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Toyota Tacoma Serpentine Accessory Belt Replacement Guide
How to change the serpentine accessory drive belt on the 1GR-FE 4.0L V6 engine in a 2005 to 2015 Toyota Tacoma.

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Paul B. Michaels
Author & Photographer
Auto Mechanic Since 1989

2013 Tacoma 4.0L V6
Serpentine Accessory Belt
Under Engine Skid Plate
This automotive maintenance DIY tutorial was specifically written to assist owners of the second generation (2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014 or 2015) Toyota Tacoma pickup truck in changing the serpentine accessory drive belt on the 1GR-FE 4.0 liter V6 motor.

Owners of other Toyota, Lexus or Scion vehicles such as the Yaris, Matrix, Prius, Camry, Corolla, Sienna, RAV4, Tundra, FJ Cruiser, Venza, Highlander, Avalon, Sequoia, Hilux, Land Cruiser, IS 250, ES 350, GS 350, tC, xB, xD, iQ and FR-S may also find these DIY instructions to be helpful.

A few compatible replacement belts with their part numbers are as follows: Continental Elite 4070834, Bando # 7PK2120, Dayco 5070835 and Gates K070834 Multi V-Groove.

The tools needed to complete this procedure include a 10mm socket, 12mm socket, 14mm socket and 1/4" drive, 3/8" drive and/or 1/2" drive ratchets.

Loosen 12mm Bolt
2nd Front 12mm Bolt
Rear 12mm Bolts
If the truck has been driven recently, I'd recommend allowing it to cool for an hour or two.

Park the vehicle on a level surface, turn off the engine and engage the emergency / parking brake.

It would also be a good idea to chock the front wheels to prevent it from moving while you are replacing the belt.

The easiest way to access most of the pulleys and also release the belt tensioner is from below the engine.

Slide under the engine bay and locate the four bolts that hold the metal skid plate (A.K.A. splash shield or under engine cover) in place.

There is one bolt at each corner of the skid plate.

4th 12mm Bolt
Metal Hook - Front of Plate
Four 12mm Bolts Removed
Loosen the bolts by turning them counterclockwise with the 12mm socket and 3/8" drive ratcheting wrench.

Hold up the rear edge of the skid plate with one hand while you remove the two back bolts.

Set the four bolts aside in a safe place.

Lift the front edge of the skid plate and slide it forward to disengage it from the metal hooks.

Metal Cover Removed
View of Pulleys From Under
Crankshaft Pulley
Slide the under engine cover back towards the rear of the truck to get it out of the way.

I'd recommend you take a few moments to how the old serpentine belt is routed around the various pulleys including the crankshaft, A/C compressor, tensioner, water pump, alternator (generator), power steering pump, idler 1 and idler # 2.

A general tip to remember is that the ribbed side of the belt gets wrapped around ribbed pulleys and the smooth side of the pulley goes against smooth pulleys.

Power Steering Pump & Idler
Belt Routing Diagram
14mm On Tensioner Pulley
I included a picture of the accessory belt routing diagram for the 1GR-FE 4.0L V6 engine.

Locate the tensioner pulley just below and to the right of the water pump and just above and to the right of the large crankshaft pulley.

Attach a 14mm socket to a 3/8" or 1/2" drive ratcheting wrench.

If your tensioner is very firm, you may need a long "cheater" bar to place over the ratcheting wrench for more leverage.

Turn Counterclockwise
Pull Old Belt Off Pulleys
10mm Engine Cover Nuts
Rotate the wrench counterclockwise to move the tensioner arm to the left and release the tension from the old belt.

Hold the tensioner in the released position with one hand while slipping the old belt off the tensioner pulley and/or one of the other adjacent pulleys.

For better access to the top of the engine and some of the pulleys, remove the plastic engine cover.

Loosen Counterclockwise
Two 10mm Nuts
Lift Front of Engine Cover
Loosen the two nuts that hold the engine cover in place by turning them counterclockwise with a 10mm socket and 1/4" drive ratcheting wrench.

Set the two nuts aside in a safe place.

Lift the front edge of the engine cover and then slide it forward to disengage the two "C" shaped sockets on the rear edge from the mounting bar.

