Engine diagram optra

not much information here to get an answer
on an engine there can be more than 5 pulleys
The main pulley that is ;likely to fail is the harmonic balancer located on the crankshaft and has a rubber insert in it
so if it is that pulley it is at the bottom of the engine , that will be it

Check your timing belt, even if your only symptom is loud lifter noise on startup. The belt/pulleys are not designed with deep V grooves and the tensioner is manual, not spring loaded. If the crankshafts stops at a certain point and creates any slack in the belt to the top right lifter pulley, that pulley, under tension from the spring loaded valves, tends to jump a notch. The only solution, after refixing the timing belt correctly (make sure you know how to do this) appears to be careful over-tightening of the manual tensioner and prayer! Bad design.

flashing is a severe condition, most cases it is from random multiple misfires, i would get it checked soon.

google firing order diagram for 2004 chevy optra

Pop the hood of the car and locate the serpentine belt routing diagram. The diagram on the 2003 Chevrolet Impala is on top of the fan shroud. The diagram will be a picture of all of the accessory pulleys and how the serpentine belt is routed among the pulleys. This diagram will give you the exact direction for routing the new belt onto the pulleys. If you cannot find a serpentine belt routing diagram, take a notepad and pen and draw out the exact routing diagram of the old belt across the pulleys.

2 Locate the serpentine belt tensioner. It is located below the alternator on the left front side of the engine. The tensioner on the 3.4 liter, 3.5 liter and the 3.9 liter engines will require a 3/8 ratchet to release the belt tensioner. The 3.8 liter engine will require a ratchet and a 15 mm socket for the belt tensioner. Rotate the belt tensioner clockwise to loosen and remove the belt from the belt tensioner pulley.

3 Slide the old belt from the belt tensioner pulley. Remove the belt from the remaining pulleys and pull the belt from the engine compartment.

4 Route the new belt across the crankshaft pulley first. The crankshaft pulley is the big pulley on the bottom of the engine in the center. Then route the serpentine belt across the remaining pulleys as directed by the serpentine belt routing diagram. Leave the belt tensioner pulley for last.

5 Rotate the belt tensioner clockwise again to relieve the tension and slide the new belt across the top of the belt tensioner pulley. Release the belt tensioner and the belt will tighten up as the tensioner applies pressure to the belt. Make sure the new belt is properly seated in all the pulleys.

6 Crank the engine and inspect the belt again to make sure that it stays seated in the pulleys.

Read more: How to Replace a Serpentine Belt on a 2003 Chevrolet Impala ' eHow.co.uk http://www.ehow.co.uk/how_6120665_replace-belt-2003-chevrolet-impala.html#ixzz1Yi6QLAjb

2005 Chevrolet Optra has four available engines: 1.4L (DOHC), 1.6L (L91), 1.8L (L79) and 2.0L (L34 GMDAT).

If you would like a belt routing diagram, it would be helpful if you would mention which of these engines your Optra is equipped with.

1. 1 Check to ensure the Sienna's engine is cold, then make sure the Sienna is in park, the ignition is in the off position and the key is removed from the ignition to prevent any possibility of the engine engaging during the serpentine belt replacement.
   
2. 2 Open the hood and locate the serpentine belt routing diagram sticker on the side of the engine casing. Study it for a moment before removing the existing belt. It is essential the new belt be installed exactly as the diagram indicates.
   
3. 3 Find the tensioner pulley, the main pulley that controls the serpentine belt, and fit a 1/2-inch socket wrench over the self-tensioner on the outside of the pulley.
   
4. 4 Pull the wrench to the left to move the pulley forward, which loosens the belt, then remove the belt.
   
5. 5 Compare the old serpentine belt with the new, replacement belt for length, width and number of grooves on the belt's underside. Be certain the replacement belt is the right part.
   
6. 6 Fit the new belt on to each pulley according to the serpentine belt routing diagram on the manufacturer's sticker, or according to the drawing made prior to removing the old belt. Fit the new belt on to the tensioner pulley last, again applying pressure on the pulley's self-tensioner with the half-inch socket wrench to loosen the pulley.
   
7. 7 Release the pressure on the self tensioner and allow the tensioner pulley to ease back into place, thereby tightening the new serpentine belt with the appropriate tension.
   
8. 8 Remove the wrench and close the hood.
   

Thank you and good luck,
Lee

Not sure what engine you have so here is both.


Item Part Number Description 1 10346 Generator 2 6B209 Drive Belt Tensioner 3 3A674 Power Steering Pump 4 19703 A/C Compressor 5 6A312 Crankshaft Pulley 6 6C348 Idler Pulley 7 8501 Water Pump 8 8620 Drive Belt




Item Part Number Description 1 10346 Generator 2 3A674 Power Steering Pump 3 19703 A/C Compressor 4 6C348 Idler Pulley 5 6B321 Crankshaft Vibration Damper and Pulley 6 8501 Water Pump 7 6B209 Drive Belt Tensioner 8 8620 Drive Belt

there should be a routing pic on the car in the engine compartment somewhere.

How to remove the serpentine belt on a 2004 optra 2.0L:
I did this yesterday in my driveway, and it is quite easy if you are handy, you don't need to be a mechanic.
What you need: A 15mm wrench, a 10mm socket, a new serpentine belt, a flathead screwdriver.
You must draw yourself a diagram of the belts and pulleys before you remove anything. Once you remove the belt, you have to put it back the same way so a diagram always helps.

1. Remove your air filter housing by removing the 10mm bolt located at the back of the air filter housing, and pull the housing upward with some force.
2. Loosen the clamp that is holding the air filter housing to the air hose. Remove the hose.
3. Place your air filter housing aside so it is not in the way. Retrieve a 15mm wrench (socket wrench will not fit). The longer the wrench the better. If you have a short wrench, you will probably need a pipe that fits around your wrench, or another wrench to use as leverage to gain more strength.
4. Place your 15mm wrench on the belt tensioner. On the Optra, the tensioner is the middle pulley (probably the smallest), and place your pipe or other wrench as leverage on top of your 15mm wrench.
5. Turn the 15mm wrench Clockwise as if tightening the bolt. The bolt will be difficult to turn, but even freeing it a little but loosens the tension, and you can pull your belt off of the top pulley.
6. Once you take your belt off of the top pulley, you can slowly release your grip of the 15mm bolt, careful not to injure yourself as it is spring loaded, therefore it has high tension and will try to swing back into place if you just let go, you have to let it roll back in a controlled manor.
7. After you let the tensioner roll back into place, remove the wrench and remove the rest of the belt.
8. Compare your new belt to your old belt, making sure that they are the same. There are two types of serpentine belts for your Optra, one that is "factory installed A/C" and another that is "dealer installed A/C". If your parts supplier has both in stock and you are not sure, get both and return the wrong one later to save you time.
9. Put the new belt on, starting at the lower pulleys, then move your way towards the upper pulleys. Leave the top left pulley for last. After the belt is on all the other pulleys, place your 15mm wrench back on the tensioner and release the tension by pulling it clockwise. Place the last part of the belt on the upper left pulley. Release the tensioner slowly.
10. Make sure the belt ribs are on all the pulleys evenly and correctly, so that your belt doesn't slip off of the pulleys when you start up the car.
11. Put the air filter housing back on, bolt it with the 10mm bolt, and attach your air hose and tigten the clamp. Check the belt one last time making sure it has tension, and is set correctly on all the pulleys.
12. Fire up your Optra and listen to it purr. If everything is ok, you did a good job!

Please post this on other sites to help people, as finding help for servicing 2004 Chevrolet Optra's is difficult!