Question about 1999 GMC Sonoma

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Timing belt warn or timing chain warn

Does it have timing belt or chain

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  • Rick Byrd
    Rick Byrd May 11, 2010

    please specify engine size ?

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  • 66 Answers

The 4.3l is a chain

Posted on Jan 24, 2009

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Carburator problems


I suggest you check your timing chain, or belt for warn. timing belt jump usually diagnoses that behaviour

Jul 20, 2014 | 2005 Mazda 3

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When should I change the timing belt on my car?


The philosophy "if ain't broke do not fix", doesn't work for the timing belt. If it broke, then can bend valves and put a hole in the piston. Normally the engine repair cost much more than a timing belt change. Worn timing chain/belt can cause engine to run rough, decrease the power, and fuel mileage, and even worse, the engine refuses to run at all. It is difficult to check the wear on a timing belt, because access difficulties, so plan to change the belt at recommended intervals. As a rule, most OEM recommend replacing OHC rubber timing belts at 60Kmiles, but there are exceptions. Porsche, Volvo recommends belt replacement at 50K up to 100K depending on engine models. Acura, Audi and Chrysler allow 90K between belt changes. Ford, Mercury and Toyota up to 100K, but not for all engines. Changes in belt materials have improved belt durability to 100K, where "long life" materials are used, as "highly-saturated-nitrile" (HSN).
Timing chains usually gives some warning signs before they fail (but not with belts). Noise from inside the timing chain cover indicates that it is overstretched. You can check the status of a timing chain by removing the distributor cap and turn the crank shaft pulley in one direction (VERY SLOWLY) until distributor rotor moves, mark with a chalk crank shaft pulley to engine. Now turn it in the opposite direction (VERY SLOWLY) until the distributor rotor starts to move the other way. If the crank pulley has to be turned more than half an inch to move rotor, the timing chain and sprockets, are worn up, and have to be replaced.
While changing the timing chain/belt, it is easily accessible for other jobs, such a water pump replacement, so it is a good idea to replace other belts, and the water pump. Make sure to send your car to professionals. It is not rare for people to have problems with engine after replacing the timing belt. In all my cars I do it by myself. It is not impossible, but you will spend more time than a professional. If you decide to do it by yourself, then get the Haynes Repair Manual (Based on a complete tear down and rebuilt), specific for your car. Go to the part Engine, and use the chapter Timing belt removal inspection, and Top Dead Center (TDC) location, and put the number one piston at TDC on the compression stroke. This can be found by putting the thumb over the spark plug hole and the pressure will push your finger upward till piston reaches the upper point. This can be done by inserting a long blunt object into the spark plug hole. Note the point where the object stops moving out this is the TDC.
YOU MUST ALIGN TIMING MARKS BEFORE REMOVING TIMING BELT.


on Oct 20, 2010 | Chrysler Sebring Cars & Trucks

2 Answers

My aunt has a 97 nissan pick up she said the engine light is on and the belts are noisy. do u think that a nissan with 87000 on it would have a problem with the timing belt or just needs new plugs?


The check engine light is warning the driver the computer has found a problem that will affect engine performance or emissions. The light would not come on for a problem with the timing belt or accessory belts.
87,000 miles is around the time most companies recommend replacing the timing belt.
You would need to have the computer scanned for trouble codes to proceed with troubleshooting the problem or problems.

Jan 21, 2013 | 1997 Nissan Pickup

2 Answers

How often does the timing belt need replacing?


Both timing belt and chain can wear out. A loose timing chain can result in poor running, valve clatter, and loss of power, while a broken timing belt can cause your engine to stop running or, on an interference application, cause your valves to crash into your pistons.
Timing belts fail without warning and on some vehicles, are almost as hard to check as they are to change. In most cases, your only protection is to change the belt at the recommended intervals. The timing belt should also be inspected at every oil change for evidence of abnormal wear and tear. Your vehicle owner's manual will recommend at what mileage the timing belt must be replaced. These intervals range from every 60,000 miles to every 105,000 miles. Timing belt replacement is not cheap, but it is extremely important nonetheless.

Dec 01, 2010 | 2001 Oldsmobile Intrigue

2 Answers

When do i need to get the timing belt replaced?


