Quick Answer：This guide helps fleet maintenance managers, aftermarket distributors, and truck parts buyers identify, match, and source the correct camshaft and valvetrain components for heavy-duty diesel engines. Volgen Power supplies camshafts, gears, bearings, rocker arms, sensors, and related timing/valvetrain parts for Cummins, Volvo, Scania, Mercedes-Benz, MAN, and other commercial diesel engines. All components are verified by OEM number, engine model, and serial number before quotation.
Table of Contents
What Are You Actually Ordering? Know Your Component
Before requesting a quotation, confirm which component your engine needs. Each part requires different identification information.
| Component | Information Required to Match |
|---|---|
| Complete camshaft | OEM number, casting number, engine model, cam lobe configuration (intake/exhaust/brake profile) |
| Camshaft gear | Number of teeth, timing mark position, bore diameter, mounting type (bolt-on/press-fit), keyway |
| Camshaft bearing/bushing | Inner diameter, outer diameter, width, installation position (journal #1, 2, 3…) |
| Thrust plate/spacer | Mounting hole pattern, thickness, OEM number |
| Rocker arm assembly | Intake/exhaust/brake rocker, roller or flat contact surface, shaft diameter, engine model |
| Valve tappet/follower/pushrod | Roller or flat face design, position (intake/exhaust), outer diameter, overall length |
| Camshaft position sensor | Connector type, pin count, mounting location, OEM number, sensor type (inductive or Hall-effect) |
| VVA / VEB / VVB / compression brake component | Engine generation, emission standard (EPA 07/10/13/21, Euro 5/6/7), system type, OEM part number |
| Cam phaser (variable valve timing actuator) | Only for engines confirmed to use variable cam timing — Scania Super 11L, select Cummins/Volve EPA 2021+ platforms. Verify engine family and OEM documentation before sourcing. |
| Timing gear / idler gear / intermediate gear | Gear position in the drivetrain, tooth count, mating idler and bearing part numbers |
Submitting the correct identification information with your inquiry reduces matching errors and speeds up the quotation process.
Camshaft Phaser vs. Heavy-Duty Diesel VVA: Understand the Difference
A common misconception is that all modern heavy-duty diesel engines use a camshaft phaser (variable valve timing actuator) similar to passenger gasoline engines. In reality, heavy-duty diesel engines use several different approaches to valve management:
| System Type | Examples | Key Characteristics |
|---|---|---|
| Fixed camshaft timing (gear-driven) | Cummins ISX15 (pre-2017), older Scania DC, MAN D20/D26 | No phaser. Camshaft driven directly by timing gears. Fixed valve timing. |
| Cam phaser (hydraulic VVT) | Scania Super 11-litre, select Cummins/Volve EPA 2021+ models | Hydraulic actuator at camshaft front. Adjusts cam timing within a limited range. Oil pressure dependent. |
| Variable Valve Actuation (VVA) | Eaton VVA on select Cummins, Volvo platforms | Electronic/hydraulic system that can vary valve lift, timing, or deactivate cylinders. Not a cam phaser. |
| DOHC fixed timing (gear-driven) | Scania Super 13-litre, newer MAN D15/D26 | Separate intake and exhaust camshafts. Fixed timing. No phaser on both camshafts. |
According to Eaton, their heavy-duty VVA technology supports features such as intake valve late closing, cylinder deactivation, and exhaust valve reopening — capabilities that go beyond a traditional cam phaser. Scania states that its Super 11-litre engine uses a cam phaser, while the Super 13-litre uses DOHC without a phaser.
Bottom line: Do not assume a cam phaser replacement is needed. Confirm the valvetrain architecture by engine family, serial number, and emission generation before ordering.
Common Heavy-Duty Camshaft Applications
The table below lists camshaft products currently available through Volgen Power with verified OEM references. Additional applications can be matched by engine model and OEM number.
| Engine Platform | Component | OEM Reference | Action |
|---|---|---|---|
| Volvo D13 | Camshaft | 20742610 / 23289179 | View product → |
| Volvo D11K | Camshaft | 21745877 | View product → |
| Volvo D11 | Camshaft | 21189194 | View product → |
| Cummins engines | Camshaft & valvetrain parts | By engine serial number | Request OEM matching → |
| Mercedes-Benz engines | Camshaft & valvetrain parts | By OEM number | Request OEM matching → |
| Scania engines | Camshaft & valvetrain parts | By engine serial number | Request OEM matching → |
| MAN engines | Camshaft & valvetrain parts | By OEM number | Request OEM matching → |
For other heavy-duty diesel engine components including cylinder blocks, cylinder heads, crankshafts, and connecting rods, browse our product categories or send your engine model and OEM number for verification.
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4059893 Cummins QSM11/M11/ISM11 OEM Camshaft
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Cummins 4334460 Camshaft for QSK23 Engine
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Single Camshaft or Complete Valvetrain Package?
One of the most common questions from buyers is whether to replace just the camshaft or the entire valvetrain system. The answer depends on the engine’s condition and maintenance history:
- Single camshaft replacement — Suitable when a specific failure (broken lobe, worn journal, bent shaft) is isolated, and the remaining valvetrain components are within service limits.
