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Mitsubishi Mirage Serpentine Belt Replacement Guide
How to change the serpentine accessory belt on the 1.2L engine in a 6th generation 2012 to 2016 Mitsubishi Mirage.

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2015 Mirage 1.2L Engine
Left Side - Belt & Pulleys
Alternator Pulley
This automotive maintenance tutorial was specifically written to assist owners of the sixth generation (2012, 2013, 2014, 2015, & 2016) Mitsubishi Mirage in changing the serpentine accessory belt on the 1.2 liter three cylinder 3A92 DOHC MIVEC 12V engine.

Owners of other Mitsubishi vehicles such as the Lancer, Outlander, Galant, Montero, Eclipse, 3000GT, Endeavor, Raider, Diamante, Attrage, Carisma, Colt, Grandis, Magna, Pajero, Space Star and the revised 2017 Mirage may also find these DIY instructions to be helpful.

The OEM replacement part number is Mitsubishi 1340A146.

A new belt can be purchased at Amazon or at your local Mitsubishi dealership's parts counter.

The tools needed to complete this procedure include a 12mm socket, a 14mm socket and a 3/8" drive ratchet.

Crankshaft Pulley
Mitsubishi-Mirage-Engine-Serpentine-Belt-Replacement-Guide-005 Mitsubishi-Mirage-Engine-Serpentine-Belt-Replacement-Guide-006
Study Belt Routing
The first two steps are to open the hood and then move to the left (passenger) side of the engine bay.

Take a moment to study how the OEM belt is routed around the various pulleys such as the alternator, water pump, air conditioning compressor pulley and the crankshaft pulley.

If you feel that you will have trouble installing the new belt correctly, draw a routing diagram or use the pictures on this page as a reference.

Mitsubishi-Mirage-Engine-Serpentine-Belt-Replacement-Guide-007 Mitsubishi-Mirage-Engine-Serpentine-Belt-Replacement-Guide-008
Belt Tension Bracket
Loosen Top Alternator Bolt
To release the tension on the old belt, you will have to loosen the two bolts that secure the alternator in place and the long tension adjustment bolt at the front of the alternator.

Use a 12mm socket and a 3/8" drive ratcheting wrench to loosen the top alternator bolt in the counterclockwise direction a few turns. The top bolt is mounted with the bolt head on the left side of the car. Do not remove the bolt.

Loosen Tensioner Bolt
Two 12mm Bolts
Bottom Alternator Bolt
To help remember the tension adjust bolt's OEM position, I'd recommend using a Sharpie marker to draw a line on the bolt where it meets the alternator mounting bracket.

Loosen the belt tension adjustment bolt (the long bolt with the head facing towards the front of the car) by turning it counterclockwise with the 12mm socket and a 3/8" drive ratchet.

Then locate the larger bolt on the bottom of the alternator. On this 2015 Mirage the bolt was covered with some blue paint.

14mm Socket & Ratchet
Loosen Counterclockwise
Lower 14mm Alternator Bolt
Loosen the bottom alternator bolt by turning it counterclockwise with a 14mm socket and the 3/8" drive ratcheting wrench a few turns. Do not remove the bolt.
14mm Bolt Loosened
Alternator Bracket Loose
Pivot Back Alternator
Firmly push on the alternator to pivot it back towards the rear of the engine to release the tension on the OEM belt.


Slip Old Belt Off Pulley
Remove Old Belt
Old Belt Removed
Slip the old belt off the top of the alternator pulley.

If you have trouble removing the old belt, loosen the tension adjustment bolt a few more turns and firmly push back the alternator to create more slack.

Pull the old belt off the other pulleys and remove it from the engine bay.

Inspect For Cracks
Lower In New Belt
Route Over Pulleys
Inspect the old belt for cracks, chunks of missing rubber and fraying.

If the old belt is in relatively good condition, consider saving it in your trunk for emergency use just in case the new belt fails prematurely.

Lower the new Mitsubishi 1340A146 OEM serpentine belt down on to the left (passenger) side of the engine.

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

Crankshaft Pulley
Slip New Belt Over Alternator
Pull Alternator Forward
Start by wrapping the new belt around the large crankshaft pulley at the bottom of the engine.

Slip the top of the belt over the alternator pulley.

Firmly pull the alternator forward until it pivots and applies some tension to the new belt.

Tension Adjustment Bolt
Slightly Tighten Lower Bolt
Tighten Tensioner Bolt
Spin in the tension adjustment bolt in the clockwise direction until it approaches the mark you drew on it earlier.

Slightly tighten the bottom 14mm alternator bolt in the clockwise direction. (Do not tighten it all the way.)

Tighten the long 12mm tension adjustment bolt until the belt seems to be tight enough.

Tighten Top Alternator Bolt
Tighten Lower 14mm Bolt
14mm Bolt Tight
Tighten the top 12mm alternator bolt in the clockwise direction until it is snug.

Then tighten the lower 14mm bolt until it is snug.

Double check that the two alternator bolts are tight before moving on to the next steps.

New Belt Installed
Check Belt Tension
Start Engine - Listen
To check the tension on the new belt, try to rotate the longest run from the alternator to the crankshaft pulley.

The proper tension should allow the middle of the belt to be turned about 90 degrees or perpendicular to the rest of the belt.

If you can not rotate the middle of the longest run of the belt to 90 degrees, loosen the tension adjustment bolt a few turns.

If the belt can be turned significantly past 90 degrees, it should be tightened.

To loosen or tighten the new belt, start by loosening the two alternator bolts (top 12mm and bottom 14mm) a few turns. Then either rotate the tension adjust bolt clockwise to tighten or counterclockwise to loosen.

Once you are satisfied that the belt tension is correct, start the engine and listen for any strange sounds.

If you hear an occasional "chirp" noise, you may need to tighten the belt.

If you hear a very loud and constant squealing sound, immediately turn off the engine. The belt might be far too tight to actually spin around the pulleys. Loosen the belt a bit and try again.

For more, check out all of my 2012-2016 Mitsubishi Mirage DIY Repair & Maintenance Guides.

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