After replacing a timing belt on a 2006 mitsubishi galant, there is a whining noise at 1200 rpm. I've replaced the timing idler pulley, balance tensioner pulley, and the hydraulic tensioner pulley and now im stuck, for the noise still persists. what should i do?

It might be the idler pulley or automatic tensioner. When either one dries up, the bearing wears out and starts causing whistling or whining noises, might need replacing. Try replacing the cheapest one, the idler pulley to see if it stops. If not, it might be your belt tensioner.

I also need help knowing how to replace the belt tensioner pulley. It looks like you can't get out the bolt because the pulley is real close to the frame, unless the bolt has nuts on both ends, but it doesn't look like it.

Timing Belt Replace ment Intervals for 2006 Mitsubishi Galant are as follows:

2.4L 4Cylinder engine: Every 60,000 miles

3.8L V-6 Engine: Every 60,000 miles

Both of these engines are "Interference Engines" which means that if the timing belt breaks, severe engine damage is likely to result.

I personally recommend replacement of the timing belt idler and tensioner pullies as well as the water pump because failure of these components will cause a failure of the timing belt.

All Mitsubishi cars pretty much hide the water pump under the timing belt. You should buy all new belts for the car and consider replacing the water pump at the same time.You will have to take off the power steering belt, the alternator belt, the upper belt cover, support the motor, take off the motor mount, jack up the right front corner of the car, take off the front right tire, take off the engine plastic under cover, line up the TDC timing mark, Take off the front wheel ,take off the plastic splash cover, using an air wrench take off the lower pulleys, take off the lower engine cover, observe the timing marks/arrows and highlight with paint (on the crankshaft,counter balancer shaft , and cam shaft),take off the timing belt, counter balancer belt if there is one, water pump belt, and now you can unbolt the water pump, scrape the gasket, and replace it. Now the good news, if you have tools,a compressor, an air gun(for lower pulley bolt), patience , and four to eight hours to kill, you can actually do it your self.

Timing belt “B” (balancer belt) and related components—2004–2005 Galant and 2004–2005 Lancer 2.4L engine

1. Disconnect the negative battery cable. Remove the engine under cover.
   
2. Remove the crankshaft damper pulley.
   
3. Disconnect the control wiring harness connector, battery wiring harness connector and connector bracket to engine mounting insulator.
   
4. Remove the harness bracket. Remove the upper timing belt cover. Remove the water pump pulley. Remove the idler pulley.
   
5. Remove the auto tensioner. Remove the lower timing belt cover.
   
6. Turn the crankshaft clockwise and align each timing mark to set the number one piston to TDC of its compression stroke.
   
7. Remove the timing belt under cover rubber plug and then install special tool MD998738. Screw the special tool until it contacts the timing belt tensioner arm.
   
   NOTE The special tool must be screwed in gradually at the rate of a 30 degree turn per second. If it is screwed in all at once, the timing belt tensioner adjuster rod will not easily retract and the tool may bend.
   
   
8. Gradually screw in the special tool and then align the timing belt tensioner adjuster rod set hole “A” with the timing belt tensioner adjuster cylinder set hole “B”.
   
9. Insert a wire or pin in the set holes to lock the assembly in place. After removing the special tool, loosen the timing belt tensioner pulley mounting bolts and remove the timing belt. If the belt is being reused be sure to mark the direction of rotation (clockwise) on the belt.
   
10. Remove the timing belt tensioner pulley, tensioner arm and adjuster.
    
11. Remove the timing belt idler pulley. Remove the timing belt lower cover bracket. Remove the crankshaft position sensor.
    
12. Remove the crankshaft pulley center bolt and washer. Remove the drive sprocket. Remove the crankshaft angle sensing blade.
    
13. Remove the balancer timing belt tensioner. Remove the timing belt “B” (balancer belt) from its mounting.
    

Timing belt tensioner adjuster rod set hole “A” and cylinder set hole “B”—2004–2005 Galant and 2004–2005 Lancer 2.4L engine

To install:



Belt tension checking—2004–2005 Galant and 2004–2005 Lancer 2.4L engine



Cylinder block plug location—2004–2005 Galant and 2004–2005 Lancer 2.4L engine



Timing belt sprocket alignment—2002–2004–2005 Galant and 2004–2005 Lancer 2.4L engine

You sould replace the belt along with the timing belt. If it gets caught in the timing belt you will have MAJOR EGINE DAMAGE!

Should be on your 2nd timing belt. If you have the 4cyl engine there is a balance belt that needs to be changed also. Mitsubishi recomends replacement at every 60,000 miles, your 10k over. Most of the time these motors are not interferance engines, But I have seen a few that broke a belt at high rpm that did bent valves......

This Noise Description sounds Indicative of the Sounds that come from the Serpentine Belt Or Related parts such as Belt Idler Pulley or Belt Tentioner witch also has a Pulley, but if Tensioner itself is Literally BROKE I've replaced a number like this it will cause a Whining noise . Best case scenario its just the Belt, and if any of the other Problems turn out to be the Culprit the Belt MUST be Replaced Anyhow as Damage is Being caused By the Very Whining you hear.
PLEASE Spend the Extras $ for the BEST BELT as this Drives your Water pump, Alternator, A/C Compressor, Power Steering Pump All Crucial to Control of, easy Steering ,All Electrical-Power Distribution, The COOLING of Engine << VERY CRITICAL Component
The Pulleys usually have a more Hum type Whining. So I would say at Best The BELT , And WORST Belt Tentioner is Broke

Co2 Sensor

It is the idler pulley. Change it before it seizes and snaps the serpentine belt. It should be a relatively inexpensive repair.