Question about 1991 Nissan Pathfinder

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Okay. I got the old timing belt out and found that all the teeth were gone where it goes around the crankshaft gear. I put a new timing belt on and lined up the marks, but when I rotate the engine several times the timing marks on the belt move over a few teeth off the camshaft gear marks and no longer line up. I'm using a Haynes manual for this, but am I missing something that they don't say in the book?

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The marks on the belt itself will not line up with gear marks after rotating engine as long as engine marks line up you are fine however these are know to bend valves

Posted on Aug 21, 2010

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Alot of vehicle timing specs will not line back up after a single revolution of the engine. Make sure the marks line up when you come back to the number one piston at TDC "top dead center" on the compression stroke and check again. I it doesn't you probably installed it on exhaust stroke.

please vote if this helps

Posted on Aug 21, 2010

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2 Answers

What is the problem when I set the camshaft timing marks in their proper positions they move 1 tooth mark over after every 2 crankshaft revolutions


i would think the cam marks will only line up again after turning cam when it has completed one completd cycle , what is it you are trying to achieve ?

Sep 20, 2015 | Cars & Trucks

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How do you put a timing belt back in time after it broke?


Well, hopefully the valves were not damaged when the belt broke, If no valve damage was done, get the engine/crankshaft to top dead center, line up camshaft sprocket to timing mark and install belt around pulleys, gears, replace water pump if needed, tension belt if no automatic tensioner is used, try to start to see if it runs and hopefully it will. Might be time for an engine if valve damage was done.

Jul 14, 2014 | 1992 Chrysler Lebaron

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Car cranks over, but does not start. has spark and the fuel pump is working. what may be the issue?


this car has no chain! It has a toothed rubber belt for timing belt. It could have broken or the crankshaft toothed pulley (behind the harmonic balancer or main accessory belts pulley) has either broke off teeth or shaved off the timing belt teeth but it still should move under tension. Remove the top black plastic timing belt cover( 2 each 8mm screws or may have Phillips + center). You can see if the belt is on tight or even if it will turn when you try to start. Have someone turn it over while you observe the belt. That is my problem but I haven't gone to the process of taking it all apart yet. Not a fun job and it's expensive! Not only that but since you are replacing the belt one way or the other, there are kits for this engine with new pulleys, belt etc...) Consider replacing water pump if its old or you will be doing the same thing soon to replace the pump! Might as well do it now!

Feb 18, 2011 | 2001 Chrysler Sebring

1 Answer

How do you set the timing when installing new timing belts


Depending on make and size of engine u need to get the #1 piston at tdc top dead center u do this by taking the spark plug out of the #1 cylinder put yure finger in sparkplug hole and turn cranshaft till u feal yure finger being pushed out by compression now take a straw and put it in the spark plug hole u will need a breaker bar on larger engines to turn the crank with the bolt on the pully small 4 cyl u can turn it by hand once u feal the straw being pushed out of the whole turn the crankshaft back and forth to get the straw exactly where its all the way up just before it goes back down yure at tdc now on the gears there is a dot or a mark on the front side line them up using a straight edge line them up so both marks are on the inside facing one another pull both gears out leave the bigger of the two on the shaft place the belt on the smaller of of the cam shaft now u want to put the belt on the bottom side of larger gear and try and get the teeth so the top and bottom gear marks line up again when u push cam gear on splean of cam shaft if they apear to b lined up a little at a time push crankshaft gear n a bit then cam shaft gear switching between the two till they are all the way seated and there u go

