TSB 03-06-01-024B Mar 04

[Mr. Smith]

I have a 2000 Jimmy 4.3. It has the timing chain noise/rattle as this TSB covers. I can't get it locally as the dealer won't help me out. Does anyone have the TSB so I can see what I need to get to upgrade it.

 

The noise has gradually grown louder during accel and I don't want to chance grenading a motor if I ignore it. Thanks.

[Mr. Smith]

25 views and no hits. not good.

 

 

I have a 2000 Jimmy 4.3. It has the timing chain noise/rattle as this TSB covers. I can't get it locally as the dealer won't help me out. Does anyone have the TSB so I can see what I need to get to upgrade it.

 

The noise has gradually grown louder during accel and I don't want to chance grenading a motor if I ignore it. Thanks.

 

<{POST_SNAPBACK}>

 

 

[GM-Tech]

Rattle Noise in Engine (Install Timing Tensioner Kit) #03-06-01-024B - (Mar 4, 2004)

 

 

1996-2003 Chevrolet Astro, Blazer, Express, S-10, Silverado

 

1996-2003 GMC Jimmy, Safari, Savana, Sierra, Sonoma

 

1996-2001 Oldsmobile Bravada

 

with 4.3L V6 Engine (VINs W, X -- RPOs L35, LU3)

 

This bulletin is being revised to change warranty information. Please discard Corporate Bulletin Number 03-06-01-024A (Section 06 -- Engine/Propulsion System).

 

Condition

Some customers may comment on a rattle-type noise coming from the engine at approximately 1800 to 2200 RPMs.

 

Cause

The spark, rattle-type noise may be caused by torsional vibration of the balance shaft.

 

Correction

If detonation noise is present , perform detonation/spark knock diagnostics first.

 

Install a new tensioner assembly kit using the procedure below.

 

Remove the engine front cover. Refer to SI for engine front cover removal procedure.

Remove the crankshaft sensor reluctor ring and line up the timing marks on the crank gear and cam shaft gear.

Remove the camshaft gear and chain. For model years 1996-1998, remove the crankshaft sprocket using J 5825-A.

Pull the shipping pin and discard. Remove the nylon timing chain tensioner blade from the timing chain tensioner bracket.

Position the bracket on the front of the engine. The upper two attaching holes of the bracket will line up with the center two engine front cover bolt holes. The lower bracket holes will line up with the engine front cover alignment holes.

 

Use a hammer and the J 46165 Pin Driver to install the dowel pins through the two lower holes in the bracket and into the engine block. Make sure that the bracket is held firmly in place before proceeding.

For model years 1996-1998, install a roller-type timing chain set. Install the crankshaft sprocket using the J 5590 Crankshaft Gear Installer.

Install the timing chain around the crankshaft sprocket and position the timing chain to the driver's side of the engine.

 

Install the nylon timing chain tensioner guide onto the timing chain tensioner bracket pin and position the top of the guide under the tab at the top of the bracket.

Install the camshaft sprocket into the chain and then to the camshaft. Install the bolts finger-tight. Make sure the timing marks are aligned, then tighten the camshaft sprocket bolt.

 

Tighten

Tighten the bolt to 25 N·m (18 lb ft).

 

Install the crankshaft reluctor ring.

 

Install the engine front cover and place a washer under the two center cover bolts that extend through the tensioner bracket. These washers are required to maintain the proper crush on the engine front cover seal.

 

Tighten

Tighten the bolts to 12 N·m (106 lb in).

 

Parts Information

Part Number

Description

Qty

 

12458911

Chain kit

1

 

89017257

Tensioner

1

 

10220906

Oil pan gasket

1

 

88893989

O ring and gasket kit

1

 

3754587

Water pump gasket

2

 

89017259

Cover

1

 

 

Parts are currently available from GMSPO.

 

Warranty Information

For vehicles repaired under warranty, use:

 

Labor Operation

Description

Labor Time

 

J1944

Tensioner, Timing Chain - Install

 

(S-10 Blazer, Pick Up, S-15 Jimmy, Sonoma With Manual Transmission)

8.6 hrs

 

Tensioner, Timing Chain - Install

 

(S-10 Blazer, Pick Up, S-15 Jimmy, Sonoma with Automatic Transmission)

9.0 hrs

 

Tensioner, Timing Chain - Install

 

(T-10 Blazer, Pick Up, T-15 Jimmy, Sonoma and Bravada)

7.5 hrs

 

Tensioner, Timing Chain - Install

 

(Express, Savana)

4.1 hrs

 

Tensioner, Timing Chain - Install

 

(Silverado, Sierra with Four Wheel Drive)

7.5 hrs

 

Tensioner, Timing Chain - Install

 

(Astro, Safari With All Wheel Drive)

7.5 hrs

 

Tensioner, Timing Chain - Install

 

(Astro, Safari)

3.9 hrs

 

Tensioner, Timing Chain - Install

 

(Silverado, Sierra)

3.9 hrs

 

Add

To Replace Crankshaft Gear

0.2 hr

 

Add

To Clean Parts On Vehicle over 48,280 km (30,000 mi)

0.1-0.3 hr

 

Add

With Skid Plate

0.2 hr

 

Add

With A/C

0.2 hr

 

 

 

 

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

 

 

© Copyright General Motors Corporation. All Rights Reserved.