Both timing belt and chain can wear out. A loose timing chain can result in poor running, valve clatter, and loss of power, while a broken timing belt can cause your engine to stop running or, on an interference application, cause your valves to crash into your pistons.
Timing belts fail without warning and on some vehicles, are almost as hard to check as they are to change. In most cases, your only protection is to change the belt at the recommended intervals. The timing belt should also be inspected at every oil change for evidence of abnormal wear and tear. Your vehicle owner's manual will recommend at what mileage the timing belt must be replaced. These intervals range from every 60,000 miles to every 105,000 miles. Timing belt replacement is not cheap, but it is extremely important nonetheless.

Nov 30, 2010 | 2006 Mitsubishi Lancer

3 Answers

How do you know if u need timing chain repair or replacement


in a nut sheel the car will run like do-do wiith no power or will not run at all.

Jun 13, 2010 | 1998 Chevrolet Camaro

3 Answers

Is it a timing belt on olds intrigue 2000, 3,5L?


this engine uses a timing chain, chains require no replacement unless the engine is being repaired or the chain or spockets fail

Mar 26, 2010 | 2000 Oldsmobile Intrigue

1 Answer

Does a 2004 Vue L4 have a timing chain or belt? When should it be replaced?


Both the 3.0 & 3.5 V6 engines in the Vue use a cam driven by a belt. Both are interference engines and the belt must be replaced at 100,000 miles. Warning: If the belt breaks serious engine damage will occur. The water pump is driven by the same belt so I highly recommend you replace it at the same time to save labor cost later on.

Nov 12, 2009 | 2004 Saturn VUE

1 Answer

Serpentine belt


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This is a job for an experienced technician. Probably about a $300 job. Maybe more.

Here is procedure for 1996:

Removal
  1. Drain the cooling system. Refer to Section 03-03 for the procedure.
  1. Disconnect the battery ground cable (14301).
  1. Remove the generator drive belt, water pump and power steering pump drive belt, and the A/C compressor drive belt (if equipped). Refer to Section 03-05 for the removal procedure.
  1. If equipped, remove the three A/C compressor drive belt idler pulley bolts and the A/C compressor drive belt idler pulley.
  1. Remove the upper radiator hose bracket bolt.
  1. Loosen the two upper radiator hose clamps and remove the radiator hose bracket bolt. Remove the upper radiator hose (8260) and the upper radiator hose bracket from the vehicle.
  1. Remove the water bypass hose (8597) from between the thermostat housing and the water hose connection (8592).
  1. Remove the main wiring harness from the upper engine front cover (6019).
  1. Remove the eight upper engine front cover bolts and the upper engine front cover.
  1. Raise and support the vehicle.
  1. Remove the RH front wheel and tire assembly.
  1. Remove the four RH outer engine and transmission splash shield bolts and two screws and remove the RH outer engine and transmission splash shield (6775).
  1. Use Strap Wrench D85L-6000-A or equivalent to hold the water pump pulley (8509) while removing the four water pump pulley bolts.
  1. Remove the water pump pulley from the water pump (8501).
  1. Remove the crankshaft pulley (6312). Refer to the procedure in this section.
  1. Remove the five lower engine front cover bolts and the lower engine front cover.
  2. Ensure that the timing marks between the crankshaft sprocket (6306) and the oil pump housing line up.
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18. NOTE: The directional arrow is necessary to ensure that the timing chain/belt (6268) can be reinstalled in the same direction.

If the timing chain/belt is to be reused, mark the direction of rotation on the timing chain/belt.

19. Loosen the timing chain/belt tensioner nut.

  1. Remove the timing chain/belt.
Installation
NOTE: Ensure that the timing marks on the camshaft sprockets (6256) and the seal plate are properly aligned. Ensure that the timing marks on the crankshaft sprocket and the oil pump housing are still aligned.



stv~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Pay special attention to the tooth shape of the timing belt. The current timing belts are not interchangeable with the timing belts from the 1993 model year. The 1993 model year uses a square or trapezoidal tooth timing belt while the current model year uses a rounded tooth design. The design change was made to extend the service life of the timing belt from 60,000 miles for the square or trapezoidal toothed belt to 105,000 miles for the rounded tooth belt. If the proper timing belt is not used, the customer may complain of a "whining" noise coming from the engine compartment. If the camshaft sprocket has a square cut in the valley of the gear tooth, it will require a square or trapezoidal tooth timing belt. If the camshaft sprocket has a rounded cut in the valley of the gear tooth, it will require a rounded tooth timing belt.
NOTE: If a new timing chain/belt is to be installed, make sure that the arrow is pointing away from the engine. If a timing chain/belt is to be reused, make sure that the directional arrow that was marked during disassembly is facing the correct direction.

