If you have spent any amount of time working with engines, whether they are diesel or gas-powered, you have likely come across discussions or demonstrations involving crankshafts. These seemingly simple yet intricately designed moving parts play a vital role in ensuring the smooth operation of an engine, keeping the pistons and other crucial components in motion.

However, it is important to be aware that crankshafts can, in fact, become bent. Yes, it is true! But fear not, for there are measures you can take to help prevent this issue from occurring. Furthermore, it is equally important to understand the causes behind a bent crankshaft in order to effectively address the problem. In this post, we will delve into all of these matters and more, providing you with the knowledge you need.

 

 

At FAB Heavy Parts, we are deeply committed to assisting you in maintaining the optimal performance of your diesel engine. We understand the significance of identifying and addressing potential issues before they escalate into more serious problems. With this in mind, we have crafted this comprehensive article to equip you with the necessary information should you suspect that your rig's engine may be afflicted with a bent crankshaft.

 

What is a crankshaft?

A crankshaft is a vital component found in the engine of a vehicle. It plays a fundamental role in converting linear energy into rotational energy, which is crucial for propelling the car forward. The crankshaft is intricately connected to various engine parts, such as the pistons and the flywheel, working in harmony to achieve a synchronized motion.

Understanding the function and operation of a crankshaft is essential for identifying any potential issues. In simple terms, the crankshaft acts as a guide for the pistons throughout their stroke. Its primary responsibility is to precisely harness the power and torque generated during the combustion process and transform it into useful mechanical energy.

Diesel engines, much like any other internal combustion engines, operate within extremely tight tolerances. Even the slightest defect or deformation can disrupt the delicate balance within the engine. To withstand the high torque and horsepower demands of a diesel engine, crankshafts are typically constructed from robust steel or durable cast iron materials.

 

4 Common causes of diesel crankshaft bending

Understanding the reasons behind a diesel crankshaft bending is crucial in order to address the issue effectively. Let's delve into the most prevalent causes, although it's important to note that these are not the only possibilities.

1. Excessive heat

Diesel engines are notorious for generating high levels of heat. Designed to withstand immense pressure, they often endure more than their gasoline counterparts. However, even the strongest and most resilient components can succumb to bending under extreme heat. The accumulated heat weakens the structure, making it susceptible to deformation.

 

2. Bearing Failure

Crankshafts rely on bearings to maintain stability between the engine block and the crankshaft itself. When these bearings fail or become excessively worn, the crankshaft develops unwanted play. It is crucial to address this issue promptly to prevent further complications within your diesel engine.

 

3. Suboptimal operating conditions

Ensuring that all aspects of your engine are in optimal condition is the best preventive measure against crankshaft problems. Several factors contribute to preventing early crankshaft failure. Avoiding over-revving the engine or subjecting it to unnecessary stress are among the best practices to protect against warping or bending of the crankshaft.

 

4. Improper handling

Despite their robust construction, crankshafts can easily sustain damage if mishandled during the installation process. Even a simple act like dropping or accidentally striking the crankshaft before installation can result in deformation. It is crucial to exercise utmost care and precision when handling this critical engine component.

The crankshaft in your diesel engine undergoes precise machining and meticulous balancing to ensure smooth operation without introducing vibration or exerting undue stress on other vital engine parts. By addressing these common causes of crankshaft bending, you can enhance the longevity and performance of your diesel engine.

 

What kind of damage can be done by a bent crankshft?

The presence of a bent crankshaft can have detrimental effects on the overall condition and performance of your engine. One of the most significant risks associated with a bent crankshaft is the potential damage it can cause to the main bearings. When the crankshaft is bent, it reduces the oil clearance, which can lead to further harm within your diesel engine.

It is important to note that there are several other engine issues that can mimic the symptoms of a crankshaft problem. The modern diesel engine is a highly complex system, and even minor errors in torque application or incorrect bolt sequencing can result in severe complications down the line.

Another common cause of engine issues similar to those associated with a bent crankshaft is a distorted crankcase. This distortion can be attributed to factors such as exposure to high temperatures or excessive stress. These conditions can inflict damage not only on the crankcase itself but also on other vital components such as the pistons.

Identifying the exact source of the problem can often prove to be a challenging task. In cases where a bent crankshaft is suspected, a complete engine teardown may be the only viable solution. This thorough examination allows for a comprehensive assessment of the extent of the damage and facilitates the necessary repairs or replacements to restore the engine's optimal functioning.

