Rocker Arm Assembly 12420479 (Genuine DEUTZ/MWM Part)

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Fitting Clearance between Rocker Arm and Shaft	0.015–0.040 mm
Packaging Details	Original packaging
Contact Surface Width at Valve End	12 mm
Delivery Time	15days
ocker Ratio	1.75:1, amplifying cam lift to increase valve opening stroke
Unit Weight	Approx. 1.2 kg per piece
Shaft Diameter (Bushing Inner Diameter)	φ16 mm
Adjusting Screw Specification	M9×1
Payment Terms	T/T,Western Union
Supply Ability	9999
Place of Origin	Germany
Brand Name	MWM DEUTZ
Model Number	12420479

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Product Specification


Fitting Clearance between Rocker Arm and Shaft	0.015–0.040 mm	Packaging Details	Original packaging
Contact Surface Width at Valve End	12 mm	Delivery Time	15days
ocker Ratio	1.75:1, amplifying cam lift to increase valve opening stroke	Unit Weight	Approx. 1.2 kg per piece
Shaft Diameter (Bushing Inner Diameter)	φ16 mm	Adjusting Screw Specification	M9×1
Payment Terms	T/T,Western Union	Supply Ability	9999
Place of Origin	Germany	Brand Name	MWM DEUTZ
Model Number	12420479

Part No. 12420479 is a valve rocker arm assembly for DEUTZ MWM gas engine series. It is a genuine original part matched with the valve train including valves, valve seat inserts, valve guides, valve stem seals and valve springs.

1. Basic Information

Part Number: 12420479
Name: Rocker Arm Assembly
Brand: DEUTZ / MWM
Applicable Models:

DEUTZ MWM TBG/TCG 2020/2032 series gas engines

DEUTZ TCG 620 V12/V16/V20 series

BF6M1013, BF4M2012 industrial, power generation and marine engines
Applicable Valves: Universal for intake and exhaust valves (valve stem diameter: φ8 mm)
Function: Core component of the valve train, transmitting thrust from the camshaft to drive valve opening and closing.

2. Material & Manufacturing Process

Main Body Material: Alloy cast iron / Ductile iron, featuring high strength, high rigidity and excellent impact resistance.
Bushing Material: Copper-tin based alloy (CuSn) with self-lubricating property, outstanding wear resistance and low friction.
Heat Treatment: Overall quenching and tempering plus high-frequency quenching on working surfaces. Hardness: HRC 52–58.
Surface Treatment: Black oxide / Phosphating for rust prevention and resistance to oil and gas corrosion.
Operating Temperature: -40℃ ~ +450℃, suitable for high-temperature service of gas engines.

3. Key Dimensions (Original Standard)

Rocker Ratio: 1.75:1, amplifying cam lift to increase valve opening stroke
Shaft Diameter (Bushing Inner Diameter): φ16 mm
Fitting Clearance between Rocker Arm and Shaft: 0.015–0.040 mm
Contact Surface Width at Valve End: 12 mm
Adjusting Screw Specification: M9×1
Unit Weight: Approx. 1.2 kg per piece

4. Functions & Features

Precise Power Transmission: Optimized rocker ratio ensures accurate valve timing and stable valve lift.
Long Service Life: Combination of alloy cast iron and copper bushing delivers great resistance to alternating loads and wear.
Adjustable Clearance: Equipped with M9 adjusting screw and lock nut for precise control of valve lash.
High Temperature Stability: Resists thermal deformation and carbon deposition, free from sticking during long-term operation of gas engines.
Reliable Lubrication: Built-in oil passage provides forced lubrication for bushings and contact surfaces to reduce wear.

5. Replacement & Compatibility

Genuine Alternative Part No.: 12420479 (No updated replacement part)
Recommended Aftermarket Brands: ELRING, INA, CTP. The rocker ratio, shaft diameter, material and adjusting screw specification must be fully matched.

6. Installation Instructions

Inspection & Cleaning: Check the rocker arm for cracks and deformation, and confirm the bushing is firmly fitted. Ensure all oil passages are unobstructed.
Fitting Clearance: Maintain the clearance between rocker arm and shaft within 0.015–0.040 mm. Replace the bushing if the tolerance is out of range.
Installation Sequence: Install the rocker shaft first, then fit the rocker arm and mount the adjusting screw.
Valve Lash (Cold State): 0.25–0.30 mm for intake valves; 0.35–0.40 mm for exhaust valves.
Tightening Torque: Lock nut of adjusting screw: 20±5 Nm; Rocker shaft bolt: 40±5 Nm.
Complete Replacement: Replace together with valves, valve seat inserts, valve guides, valve stem seals and valve springs to ensure reliable performance of the entire valve train.

Company Details

Bronze Gleitlager

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Business Type:

Trading Company,Seller,Exporter,Importer,Distributor/Wholesaler,Manufacturer,Agent 
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Year Established:

2023 
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Total Annual:

CNY 20M-CNY 50M
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Employee Number:

10~49 
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Ecer Certification：

Verified Supplier 

Chengzai Machinery mainly operates products suitable for imported brands of road machinery, mining equipment, construction machinery, generator sets, ship power systems, etc.: drilling rig spare parts, air compressor spare parts, tunneling machine spare parts, excavator-loader spare parts, engine sp... Chengzai Machinery mainly operates products suitable for imported brands of road machinery, mining equipment, construction machinery, generator sets, ship power systems, etc.: drilling rig spare parts, air compressor spare parts, tunneling machine spare parts, excavator-loader spare parts, engine sp...

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