NOTE: A new timing chain/belt has three white timing marks that indicate the correct timing positions of the camshafts and the crankshaft. These marks will help ensure that the engine (6007) is timed properly. When the engine is properly timed each white timing mark on the timing chain/belt will be aligned with the corresponding camshaft and crankshaft timing mark on the sprocket. Because the white timing marks are not evenly spaced you will need to refer to the following illustration for proper timing chain/belt placement. There should be 40 timing belt teeth between the timing marks of the front and rear camshaft sprockets and 43 teeth between the timing mark on the front camshaft sprocket and the timing mark on the crankshaft sprocket.

NOTE: Verify that the camshaft timing marks are aligned with the timing marks on the seal plate, and that the crankshaft sprocket timing mark is aligned with the timing mark on the oil pump (6600).

Install the timing chain/belt starting at the crankshaft sprocket and moving around to the camshaft sprockets following a counterclockwise path. Do not allow any slack in the timing chain/belt between the timing sprockets. After all of the timing marks are matched up with the timing chain/belt installed, slip the timing chain/belt onto the timing chain/belt tensioner.

  1. While holding the timing chain/belt tensioner with an Allen wrench, loosen the timing chain/belt tensioner nut.
  1. Allow the timing chain/belt tensioner to put pressure on the timing chain/belt.
  1. Use an Allen wrench to turn the timing chain/belt tensioner 70-80 degrees clockwise and tighten the timing chain/belt tensioner nut to 43-58 Nm (32-43 lb-ft).

    1. Rotate the crankshaft (6303) clockwise twice and align the No. 1 piston to Top Dead Center (TDC) on its compression stroke.
    1. Apply 98N (22 lbs) of force on the timing chain/belt between the rear camshaft sprocket and the timing chain/belt tensioner.
    2. NOTE: An assistant may be needed to adjust the timing chain/belt.

      While holding the timing chain/belt tensioner steady with an Allen wrench, loosen the timing chain/belt tensioner nut. Remove the Allen wrench and adjust the timing chain/belt tensioner as follows:
      1. Install a 0.35mm (0.0138 inch) thick and 12.7mm (0.500 inch) wide feeler gauge as shown.

  1. Turn the crankshaft clockwise to position the feeler gauge between the timing chain/belt tensioner and the timing chain/belt

  1. Tighten the timing chain/belt tensioner nut to 43-58 Nm (32-43 lb-ft).
  1. Turn the crankshaft clockwise to remove the feeler gauge from between the timing chain/belt tensioner and the timing chain/belt.
  1. Rotate the crankshaft clockwise twice and align the No. 1 piston to TDC on its compression stroke.
  1. Apply 98N (22 lbs) of force on the timing chain/belt between the rear and front camshaft sprocket.
    1. Measure the timing chain/belt deflection. Timing chain/belt deflection should be between 13-15mm (0.51-0.59 inch). If timing chain/belt deflection is not within specification, repeat steps 3-11. If the timing chain/belt cannot be adjusted to within specification, the timing chain/belt will have to be replaced.
    1. Position the lower engine front cover and install the five lower engine front cover bolts. Tighten the five lower engine front cover bolts to 3-5 Nm (27-44 lb-in).
    1. Install the outer timing chain/belt guide and the crankshaft pulley. Refer to the procedure in this section.
    1. Position the water pump pulley on the water pump and install the four water pump pulley bolts
    1. Use Strap Wrench D85L-6000-A or equivalent to hold the water pump pulley, and tighten the four water pump pulley bolts to 16-21 Nm (12-15 lb-ft).
    1. Position the RH outer engine and transmission splash shield and install the four RH outer engine and transmission splash shield bolts and two screws.
    1. Install the RH front wheel and tire assembly. Tighten the lug nuts (1012) to 98-118 Nm (72-87 lb-ft).



Feb 14, 2009 | 1993 Mercury Villager

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