How to Replace a Serpentine Belt


how to replace a serpentine belt

Disclosure: we may earn a small commission from the companies mentioned in this post via affiliate links to products. This doesn't make any additional cost to you. All products are selected independently.

A serpentine belt is one of the key elements providing your motor’s steady functioning. And we are going to provide you with all the necessary information about its examination plus substitution. A serpentine also referred as s-belt, deals with a simplification of pumps plus sheaves operation under the hood.

Actually, this long belt deals with any motor-driven detail, comprising water pump, alternator, a/c compressor plus power steering pump.

As so many motor’s internal parts heavily depend on it, it’s crucial to examine your s-belt periodically for possible weariness, cracking or glazing. Basically, a serpentine belt must be substituted after every 30,000-60,000 miles are run. In order to make this process easier for you, we are offering a detailed guide on inspection and substitution of this belt.

Serpentine belt change guide

Tools needed:

General Rules of S-Belt Replacement

Experienced drivers who used to substitute fan belts may recall how traumatic and energy-consuming process it was. Moreover, as a rule, it was necessary to substitute two or even three belts.

Today, contemporary automobiles employ one wider, multi rifled serpentine belt in lieu of the ones for each internal detail. A curious fact: the belt got its name for the manner it snakes around various sheaves.

Serp belt substitution is pretty easy due to contemporary automatical drive belt tensioners eliminating the necessity of loosening bolts or prying elements into disposition for retensioning. Just revolve the tensioner, take off the old belt and mount a fresh one. The tensioner can be released after belt ribs take their positions into the sheave grooves.

Step-by-Step Instructions

Step 1: To reach the motor’s front part, move away from motor covers plus shrouds or plastic guards which may prevent you from seeing the work area well. Having opened the automobile’s hood, you will get access to the serp belt.

Step 2: Deactivate the battery. Actually, the battery must be always deactivated before any serious operations within an automobile. Applying a wrench or socket of the proper size, weaken the nut carrying a black grounding cable on the negative battery terminal.

  • Slip the cable off from the terminal and thrust it to the batteries’ side.
  • The positive terminal may stay connected.

Step 3: Localize the belt tensioner situated under spring tension to keep the pressure on the belt that protects it. Contingent from your automobile’s motor, the s-belt may be situated in the front part of motor or may go along its side. If there are any motor covers on a way, move them away.

Step 4: Localize the serpentine belt routing diagram. Many automobiles are supplied with a sticker in the motor bay demonstrating how the s-belt is expected to pass through different motor’s sheaves. If your automobile has no sticker, you will have to memorize the belt’s routes.

  • Consult the owner’s manual for your automobile model to create a diagram.
  • Another way is to take a photo of how the existing belt is placed and follow the scheme while installing a fresh one.

Step 5. Loosen the tensioner employing a wrench. Just push it on the opposite side of the spring tension. Contingent from employment, your s-belt may have a tensioner established on it by a mobile bracket or an auto tensioner sheave, using internal spring for employment of persistent pressure to the belt.

  • If your automobile features no tensioner sheave, tension is set on the belt by an alternator bracket.
  • If you have any doubts, consult your automobile’s service manual to find out what tensioner it keeps.

Auto tensioners feature a port for a ½ inch drive ratchet or a bolt you are free to utilize a socket for. Inset a wrench or set a socket over the bolt on the tensioner. Twirl it away from the belt to loosen the tension.

Step 6: After the tensioner is weakened, pull the belt off the nearest sheave. If your automobile is equipped with an alternator bracket, loosen two bolts passing through long bracket’s slots. After that, the belt’s pressure will most probably shift the alternator to motor, relieving the pressure.

Step 7: Now, feel free to take off the belt. Remove it from the bottom sheave plus all idler sheaves plus accessories.

Step 8: Make sure that a fresh belt looks similar to the old one. They must have the same width as well as identical number of ribs, covering the belt horizontally. Note that the old belt may be a bit longer as it stretches a bit after being utilized for a long time.

  • If the belts have different width, don’t install the new one as it’s wrong.
  • Make certain that a fresh belt has no damages or flaws. Otherwise, it may tear soon after its installation.

Step 9: Having examined the fresh belt, mount it onto the sheaves.

  • The s-belt must be long enough to cover all the sheaves excluding the tensioner until you revive its pressure.
  • In case the belt lies too loosely, it signifies that you have a wrong size belt. The other reason for that is that you have placed it incorrectly.

Step 10: After placing the belt on the motor sheaves, activate the tensioner for the belt mounting finalization.

Step 11: Having revived pressure on the auto tensioner, place the belt over it. Employ the same wrench to weaken the auto-tensioner sheave, then drag the belt over it. As soon as the belt is set, release the tensioner’s pressure for holding the belt in its place. If your automobile features no auto tensioner, input a pry bar or a piece of wood betwixt alternator and motor.

Place the belt over alternator sheave. Employing a bar, extract alternator from motor and then, release pressure on the belt. Clench bolts one more time after applying tension.

