The crankshaft turns the reciprocating motion of the pistons and connecting rods into the rotational motion that turns the transmission gears, axle shafts, and ultimately the wheels. The crankshaft turns on its axis in the cylinder block. The connecting rods are attached to offset crank throws, which enable the conversion of motion. Cast iron is commonly used to make low output engine crankshafts, while forged steel is needed for high horsepower motors.

Featured Products

  • Dorman® Crankshaft Position Sensor
    (0 reviews)
    # sp4122
    Crankshaft Position Sensor by Dorman®. Engine Crankshaft Position Sensors measure crankshaft location to detect misfire and control engine timing. Dorman’s Engine Crankshaft Position Sensors are constructed of high quality...
    $8.56 - $78.64
  • Hitachi® Engine Crankshaft Position Sensor
    (0 reviews)
    # sp5072
    Engine Crankshaft Position Sensor by Hitachi®. By monitoring crankshaft rotation speed and position, this sensor allows the computer to maintain effective fuel injection timing and ignition timing control for optimal engine...
    $26.13 - $76.25
  • Beck Arnley® Crankshaft Position Sensor
    (1 reviews)
    # sp9428
    Crankshaft Position Sensor by Beck Arnley®. For one hundred years, Beck/Arnley has been providing premium OE quality parts for vehicles. Beginning with motorcycle parts in 1914 and transitioning to import vehicles in the 1950’s,...
    $19.87 - $792.72
  • Delphi® Engine Crankshaft Position Sensor
    (0 reviews)
    # sp5760
    Engine Crankshaft Position Sensor by Delphi®. Delphi sensors use the Hall Effect or magneto resistive (MR) principles for accurate and clean signal input to the electronic control module (ECM). The result is more design flexibility...
    $20.94 - $91.08
  • Fel-Pro® Engine Crankshaft Seal Kit
    (1 reviews)
    # sp4487
    Engine Crankshaft Seal Kit by Fel-Pro®. If you are looking for quality sealing solutions, Fel-Pro offers you various replacement products from seals and bolts to O-Rings and dowel pins. Engineered using the latest technologies and...
    $5.19 - $152.49
  • National® Engine Crankshaft Repair Sleeve
    (0 reviews)
    # sp4816
    Engine Crankshaft Repair Sleeve by National®. This part is manufactured by one of the most trusted names in the automotive industry to keep your vehicle perform optimally. It is built to the original equipment specifications to...
    $22.38 - $66.41
  • ACDelco® GM Original Equipment™ Engine Crankshaft Position Sensor
    (0 reviews)
    # sp10341
    GM Original Equipment™ Engine Crankshaft Position Sensor by ACDelco®. An ACDelco GM Original Equipment Engine Crankshaft Position Sensor monitors the position and rotational speed of the crankshaft, and is a GM-recommended...
    $16.53 - $112.79
  • National® Engine Crankshaft Seal
    (0 reviews)
    # sp4815
    Engine Crankshaft Seal by National®. Don’t just repair a leak, prevent future problems with a National Oil Seal. This part is manufactured using exclusive National Dynamic Edge technology that generates a dynamic pumping action...
    $4.90 - $60.57
  • Timken® Engine Crankshaft Seal
    (0 reviews)
    # sp5023
    Engine Crankshaft Seal by Timken®. Timken offers the right seal to keep your vehicle running optimally. Timken seals provide ultimate protection from contaminants and help retain lubricants and liquids, ensuring reliable vehicle...
    $3.72 - $100.79
  • Bosch® Crank Position Sensor
    (0 reviews)
    # sp5757
    Crank Position Sensor by Bosch®. The engine crank angle sensor that fails to perform can cause poor engine performance or its stalling. Replace your faulty sensor with the Engine Crank Angle Sensor from Bosch. It's precision built...
    $18.74 - $343.38
  • Auto 7® Engine Crankshaft Position Sensor
    (0 reviews)
    # sp4982
    Engine Crankshaft Position Sensor by Auto 7®. Over the lifespan of your vehicle your engine's parts can become worn and in need of replacement. This can cause serious problems including power and fuel economy loss. Auto 7 has the...
    $22.31 - $92.65
  • Continental® ContiTech™ Crankshaft Seal
    (0 reviews)
    # sp5387
    ContiTech™ Crankshaft Seal by Continental®. When high durability and reliable performance are needed, turn to this seal that is designed to withstand heavy abuse, pressure, heat and oil. Manufactured in an ISO/TS 16949:2002...
    $2.28 - $21.06
  • ACDelco® GM Original Equipment™ Engine Crankshaft Pulley
    (0 reviews)
    # sp10354
    GM Original Equipment™ Engine Crankshaft Pulley by ACDelco®. Designed utilizing the latest technology, this GM Original Equipment Crankshaft Pulley by ACDelco features premium quality and will perform better than advertised....
    $35.28 - $145.47
  • AJUSA® Crankshaft Seal
    (0 reviews)
    # sp5343
    Crankshaft Seal by AJUSA®. If you are looking for quality sealing solutions, Ajusa offers you various replacement products from seals and bolts to O-Rings and dowel pins. Engineered using the latest technologies and global...
    $4.94 - $55.34
  • Victor Reinz® Crankshaft Repair Sleeve
    (0 reviews)
