The VVT Pulley 1007301GD150 is a key transmission and adjustment part for the variable valve timing (VVT) system in JAC T8 pickup trucks. It works as the "power bridge" between the engine’s
crankshaft and camshaft, while also fine-tuning when the valves open and close to boost performance and save fuel. Even though it only weighs 0.59kg and is small enough to fit in a 15×15×8cm space, it’s super important for keeping the T8’s gasoline engines running smoothly.
It’s made specifically for 2018–present JAC T8 models that have 2.0T i-VVT gasoline engines—like the 4GA3-3D and 4GA3-4D. It works perfectly with the engine’s electronic control unit (ECU) and timing system, and no aftermarket part can match how precise it is.
This little pulley has two non-negotiable jobs in the T8’s engine: it’s both a "power transmitter" and a "timing adjuster." Here’s why that matters for everyday driving and heavy use:
Stably send power from the crankshaft: The outer teeth of the pulley fit tightly with the timing belt, sending rotational power from the crankshaft (the engine’s "main shaft") to the camshaft. This makes sure the camshaft spins in time with the pistons—without it, the valves would open or close at the wrong moment, which would make the engine misfire.
Tweak valve timing to save fuel and boost performance: Working together with the T8’s i-VVT system, the pulley changes the camshaft’s rotation angle depending on how you’re driving. When you’re accelerating (like when you need more power for passing), it moves the valve timing forward to let more air-fuel mix get into the cylinders—this boosts torque, up to 290Nm for the 2.0T engine. When you’re cruising (like on the highway with light load), it pushes the timing back to cut down on wasted fuel. Compared to engines without VVT, this lowers gas use by about 5–8%.
Keep the engine running smoothly and quietly: Its tough structure soaks up vibrations from the belt moving, stopping that "chattering" noise that wears out the timing system. This keeps the engine quiet even when it’s running at 5000rpm—that’s the 2.0T engine’s max power speed—and makes the timing belt last 20–30% longer.
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This pulley isn’t a one-size-fits-all deal—it’s made specifically to work with certain JAC T8 setups, and nothing else. Here’s the breakdown of what it fits (and what it doesn’t):
Target Models: 2018–present JAC T8 pickups with 2.0T i-VVT gasoline engines (covers Comfort, Elite, and Luxury trims). Won’t work with: T8 diesel models (like the 2.0CTI 4DB2-1D1) or other JAC trucks (such as the T6).
System Compatibility: It has to pair with the T8’s original VVT ECU and timing belt—look for original equipment (OE) part numbers that match 4GA3-series engines. Aftermarket ECUs can’t send the right oil pressure signals to the pulley, which leads to slow timing adjustments or even makes the engine stall.
Physical Fit: It’s designed for the T8’s engine bay layout—its 8cm thickness fits perfectly between the crankshaft and camshaft, no rubbing against other parts. If you try to use it on non-T8 JAC models (like the Refine S5), you’ll have to modify the mounting points—and that’ll void your engine’s warranty.
Trying to install this yourself is a surefire way to damage your engine—only JAC-approved techs (at 4S shops or certified repair centers) should handle it. Here’s why, in 3 simple points:
Timing Alignment: The pulley has to line up exactly with the camshaft’s timing marks (and the crankshaft’s too) using special JAC timing tools. Even a 1-degree off alignment will make the valves hit the pistons—and that’ll cost you thousands in repairs.
Torque Control: The mounting bolts need to be tightened to 45–50 N·m. If they’re too loose, the pulley slips; too tight, and the end of the camshaft cracks. Techs use torque wrenches to get it just right—no guesswork.
System Reset: After installation, the ECU has to be reprogrammed with JAC’s diagnostic tool. This lets the ECU learn how the new pulley works—skip this, and the VVT system won’t adjust timing correctly at all.
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Summary
Bottom line, the VVT Pulley 1007301GD150 is a total unsung hero for the JAC T8’s gasoline engine. It keeps the power delivery nice and smooth, keeps fuel costs down, and keeps the engine in good shape—but that’s only if you stick with the original part and have pros install it. Don’t bother with those cheap aftermarket alternatives—your T8’s engine isn’t worth taking a risk on.
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