Honda_Odyssey_2001-2006

Accessory Drive Belts

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Adjustment



Belt tension on multi-ribbed V-belts can be checked by applying a force on the belt at the center point of its longest straight span. The belt movement (deflection) is then measured to determine if the belt is properly tensioned. If the belt is loose, it will slip, whereas if the belt is too tight it will damage the bearings in the driven unit.

To tension a multi-ribbed V-belt there are generally three types of mounting and adjustment methods for the various components driven by the drive belt. These types of mounting and adjustment methods are as follows:



A pivoting component without an adjuster. This method, referred to as pivoting type without adjuster, is designed such that the component is secured by at least 2 bolts. One of the bolts is a pivoting bolt and the other is the lockbolt. When both bolts are loosened so that the component may move, the component pivots on the pivoting bolt. The lockbolt passes through the component and a slotted bracket, so that when the lockbolt-s nut is tightened the component is held in that position. The component must be moved by hand, or by carefully leveraging it with a properly placed object such as a hardwood handle or suitable prytool.
 


CAUTION
Always disable the power to the vehicle by disconnecting the negative battery cable before checking, replacing or adjusting the drive belts. Working with the drive belts requires placing tools, hands and fingers near areas of potential danger. In addition, the cooling fan could engage even with the ignition in the OFF position.



A pivoting component with an adjuster. This method of component mounting, referred to as pivoting type with adjuster, is designed such that the component is secured by at least 2 bolts, with one of the bolts serving as a pivoting bolt and the other a lockbolt. When the mounting bolts are loosened so that the component may move, the component is moved by turning an adjustment bolt. The adjuster is composed of a bracket attached to the component and a threaded adjusting bolt. After loosening the pivoting and lockbolts, the adjusting bolt can be tightened or loosened to increase or decrease the drive belt-s tension. With this type of mounting, the component does not have to be held in a tensioned position while tightening the pivoting and lockbolts, because the adjusting bolt applies the tension to the belt.
 
A stationary mounted component with an adjustable idler pulley. This type of component mounting is referred to as the stationary type, because, the component is mounted in a stationary position without the use of pivoting or lockbolts. The drive belt tension is adjusted by moving the position of an idler pulley.
 


NOTE
When checking or adjusting the multi-ribbed V-belts, note that the belt deflection specification varies from component to component, and changes if the belt is new or used. Note, the amount of force applied to the belts when checking belt deflection is 22 lbs. (98 N), however the amount of deflection varies depending on belt type and whether new or used. Refer to the following information for each model to properly check and adjust the multi-ribbed drive belts.

J351 & J35A4 Engines

These models utilize both a multi-ribbed V-belt and a serpentine belt. The serpentine belt is used to drive the alternator and air conditioner compressor and the multi-ribbed V-belt is used for the power steering pump.

Alternator/Air Conditioner Belt

The air conditioner compressor and alternators are both driven by a single serpentine belt and both units are mounted to the engine and cannot be moved, thus the belt is tensioned by a self adjusting tensioning pulley. No adjustment is possible, however the belt tension can be checked. For specific details refer to the information in this section.

Power Steering Pump Belt
  1. Note the radio security code and disconnect the negative battery cable.
  2.  
  3. Loosen the power steering pump mounting nut (A) and bolt (B).
  4.  
  5. Turn the adjusting nut (C) to get the proper belt tension. Turning the adjustment nut clockwise increases the belt tension, conversely, turning the adjustment nut counterclockwise will decrease the belt tension.
  6.  
  7. Retighten the mounting nut and bolt.
  8.  
  9. Connect the negative battery cable.
  10.  
  11. Start the engine and turn the steering wheel from lock-to-lock several times, then stop the engine and recheck the tension of the belt.

    Click image to see an enlarged view

    Fig. Loosen the power steering pump mounting nut (A) and bolt (B). Turn the adjusting nut (C) to get the proper belt tension, then retighten the mounting nut and bolt

  12.  

J35A6 & J35A7 Engines

These models utilize a single serpentine belt to drive the accessories. The belt is tensioned by a self adjusting tensioning pulley. No adjustment is possible, however the belt tension can be checked. For specific details refer to the information in this section.

Inspection



Alternator-A/C Compressor Belt
J35A1 Engine
  1. Inspect the belt for cracks and damage. If the belt is cracked or damaged, replace it.
  2.  
  3. Check that the pointer (A) on auto-tensioner housing is not beyond the edge of the indicator rib (B) on the tensioner base. If pointer is beyond the indicator rib, replace the alternator-compressor belt.