    # sp5670
    Crankshaft Repair Sleeve by Victor Reinz®. When you’re low on oil, coolant or some other fluid, you may be tempted to just run down to the local auto parts chain store. But before you waste your time and gas only to find high...
    $12.05 - $12.48
  • Mr. Gasket® Crankshaft Main Bearing Gasket Set
    (0 reviews)
    # sp2824
    Crankshaft Main Bearing Gasket Set by Mr. Gasket®. Building up a new engine for your ride? Mr. Gasket has the gaskets, fasteners and other internal parts for building a race engine vs. a street motor.
    $15.27 - $35.96
  • Victor Reinz® Main Bearing Gasket Set
    (0 reviews)
    # sp5632
    Main Bearing Gasket Set by Victor Reinz®. When you’re low on oil, coolant or some other fluid, you may be tempted to just run down to the local auto parts chain store. But before you waste your time and gas only to find high...
    $6.45 - $64.65
  • Fel-Pro® Engine Main Bearing Repair Sleeve
    (0 reviews)
    # sp4495
    Engine Main Bearing Repair Sleeve by Fel-Pro®. If you are looking for quality sealing solutions, Fel-Pro offers you various replacement products from seals and bolts to O-Rings and dowel pins. Engineered using the latest...
    $7.98 - $14.00
  • Dorman® Engine Rear Main Seal Cover
    (0 reviews)
    # sp6864
    Engine Rear Main Seal Cover by Dorman®. Ensure the proper sealing of the engine with Dorman’s Engine Rear Main Seal Cover. The Seal Cover is designed from high-quality materials to stop and prevent engine oil leakage.
    $38.27 - $159.43
  • Timken® Engine Crankshaft Repair Sleeve
    (0 reviews)
    # sp5024
    Engine Crankshaft Repair Sleeve by Timken®. Repair sleeves restore the sealing surface on yokes and shafts, avoiding expensive components replacement. This hard, wear-resistant, and ultra low friction sleeve is precision...
    $6.80 - $68.56
  • Auto 7® Engine Crankshaft Main Bearing Set
    (0 reviews)
    # sp4930
    Engine Crankshaft Main Bearing Set by Auto 7®. Over the lifespan of your vehicle your engine's parts can become worn and in need of replacement. This can cause serious problems including power and fuel economy loss. Auto 7 has the...
    $8.84 - $118.56
  • Cloyes® Timing Crankshaft Sprocket
    (0 reviews)
    # sp5235
    Timing Crankshaft Sprocket by Cloyes®. Keep your engine’s valvetrain in perfect time with Cloyes, the world leader in timing drive systems. No matter whether you need a timing gear or complete timing gear set, Cloyes has the OE...
    $2.74 - $69.41
  • ACDelco® GM Original Equipment™ Crankshaft Oil Seal
    (0 reviews)
    # sp11697
    GM Original Equipment™ Crankshaft Oil Seal by ACDelco®. Designed utilizing the latest technology, this Crankshaft Oil Seal by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and...
    $8.50 - $28.13
  • GLYCO® Crankshafts Bearings
    (0 reviews)
    # sp2002
    Crankshafts by Glyco®. Is your vehicle feeling down on power? Do you see dark puddles on the ground when you park? Is your CHECK ENGINE light on? Your engine may be in need of repair, but before you waste your time and gas running...
    $2.77 - $243.68
  • ACDelco® Professional™ Engine Crankshaft Position Sensor Connector
    (0 reviews)
    # sp10344
    Professional™ Engine Crankshaft Position Sensor Connector by ACDelco®. Designed utilizing the latest technology, this Engine Crankshaft Position Sensor by ACDelco features premium quality and will perform better than advertised....
    $8.91 - $120.21
  • Omix-Ada® Crankshaft Gear
    (0 reviews)
    # sp1379
    Crankshaft Gear by Omix-Ada®. The crankshaft drives the camshaft and valvetrain via timing sprockets and chain or timing gears. The valves are timed to open and close at precise intervals, and this timing can go astray when...
    $8.52 - $168.99
  • Omix-Ada® Crankshaft Positioning Sensor
    (0 reviews)
    # sp1366
    Crankshaft Positioning Sensor by Omix-Ada®. As its name implies, the Crankshaft Position Sensor detects the position and rotational speed of the crankshaft and sends this information via voltage signal to the engine control...
    $8.52 - $168.99
  • Victor Reinz® Crankshaft Seal
    (0 reviews)
    # sp5669
    Crankshaft Seal by Victor Reinz®. When you’re low on oil, coolant or some other fluid, you may be tempted to just run down to the local auto parts chain store. But before you waste your time and gas only to find high prices and...
    $11.38 - $88.22
  • ACDelco® GM Original Equipment™ Engine Crankshaft Position Sensor Connector
    (0 reviews)
    # sp11747
    GM Original Equipment™ Engine Crankshaft Position Sensor Connector by ACDelco®. Designed utilizing the latest technology, this Engine Crankshaft Position Sensor by ACDelco features premium quality and will perform better than...
    $17.76 - $88.92
  • Victor Reinz® Crankshaft Seal Retainer Gasket
    (0 reviews)
    # sp5668
    Crankshaft Seal Retainer Gasket by Victor Reinz®. When you’re low on oil, coolant or some other fluid, you may be tempted to just run down to the local auto parts chain store. But before you waste your time and gas only to find...
    $8.39


