Car Engine Toyota timing sprocket Suppliers

What We Manufacture in the Toyota Timing Sprocket Range

Our Toyota timing sprocket range covers crankshaft sprockets, camshaft sprockets and VVT-i controller sprockets for the ZR, AR, NR and related Toyota engine families. Each part is produced to the tooth count, bore class and keyway position required by the original drive, so it can be fitted as a direct replacement without modifying the shaft or chain.

Application Fit Across Toyota Engine Families

Toyota timing sprockets are not interchangeable across engine families even when tooth counts look similar. The variables that decide fit are the chain pitch, the shaft diameter and the phase relationship between keyway and tooth position. We group our range by engine family so the correct sprocket can be selected from the vehicle and engine code rather than from a photograph.

• ZR series (1ZR, 2ZR, 3ZR): VVT-i intake sprockets where lock-pin bore wear produces the characteristic cold-start rattle.
• AR series (2AR, 2GR-related drives): higher-torque cam drives that demand consistent surface hardness across the tooth flank.
• NR and compact engines: small-pitch sprockets where pitch accuracy has a proportionally larger effect on timing scatter.
• Diesel and commercial Toyota engines: heavier single and double-row sprockets for higher chain tension.

Material, Heat Treatment and the Specifications That Matter

We machine Toyota timing sprockets from quality alloy steel with high carbon and chromium content, then induction harden the tooth zone within a defined surface range. Material grade and heat treatment decide how long the tooth flanks hold their shape; if hardness is too low the flanks deform and the effective pitch grows, and if the structure is too brittle the teeth chip under impact.

VVT-i Sprocket Wear and the Cold-Start Rattle

On Toyota ZR and AR engines, the rattle heard immediately after start-up usually originates inside the intake cam sprocket rather than in the chain. The spring-loaded lock pin holds the sprocket in its home position until oil pressure takes over; over time the pin bore elongates, the pin no longer locks securely on shutdown, and the internal vanes slap against the housing on the next start.

We address this by honing the lock-pin bore to a high-precision fit and by maintaining tooth geometry through induction hardening. External teeth on a worn sprocket also develop a hooked profile, which changes the effective pitch and accelerates chain wear. Replacing the sprocket as part of a complete timing system overhaul is the practical route, and we supply the matching chain, tensioner and guide from the same programme.

Quality Control and Batch Acceptance

Inspection runs after every process, and finished sprockets receive 100% inspection against the customer's requirements and the applicable standard. Our testing laboratory includes spectrometer, metallographic microscope, tension tester, low temperature tester, X-ray tester, MPT, UT, CMM and video measurement equipment, which lets us verify chemical composition, mechanical properties, non-destructive soundness and dimensional accuracy on the same batch.

• Tooth flank condition checked for peening, pitting and rolled edges
• Bore and keyway verified with bore gauges and pin gauges
• Runout measured on V-blocks with a dial indicator
• Surface hardness confirmed against the declared range
• Chain seating tested with a wrapped length of the matching chain

Customization, Packaging and Delivery Scope

Our R&D team develops and produces sprockets from customer drawings or physical samples, which suits private-label programmes and applications where the original part number must be matched exactly. We hold two manufacturing factories and an in-house international sales department, so production and export documentation are handled by the same organisation.

Annual production capacity exceeds 5,000,000 single parts, which covers both repeat programme orders and mixed containers. Goods ship by sea from Ningbo and Shanghai, with air freight from the nearby Ningbo and Shanghai airports when a schedule is tight. Payment terms are confirmed at quotation, with FOB, CIF and CNF available; mass production typically runs on 30% deposit with the balance against copy of documents.

Related Timing System Products We Supply

A sprocket is only one interface in the timing drive. We supply the complete set so that pitch, tension and wear behaviour are matched across components rather than assembled from mixed sources.

• Toyota K3Ve Car Engine Timing Chain Kit — matched chain, tensioner and guide set for the same engine family.
• Universal Timing Chain Kit 0121 — a reference point for our kit configuration and component packaging.
• Chevrolet 2.4 Car Engine Timing Chain Kit — an example of our multi-brand coverage for distributors carrying several franchises.

Information We Use to Configure Your Solution

A Toyota timing sprocket proposal is prepared from the working point of the engine and the way the part will be sold, not from a generic catalogue entry. The following inputs let us confirm the correct sprocket and quote without a second round of questions.

Frequently Asked Questions

Can a worn Toyota timing sprocket damage the engine?

Yes. If the VVT-i sprocket fails to lock correctly, valve timing becomes erratic, which shows up as rough idling and reduced fuel economy. Continued operation increases vibration through the chain and can lead to a skipped tooth or chain failure. We recommend replacing the sprocket as part of a complete timing system overhaul.

How do you ensure the precision of your Toyota VVT-i sprockets?

We machine from high-carbon chromium alloy steel, hone the lock-pin bore to a high-precision fit, and induction harden the tooth zone within a defined surface range. Production follows GB/T14212-2003 and JB/T10348-200, with inspection after every process and 100% inspection of finished parts.

Do you supply the matching chain, tensioner and guide with the sprocket?

We do. Our programme covers chains, sprockets, tensioners and guides for the same engine families, so a timing drive can be supplied as a matched set. This avoids the pitch and wear mismatches that appear when components are sourced separately.

Can you produce Toyota timing sprockets to our own drawing or sample?

Yes. Our R&D team develops and produces parts from customer drawings or physical samples, which is how we handle private-label programmes and applications where an exact original part number must be matched.

What is your production capacity and how do you ship?

Annual production capacity exceeds 5,000,000 single parts across three branches covering 12,000 square meters. Goods normally ship by sea from Ningbo and Shanghai, with air freight available from the nearby airports when a schedule is urgent.

Which markets do you currently supply?

Our timing system products are exported to more than 20 countries, including the United States, Germany, Russia, Uruguay and Algeria. We exhibit at Automechanika and other international auto parts shows, and we reply to enquiries within 12 hours on working days.