑6681‑05).

Small Tip Bore Brush – Volvo D13 / Mack MP8

This small tip bore brush is a specialized cleaning tool designed to reach the narrow lower tip area of the injector sleeve bore in Volvo D13 and Mack MP8 cylinder heads. It targets the combustion‑end region where carbon, rust, and deposits tend to build up around the injector sleeve opening.

By thoroughly cleaning this tight area, the brush helps ensure proper machining, sleeve fit, and sealing when replacing injector sleeves.

Engine‑Specific Fit

• Sized for the small tip bore at the combustion‑chamber end of Volvo D13 injector sleeve locations
• Also fits the same area in Mack MP8 cylinder heads
• Complements the larger Combo Large Brush – Upper Bore/Face (PN 450‑6951‑07)

Where the combo large brush cleans the upper bore and face, this small brush is focused on the lower, restricted region of the bore that larger tools cannot effectively reach.

Role in the Injector Sleeve Service Procedure

In Irontite’s Injector Sleeve Removal & Installation Manual (Doc PN 451‑3540‑13), this brush is used as part of the cleaning steps before machining and sleeve installation:

1. After sleeve removal

   • Once the old injector sleeve has been removed, loose debris, scale, and carbon remain in both the upper bore and lower tip area.

2. Clean the tip bore area

   • The small tip bore brush is inserted from the combustion‑chamber side to scrub the lower portion of the injector bore around the sleeve tip opening.
   • It removes stubborn deposits that could interfere with the Tip Expander (PN 445‑6681‑21), Tip Expander Driver (PN 445‑6681‑25), or sealing at the combustion end of the new sleeve.

3. Follow with upper bore/face cleaning and machining

   • The upper bore and face are then cleaned using the combo large brush (PN 450‑6951‑07).
   • The End Facing Counter Bore Cutter (PN 445‑6683‑30), guided by the Counterbore Pilot (PN 416‑6158‑62) and Guide Bushing (PN 416‑6158‑32), is used to re‑face the injector seat.
   • A clean, debris‑free tip area helps ensure chips and cutting fluid exit properly and do not pack up around the sleeve nose.

4. Before final expansion

   • After the new stainless steel sleeve (PN 419‑6681‑05) is installed with Permatex 64000 High Heat Sleeve Retainer (PN 468‑9640‑00), the tip bore area must again be free of debris so the tip expander can pass smoothly through the sleeve nose.

Benefits of Using the Correct Small Brush

Using the dedicated small tip bore brush:

• Improves cleanliness in the tight combustion‑end area of the injector bore
• Reduces contamination that could interfere with seat machining, bonding, or expansion
• Helps protect tools such as the tip expander and cutter from abrasive debris
• Supports better sealing at the combustion end of the injector sleeve
• Speeds up prep work vs. improvised or oversized brushes that can’t reach properly

A clean tip bore is essential for a high‑quality, long‑lasting injector sleeve repair.

Part of the Volvo D13 / Mack MP8 Professional Kit

This small tip bore brush is included in the Irontite Volvo D13 / Mack MP8 Injector Sleeve Professional Kit (PN 451‑6681‑00) along with:

• Combo Large Brush – Upper Bore/Face (PN 450‑6951‑07)
• Sleeve Removal Tool (PN 445‑6682‑10)
• Tip Expander and Tip Expander Driver (PNs 445‑6681‑21 and 445‑6681‑25)
• End Facing Counter Bore Cutter (PN 445‑6683‑30) with Counterbore Pilot (PN 416‑6158‑62) and Guide Bushing (PN 416‑6158‑32)
• Driving Arbor (PN 414‑6114‑10)
• EA Lube cutting fluid (PN 468‑9910‑08)
• Permatex 64000 Sleeve Retainer (PN 468‑9640‑00) and Permatex Anti‑Seize (PN 468‑9771‑34)
• Metal toolbox and instructions

It can also be purchased individually as a replacement consumable for shops that already own the full kit.

Ideal Users

• Diesel engine rebuilders and head shops
• Heavy‑duty truck repair facilities
• Fleet maintenance departments servicing Volvo D13 / Mack MP8 engines

Any operation performing injector sleeve replacements or head reconditioning on these engines will benefit from having the correct small brush for tip bore cleaning.

Key Features

• Small tip bore brush tailored for Volvo D13 / Mack MP8 injector sleeve locations
• Cleans the tight lower tip area at the combustion‑chamber end of the bore
• Complements the combo large upper bore/face brush (PN 450‑6951‑07)
• Helps prepare the bore for machining and new sleeve installation
• Designed for repeated professional use
• Included in Irontite’s Volvo D13 / Mack MP8 Injector Sleeve Professional Kit (PN 451‑6681‑00)