Pull Sockets Off Bar
Route Belt Around Fan
Old Belt Removed
Set the plastic engine cover aside in a safe place.

Pull the old belt off all of the pulleys.

Route the old belt in front of the fan and around the fan blades.

Inspect the old belt for cracks, rips, tears and fraying. If the old belt is in relatively good condition, you could save it in your garage or truck bed storage container for emergency use.

I recommend buying the Gates K070834 belt since it has excellent reviews on Amazon.


Lower In New Belt
Route New Belt Under Fan
Belt Routed Past Fan Blade
Check the three idler pulleys and make sure that they spin freely. If an idler pulley is difficult to turn, doesn't rotate evenly, wobbles or makes a squeaking noise, you should consider replacing it.

A few compatible idler pulleys with their part numbers are as follows: Gates 36174, ACDelco 36173, Toyota 16604-0P011, Febest 0188-2GRFE and Gates 36173. (Make sure you are buying the correct "upper" or "lower" idler pulley.)

If the tensioner assembly was very loose and it was easy to release the tension on the old belt, consider replacing it with a new one.

Here are a few compatible replacement tensioner assemblies with their part numbers: Gates 38411, ACDelco 38411 and Continental Elite 49416.

Lower the bottom part of the new belt down in front of the engine and around the fan blades.

Start Routing New Belt
Belt Over P/S Pump
Water Pump, Tensioner, A/C
Remember that the ribbed side of the belt goes around the ribbed pulleys and the smooth side of the belt goes against the flat pulleys.

Wrap the new belt around the power steering pump pulley, over the idler number two pulley, over the water pump, under the idler pulley, around the alternator, around the air conditioning system compressor pulley, over the lower idler and around the crankshaft pulley.

Loosen Tensioner - Slip Belt On
New Belt Installed
Double Check Routing
Hold the new belt taught near the tensioner pulley with one hand.

Rotate the tensioner pulley in the counterclockwise direction to move it towards the left until you can slip the end of the belt over the pulley.

Double check that you have routed the new belt the correct way over the pulleys.

2005-2015-Toyota-Tacoma-1GR-FE-Serpentine-Accessory-Belt-Replacement-Guide-034 2005-2015-Toyota-Tacoma-1GR-FE-Serpentine-Accessory-Belt-Replacement-Guide-035 2005-2015-Toyota-Tacoma-1GR-FE-Serpentine-Accessory-Belt-Replacement-Guide-036
Make sure that the grooves on the underside of the new belt are seated properly on each of the ribbed pulleys.

Check that the new belt is tight but loose enough to be turned about 90 degrees.

If the new belt seems loose or too tight, you may have routed it the wrong way around the pulleys or the tensioner arm assembly may need to be replaced.

Start the engine and listen carefully for any strange sounds that might indicate an improperly routed belt, a loose pulley, a seized pulley or a worn out pulley bearing.

Under Engine Cover
Line Up Skid Plate
Re-Attach Two Front Hooks
Slide the metal under engine cover forward and re-insert the metal hooks in to the square openings.
Spin In 12mm Bolts
2005-2015-Toyota-Tacoma-1GR-FE-Serpentine-Accessory-Belt-Replacement-Guide-041 2005-2015-Toyota-Tacoma-1GR-FE-Serpentine-Accessory-Belt-Replacement-Guide-042
Tighten Clockwise
Spin in the two rear 12mm bolts a few turns by hand to prevent them from becoming cross threaded.
3rd 12mm Bolt
4th 12mm Bolt
Under Engine Cover Secured
Tighten the four bolts by turning them clockwise with the 12mm socket and ratcheting wrench until they are snug.

Double check that the skid plate bolts are secure.

Line Up "C" Sockets & Bar
Spin On 10mm Nuts
Tighten Nuts Clockwise
Re-attach the "C" shaped sockets on the back side of the engine cover to the metal mounting bar.

Lower the front of the engine cover in to place.

Spin on the two 10mm nuts and tighten them in the clockwise direction until they are snug. Try to avoid over tightening the two nuts to prevent from cracking the plastic engine cover.

For more, check out my other 2005-2015 Toyota Tacoma DIY Repair & Maintenance Guides.

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