Dec 11, 2010 | Subaru Loyale Cars & Trucks

1 Answer

How to replace timing belt on a 1992 pontiac sunbird


1989–92 VEHICLES
  1. Disconnect the negative battery cable.
  2. Remove the serpentine belt and timing belt cover.
  3. Loosen the water pump bolts and release tension with tool J–33039 or equivalent.
  4. Raise and support the vehicle safely.
  5. Remove the crankshaft pulley.
  6. Carefully lower the vehicle, then remove the timing belt. Fig. 11: Exploded view of the timing belt assembly — 1989–92 OHC engines 87953118.gif
    To install:
  7. Turn the crankshaft and the camshaft gears clockwise to align the timing marks on the gears with the timing marks on the rear cover.
  8. Install the timing belt, making sure the portion between the camshaft gear and crankcase gear is in tension.
  9. Using tool J–33039 or equivalent, turn the water pump eccentric clockwise until the tensioner contacts the high torque stop. Tighten the water pump screws slightly.
  10. Turn the engine by the crankshaft gear bolt 720°to fully seat the belt into the gear teeth.
  11. Turn the water pump eccentric counterclockwise until the hole in the tensioner arm is aligned with the hole in the base.
  12. Tighten the water pump screws to 18 ft. lbs. (24 Nm), while checking that the tensioner holes remain as adjusted in the prior step.
  13. Install the crankshaft pulley, timing belt cover and the serpentine drive belt.
1993–94 VEHICLES
  1. Disconnect the negative battery cable, then partially drain and recover the cooling system.
  2. Remove the coolant recovery reservoir.
  3. If equipped, remove the A/C belt.
  4. Remove the serpentine belt.
  5. Disconnect the evaporative emission pipe assembly.
  6. Remove the crankshaft pulley assembly.
  7. As outlined earlier, remove the timing belt front cover.
  8. Align the marks on the crankshaft sprocket with the marks on the rear timing belt cover by rotating the crankshaft.
  9. Loosen the water pump retaining bolts, and release the tension with tool J 33039-A or equivalent.
  10. Carefully lower the vehicle, then remove the timing belt. Fig. 12: Timing belt installation and tightening specifications — 1993–94 2.0L OHC engines 87953119.gif
    To install:
  11. Turn the crankshaft and camshaft gears clockwise to align the timing marks on the gears with the timing marks on the rear cover.
  12. Install the timing belt, making sure that the portion between the camshaft gear and crankshaft gear is in tension.
  13. Using tool J 33039-A, or equivalent adjustment tool, turn the coolant pump eccentric clockwise until the tensioner arm contacts the high torque stop. Tighten the water pump screws slightly.
  14. Turn the engine by the crankshaft gear bolt 720°clockwise to fully seat the belt into the gear teeth.
  15. Turn the coolant pump eccentric counter clockwise until the hole in the tensioner arm is aligned with the hole in the base. This must be done with the engine at room temperature, approximately 68°F (20°C).
  16. Tighten the water pump screws while checking that the tensioner holes remain as adjusted as in step 15.
  17. As outlined earlier, install the timing belt cover.
  18. Install the crankshaft pulley.
  19. Connect the evaporative emission pipe assembly.
  20. Install the serpentine drive belt and the A/C belt (if equipped).
  21. Install the coolant recovery reservoir.
  22. Properly fill the cooling system, then connect the negative battery cable.
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Aug 11, 2010 | 1992 Pontiac Sunbird

2 Answers

Difficulty accelerating and it simply sounds rough


The Timing Belt runs from the Crankshaft of the engine.
In turn, it goes around the Camshaft gear, or gears.

The Camshaft opens the Valves in the Cylinder Head.

These valves open to bring in the air/fuel mixture, (Intake Valve/s), and let out the Exhaust.
(Exhaust valves)

These must be done in a precise fashion.

If the Intake valve closes too late, you will lose compression, hence power.
If the Exhaust valve opens too early, you will early you will lose power.

When a timing belt stretches due to wear, it allows the above conditions to happen.

(The Timing Belt has teeth on the inside of it. These teeth match notches on the timing gears. One gear for the Camshaft, or Each camshaft, and one for the Crankshaft.

The teeth wear down, and the belt also stretches. All it takes, is a discrepancy of a few thousandths of an inch.