Step 12: Having finished the belt installation, take a flashlight to check if the belt placement on the sheaves aligns with the belts’ riffles.

Serpentine Belt Replacement Tips

  • Belt sheave grooves are cleaned better by wire brushes.
  • Always employ the belt of the correct size for maintenance of the normal tension level.
  • Avoid applying “belt dressing” or anti noise sprays. Though they can be a temporary solution of the problem, they may cause belt failure due to the contaminated sheave system.
  • When you remove the belt, twirl the sheaves to make certain that bearings are reliable. If bearings fail, they shriek before locking up and throwing the belt off.

A serpentine belt ensures steady functioning of air conditioner compressor, power steering pump plus alternator. It may fail or crack after being utilized for some time, and that leads to some systems failure. Steering will become complicated due to the car battery’s diminished charge caused by non-operational power assist. Though belt placing is quite a complicated task, you will easily cope with it by drawing a diagram or making a photo.

Best serpentine belts for the money

No. 1
Gates 90K-38172 Complete Serpentine Belt Drive Component Kit
37 Reviews
Gates 90K-38172 Complete Serpentine Belt Drive Component Kit
  • complete serpentine kits make it easy to service the entire serpentine belt drive system
  • our complete serpentine kits provide customers a time-saving convenient way to purchase all the premium parts needed in one pre-packaged kit to completely restore their serpentine belt drive system
  • components of the complete serpentine kit are sealed and packed securely to maintain outstanding quality and condition during shipping
  • package weight: 6.03 pounds
  • Fit type: Vehicle Specific
No. 2
Continental 4070750 OE Technology Series Multi-V Belt
31 Reviews
Continental 4070750 OE Technology Series Multi-V Belt
  • 7-rib, 75.0" Multi-V / Serpentine belt
  • Straight-ribbed construction widely recognized by professional repair technicians
  • New construction and compounding improves durability for a longer lasting, quieter ride
  • The aftermarket multi-v belt that's precision engineered for perfect fit, form and function with a true OE pedigree
  • Continental Elite Poly-V belts are transitioning to a familiar straight-ribbed design - OE Technology Series - that matches the OE style belt
SaleNo. 3
ACDelco Professional 6K950 Standard V-Ribbed Serpentine Belt
182 Reviews
ACDelco Professional 6K950 Standard V-Ribbed Serpentine Belt
  • Made with temperature and crack resistant EPDM rubber for a long life and quiet, dependable performance
  • Is the belt of choice by professional technicians, lasting 50% to 60% longer than retail belts (low priced belts sold at car part stores)
  • Its precision dimension control of rib profile transmits load efficiently throughout the accessory belt drive systems (ABDS) allowing components to operate at optimum levels
  • Able to operate and accept misalignment in the accessory belt drive systems (ABDS) far greater than other serpentine belts
  • Its flexible construction allows the belt to withstand billions of topside and backside bends resulting in a long belt life
SaleNo. 4
MICHELIN Serpentine Drive Belt SMAMV7PK1780
16 Reviews
MICHELIN Serpentine Drive Belt SMAMV7PK1780
  • Optimize Costs and Reduce CO2 Emissions - Our serpentine drive belts are high-performance components able to withstand difficult engine environments with high speed, high temperatures, and wet conditions, making them especially durable and wear-resistant. Increased flexibility and reduced weight optimize costs and reduce CO2 emissions.
  • Built-In Tension and Product Warranty - MICHELIN belts are available with polyamide cord, which allows the belt to automatically maintain the right belt tension over time. This provides compact, low-noise drive solutions with low maintenance and higher cost-effectiveness. Also includes a one-year product warranty for defects in material and workmanship under normal use and service.
  • This product is designed to fit specific vehicles per the OEM design and requirements.  Please confirm with your vehicles owner’s manual or OEM specification to ensure correct part specification before purchasing this component.  Note that engine size, accessory options and other options can impact the product size and design.  If further assistance is needed contact the seller directly for additional product information and availability.
  • Replaces 5070700, 7PK1780, K070700 OE part numbers.
  • 7 Ribs 70.1 In.x0.96 In. - 1780 mmx24.384 mm
SaleNo. 5
Motorcraft JK6455C Serpentine V-Belt
97 Reviews
Motorcraft JK6455C Serpentine V-Belt
  • Purchase Price is 1 Each
  • Country of Origin: China
  • Part number: JK6455C
  • Fit type: Vehicle Specific
No. 6
Goodyear Belts 1070763 Serpentine Belt, 7-Rib, 76.3" Length
  • Meets or Exceeds OEM Specifications; Long-life EPDM Rubber Compound
  • Proprietary rubber formulation for quiet operation
  • Synthetic tension members with balanced twist cord ensures neutral tracking when running
