Question about Nissan Maxima

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The crankshaft pulley on my daughter's '98 Maxima is broken (outside rim is cracked and loose) and the inside belt is twisted and shredded. If I replace the pulley, should that fix the problem our should I look for some underlying cause? A mechanic worked on it about a week ago when a belt broke and there's been a clunking sound upon startup since. He replaced the belt and something in the tensioning pulley (the mounting shaft from her description) because it wasn't turning. Maybe he is the underlying cause.

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  • louscannen2 Sep 07, 2009

    Thanks for your advice.

    Can't get the crankshaft pulley bolt loose, though. Doesn't it unscrew counterclockwise? I've taken a 2 ft breaker bar to it but it won't budge. I've got a screwdriver stuck through the spokes to keep it from turning and it's wedged in there pretty good. That is, it's not resting on a spoke and yet it still keeps the pulley from turning. Could the screwdriver be causing the pulley to bind on the mounting bolt or are crankshaft pulleys always this hard to get off?

  • louscannen2 Sep 07, 2009

    Thanks for the advice. Can't get the crankshaft pulley off, though. I took a 2ft breaker bar to it but it won't budge. They do unscrew counterclockwise, don't they?

  • louscannen2 Sep 07, 2009

    Thanks for the advice. Can't get the crankshaft pulley off, though. I took a 2ft breaker bar to it but it won't budge. They do unscrew counterclockwise, don't they?

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Since the pulley has obviously failed, replace it. Before starting it up, check all other pulleys and items turned by the belt to make sure none are loose or binding. After startup, look from the side and check for proper alignment and any visible wobble on pulleys. Without actually looking at it, I can't tell you what caused it, but, you can prevent it from happening again by checking as outlined. (surprised that the mechanic did not do that!)
good luck!

Posted on Sep 07, 2009

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Need to know timing marks


REMOVAL
1. Disconnect negative battery cable.
2. Loosen power steering lock bolts and nuts accordingly and remove tension from power steering (P/S) and/or air conditioning (A/C) compressor drive belt.
3. Remove P/S and/or A/C drive belt.
4. Loosen generator mounting bolts and adjusting bolt.
5. Remove generator bolts.
6. Remove water pump pulley.
7. Remove crankshaft pulley.
8. Remove upper and lower timing belt covers.
9. Turn crankshaft so that timing mark on timing belt pulley is aligned with timing mark on engine.
10. Check that "I" mark on intake camshaft pulley is aligned with mark on seal plate and "E" mark on exhaust camshaft pulley is aligned with mark on seal plate.
Do not move camshaft or crankshaft once timing marks have been correctly positioned.
11. Loosen tensioner pulley lock bolt.
12. Protect timing belt with a rag.
13. Remove tensioner pulley.
14. Remove timing belt. Mark the direction of timing belt rotation (on the timing belt) for proper reinstallation.

INSTALLATION
1. Install tensioner pulley. Replace tensioner spring whenever timing belt is replaced.
2. Pull tensioner pulley to its furthest point and tighten lock bolt.
3. Check that timing mark on timing belt pulley is aligned with timing mark on engine.
4. Check that "I" mark on intake camshaft pulley is aligned with mark on seal plate and "E" mark on exhaust camshaft pulley is aligned with mark on seal plate.
If existing timing belt is being reused, install belt in proper rotation direction marked prior to removal.
5. Install timing belt onto timing belt pulley first, then idler pulley, exhaust camshaft pulley, intake camshaft pulley, and tensioner pulley in that order.
6. Check that there is no looseness in belt between idler pulley and exhaust camshaft pulley or between intake and exhaust camshaft pulleys.
7. Loosen tensioner pulley lock bolt and allow tensioner spring to apply tension to timing belt.
Do not add additional tension.
8. Tighten tensioner pulley lock bolt to specified torque.
Tightening torque:28~38 lb-ft (38~51 N·m, 3.9~5.2 kg-m)
9. Rotate crankshaft two full revolutions (clockwise only) and align timing mark on timing belt pulley with timing mark on engine block.
10. Check that "I" mark on intake camshaft pulley and "E" mark on exhaust camshaft pulley are aligned with marks on seal plate.
11. If they are not aligned, remove timing belt and start process from tensioner installation.
12. Measure timing belt deflection by applying moderate pressure midway between camshaft pulleys. If deflection is not correct, repeat from tensioner installation.
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13. Install lower and upper timing belt covers in that order.
Tightening torque:5.8~8.0 Ib-ft (7.9~10.7 N·m, 0.8~1.1 kg-m)
14. Install timing belt guide plate and crankshaft pulley.
Tightening torque:9.0~12.6 lb-ft (12.3~17.2 N·m, 1.3~1.8 kg-m)
15. Install water pump pulley.
Tightening torque:9.0~12.6 lb-ft (12.3~17.2 N·m, 1.3~1.8 kg-m)
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INSPECTION
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5. Inspect camshaft pulleys and timing belt pulley for broken teeth or damage.
Replace any component that shows damage, excessive wear, or that appears prone to a possible failure.