    Click image to see an enlarged view

    Fig. Check that the pointer (A) on auto-tensioner housing is not beyond the edge of the indicator rib (B) on the tensioner base-J35A1 engine

  4.  

J35A4 Engine
  1. Inspect the belt for cracks and damage. If the belt is cracked or damaged, replace it.
  2.  
  3. Check that the pointer (A) on the oil pump is not beyond the edge of the indicator rib (B) on the auto-tensioner. If pointer is beyond the indicator rib, replace the alternator-compressor belt.

    Click image to see an enlarged view

    Fig. Check that the pointer (A) on the oil pump is not beyond the edge of the indicator rib (B) on the auto-tensioner-J35A4 engine

  4.  

Power Steering Pump Belt
J35A1 & J35A4 Engines

NOTE
There are two ways to inspect the belt tension: the Belt Tension Gauge Method and the Deflection Method. Both are outlined below.

Belt Tension Gauge Method

  1. Attach the belt tension gauge to the belt with the gauge face toward the engine, and measure the tension of the belt. Follow the manufacture's instructions. If the belt is worn or damaged, replace it.
    NOTE
    Remove the belt tension gauge carefully to avoid hitting the gauge reset lever.

  2.  
  3. The tension should be:
    1. Used Belt: 88-120 lbs. (390-540 N)
    2.  
    3. New Belt: 170-200 lbs. (740-880 N)
    4.  

  4.  
  5. If you installed a new belt, run the engine for 5 minutes, then readjust the belt to the used belt specifications.

    Click image to see an enlarged view

    Fig. Using a belt tension gauge to inspect the power steering pump belt tension

  6.  

Deflection Method

  1. Apply a force of 22 lbs. (98 N) and measure the deflection between the power steering pump pulley (A) and the crankshaft pulley (B).
  2.  
  3. The deflection should be:
    1. Used Belt: 0.51-0.65 in. (13.0-16.5mm)
    2.  
    3. New Belt: 0.33-0.43 in. (8.5-11.0mm)
    4.  

  4.  
  5. If you installed a new belt, run the engine for 5 minutes, then readjust the belt to the used belt specifications

    Click image to see an enlarged view

    Fig. Apply a force of 22 lbs. then measure the deflection between the power steering pump pulley (A) and the crankshaft pulley (B)

  6.  

Serpentine Belts
J35A6 Engine
  1. Inspect the belt for cracks and damage. If the belt is cracked or damaged, replace it.
  2.  
  3. Check that the auto-tensioner indicator (A) is within the standard range (B) as shown. If it is out of the standard range, replace the drive belt.

    Click image to see an enlarged view

    Fig. Check that the auto-tensioner indicator (A) is within the standard range (B) as shown. If it is out of the standard range, replace the drive belt-J35A6 engine

  4.  

J35A7 Engine
  1. Inspect the belt for cracks and damage. If the belt is cracked or damaged, replace it.
  2.  
  3. Check that the auto-tensioner indicator (A) on the oil pump not beyond the edge of the indicator rib (B) on the auto-tensioner. If the pointer is beyond the indicator rib, replace the drive belt.

    Click image to see an enlarged view

    Fig. Check that the auto-tensioner indicator (A) on the oil pump not beyond the edge of the indicator rib (B) on the auto-tensioner-J35A7 engine

  4.  

Removal & Installation



If a belt must be replaced, the driven unit or idler pulley must be loosened and moved to its extreme loosest position, generally by moving it toward the center of the engine. After removing the old belt, check the pulleys for dirt or built-up material, which could affect belt contact. Carefully install the new belt, remembering that it is new and unused; it may appear to be just a little too small to fit over the pulley flanges. Fit the belt over the largest pulley (usually the crankshaft pulley at the bottom center of the engine) first, then work on the smaller one(s). Gentle pressure in the direction of rotation is helpful. Some belts run around a third, or idler pulley, which acts as an additional pivot in the belt's path. It may be possible to loosen the idler pulley as well as the main component, making the job much easier. Depending on which belt(s) being changed, it may be necessary to loosen or remove other interfering belts to access the being replaced.


CAUTION
Always disable the power to the vehicle by disconnecting the negative battery cable before checking, replacing or adjusting the drive belts. Working with the drive belts requires placing tools, hands and fingers near areas of potential danger. In addition, the cooling fan could engage even with the ignition in the OFF position.