  • AutoCare Association recommends inspecting belts at 60,000 miles and replacing at 90,000 miles
  • Length: 76.3 inch or 1938 mm; Alternate Part Number 7PK1938
SaleNo. 7
Gates K060876 Micro-V Serpentine Drive Belt
24 Reviews
Gates K060876 Micro-V Serpentine Drive Belt
  • EPDM rubber constructions resist cracking on the rib surface
  • Package Dimensions: 2.286 H x 33.528 L x 9.144 W (centimetres)
  • Package Weight: 0.45 pounds
  • Country of Origin : China
SaleNo. 8
Gates K081264HD Serpentine Belt/Fan Belt
596 Reviews
Gates K081264HD Serpentine Belt/Fan Belt
  • Patented material provides peak performance at prolonged extreme operating temperatures
  • Heavy-duty construction resists cracking and wear, even at extreme temperatures
  • Special compound provides unmatched flexibility, stability, load carrying capacity and belt life
  • Problem solver designed for the toughest applications
  • Consistently outperforms other heavy-duty serpentine belts on the market
No. 9
Gates 90K-38284A Complete Serpentine Belt Drive Component Kit
2 Reviews
Gates 90K-38284A Complete Serpentine Belt Drive Component Kit
  • gates complete serpentine kits make it easy to service the entire serpentine belt drive system
  • our complete serpentine kits provide customers a time-saving convenient way to purchase all the premium parts needed in one pre-packaged kit to completely restore their serpentine belt drive system
  • components of the gates complete serpentine kit are sealed and packed securely to maintain outstanding quality and condition during shipping
  • package dimensions: 14.3 l x 26.2h x23.8wcentimeters
  • Fit type: Vehicle Specific
SaleNo. 10
ACDelco Professional 7K443 Standard V-Ribbed Serpentine Belt
50 Reviews
ACDelco Professional 7K443 Standard V-Ribbed Serpentine Belt
  • Professional, premium aftermarket replacement
  • Provides the performance and dependability you expect from ACDelco
  • Manufactured to meet expectations for fit, form, and function
No. 11
Dayco 5060890 Serpentine Belt , Black
40 Reviews
Dayco 5060890 Serpentine Belt , Black
  • Package length:38.1 cm
  • Package width:9.652 cm
  • Package height:1.524 cm
  • Product Type:AUTO PART
No. 12
ACDelco Professional 7K822 Standard V-Ribbed Serpentine Belt, Black
68 Reviews
ACDelco Professional 7K822 Standard V-Ribbed Serpentine Belt, Black
  • Made with temperature and crack resistant EPDM rubber for a long life and quiet, dependable performance
  • Is the belt of choice by professional technicians, lasting 50% to 60% longer than retail belts (low priced belts sold at car part stores)
  • Its precision dimension control of rib profile transmits load efficiently throughout the accessory belt drive systems (ABDS) allowing components to operate at optimum levels
  • Able to operate and accept misalignment in the accessory belt drive systems (ABDS) far greater than other serpentine belts
  • Its flexible construction allows the belt to withstand billions of topside and backside bends resulting in a long belt life
SaleNo. 13
Continental 4061015 OE Technology Series Multi-V Belt
111 Reviews
Continental 4061015 OE Technology Series Multi-V Belt
  • 6-rib, 101.5" Multi-V / Serpentine belt
  • Straight-ribbed construction widely recognized by professional repair technicians
  • New construction and compounding improves durability for a longer lasting, quieter ride
  • The aftermarket multi-v belt that's precision engineered for perfect fit, form and function with a true OE pedigree
  • Continental is the OE supplier on millions of domestic and import vehicles
SaleNo. 14
Continental OE Technology Series 4070722 7-Rib, 72.2' Multi-V Belt
58 Reviews
Continental OE Technology Series 4070722 7-Rib, 72.2" Multi-V Belt
  • 7-rib, 72.2" Multi-V / Serpentine belt
  • Straight-ribbed construction widely recognized by professional repair technicians
  • New construction and compounding improves durability for a longer lasting, quieter ride
  • The aftermarket multi-v belt that's precision engineered for perfect fit, form and function with a true OE pedigree
  • Continental is the OE supplier on millions of domestic and import vehicles
No. 15
Continental Elite 4050400 OE Technology Series 5-Rib, 40.0' Multi-V Belt
16 Reviews
Continental Elite 4050400 OE Technology Series 5-Rib, 40.0" Multi-V Belt
  • 5-rib, 40.0" Multi-V / Serpentine belt
  • Straight-ribbed construction widely recognized by professional repair technicians
  • New construction and compounding improves durability for a longer lasting, quieter ride
  • The aftermarket multi-v belt that's precision engineered for perfect fit, form and function with a true OE pedigree
  • Continental Elite Poly-V belts are transitioning to a familiar straight-ribbed design - OE Technology Series - that matches the OE style belt

Last update on 2021-10-18 / Affiliate links / Images from Amazon Product Advertising API

Dan Hoffman

Dan is a co-founder of Engineswork. He knows everything about internal combustion engines. Ask your questions in comments down below this article - he will be glad to help you anytime.

Leave a Reply

Your email address will not be published. Required fields are marked *

Recent Posts