Car Engine Mitsubishi timing sprocket Suppliers

Mitsubishi Timing Sprockets We Manufacture

Our Mitsubishi timing sprocket line covers 11 active part numbers for the 4G6 family and related Mitsubishi engine platforms. Each sprocket is machined from high-carbon chromium alloy steel and heat treated to a defined surface hardness range. We produce both intake and exhaust camshaft sprockets as separate, clearly labeled parts.

The range includes sprockets for the 4G63 DOHC turbo (Lancer Evolution, Galant VR-4) and 4G64 SOHC naturally aspirated (Galant, Delica, L200) configurations. These are not interchangeable: tooth count, keyway angle, hub bore and chain width differ between the two engine codes. We maintain segregated inventory and separate production lines for each variant.

Product Range at a Glance

Application Fit and Engine Coverage

Mitsubishi timing sprockets are used across passenger cars, light commercial vehicles and performance applications. The 4G63 DOHC turbo sprocket must withstand higher valve spring loads (approximately 1,600 N chain tension) and higher operating temperatures than the 4G64 SOHC variant (approximately 1,100 N). We apply deeper carburization to the turbo sprocket to match these conditions.

• 4G63 DOHC Turbo: Lancer Evolution I–IX, Galant VR-4, RVR — 38T intake and exhaust sprockets, 7.0 mm chain contact width
• 4G64 SOHC NA: Galant, Delica, L200, Hyundai clones — 40T single camshaft sprocket, 8.0 mm chain contact width
• 4B11 / 4B12: Lancer, Outlander — variable valve timing sprocket configurations
• 6G72 / 6G74: Pajero, Montero — crankshaft and camshaft sprockets for V6 applications

Critical Specifications and Material Control

Every Mitsubishi timing sprocket we produce is defined by four measurable properties: tooth profile and pitch accuracy, bore and keyway tolerance, surface hardness, and chain seating. These are the same properties that determine whether a sprocket holds timing under load for hundreds of thousands of cycles.

Quality Assurance and Inspection

We inspect every production batch against GB/T14212-2003 and JB/T10348-200 standards. Our testing lab is equipped with a spectrometer, metallographic microscope, tension tester, low-temperature tester, X-ray tester, MPT, UT, CMM and video measurement machine. Finished sprockets undergo 100% inspection for tooth count, keyway angle and hub geometry before packing.

For Mitsubishi sprockets specifically, we run a chain seating test on every batch: a known-good chain is wrapped around the sprocket and rotated by hand. Rollers must seat fully in every tooth space with no clicking or climbing. Any batch that fails this test is rejected before it reaches inventory.

Configuration Options and Customization

We produce Mitsubishi timing sprockets to standard OEM dimensions and also support customized configurations. Our R&D team can develop and produce sprockets according to customer drawings or samples. Customization options include:

• Tooth count and pitch diameter adjustments for non-standard applications
• Keyway width, depth and offset angle modifications
• Hub bore diameter and bolt hole pattern changes
• Material grade selection and heat treatment profile adjustments
• Surface finish and coating options for corrosion resistance

For projects requiring a complete timing system, we also supply Mitsubishi Timing Chain Kit 11 components including chains, tensioners and guides matched to the sprocket specifications.

Installation, Maintenance and Serviceability

Mitsubishi timing sprockets are installed behind the timing cover and are not serviceable without disassembly. Correct installation requires verifying the engine code stamped on the block, confirming the camshaft nose diameter (22.0 mm for DOHC, 24.0 mm for SOHC), and aligning the keyway with the camshaft woodruff key. We supply intake and exhaust sprockets as separate parts with clear labeling to prevent mix-ups during assembly.

For maintenance planning, chain engineers apply a ten-percent wear rule: when tooth wear reaches 10% of tooth thickness, the sprocket must be replaced. Worn teeth change the effective pitch and cause the chain to climb. We recommend replacing the sprocket together with the chain, tensioner and guide as a set to maintain correct timing geometry.

Information We Use to Configure Your Solution

To prepare an accurate Mitsubishi timing sprocket quotation, we need the following project information. This allows us to match the exact sprocket variant and confirm availability.

Frequently Asked Questions

Can I use a 4G63 sprocket on a 4G64 engine?

No. The 4G63 DOHC turbo sprocket has 38 teeth and a 3.0 mm keyway; the 4G64 SOHC sprocket has 40 teeth and a 4.0 mm keyway. The bore diameters differ (22.0 mm vs. 24.0 mm), and the chain contact widths are 7.0 mm and 8.0 mm respectively. These parts are not interchangeable and attempting to fit one on the other will cause timing failure.

How do I identify the correct Mitsubishi timing sprocket for my engine?

Check the engine code stamped on the front face of the block, exhaust side, just below the cylinder head. The code appears as "4G63" or "4G64". Also confirm the camshaft nose diameter: 22.0 mm indicates DOHC, 24.0 mm indicates SOHC. For 4G63 Evolution VII–IX, confirm whether MIVEC variable valve timing is equipped.

What material and hardness do your Mitsubishi sprockets use?

We machine Mitsubishi sprockets from high-carbon chromium alloy steel. The 4G63 turbo sprocket uses SCM435H with a surface hardness of 58–62 HRC and case depth of 0.8–1.2 mm. The 4G64 SOHC sprocket uses SCM420 with 52–56 HRC and 0.4–0.6 mm case depth. Both grades comply with GB/T14212-2003 and JB/T10348-200 standards.

Do you supply complete Mitsubishi timing chain kits?

Yes. We supply complete timing chain kits for Mitsubishi applications, including chain, tensioner, guide and sprocket. The Mitsubishi Timing Chain Kit 11 range covers the same engine families as our sprocket line. We also produce timing chain kits for other major brands including Toyota K3Ve Car Engine Timing Chain Kit and Nissan Yd25 Car Engine Timing Chain Kit.

What is your production capacity and lead time for Mitsubishi sprockets?

Our annual production capacity exceeds 5,000,000 single parts across all timing system components. We operate two manufacturing factories with a total floor area of 12,000 square meters and more than 100 employees, including 5 engineers and 5 technicians. Lead time depends on order quantity and current production scheduling; we confirm delivery dates when quoting.

How do you ensure batch-to-batch consistency?

We perform inspection after every process step and 100% inspection on finished sprockets for tooth count, keyway angle and hub geometry. Our testing lab runs spectrometer analysis, metallographic examination, hardness testing and chain seating checks on every batch. This ensures that a sprocket ordered today matches the dimensions and material properties of the same part number ordered six months from now.