Bonbo Universal Cylinder Liner Puller for Heavy-Duty Diesel Engines — 3-7/8" to 6-1/4" Bore, Spring-Loaded Carbon Steel

The Bonbo Universal Cylinder Liner Puller is a heavy-duty, spring-footed tool engineered to remove wet cylinder liners from diesel engines with bores from 3-7/8" to 6-1/4" safely and without damaging the block.

This liner puller assembly is built for professional shops and experienced technicians who service Mack, Cummins, CAT, Volvo, Detroit, International and a broad range of heavy-duty diesel engines. It replaces OEM part numbers PT-6400-C, M50010-B and 3376015 and works on wet liners up to 15" deep and with a minimum wall thickness of .148. Constructed from hardened carbon steel and featuring spring-loaded feet, the tool is designed to speed removal, reduce downtime and protect cylinder bores during extraction.

How does the Bonbo puller prevent damage to the cylinder block?

The assembly uses adjustable, spring-loaded feet that center and grip the liner evenly, minimizing side loads and misalignment. Controlled axial pulling reduces the risk of scoring or fracturing the bore surface.

• Spring-loaded feet automatically conform to liner diameter for even pressure.
• Heavy-duty carbon steel construction resists deformation under load.
• Designed to extract liners straight out to avoid lateral contact with the block.
• Compatible with liners from 3-7/8" to 6-1/4" to ensure a proper fit rather than forceful removal.

Which engines and liners are compatible with this assembly?

The puller covers a wide range of heavy-duty diesel applications—Mack, Cummins, CAT and many OEM trucks—supporting multiple series and Maxxforce variants. It fits wet liners within the specified bore and depth ranges, replacing common OEM pullers.

• Fits Mack, Cummins, Volvo, Detroit, International and CAT engines including 3176, 3196, 3300, 3400, 3500 series and C10–C16 variants.
• Also compatible with Maxxforce DT, DT360, DTA360, DTA466, DT466, DT530, DT466E, DT530E, DT570, HT570.
• Replaces OEM PT-6400-C, M50010-B, 3376015 for direct interchangeability.
• Works with bores 3-7/8"–6-1/4", depths up to 15", wall thickness minimum .148".

What design features make it easy to use in a busy shop?

Practical upgrades focus on fast setup and reliable repeatable performance. The spring feet and robust central draw assembly let techs position and extract liners quickly, cutting service time.

• Spring-loaded feet auto-adjust to the liner, reducing setup time.
• High-precision machining ensures smooth operation and fewer adjustments.
• Durable, corrosion-resistant carbon steel lowers long-term replacement costs.
• Designed for repeated heavy use in professional repair environments.

What maintenance and warranty support come with the tool?

Basic upkeep includes cleaning and light lubrication of moving parts; inspect feet and threads for wear after heavy use. Bonbo backs the product with a 30-day satisfaction guarantee for returns and responsive customer support.

• Wipe clean and lightly lubricate threaded areas after each job.
• Inspect feet and contact surfaces for wear or deformation periodically.
• 30-day return policy for unsatisfied purchases with refund option.
• Customer support available for fitment and operation questions.

Who is this for: The Bonbo Universal Cylinder Liner Puller is aimed at professional diesel mechanics, fleet maintenance shops and heavy-equipment rebuilders who need a dependable, OEM-compatible tool for removing wet liners across a variety of engine families. If you service Mack, Cummins, CAT, Volvo, Detroit or International heavy-duty engines and require a rugged, easy-to-operate puller that fits a broad diameter range, this assembly is built for your workflow.