When buying replacement belts, remember that the fit is critical according to the length of the belt (diameter) and the width of the belt. The belt shape should match the shape of the pulley exactly. Belts that are not an exact match can cause noise, slippage and premature failure.

After the new belt is installed, draw tension on it by moving the driven unit or idler pulley away from the engine and tighten its mounting bolts. This is sometimes a three or four-handed job; and an assistant could be helpful. Make sure that all the bolts that have been loosened are retightened and that any other loosened belts have the correct tension. A new belt can be expected to stretch a bit after installation, so be prepared to readjust the new belt, if needed, within the first two hundred miles of use.

J35a1 And J35a4 Engines
Alternator Belt/Air Conditioner Belt
  1. On 2002-04 models, remove the splash shield.
  2.  
  3. Move the auto-tensioner (A) to relive tension from the alternator-compressor belt (B), and remove the belt.
  4.  
  5. Install the new belt in the reverse order of removal.

    Click image to see an enlarged view

    Fig. Move the auto-tensioner (A) to relive tension from the alternator-compressor belt (B), and remove the belt-J35A1 engine



    Click image to see an enlarged view

    Fig. Move the auto-tensioner (A) to relive tension from the alternator-compressor belt (B), and remove the belt-J35A4 engine

  6.  

To install:

  1. Begin to route the belt over the pulleys, leaving whichever pulley the belt was first released from during removal for last.
  2.  
  3. Once the belt is mostly in place, carefully pivot the tensioner and position the belt over the final pulley. Carefully release the pressure on the tensioner and it to contact with the belt, making sure the belt is properly seated in the ribs. If not, release the tension and seat the belt.
  4.  
  5. Once the belt is installed, take another look at all the pulleys to double check the installation.
  6.  
  7. Install and properly tension the power steering belt.
  8.  
  9. Connect the negative battery cable, enter the radio presets, then start and run the engine to check belt operation.
  10.  
  11. Once the engine has reached normal operating temperature, turn the ignition OFF and check that the belt tensioner arrow is within the proper adjustment range.
  12.  

Power Steering Pump Belt

The power steering pump has two fasteners securing it to a bracket mounted on the engine. The right side locknut and fastener are installed through a slotted bracket and the left side fastener allows the pump to pivot.

  1. Note the radio security code and disconnect the negative battery cable.
  2.  
  3. Loosen the right side locknut and left side pivot nut.
  4.  
  5. Move the pump by turning the adjustment nut on the right side bracket. Turn the adjustment nut counterclockwise to release the belt tension.
  6.  
  7. Remove the belt from the pulleys, one pulley at a time.
  8.  

To install:

  1. Install the belt around the pulleys, beginning with the largest pulley first.
  2.  
  3. Follow the adjustment procedure to correctly tension the belt.
  4.  
  5. Tighten the right side locknut and left side pivot bolt and then check the belt tension. If the belt tension is not within specification, repeat the adjustment procedure until the proper belt tension is achieved.
  6.  
  7. Reconnect the negative battery cable and enter the radio security code.
  8.  

J35a6 Engine

NOTE
This procedure requires the use of Belt tension release tool Snap-on YA9317 or equivalent belt tension release tool.

  1. Move the auto-tensioner (A) with the belt tension release tool to relieve tension from the drive belt (B), then remove the drive belt.
  2.  
  3. Install the new belt in the reverse order of removal.

    Click image to see an enlarged view

    Fig. Move the auto-tensioner (A) with the belt tension release tool to relieve tension from the drive belt (B), then remove the drive belt



    Click image to see an enlarged view

    Fig. Belt routing and related components-J35A6 engine

  4.  

J35a7 Engine
  1. Insert a hexagon socket wrench into the drive belt auto-tensioner (A), and slowly turn the wrench in the direction of the rotation arrow, then remove the drive belt (B).
    NOTE
    This is a hydraulic type auto-tensioner, so you must turn the wrench slowly.



    Click image to see an enlarged view

    Fig. Insert a hexagon socket wrench into the drive belt auto-tensioner (A), and slowly turn the wrench in the direction of the rotation arrow, then remove the drive belt (B)

  2.  
  3. Install the new belt in the reverse order of removal.

    Click image to see an enlarged view

    Fig. Belt routing and related components-J35A7 engine

  4.  

 
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