[Mr. Smith]

Thanks

 

 

Rattle Noise in Engine (Install Timing Tensioner Kit) #03-06-01-024B - (Mar 4, 2004)

 

 

1996-2003 Chevrolet Astro, Blazer, Express, S-10, Silverado

 

1996-2003 GMC Jimmy, Safari, Savana, Sierra, Sonoma

 

1996-2001 Oldsmobile Bravada

 

with 4.3L V6 Engine (VINs W, X -- RPOs L35, LU3)

 

This bulletin is being revised to change warranty information. Please discard Corporate Bulletin Number 03-06-01-024A (Section 06 -- Engine/Propulsion System).

 

Condition

Some customers may comment on a rattle-type noise coming from the engine at approximately 1800 to 2200 RPMs.

 

Cause

The spark, rattle-type noise may be caused by torsional vibration of the balance shaft.

 

Correction

If detonation noise is present , perform detonation/spark knock diagnostics first.

 

Install a new tensioner assembly kit using the procedure below.

 

Remove the engine front cover. Refer to SI for engine front cover removal procedure.

Remove the crankshaft sensor reluctor ring and line up the timing marks on the crank gear and cam shaft gear.

Remove the camshaft gear and chain. For model years 1996-1998, remove the crankshaft sprocket using J 5825-A.

Pull the shipping pin and discard. Remove the nylon timing chain tensioner blade from the timing chain tensioner bracket.

Position the bracket on the front of the engine. The upper two attaching holes of the bracket will line up with the center two engine front cover bolt holes. The lower bracket holes will line up with the engine front cover alignment holes.

 

Use a hammer and the J 46165 Pin Driver to install the dowel pins through the two lower holes in the bracket and into the engine block. Make sure that the bracket is held firmly in place before proceeding.

For model years 1996-1998, install a roller-type timing chain set. Install the crankshaft sprocket using the J 5590 Crankshaft Gear Installer.

Install the timing chain around the crankshaft sprocket and position the timing chain to the driver's side of the engine.

 

Install the nylon timing chain tensioner guide onto the timing chain tensioner bracket pin and position the top of the guide under the tab at the top of the bracket.

Install the camshaft sprocket into the chain and then to the camshaft. Install the bolts finger-tight. Make sure the timing marks are aligned, then tighten the camshaft sprocket bolt.

 

Tighten

Tighten the bolt to 25 N·m (18 lb ft).

 

Install the crankshaft reluctor ring.

 

Install the engine front cover and place a washer under the two center cover bolts that extend through the tensioner bracket. These washers are required to maintain the proper crush on the engine front cover seal.

 

Tighten

Tighten the bolts to 12 N·m (106 lb in).

 

Parts Information

Part Number

Description

Qty

 

12458911

Chain kit

1

 

89017257

Tensioner

1

 

10220906

Oil pan gasket

1

 

88893989

O ring and gasket kit

1

 

3754587

Water pump gasket

2

 

89017259

Cover

1

 

 

Parts are currently available from GMSPO.

 

Warranty Information

For vehicles repaired under warranty, use:

 

Labor Operation

Description

Labor Time

 

J1944

Tensioner, Timing Chain - Install

 

(S-10 Blazer, Pick Up, S-15 Jimmy, Sonoma With Manual Transmission)

8.6 hrs

 

Tensioner, Timing Chain - Install

 

(S-10 Blazer, Pick Up, S-15 Jimmy, Sonoma with Automatic Transmission)

9.0 hrs

 

Tensioner, Timing Chain - Install

 

(T-10 Blazer, Pick Up, T-15 Jimmy, Sonoma and Bravada)

7.5 hrs

 

Tensioner, Timing Chain - Install

 

(Express, Savana)

4.1 hrs

 

Tensioner, Timing Chain - Install

 

(Silverado, Sierra with Four Wheel Drive)

7.5 hrs

 

Tensioner, Timing Chain - Install

 

(Astro, Safari With All Wheel Drive)

7.5 hrs

 

Tensioner, Timing Chain - Install

 

(Astro, Safari)

3.9 hrs

 

Tensioner, Timing Chain - Install

 

(Silverado, Sierra)

3.9 hrs

 

Add

To Replace Crankshaft Gear

0.2 hr

 

Add

To Clean Parts On Vehicle over 48,280 km (30,000 mi)

0.1-0.3 hr

 

Add

With Skid Plate

0.2 hr

 

Add

With A/C

0.2 hr

 

 

 

 

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer".  They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle.  Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely.  If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition.  See your GM dealer for information on whether your vehicle may benefit from the information.

  WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

 

 

© Copyright General Motors Corporation.  All Rights Reserved.

 

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