An average human hair is .003 thick. Three thousandths.
60 thousandths stretch of the belt will cause these problems. 60 thousandths is approximately 1/16th of an inch)

This animation may help to explain how your Four Stroke engine in your Volkswagon works. This way you can see the Cylinder Head, Camshaft, Crankshaft, and Valves that I have been referring to,

http://www.howstuffworks.com/engine1.htm

Doesn't show the Timing gears, or timing belt.
The animation at the top right of the page, shows an engine with dual overhead camshafts.

Two camshafts.

This shows how a timing belt is incorporated,

http://www.samarins.com/glossary/timing_belt.html

Yes, if the timing belt is known to be bad, this will definitely cause a power problem.

A clogged Catalytic Converter will also.
There are pellets inside a catalytic converter.
These pellets would remind you of small peas.

Over time they break down, and form clumps. The clumps can restrict the exhaust gases from escaping out of the catalytic converter, and cause back pressure.

This will rob the vehicle of power. After time the restriction may be so great, that no exhaust gases will be allowed to escape, and the vehicle will not run.

Dec 19, 2009 | 1999 Volkswagen Beetle

1 Answer

How to set timming belt,cant find mark for crankshaft 3.0L


Timing belt removed, static timing was not set before removing timing belt.

[Set Static Timing:
No.1 piston is brought up to TDC before removing timing belt.

Cam gear has a punchmark on face of gear, and this mark aligns with one single tooth. There is a matching punchmark on the Timing Belt Rear Upper Cover.

Facing the cam gear, the mark is to the upper right. There is an 'egg shape' of the timing belt upper rear cover, in this spot. This punchmark is in that 'egg shape', and is close to a bolt hole. The cam gear mark lines up with the Timing Belt Rear Upper Cover, mark.

The crankshaft gear has a punchmark on the face. It lines up with one single tooth. There is a corresponding punchmark on the lower right side. An alignment mark)

Should be a round punchmark on the face of the crankshaft gear. It lines up with a single tooth. Wipe the gear clean, use a little carb cleaner. (NO flames, or sparks nearby, well ventilated area)

Barring you cannot find the crankshaft mark, find the camshaft alignment marks, make sure they are aligned with the alignment, (Punchmark), on the Timing Upper Rear Cover.

Count the teeth in the timing belt. There should be 133 teeth on the belt.

There is 43 teeth in-between the timing mark of the camshaft, and the timing mark on the crankshaft.

(43 teeth in-between the Right Side Camshaft mark to crankshaft mark, 43 teeth in-between the Left Side Camshaft mark to crankshaft mark)

There should be 40 teeth in-between the two cam gears.




Oct 24, 2009 | 1989 Nissan Pathfinder

2 Answers

2003 Hyundai Sonata vvvibbbrraattteess!!!!


There are Two Balance Shafts on the 2.4. Did your mechanic also change the balance shaft belt when he changed the timing belt? If he didn't, you'll want to do that. Since you mentioned the old belt was missing teeth, those loose teeth flying around could have damaged the crank position sensor and sensor blade (tone wheel). Also, the front balance shaft (on the side of the engine nearest the radiator), has THREE different positions when the timing mark is lined up - here's the glitch - ONLY ONE of them is the correct one - this is probably where your vibration is.

Oct 10, 2009 | Hyundai Motor 2003 Sonata

4 Answers

Car won't start can you help?


The pistons may be shot. If not this then the head geasket may have gone.

May 19, 2009 | 1992 Eagle Talon

3 Answers

I need timing specs for 3.5 2002 Isuzu Axiom


I have found that one can mark (Paint pen) the gears and teeth (One tooth and one corresponding belt rib) on each gear prior to removing the belt. You can then overlay the old belt on a new belt and mark the same spots on the new belt and then install the belt so your marks on the gears and belt line up as they did before you removed the old belt. Given that your timing was right to start with....if done correctly, this will work.

May 05, 2009 | 2002 Isuzu Axiom

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