Featured Brands

Bearing journals are machined on the crankshaft so it can be supported in the cylinder block and to attach the big ends of the connecting rods to the crank throws. The crankshaft rotates in the block on plain bearings supported by a thin film of pressurized oil, and the rods are supported in the same manner on the crank throw rod journals. Most crankshafts have counterweights to offset the mass of the piston and rod assemblies and maintain engine balance.

A flywheel is mounted at the rear end of the crankshaft to smooth power flow, and provide a mounting surface for the clutch assembly. On vehicles with automatic transmission a flexplate is used in place of the flywheel to which the torque converter is attached. Both flywheels and flexplates have teeth around their circumference where the starter drive engages. A vibration damper, also called a harmonic balancer, is mounted on the front of the crankshaft to dampen the torsional distortion created in the crankshaft during engine operation. Accessory drive pulleys are usually attached to the vibration damper.

Crankshafts are stout, precision made components that with normal vehicle maintenance and use, should last the life of the vehicle. However, lax maintenance can result in dirt getting between the crank journals and bearings, or reduced oil flow, either of which can result in scored journals, increased clearance, metal-to-metal contact and engine knock. In such cases, the most economical repair with the least vehicle down time can usually be achieved with a crank kit, which includes a fully machined crankshaft and replacement bearings.

Oil leaks at the rear main seal are another common crankshaft malady. We have replacement seals and seal kits for all popular vehicles, but in cases of extreme wear the crankshaft seal contact surface can become grooved, making a replacement seal ineffective. However, there’s no need to completely replace the crankshaft if the sealing surface is marred. On our digital shelves you’ll find easy to install repair sleeves that are a press fit onto the crankshaft, creating a smooth surface for effective sealing and oil control.

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Guides & Articles

  • Auto Repair Parts
    This article will guide you through a generic tune up on most any car or light duty gasoline-powered vehicle built within the last 20 years or so. We will presume that you are tuning up your engine because it has reached the mileage or time point to do so, and that you are NOT performing a tune up to cure an engine performance defect. We make this distinction because not all running/performance issues will be solved via a simple tune up.
  • Auto Repair Parts
    Internal combustion engines are extremely complex and feature a wide array of components that rotate, move up and down, pump, seal, or remain stationary. When repairing or rebuilding your engine, you will come across many different terms when referencing repair manuals and ordering parts. We know it can be confusing, especially when the repair is complex. Even if you are paying a professional to do the work, it’s good to be conversant with the topic. In order to help you understand the terminology of engine components, we’ve created the following glossary, listed in alphabetical order.

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Crankshafts Reviews

Average rating:  4.5  4.7 - 8 reviews
Read All Crankshafts Reviews
4.8 of 5
Forged Crankshaft
The crank is good but the journals where undersized. I Had some problems installing Bearings, but it fitted perfect after all. I recommend to measure rod journals before ordering bearings.
JPosted by Joseph (Henderson, NV) /
2012 Ford F-150
Was this review helpful for you? Yes
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