---
product_id: 75703292
title: "bt 1# 3978022 3914086 Belt TENSIONER FITS for Cummins Engine 6BT5.9"
brand: "mottrol"
price: "¥20321"
currency: JPY
in_stock: true
reviews_count: 1
url: https://www.desertcart.jp/products/75703292-bt-1-3978022-3914086-belt-tensioner-fits-for-cummins-engine
store_origin: JP
region: Japan
---

# Optimized for Cummins 6BT5.9 3-month warranty included Precision-engineered fit bt 1# 3978022 3914086 Belt TENSIONER FITS for Cummins Engine 6BT5.9

**Brand:** mottrol
**Price:** ¥20321
**Availability:** ✅ In Stock

## Summary

> ⚙️ Keep your engine running smooth—because every second counts!

## Quick Answers

- **What is this?** bt 1# 3978022 3914086 Belt TENSIONER FITS for Cummins Engine 6BT5.9 by mottrol
- **How much does it cost?** ¥20321 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/75703292-bt-1-3978022-3914086-belt-tensioner-fits-for-cummins-engine)

## Best For

- mottrol enthusiasts

## Why This Product

- Trusted mottrol brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Quick Installation:** Engineered for hassle-free replacement, minimizing downtime and maximizing productivity.
- • **Ready When You Are:** In-stock and ready to ship, so your engine maintenance never misses a beat.
- • **Seamless Compatibility:** Specifically designed for Cummins 6BT5.9 engines ensuring perfect alignment and performance.
- • **Durability You Can Trust:** Crafted with high-quality materials to withstand intense engine stress and extend belt life.
- • **Warranty-Backed Confidence:** Includes a 3-month warranty to guarantee peace of mind with every purchase.

## Overview

This aftermarket belt tensioner (part numbers 3978022 and 3914086) is a direct replacement designed for the Cummins 6BT5.9 engine. It ensures precise fitment and reliable belt tension, backed by a 3-month warranty and immediate availability for quick engine maintenance.

## Description

3978022 3914086 Belt Tensioner Fits For Cummins Engine 6BT5.9, Aftermarket Replacement Parts, Warranty 3 Month, New, In Stock.

## Features

- Description: 3978022 3914086 Belt Tensioner
- Application Model: 6BT5.9
- Engine Parts Can Be Supplied Including Liner Kit, Liner, Piston, Piston Ring, Main Bearing, Con Rod Bearing, Gasket Kit, Crankshaft, Camshaft, Cylinder Block, Cylinder Head, Plunger, Delivery Valve, Nozzle, Oil pump, Connectiong Rod, Feed Pump, Water Pump, Fan Blade, Turbocharger, Engine Assy, Nozzle Piping, Thermostat, Seat Thermostat, Belt Tensioner, Pulley, Oil Cooler Core, Oil Cooler Cover Etc.

## Images

![bt 1# 3978022 3914086 Belt TENSIONER FITS for Cummins Engine 6BT5.9 - Image 1](https://m.media-amazon.com/images/I/31xGMG6O-cL.jpg)
![bt 1# 3978022 3914086 Belt TENSIONER FITS for Cummins Engine 6BT5.9 - Image 2](https://m.media-amazon.com/images/I/713GlT8Ga1L.jpg)
![bt 1# 3978022 3914086 Belt TENSIONER FITS for Cummins Engine 6BT5.9 - Image 3](https://m.media-amazon.com/images/I/71NxFoOAPbL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐ 







  
  
    Case wanted much more for same product
  

*by J***Y on Reviewed in the United States on December 2, 2018*

I bought this for my bulldozer.. I have a 4bt Cummins and it works perfect.. It doesn’t say in the item description that it will work on a 4bt but it will..

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**Shop now:** [https://www.desertcart.jp/products/75703292-bt-1-3978022-3914086-belt-tensioner-fits-for-cummins-engine](https://www.desertcart.jp/products/75703292-bt-1-3978022-3914086-belt-tensioner-fits-for-cummins-engine)

---

*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-01-22*