Gates VCP858 VVT sprocket for the 2002-2004 Chevrolet Trailblazer 6-cylinder 4.2L and other vehicles rotates the sprocket position to advance or retard valve timing. Also called an engine variable valve timing vvt sprocket, it is commonly known as a cam phaser or cam actuator.
- Tooth profile built for quiet operation, with 58 teeth
- Steel construction for durability and service life
- Single chain row for timing chain drive
- Tested to help restore engine performance and fuel economy and reduce emissions
Quick facts
- Part: Gates VCP858 VVT sprocket
- Also called: engine variable valve timing vvt sprocket
- Fits: 2002-2004 Chevrolet Trailblazer 6-cylinder 4.2L and other vehicles
- Material: Steel
- Condition: New
A worn VVT sprocket can show up as rough idle, reduced power or a timing-related warning light, though the oil control solenoid or the timing chain can be behind the same signs, so find the cause before replacing it. The engine takes a single sprocket.
Fits
It is listed for a wide range of Chevrolet, GMC, Buick, Isuzu and Oldsmobile models, including the 2002-2004 Chevrolet Trailblazer EXT 6-cylinder 4.2L and the 2002-2004 GMC Envoy 6-cylinder 4.2L, as a direct-fit replacement. Open the "Vehicles it fits" section to check your exact model and engine.
Specifications
Fit and size
- Quantity per vehicle: 1
- Outside diameter: 5.88 in
- Height: 2.59 in
- Tooth quantity: 58
- Tooth thickness: 0.16 in
- Chain row quantity: 1
- Mounting hole quantity: 1
Build and materials
- Material: Steel
- Drive type: Timing chain
- Condition: New
- Country of origin: China
In the box
One VVT sprocket. Mounting hardware is not included, so plan on new bolts.
Interchange: 7V-1001P · 917-255
19179010 · 25178506 · 8191790100 · 8251785060 · CSP1015
This part cross-references / interchanges with the following part numbers:
7V-1001P, 917-255, 19179010, 25178506, 8191790100, 8251785060, VCP858, CSP1015
Frequently Asked Questions
Does the Gates VCP858 VVT sprocket fit a 2002-2004 GMC Envoy 6-cylinder 4.2L?
Yes. Gates VCP858 is listed for the 2002-2004 GMC Envoy 6-cylinder 4.2L. The "Vehicles it fits" section shows the other models it fits.
Does this VVT sprocket come with mounting bolts?
No. Mounting hardware is not included; the box holds one VVT sprocket, so plan on new bolts.
How many teeth does the Gates VCP858 sprocket have?
Gates VCP858 has 58 teeth, 0.16 in tooth thickness and one chain row. It is made for timing chain drive and measures 5.88 in across.
What can a failing VVT sprocket sound or feel like?
Signs can include rough idle, reduced power or a timing-related warning light. A shop can test cam timing with the right equipment.
Is part number 917-255 the same as Gates VCP858?
Yes. 917-255 is listed as a number that Gates VCP858 replaces, along with the other numbers on the Interchange line.
