How to remove the Timing Chain and Variable Timing Sprocket on 4.3L V6 engine on Chevrolet Avalanche?

To remove the timing chain cover, you need to first detach the negative cable from the battery and drain all the coolant. Afterwards, take out cooling fan, water pump, drive belt pulley and vibration damper. Then remove crankshaft position sensor and wiring harness nut. Remove oil pan then disconnect wiring harness clips from front cover. Remove crankshaft position sensor and camshaft position sensor with its jumper wiring harness. Afterward, remove the cover bolts and separate timing chain cover from block. Remove crankshaft position sensor reluctor ring and check timing chain free play. When needed replace the chain as well as sprockets. Be sure to align sprocket timing marks as well as release timing chain tensioner. To install timing chain cover clean engine block sealing surfaces then line up keyway on crankshaft sprocket. Press sprocket onto crankshaft while aligning balance shaft gears on opposite ends of shafts. Position crankshaft comparison camshaft sprocket in a way that allows passage of a looped chain over it. Apply thread locking compound onto camshaft sprocket bolt threads then tighten them up. Install crankshaft position sensor reluctor ring and apply RTV sealant to engine block sealing surface. Place new front cover and oil seal assembly in place plus tighten down on retaining bolts of cover afterward screws are tightened except for one at each end of upper edge of front plate where the attachment is made at an angle toward middle). Finally put back oil pan, vibration damper and then crankshaft position censor.

Genuine Chevrolet Avalanche Variable Timing Sprocket

Timing Gear Sprocket

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4 Variable Timing Sprockets found

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Chevrolet Avalanche Camshaft Sprocket
Part Number: 12591689
$24.65 MSRP: $40.78
You Save: $16.13 (40%)
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Product Specifications
- Other Name: SPROCKET, Engine Camshaft; Camshaft Gear, Timing Gear
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007-2009 Chevrolet Avalanche | 1/2 TON | 8 Cyl 5.3L, 8 Cyl 5.3L Flex
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Chevrolet Avalanche Camshaft Sprocket
Part Number: 12589766
$42.59 MSRP: $67.01
You Save: $24.42 (37%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: SPROCKET, Engine Camshaft; Camshaft Gear
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2004-2006 Chevrolet Avalanche | 3/4 TON | 8 Cyl 8.1L
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Chevrolet Avalanche Camshaft Sprocket
Part Number: 12576407
$34.72 MSRP: $59.89
You Save: $25.17 (43%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: SPROCKET, Engine Camshaft; Camshaft Gear, Sprocket, Timing Gear Set
- Replaces: 12552953
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2002-2006 Chevrolet Avalanche | 1/2 TON | 8 Cyl 5.3L, 8 Cyl 5.3L Flex
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Chevrolet Avalanche Camshaft Sprocket
Part Number: 12572762
Product Specifications
- Other Name: SPROCKET, Engine Camshaft; Camshaft Gear
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2002-2003 Chevrolet Avalanche | 3/4 TON | 8 Cyl 8.1L

Chevrolet Avalanche Variable Timing Sprocket

The Chevrolet Avalanche Variable Timing Sprocket lets the 5.3 liter V8 breathe at its optimal by precisely phasing the camshaft in relation to the crank. Working with the timing chain and matched cam and crank gears, the Variable Timing Sprocket carries multiple keyways and sometimes offset bushings that give Avalanche owners the freedom to advance or retard cam timing by a few degrees. Such fine adjustment is vital because even a two degree misalignment can rob the Chevrolet engine of close to fifty horsepower, so lining up factory marks alone is not enough for anyone chasing optimized output. Instead, installers fit a degree wheel, select the proper keyway or bushing on the Variable Timing Sprocket, and dial the cam to exact specifications or purposely shift it forward for stronger low-end pull or backward for higher peak rpm power. On overhead cam variants, new tensioners and chain guides accompany the Variable Timing Sprocket during service so every component shares equal wear and maintains tight control over valve events. Across the production run, Chevrolet offered the Avalanche with a single style of Variable Timing Sprocket that follows this adjustable, chain-driven layout, though later performance packages emphasized its tunability while base versions simply kept stock alignment.

Each OEM Chevrolet Avalanche Variable Timing Sprocket we offer is competitively priced and comes with the assurance of the manufacturer's warranty for the part. Furthermore, we guarantee the speedy delivery of your orders right to your doorstep. Our hassle-free return policy is also in place for your peace of mind.

Chevrolet Avalanche Variable Timing Sprocket Parts Questions & Experts Answers

Camshaft Sprocket
12591689
Q: How to remove the Timing Chain and Variable Timing Sprocket on 4.3L V6 engine on Chevrolet Avalanche?
A:
To remove the timing chain cover, you need to first detach the negative cable from the battery and drain all the coolant. Afterwards, take out cooling fan, water pump, drive belt pulley and vibration damper. Then remove crankshaft position sensor and wiring harness nut. Remove Oil Pan then disconnect wiring harness clips from front cover. Remove crankshaft position sensor and camshaft position sensor with its jumper wiring harness. Afterward, remove the cover bolts and separate timing chain cover from block. Remove crankshaft position sensor reluctor ring and check timing chain free play. When needed replace the chain as well as sprockets. Be sure to align sprocket timing marks as well as release timing chain tensioner. To install timing chain cover clean engine block sealing surfaces then line up keyway on crankshaft sprocket. Press sprocket onto crankshaft while aligning balance shaft gears on opposite ends of shafts. Position crankshaft comparison camshaft sprocket in a way that allows passage of a looped chain over it. Apply thread locking compound onto camshaft sprocket bolt threads then tighten them up. Install crankshaft position sensor reluctor ring and apply RTV sealant to engine block sealing surface. Place new front cover and oil seal assembly in place plus tighten down on retaining bolts of cover afterward screws are tightened except for one at each end of upper edge of front plate where the attachment is made at an angle toward middle). Finally put back oil pan, vibration damper and then crankshaft position censor.