E-cowlboy Crankshaft Seal Remover & Installer Set — Cummins 3.9L–6.7L (1989–2016), CNC Steel

E-cowlboy's front and rear crankshaft seal remover & installer set is a complete CNC-machined steel toolkit designed to remove and install crankshaft seals and wear sleeves on 1989–2016 Cummins and Paccar PX-6 engines without damaging components.

This precision tool set matches OEM dimensions and replaces multiple part numbers, giving technicians and DIYers a reliable way to service front and rear crank seals, install wear sleeves to the correct depth, and extract stubborn rear seals. Manufactured from heavy-duty black-anodized steel, the kit targets Cummins 4BT 3.9L, B Series 5.9L, ISB/ISL and QSB families through model year 2016. It suits common seal and sleeve references such as 3937111, 3904353, 3802820, 3934486, 5259499 and others used across Paccar and Cummins applications.

How does this set protect seals and sleeves during installation?

The kit is engineered to install seals and wear sleeves squarely and at the correct depth to avoid distortion or leaks. Smooth, CNC-formed faces distribute installation force evenly so rubber and metal parts aren’t warped or cut.

• Precision-machined mandrels match OEM diameters to ensure concentric seating
• Black-anodized steel resists corrosion and maintains straightness under impact
• Stacking/driver pieces prevent direct hammer damage to seals

Can this remove rear crankshaft seals that are stuck or corroded?

Yes — the remover fixtures are shaped to engage and extract rear crank seals without cutting into the housing. The design helps free seals that have seized from corrosion or long service life while minimizing risk to the crankcase bore.

• Specialized extractor geometry grips the seal for controlled removal
• Fits the common rear seal sizes used on Cummins 3.9L–6.7L engines
• Allows removal without resorting to improvised tools that can gouge surfaces

Which engines and part numbers does this tool set support?

The set covers a wide range of Cummins and Paccar PX-6 engines built from 1989 to 2016, including 4BT 3.9L, B Series 5.9L, ISB/ISL 5.9L–6.7L and QSB 5.9L–6.7L variants. It directly replaces many OEM service tools and part numbers so you can match it to the factory service instructions.

• Compatible with Paccar PX-6 and Cummins 4BT/ISB/ISL/QSB families
• Works with seals and sleeves like 3937111, 3904353, 3802820, 3934486
• Direct replacement for tool/part numbers such as 3824078, 5395259, 3164660 and ST-224C

What materials and build quality should I expect from this kit?

The tools are CNC-machined from premium steel and finished with black anodizing for added corrosion resistance and durability. High hardness and tight tolerances help maintain alignment and longevity in a shop environment.

• Heavy-duty steel body for impact resistance and long service life
• Black-anodized finish reduces rust and keeps tolerances stable
• Manufactured to OEM-style specifications for consistent fitment

Who is this for: This E-cowlboy tool set is aimed at professional diesel mechanics, fleet maintenance shops, and experienced home technicians who service Cummins 3.9L–6.7L engines or Paccar PX-6 vehicles. It’s useful when you need a repeatable, damage-free method to remove and install front and rear crankshaft seals and wear sleeves, match OEM service procedures, and avoid makeshift removal techniques that risk costly repairs. The product is backed by a 30-day return policy and a 12-month warranty for added confidence.