E-cowlboy Crankshaft Seal Remover & Installer Kit for Cummins 3.9L–6.7L (Front + Rear) — CNC Steel, Wear Sleeve Drivers

This E-cowlboy tool kit installs and removes front and rear crankshaft seals and wear sleeves on Cummins 3.9L–6.7L and Paccar PX-6 engines without harming the seal or shaft.

If you service Cummins B-Series, ISB/ISL, 4BT/6BT or QSB engines built between 1989 and 2016, this precision CNC-machined set is designed to make removing the rear crankshaft seal and pressing in front/rear seals and wear sleeves fast, accurate and repeatable. The kit replaces several OE tool references and fits common seal and sleeve part numbers used on Paccar PX-6 and Cummins platforms. Built from heavy-duty anodized steel, the components resist corrosion and deformation during repeated shop use.

How does this kit preserve seals and shafts during installation?

The installer cups and sleeves guide the seal into position evenly so the lip and body aren’t cocked or damaged. Correct seating depth is achieved without hammering directly on the seal, reducing the risk of leaks caused by improper installation.

• Dedicated driver and guide sleeves to distribute force uniformly
• Precision CNC fit minimizes lateral play on the crankshaft
• Predefined diameters match common Cummins seal and wear sleeve sizes
• Black anodized surface lowers galling and resists corrosion

Which engines and seal part numbers will this set cover?

The toolset was made to work across a range of Cummins and Paccar models from 1989–2016, including 4BT 3.9L, B Series 5.9L, ISB/ISL 5.9L–6.7L, ISC 8.3L and QSB variants. It fits many commonly used seal and wear-sleeve references so you don’t need separate specialty tools for each model.

• Compatible with Paccar PX-6 and Cummins engine families listed above
• Works with seal/sleeve numbers like 3937111, 3904353, 3802820 and 3934486
• Direct replacement for OE tool numbers such as ST-224C, 3824078 and 2063800090
• Suitable for both front and rear crankshaft seal jobs

What makes the construction of this toolset dependable for repeated shop use?

Components are CNC machined from high-strength steel and finished with a black anodized coating to resist impact, rust and wear. Tight tolerances and hardened surfaces maintain accurate alignment and service life when used with appropriate shop techniques.

• High-precision CNC machining for consistent fitment
• Hardened steel construction resists deformation under load
• Anodized finish improves corrosion resistance and longevity
• Designed to OEM specifications for professional results

How does the toolset save time and reduce repair costs?

By providing the correct driver sizes and a removal tool for rear seals, the set eliminates makeshift methods that risk damage and rework. Faster, accurate installs reduce downtime and the chance of having to replace an incorrectly seated seal or damaged wear sleeve.

• Removes need for multiple specialized tools or improvised techniques
• Speeds up seal and sleeve changeouts with repeatable alignment
• Reduces risk of seal leakage from improper installation
• Compatible with a wide range of models to avoid multiple tool purchases

Who is this for: This E-cowlboy crankshaft seal remover and installer kit is aimed at professional diesel mechanics, fleet maintenance shops, and advanced DIY technicians who work on Cummins-powered trucks and equipment from 1989–2016. If you regularly service Paccar or Cummins engines and need a durable, accurate tool to remove rear seals and install front/rear seals and wear sleeves without damaging components, this set is built to meet those demands while replacing several OEM tool numbers and common part references.