Engine - Drive Belt Chirping Noise
NUMBER: 07-001-06GROUP: Cooling
DATE: February 15, 2006
THIS BULLETIN IS BEING PROVIDED IN ADVANCE. DO NOT ORDER PARTS OR PERFORM ANY ACTIONS RELATED TO THIS BULLETIN UNTIL FEBRUARY 20, 2006.
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 07-003-05, DATED JULY 28, 2005, WHICH SHOULD BE REMOVED FROM YOUR FILES. THIS IS A COMPLETE REVISION AND NO ASTERISKS HAVE BEEN USED TO HIGHLIGHT REVISIONS.
SUBJECT:
2.4L Engine - Chirp-Like Sound From Accessory Drive Belt
OVERVIEW:
This bulletin involves the installation of a new serpentine accessory drive belt and on some vehicles a revised drive belt routing.
MODELS:
2003 - 2005 (KJ) Liberty / Cherokee
2003 - 2006 (TJ) Wrangler
NOTE:
This bulletin applies to vehicles equipped with a 2.4L engine (sales code EDI) built prior to January 01, 2006 (MDH 0101XX).
SYMPTOM/CONDITION:
The customer may experience a chirp-like sound from the serpentine accessory drive belt. This condition may be most noticeable when the engine is at idle and during high ambient temperatures. Previous drive belt replacement(s) may have temporarily eliminated the drive belt chirp-like sound, with the sound returning after low mileage accumulation on the replacement belt.
DIAGNOSIS:
1. Verify that the front face surface of the power steering pulley center hub is flush with the end of the power steering pump shaft.
2. What model year is the vehicle?
a. If vehicle is 2006 M.Y. >> then perform SECTION A - REPLACE BELT
b. If vehicle is 2003 to 2005 M.Y. >> then perform SECTION B - REMOVE IDLER PULLEY AND REPLACE BELT
PARTS REQUIRED:
REPAIR PROCEDURE:
SECTION A - REPLACE BELT
CAUTION:
DO NOT LET THE BELT TENSIONER SNAP BACK TO THE FREEARM POSITION, SEVERE DAMAGE MAY OCCUR TO THE TENSIONER.
1. Disconnect and isolate the negative battery cable from the battery.
2. Rotate the belt tensioner arm until it contacts the stop to remove tension on the belt.
3. Remove the old drive belt and discard.
4. Slowly rotate the belt tensioner arm into the free arm position.
5. Check the condition of all pulleys
6. Temporarily route the new drive belt around all pulleys except the top left (driver side) idler pulley.
7. Rotate the belt tensioner arm until it contacts its stop position.
8. Route the new drive belt around the top left idler pulley and slowly let the tensioner arm rotate into the drive belt.
NOTE:
Belt tension is not adjustable. Belt adjustment is maintained by the automatic (spring loaded) drive belt tensioner.
9. Verify that the new drive belt is seated properly to all pulleys.
10. Connect the negative battery cable to the battery.
11. Set the clock to the correct time.
SECTION B - REMOVE IDLER PULLEY AND REPLACE BELT
NOTE:
THIS REPAIR INVOLVES A REVISED DRIVE BELT ROUTING. THE NEW DRIVE BELT ROUTING MAY DIFFER FROM THE RESPECTIVE SERVICE INFORMATION DRIVE BELT SCHEMATIC.
CAUTION:
DO NOT LET THE BELT TENSIONER SNAP BACK TO THE FREEARM POSITION, SEVERE DAMAGE MAY OCCUR TO THE TENSIONER.
1. Disconnect and isolate the negative battery cable from the battery.
2. Rotate the belt tensioner arm until it contacts the stop to remove tension on the belt.
3. Remove the old drive belt and discard.
4. Slowly rotate the belt tensioner arm into the free arm position.
5. Remove and discard the small idler pulley that is closest to the belt tensioner center hub. Refer to item 2 as illustrated in Figure 1 - "NEW BELT ROUTING - 2.4L WITH A/C" (Fig. 1), or in Figure 2 - "NEW BELT ROUTING - 2.4L WITHOUT A/C" (Fig. 2).
6. Check the condition of all pulleys.
7. Install the new serpentine accessory drive belt using the revised drive belt routing supplied by this Service Bulletin. The small idler pulley closest to the belt tensioner center hub will no longer be used (Fig. 1) (Fig. 2).
8. Temporarily route the new drive belt around all pulleys except the top left (driver side) idler pulley.
9. Rotate the belt tensioner arm until it contacts its stop position.
10. Route the new drive belt around the top left idler pulley and slowly let the tensioner arm rotate into the drive belt.
NOTE:
Belt tension is not adjustable. Belt adjustment is maintained by the automatic (spring loaded) drive belt tensioner.
11. Verify that the new drive belt is seated properly to all pulleys.
12. If present, remove the old under hood accessory drive belt instruction label from the vehicle engine compartment.
13. Connect the negative battery cable to the battery.
14. Set the clock to the correct time.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
FAILURE CODE:
Disclaimer:
This bulletin is supplied as technical information only and is not an authorization for repair.