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Crankshaft for engine Cummins 3.9 3907803

Cummins 3.9 crankshaft (3907803) – durable engine part ensuring reliable performance and long service life in Cummins-powered machinery and vehicles.

  • Condition: reconditioned
  • SKU: 71856
Ocena 4,8

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Product description

Cummins 3.9 Crankshaft – durability and reliability

The crankshaft for the Cummins 3.9 engine (part no. 3907803) is a precisely manufactured component of the piston-crank system, converting the reciprocating motion of the pistons into rotary motion. Its correct operation is crucial for the entire engine cycle. Made from high-quality alloy steel and hardened with precision-ground journals, the shaft offers long service life, excellent resistance to dynamic loads, and minimal wear.

Technical data

  • Total length: approx. 720 mm
  • Main journal diameter: approx. 70 mm
  • Connecting rod journal diameter: approx. 60 mm
  • Weight: approx. 28 kg
  • Material: hardened alloy steel
  • Processing: precision grinding of working surfaces

Application

The Cummins 3.9 crankshaft is used in diesel engines installed in construction machinery, agricultural equipment, industrial vehicles, and generators. It fits the popular B-series engines known for their durability and efficiency. Replacement is recommended when journal wear, excessive bearing clearance, or mechanical damage due to lubrication failure occurs.

Properties and benefits

  • Load resistance – hardened for long-term operation under heavy loads.
  • Precision machining – ground surfaces reduce friction and improve engine performance.
  • Optimized lubrication – internal oil channels ensure even oil distribution.
  • Long service life – robust material and manufacturing technology ensure durability in harsh conditions.
  • Easy replacement – fully compatible with Cummins original specifications.

Specification

Specification Value
name Crankshaft for engine
mark Cummins
type 3.9
part number 3907803
condition reconditioned
total length 720 mm
main journal diameter 70 mm
connecting rod journal diameter 60 mm
weight 28 kg

Reference numbers

List of reviews:

Karol

2025-11-15

Produkt spełnia swoje funkcje, jednak warto zwrócić uwagę na jakość wykonania. Dobrze, że był po regeneracji, co może wpływać na jego trwałość.
Hubert

2025-10-04

Bardzo solidny wał korbowy, świetnie sprawdził się w moim silniku. Regeneracja na wysokim poziomie, wszystko działa bez zarzutu. Polecam!
Cezary

2025-09-15

Bardzo dobra jakość wału korbowego, idealnie pasuje do mojego silnika. Po regeneracji działa bez zarzutu. Polecam każdemu, kto szuka solidnych części do maszyn budowlanych.
Maciej

2025-06-24

Bardzo solidny wał korbowy, po regeneracji działa jak nowy. Zdecydowanie polecam, świetna jakość w rozsądnej cenie!

Write a review.

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Współpraca na wysokim poziomie. Firma na 6. Polecam z czystym sumieniem. Na pewno jeśli będę musiał to skorzystam jeszcze raz. Naprawa Pomp hydrauliki Koparka Terex

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