- Camshaft + gear set — Recommended when the timing gear shows wear or when the camshaft gear is not available separately.
- Complete valvetrain package — Recommended for engine overhaul or rebuild situations, including camshaft, bearings, tappets, pushrods, rocker arms, and seals.
Volgen Power can supply individual components or a complete valvetrain package depending on your engine’s needs. Include your rebuild scope when submitting an inquiry.
OEM Matching Checklist
To ensure accurate component matching, prepare the following information before submitting a quotation request:
- Engine manufacturer and model
- Engine serial number (ESN) — stamped on the engine block data plate
- Vehicle or equipment VIN (where available)
- OEM part number from the existing component
- Casting or forging number from the original part
- Emission standard (EPA 07/10/13/21, Euro 5/6/7, China VI)
- Clear photo of the existing part (showing markings, connector, mounting points)
- Photo of the engine nameplate, if the OEM number is missing
For a detailed breakdown of what information each component requires, refer to the component identification table in Section 1 above.
When Related Components Should Be Inspected
Replacing the camshaft without inspecting related components can lead to early failure of the new part. The following should be evaluated:
| Component | Inspection Criteria |
|---|---|
| Timing gears or chain set | Gear tooth wear, backlash, chain stretch measurement, sprocket condition |
| Camshaftbearings/bushingss | Inner diameter wear, surface scoring, oil clearance |
| Valve tappets/followers | Roller condition (if applicable), face wear pattern, stem OD |
| Pushrods (if applicable) | Straightness, end wear, oil passage condition |
| Rocker arms and shafts | Contact pad wear, shaft bore clearance, valve lash adjuster condition |
| Camshaft position sensor | Sensor tip contamination, signal output at cranking speed, wiring integrity |
| Lubrication system | Oil pressure at operating temperature, oil quality, oil control valve (where applicable) |
Quality Inspection Requirements
When evaluating camshaft and valvetrain components, the following quality parameters should be verified with the supplier:
- Material — Forged steel, induction-hardened cast iron, or assembled camshaft design as per OEM specification
- Journal dimensions — Diameter, roundness, and surface finish at each bearing journal
- Cam lobe profile — Lobe height, contour geometry, and position relative to timing marks
- Surface treatment — Hardening method (induction, nitriding, carburizing) and effective case depth
- Total runout — Camshaft straightness and journal concentricity
- Non-destructive testing — Magnetic particle inspection for surface cracks
- Hardness verification — Lobe surface and journal hardness per OEM specification
- Packaging — Corrosion protection, individual wrapping, export-grade crating
Specific acceptable values for hardness, dimensions, and runout depend on the engine model and OEM specification. Request the supplier’s quality documentation for the specific part number you are sourcing.
How to Compare Camshaft Suppliers
When selecting a heavy-duty diesel camshaft supplier, verify the following before placing an order:
| Criteria | What to Confirm |
|---|---|
| OEM matching process | Is the part verified by OEM number, engine serial number, and emission generation? |
| Quality grade available | Genuine OEM, OEM-quality aftermarket (OE spec), or standard replacement? |
| Inspection documentation | Are hardness, dimension, and crack inspection reports available for each batch? |
| Inventory status | Is the part in stock, or is a production lead time required? |
| Minimum order quantity (MOQ) | Single-piece or batch minimums? Available for wholesale orders? |
| Lead time | Stock dispatch time and production lead time for non-stocked items |
| Warranty | Standard warranty period and coverage terms |
| Packaging and shipping | Export packaging standard, shipping methods (air/sea/express), Incoterms |
Request Compatibility Check
To request a quotation or OEM matching check, send us:
- Engine manufacturer, model, and serial number
- OEM part number or casting number
- Emission year/standard
- Required component type (camshaft, gear, sensor, bearing, rocker, etc.)
- Quantity required
- Destination country
- Quality preference (genuine / OEM-quality aftermarket/standard)
- Photo of the existing part, if available
No OEM number available? Send us the engine nameplate photo, photos of the old part, and the vehicle VIN. Our parts team will verify compatibility before quotation.
Send your inquiry for camshaft and valvetrain components →
Procurement FAQs
Can you match a camshaft if I only have the engine serial number?
Yes. In many cases, the engine serial number is sufficient to identify the correct camshaft, especially when combined with the emission year and OEM number from the existing part.
Do you supply camshafts for older engine models?
We can check availability for most Cummins, Volvo, Scania, Mercedes-Benz, and MAN diesel engines. Send the OEM number or engine details for verification.
What is your minimum order quantity for camshafts?
MOQ varies by product and stock status. Single-piece orders are accepted for in-stock items. Bulk/wholesale pricing is available for volume orders.
How long does shipping take?
Lead time depends on stock status and destination. Typical air freight: 5–10 business days. Sea freight: 20–40 days. Express courier: 3–7 business days.
Can you supply complete valvetrain kits?
Yes. We can assemble a complete valvetrain and timing system package based on your engine’s requirements. Include your rebuild scope in the inquiry.