It is crucial to address any potential issues with the crankshaft promptly to prevent further complications and ensure the longevity of your engine. Regular maintenance and careful monitoring of the engine's performance can help detect and mitigate problems associated with a bent crankshaft or other related engine issues.

 

Popular Crankshafts

1. OEM Crankshaft for Kubota

Crankshaft 7024264 1G381-23010 for Kubota V3800 V3800T Engine

Condition: new, OEM

Part number: Bobcat 7024264, Kubota 1G381-23010

Fit For Kubota Engine: V3800, V3800T

Applications:
Fit For Bobcat All-Wheel Steer Loader: A770
Fit For Bobcat Skid-Steer Loader: S750, S770, S850
Fit For Bobcat Compact Track Loader: T750, T770, T870

 

2. Crankshaft for Komatsu

Crankshaft 6202-31-1100 for Komatsu 4D95S-W 4D95S Engine

Part number: 6202-31-1100, 6202311100
Application:
4D95S-W-1J S/N 39040-UP
4D95S-W-1G-T S/N 23318-UP
4D95S-W-1G-T S/N 23318-UP (Trimming Dozer)
4D95S-W-1G-S S/N 23318-UP ENGINES
4D95S-W-1G-S S/N 23318-UP
4D95S-W-1G-Q S/N 23318-UP
4D95S-W-1G-PL S/N 23318-UP ENGINES
4D95S-W-1G-PL S/N 23318-UP
4D95S-W-1G-P S/N 23318-UP
4D95S-W-1G-E S/N 23318-UP
4D95S-W-1G-BP S/N 23318-UP
4D95S-W-1G-AS S/N 23318-UP
4D95S-W-1G-AP S/N 23318-UP ENGINES
4D95S-W-1G-AP S/N 23318-UP
4D95S-W-1G-A S/N 23318-UP ENGINES
4D95S-W-1G-A S/N 23318-UP ...

 

3. OEM Crankshaft for Doosan

Crankshaft For Doosan D24 Engine 7030327 7386493 Bobcat S510 S530 S570 S590 T550

Condition: new, OEM

Part Number: 7030327, 7386493

Applications:
Engine Doosan D24
Bobcat S510 S530 S570 S590 T550 T590

 

4. New Crankshaft for Yanmar

New Crankshaft 129004-21002 for Yanmar 3TNV88 Engine w/ Gear

Condition: new, aftermarket

Part Number:
129001-21000, 129001-21100, 12900121000, 12900121100, 129004-21000, 129004-21001, 129004-21002, 12900421000, 12900421001, 12900421002, 129008-21000, 12900821000, Y129001-21000, Y12900121000, Y12900121100, Y129004-21000, Y129004-21001, Y129004-21002, Y12900421000, Y12900421001, Y12900421002, Y129008-21000, Y12900821000

Application:
Yanmar Engine: 3TNV88-BDCR, 3TNV88-BDVR, 3TNV88-BKMW, 3TNV88-BPTB, 3TNV88-BPTB2, 3TNV88-BPYB, 3TNV88-DCR, 3TNV88-DSAP, 3TNV88-EMS, 3TNV88-GYM....
Yanmar Excavator: ViO30, ViO33, ViO35, ViO35-5
Yanmar Loader: V3-6
Komatsu Engine: 3D88E-5P-BA, 3D88E-6BP-DA, 3D88E-6, 3D88E, 3D88E-5NFA
Komatsu Excavator: PC35MR-2NA, PC35MR-2-NB, PC35MR-2-SA, PC35MR-2-SB, PC30MR-3, PC35MR-2, PC35MR-2-A, PC35MR-2-B, PC35MR-3, PC35R-8
Komatsu Loader: WA30-6
CASE Model: CX31B, CX36B

 

Enjoy a splendid $30 discount on all Crankshafts! Don't miss out on this fantastic offer. Shop now and upgrade your vehicle with top-notch quality. Hurry, limited stock available!

Click: https://www.fabheavyparts.com/collections/crankshaft

 

Welcome to Fab Heavy Parts' online catalog, where you can explore a delightful array of crankshafts.  We have a diverse selection to cater to your needs. Our knowledgeable parts team is at your disposal, ready to assist you every step of the way.