Guide Bushing-Volvo D13/Mack MP8

This guide bushing is part of the Volvo D13 / Mack MP8 injector seat tooling system. It slips over the End Facing Counter Bore Cutter (PN 445‑6683‑30) and works with the Counterbore Pilot (PN 416‑6158‑62) and Driving Arbor (PN 414‑6114‑10) to support and guide the cutter in the injector bore. The bushing helps keep the cutter stable and aligned while re‑facing the injector sleeve seat in the cylinder head prior to installing a new stainless steel sleeve (PN 419‑6681‑05).

Guide Bushing – Volvo D13 / Mack MP8

This guide bushing is a precision support component used in the injector seat re‑machining process on Volvo D13 and Mack MP8 cylinder heads. It is designed to fit over the End Facing Counter Bore Cutter (PN 445‑6683‑30) and ride in the injector bore, working together with the Counterbore Pilot (PN 416‑6158‑62) to keep the cutter properly aligned as it cleans and re‑faces the injector sleeve seat.

By stabilizing the cutter, the bushing helps produce a flat, concentric sealing surface for the new injector sleeve.

Engine‑Specific Support for the Cutter

• Sized for the injector bore used in Volvo D13 heads
• Fits the same geometry in Mack MP8 cylinder heads
• Matches the OD of the counterbore cutter body for a controlled, guided fit

The guide bushing and pilot together control the cutter’s position in both radial and axial directions, which is critical for achieving a precise seat in these specific engines.

How the Guide Bushing Is Used

As described in Irontite’s Injector Sleeve Removal & Installation Manual (Doc PN 451‑3540‑13), the guide bushing is part of the counterboring setup:

1. Assemble the cutter, pilot, and bushing

   • Install the Counterbore Pilot (PN 416‑6158‑62) into the End Facing Counter Bore Cutter (PN 445‑6683‑30) and secure it with the set screw.
   • Slide this guide bushing over the cutter on the end that will enter the injector bore.

2. Mount in the driving arbor

   • Insert the cutter—with pilot and bushing installed—into the Driving Arbor (PN 414‑6114‑10).

3. Position in the injector bore

   • Place the assembly into the injector bore on the top side of the cylinder head.
   • The pilot centers the cutter in the bore, and the bushing provides added radial support along its length.

4. Apply cutting fluid and machine the seat

   • Use EA Lube (PN 468‑9910‑08) to lubricate the cutter and bore.
   • With the support of the pilot and bushing, run the cutter at approximately 60–80 RPM to clean and re‑face the injector seat, removing only about 0.002”–0.005” of material.

The guide bushing helps keep the cutter running true, reducing chatter and uneven cutting, especially important when working in cast iron heads.

Why the Guide Bushing Is Important

Using the proper guide bushing:

• Improves cutter stability and reduces vibration during machining
• Helps maintain concentricity between the injector bore and sleeve seat
• Enhances surface finish on the re‑faced seat, promoting better sealing for the new sleeve
• Reduces tool wear and risk of damage from misalignment or chatter
• Contributes to consistent results across all injector bores in the same head

Without the correct bushing, even a good cutter and pilot can produce a seat that is less stable, with more chatter marks or slight misalignment.

Part of the Volvo D13 / Mack MP8 Professional Kit

This guide bushing is included in the Irontite Volvo D13 / Mack MP8 Injector Sleeve Professional Kit (PN 451‑6681‑00) together with:

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

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

Ideal Users

• Diesel engine rebuilders and machining shops
• Heavy‑duty truck engine service facilities
• Fleet maintenance departments reconditioning Volvo D13 / Mack MP8 heads

Any shop that frequently machines injector sleeve seats on these engines will benefit from having the correct, application‑specific guide bushing to support the cutter.

Key Features

• Guide bushing for injector seat tooling on Volvo D13 / Mack MP8 cylinder heads
• Used with End Facing Counter Bore Cutter (PN 445‑6683‑30), Counterbore Pilot (PN 416‑6158‑62), and Driving Arbor (PN 414‑6114‑10)
• Stabilizes and guides the cutter in the injector bore
• Helps achieve flat, concentric, high‑quality injector sleeve seats
• Designed for repeated use in professional engine rebuilding environments
• Included in Irontite’s Volvo D13 / Mack MP8 Injector Sleeve Professional Kit (PN 451‑6681‑00)