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The Timing belt


Recommended by kia is 100,000 km.

Timing Belt: Service and Repair
TIMING BELT
COMPONENT
REMOVAL
1. Disconnect negative battery cable.
2. Loosen power steering lock bolts and nuts accordingly and remove tension from Power Steering (P/S) and/or Air Conditioning (A/C) compressor
drive belt.
3. Remove P/S and/or A/C drive belt.
4. Loosen generator mounting bolts and adjusting bolt.
5. Remove generator bolts.
6. Remove water pump pulley.
7. Remove crankshaft pulley and timing belt guide plate.
8. Remove upper and lower timing belt covers.
9. Turn crankshaft so that timing mark on timing belt pulley is aligned with timing mark on engine.
10. Check that "I" mark on intake camshaft pulley is aligned with mark on cylinder head cover and "E" mark on exhaust camshaft pulley is aligned
with mark on cylinder head cover.
NOTE: Do not move camshaft or crankshaft once timing marks have been correctly positioned.
11. Loosen tensioner pulley lock bolt.
12. Protect timing belt with a rag.
13. Remove tensioner pulley.
14. Remove timing belt.
NOTE: Mark the direction of timing belt rotation (on the timing belt) for proper reinstallation.
INSPECTION
NOTE: Never forcefully twist, turn inside out or bend timing belt. Do not allow oil or grease to come in contact with timing belt.
1. Replace timing belt if it is contaminated with oil or grease.
2. Check timing belt for uneven wear, fraying, peeling, cracking and hardening. Replace timing belt as necessary.
3. Bend timing belt into a "U" shape as shown in figure. Distance "A" must be at least 1.0 inch (25 mm).
4. Inspect both idler pulley and tensioner pulley for uneven wear and smooth bearing operation.
5. Inspect camshaft pulleys and timing belt pulley for broken teeth or damage.
NOTE: Replace any component that shows damage, excessive wear, or that appears prone to a possible failure.
INSTALLATION
1. Install tensioner pulley.
NOTE: Replace tensioner spring whenever timing belt is replaced.
2. Pull tensioner pulley to its furthest point and tighten lock bolt.
3. Check that timing mark on timing belt pulley is aligned with timing mark on engine.
4. Check that "I" mark on intake camshaft pulley is aligned with mark on cylinder head cover and "E" mark on exhaust camshaft pulley is aligned
with mark on cylinder head cover.
NOTE: If existing timing belt is being reused, install belt in proper rotation direction marked prior to removal.
5. Install timing belt onto timing belt pulley first, then idler pulley, exhaust camshaft pulley, intake camshaft pulley, and tensioner pulley in that
order.
6. Check that there is no looseness in belt between idler pulley and exhaust camshaft pulley or between intake and exhaust camshaft pulleys.
7. Loosen tensioner pulley lock bolt and allow tensioner spring to apply tension to timing belt.
NOTE: Do not add additional tension.

8. Tighten tensioner pulley lock bolt to specified torque.
Tightening torque: 28 - 38 ft. lbs. (38 - 51 Nm, 3.9 - 5.2 kg-m)
9. Rotate crankshaft two full revolutions (clockwise only) and align timing mark on timing belt pulley with timing mark on engine block.
10. Check that "I" mark on intake camshaft pulley and "E" mark on exhaust camshaft pulley are aligned with marks on cylinder head cover.
11. If they are not aligned, remove timing belt and start process from tensioner installation.
12. Measure timing belt deflection by applying moderate pressure midway between camshaft pulleys. If deflection is not correct, repeat from
tensioner installation.
Deflection pressure: 22 lb. (98 N, 10 kg)
Deflection: 0.39 - 0.50 inch (11 - 13 mm)
13. Install lower and upper timing belt covers in that order.
Tightening torque: 5.8 - 8.0 ft. lbs. (7.9 - 10.7 Nm, 0.8 - 1.1 kg-m)
14. Install timing belt guide plate and crankshaft pulley.
Tightening torque: 9.0 - 12.6 ft. lbs. (12.3 - 17.2 Nm, 1.3 - 1.8 kg-m)
15. Install water pump pulley.
Tightening torque: 9.0 - 12.6 ft. lbs. (12.3 - 17.2 Nm, 1.3 - 1.8 kg-m)
16. install generator belt and adjust the tension.
17. Install P/S and/or A/C drive belt and adjust the tension.
18. Connect negative battery cable.

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