Danti Rear Main Crankshaft Seal & Wear Sleeve Installer ST-224C for Cummins/Paccar — Carbon Steel, Heavy‑Duty

The Danti ST-224C rear main crankshaft seal and wear sleeve installer is a heavy-duty tool engineered to install and remove rear crankshaft seals and sleeves for Cummins 3.9L–9.0L and Paccar PX-6/PX-8 engines with minimal risk to the crankshaft surface.

When replacing a rear main seal or wear sleeve on large diesel engines, using the right installer prevents seal damage and saves hours of labor. The ST-224C (alternative part references: 5395259, 3824078, 2063800090) is crafted from corrosion-resistant carbon steel and shaped to fit common seal sizes and housings used on Cummins B-Series, ISB/ISL/ISC, QSB, and Paccar powerplants. It’s a purpose-built tool meant to speed the job while protecting mating surfaces.

How does this tool reduce risk when removing a rear crankshaft seal?

Removing a rear main seal with improvised tools can nick the crankshaft or housing, leading to oil leaks and costly repairs. The ST-224C centers on the shaft and provides even pressure during removal to avoid gouges or uneven wear on the seal surface.

• Precision-fit geometry that aligns with common Cummins and Paccar housings.
• Uniform force distribution lowers chance of seal lip distortion.
• Carbon steel construction resists bending under load.

What engine models and seal numbers is it compatible with?

This installer supports a broad range of diesel applications. It’s suitable for Paccar PX-6 and PX-8 applications and for many Cummins models including 4BT 3.9L, B-Series 5.9L, ISB/ISL 5.9L–6.7L, QSB 5.9L–6.7L, ISC 8.3L, and ISL9 9.0L.

• Works on seals referenced as 5259499, 3926126, and MAHLE 67857.
• Equivalent to OE numbers 3824078, 3163734, 3163628, 2063800090, 3163741.
• Designed to match common rear seal and sleeve dimensions on listed engines.

What are the build quality and materials used?

The tool is manufactured from high-grade carbon steel, chosen for strength and resistance to corrosion and impact. That heavy-duty construction ensures the installer remains square and reliable during repeated professional use.

• Carbon steel body for long service life and toughness.
• Surface finish to resist rust in shop environments.
• Engineered tolerances to avoid deformation under torque.

How does this installer speed up a seal replacement job?

By combining correct fitment with sturdy construction, the ST-224C streamlines removal and installation steps. Technicians spend less time improvising, reduce repeat work, and maintain consistent results across multiple service events.

• Speeds removal of worn seals and installation of new sleeves/seals.
• Minimizes need for additional machining or part replacement due to damage.
• Reduces labor downtime on heavy-duty diesel service tasks.

Who is this for: The Danti ST-224C is intended for professional diesel technicians, fleet maintenance shops, and experienced DIYers who service Cummins and Paccar engines. If you regularly work on 3.9L to 9.0L Cummins engines or PX-6/PX-8 Paccar units and need a reliable way to remove and press-fit rear main seals and wear sleeves without harming crankshaft surfaces, this tool is built for that job.