Mitsubishi engine valve springs from Japan have high strength, fatigue resistance, precise resetting, original factory quality, stable engine power output

Mitsubishi valve springs are made of high-strength alloy material and processed with precision heat treatment technology, suitable for the original engine valve mechanism. Excellent anti fatigue performance, high and low temperature resistance, ensuring precise valve opening and closing, effectively avoiding valve abnormal noise and leakage, ensuring combustion chamber sealing, extending the life of engine core components, stabilizing power output and fuel efficiency. Ningbo Qiuning Trading Co., Ltd. Service Supply and Sales Center Our company provides more engine assemblies and accessories of different brands and models If you are interested, please add my contact information directly: WeChat/WhatsApp：+86 15888032469 E-mail： allen@perkins-rx.com Remarks: The model or serial number processing is faster and the price is more favorable We provide global logistics and delivery services, original and genuine products, support online ordering, and ensure response to customer needs within 72 hours.

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The "invisible cornerstone" of the engine valve train system - Mitsubishi valve springs from Japan
During the operation of an engine, the valve spring, though unremarkable, is the "power core" of the valve train: it precisely and elastically controls the opening and closing of the valves, directly affecting the sealing of the combustion chamber, intake efficiency and power output. Mitsubishi valve springs from Japan, with their original factory-level quality and precise design, have become key components to ensure the stable operation of engines. Their core value lies in the dual guarantee of "precise control" and "long-term reliability".
1. Original factory-level compatibility: Eliminate gas distribution disorder
As a Mitsubishi factory-certified component, its size and elastic coefficient are perfectly matched with the valve mechanism (for specific compatible models, please consult customer service). From the diameter of the spring wire to the number of turns, all have undergone tens of thousands of tests to ensure a "seamless collaboration" with the valve guide and rocker arm. Unlike the possible problems of insufficient or excessive elasticity of general springs, it can precisely control the lift and closing speed of the valves - which is directly related to the sealing performance of the combustion chamber: insufficient elasticity can easily lead to the valves not closing tightly (air leakage), while excessive elasticity increases the load on the camshaft (accelerates wear). The "customized" feature of Mitsubishi springs eliminates such hidden dangers from the source.
2. Materials and Craftsmanship: Withstanding "High-frequency tests"
When the engine is running, the valve springs need to withstand thousands of high-frequency expansions and contractions per minute (corresponding to the engine speed). Ordinary springs are prone to elastic loss and breakage due to fatigue. Mitsubishi uses high-strength alloy wires and adds elements such as silicon and manganese to enhance fatigue resistance. After multiple heat treatment processes, the spring maintains stable elasticity in a temperature difference environment ranging from -40 ℃ to 150℃. It can withstand over 10 million cycles of vibration as measured. Even under the working conditions of long-distance driving of commercial vehicles and frequent start-stop of construction machinery, it can still maintain stable performance and avoid problems such as abnormal valve noise and sudden power drop.
The implicit value of three pairs of engines
Stable valve opening and closing conceals three benefits:
Tight seal → Complete combustion → no reduction in power;
Low wear → Extended service life of valve guides and camshafts → Reduced maintenance costs;
Accurate response → Stable intake efficiency → more economical fuel consumption.
If the spring fails, at the very least, the engine will idle with shaking and weak acceleration; at worst, the valves will collide with the pistons (causing serious mechanical failure). Choosing Mitsubishi original springs is actually adding an extra layer of "insurance" to the engine's valve train system.
Maintenance suggestions: It is recommended to check the spring elasticity during the engine overhaul cycle (usually every 150,000 to 200,000 kilometers). If abnormal valve noise or power decline is detected, timely inspection and replacement are necessary. When replacing, give priority to using original factory parts to ensure the coordination of the gas distribution mechanism.

Mitsubishi S12R-PTA， S12R-PTA2，S12R-PTAA2 Engine spare parts
Number	Part description	P/N
1	Ring group, piston	37517-10010
2	Cylinder liner, cylinder	37507-82600
3	O-ring, cylinder liner	37507-32400
	O-ring, cylinder liner	37107-04201
	O-ring, cylinder liner	37107-04300
4	piston	37517-30101,37517-17700
5	Sales, piston	37517-18100
6	Gasket kit, major overhaul	37794-90270
7	Gasket, cylinder head	37501-12200
8	Seals, oil	37511-04300
9	Seals, oil	37711-04300
10	intake valve	37504-40200
11	Guidance, intake valve	37101-10600
12	Valve seat, intake valve	37501-13100
13	exhaust valve	37504-40200
14	Guide rail, exhaust valve	37101-10600
15	Valve seat, exhaust valve	37501-13100
16	Bearing group, main bearing (standard)	37709-12010
	Bearing group, main (0.25)	37709-12020
	Bearing assembly, main (0.50)	37709-12030
	Bearing group, main (0.75)	37709-12040
	Bearing assembly, main engine (1.00)	37709-12050
17	Bearings, connecting rods (standard)	37519-13100
	Bearings, connecting rods (0.25)	37519-13200
	Bearings, connecting rods (0.50)	37519-13300
	Bearings, connecting rods (0.75)	37519-13400
	Bearings, connecting rods (1.00)	37519-13500
18	Bearings, thrust (standard)	37709-28100
	Bearing, thrust (0.25)	37709-28200
	Bearing, thrust (0.50)	37709-28300
	Bearing, thrust (0.75)	37709-28400
19	Starter Big Butt	37766-20201
20	Cylinder Head Assembly	37501-80050
21	AC generator	04343-38000
22	Water pump assembly, water	37545-80011,37745-60011
23	Tip assembly, nozzle	37560-17500,37560-17700,
23	Tip assembly, nozzle	37561-17500
24	Nozzle assembly	37560-39002,37560-22012
25	Pump, feed	04245-01120
26	Pump assembly injection	48273-00005,48274-00005,
		PS6-HL-50，PS6-HR-50;
		48A50-08005，48A60-08005，
27	speed controller	04410-53100，XS-400B-03
28	Governor actuator	04410-32011，SG4017BR-01
29	Turbocharger	49182-03471,49182-03481,
		49182-03880,49182-03890,
		49182-03821,49182-03830
30	DC solenoid valve	04400-08801,04400-08901
		04400-09201
		WOODWARD 2370-24ESU1B5S
31	Pump assembly oil	37735-00031
32	Nozzle assembly	37560-39002,37560-22012
33	Triangle belt, AC generator	37768-04200
34	Oil element, full flow rate	37540-11100
35	Oil element, bass	37540-02100
36	Fuel element	32562-60300
37	Cleaning agent components, air	47220-39802,47220-47800

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Mitsubishi engine valve springs from Japan have high strength, fatigue resistance, precise resetting, original factory quality, stable engine power output