Skip to product information
SKU:
NLT1W01987
Ships for free in 2–4 business days.
Cummins 3.9L 5.9L 6.7L Front Crank Seal and Wear Sleeve Installer Kit
$68.99
In Stock
$68.99
Sale price
$68.99
Regular price
This front crankshaft seal and wear-sleeve installer kit services compatible Cummins 3.9L, 5.9L, and 6.7L engines, including 4BT, B-series, ISB, QSB, and Paccar PX-6 applications.
Estimated delivery between
Let Northline Parts Do the Heavy Lifting for You!
Not sure which part you need? Our team can help you find the right replacement.
Parts Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT
Live Chat: Available 24/7
I reached out for some replacement head bolts and they responded quickly with a few questions and cautionary information and is sending me some bolts. Great customer service! Thanks
Edward H. — Verified customer
Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
- 1989-2016 Cummins 4BT 3.9L
- 1989-2016 Cummins B-series 5.9L
- Cummins ISB 5.9L and 6.7L using compatible front seal
- Cummins QSB 5.9L and 6.7L using compatible front seal
- Paccar PX-6 with the matching Cummins-style front seal and sleeve
Product Overview
A new front seal can leak immediately when it is driven crooked, installed at the wrong depth, or damaged while passing over a worn crank surface. This tool supports square, depth-controlled installation instead of relying on a hammer and improvised driver.
The kit is intended for factory-style front seals 3937111, 3904353, and the seal used in kit 3802820, plus wear-sleeve service when the included components match. It installs parts; it is not itself an engine replacement part.
Key Features & Performance
- Dedicated front crank-seal installation tooling
- Wear-sleeve installation capability
- For Cummins 3.9L, 5.9L, and 6.7L families
- Helps keep the seal square and at the specified depth
- Reusable service tool set
Common Uses
- Installing a front crankshaft seal without distorting it
- Pressing a wear sleeve squarely over a grooved crank hub
- Completing timing-cover or front-cover reseal work
Technical Specifications
- Product Type: Crankshaft Seal and Wear Sleeve Installer Tool
- Primary Application: Cummins 4BT, B, ISB, and QSB engines
- Package Quantity: 1 installer kit
- Condition: New
- Replacement Type: Aftermarket
- Tool Type: Front crank seal and wear-sleeve installer
- Engine Sizes: 3.9L; 5.9L; 6.7L
- Known Seal References: 3937111; 3904353; 3802820 kit seal
- Application Years: Commonly 1989-2016
- Part Installed: Seal and/or repair sleeve; not included unless shown
Installation & Fitment
- Clean and inspect the crank surface and front cover
- Select the adapter that matches the seal and sleeve
- Lubricate or install dry exactly as the seal manufacturer specifies
- Drive or draw the part evenly to the service-manual depth and inspect the lip before reassembly
Compatibility Notice
Northline Parts does its best to list all known compatible models, but the correct part may fit an application not shown.
Model, production date, serial number, connector, dimensions, installed options, and previous repairs can affect fitment. Compare the original component and reference information before purchase.
Frequently Asked Questions
Q: Are the crankshaft seal and sleeve included? A: Do not assume so. This listing is for installer tooling; compare the package photo and contents.
Q: Why not tap the seal in with a generic driver? A: Uneven force can cock the seal, damage its lip, or place it at the wrong depth on the crank surface.
Q: How do I confirm this is the correct part? A: Match engine family, front seal number, crank nose and cover design, installer diameter, sleeve dimensions, required installation depth, and package contents.
Q: Is this supplied by the original equipment manufacturer? A: No. This is a new aftermarket item. Brand, model, and part numbers are used only to identify compatible applications.
Part Summary
keywords: Cummins front crank seal installer, 5.9 Cummins wear sleeve tool, 6.7 ISB seal installation kit, 4BT front cover seal tool, Cummins 3937111 installer
Brand names, model numbers, and reference part numbers are used for identification and compatibility purposes only. Verify the original component, dimensions, and application before purchase.