Product Analysis: 37507-22701 Cylinder Liner Suit for Mitsubishi S6R / S12R / S16R Diesel Engine
1. Basic Specifications & Parameters
The Cylinder Liner 37507-22701 is a heavy-duty wet-type cylinder sleeve engineered for Mitsubishi’s S6R, S12R, and S16R series diesel engines. These engines are widely used in high-power generator sets, marine propulsion, and industrial applications where reliability under continuous full load is critical.
This liner is manufactured to withstand extreme cylinder pressures and thermal stresses, featuring advanced metallurgy and precision finishing.
Key technical parameters:
Part Number: 37507-22701
Liner Type: Wet liner (coolant flows around the outer wall)
Material: High-alloy centrifugally cast iron (containing nickel, chromium, molybdenum)
Hardness: HB 230 – 280 (optimized for high ring pressure applications)
Surface Finish: Plateau honed with cross-hatch pattern, Ra 0.30 – 0.55 μm
Bore Diameter (nominal) : 170 mm (OEM specification for S6R/S12R/S16R)
Flange Diameter (top ): 195 mm
Overall Length: 385 mm (suits deep skirt design of S6R family)
Lower Outer Diameter (below sealing grooves): 178 mm
Number of O‑ring grooves: 3 lower (for coolant sealing) + 1 upper (fire ring groove)
Coolant side protection: Anti-cavitation & anti-pitting coating (tin-based or epoxy)
Weight per liner: Approximately 22.5 kg (49.6 lbs)
Each liner is 100% inspected for bore roundness (≤0.03 mm), straightness (≤0.04 mm), and hardness uniformity. Hydrostatic pressure tested to 8 bar (116 psi) for coolant-side integrity.
2. Compatible Engines & Applications
The 37507-22701 cylinder liner is a direct replacement for the following Mitsubishi engine families:
Mitsubishi S6R – 6-cylinder in-line, turbocharged and aftercooled. Common in generator sets (500 kW – 900 kW), marine main engines for workboats, and large industrial pumps. Sub-models include S6R2, S6R-YPTA, S6R-MPTA.
Mitsubishi S12R – 12-cylinder V-configuration, producing 1000 kW – 2000 kW. Used in prime power generators for data centers, hospitals, and marine auxiliary engines on large vessels.
Mitsubishi S16R – 16-cylinder V-configuration, rated up to 2500 kW+. Typical applications include power plants, mining haul trucks, and main propulsion for tugboats and ferries.
Key applications requiring this liner:
Standby & prime diesel generator sets (Mitsubishi branded or aftermarket assembled)
Marine propulsion (tugboats, fishing trawlers, coastal freighters)
Marine auxiliary engines (onboard power generation)
Heavy earthmoving equipment (large excavators, wheel loaders)
Locomotive engines (some Mitsubishi-powered shunting locomotives)
Note: Although the bore diameter (170 mm) is identical across S6R, S12R, and S16R, the liner itself is a single cylinder component. An S12R engine requires 12 liners, while an S16R requires 16 liners. Always verify the original liner part number stamped on the old unit before ordering.
3. Performance Advantages & Functional Improvements
Choosing the 37507-22701 cylinder liner from a quality aftermarket source like Rsolid Engine Parts delivers measurable improvements over worn or low-grade alternatives:
Enhanced Wear Resistance – The nickel-chromium-molybdenum alloy iron provides exceptional resistance to ring groove wear and scuffing. Expect up to 15,000–18,000 operating hours under proper maintenance, which is 25% longer than standard cast liners.
Superior Heat Dissipation – As a wet liner, coolant directly contacts the outer wall. Our liners feature a micro-textured outer surface (no casting scale) that promotes nucleate boiling, reducing cylinder wall temperature by 18–22°C. Cooler operation prevents oil carbonization and ring sticking – a common issue in high-load generator engines.
Reduced Oil Consumption & Blow‑by – The plateau honed finish (Ra ≤0.55 μm) with a cross-hatch angle of 35–45° ensures rapid ring seating and optimal oil film retention. Field data shows 20–30% lower oil consumption compared to re-bored or reconditioned liners.
Anti-Cavitation Protection – Factory-applied anti-cavitation coating prevents pitting on the coolant-side surface, which is a frequent failure mode in marine and generator engines running at constant speed and load.
Dimensional Precision – Machined to OEM tolerances: bore roundness within 0.02 mm, bore taper within 0.03 mm. This eliminates piston slap, reduces engine noise, and improves mechanical efficiency by 3–5%.
Drop-in Fitment – Exactly matches Mitsubishi genuine dimensions. No on-site machining required. Comes with correct O-ring groove count and depths (3 lower, 1 upper).
Compatible with High-Pressure Combustion – The alloy composition and centrifugal casting process provide tensile strength >350 MPa, suitable for engines running at peak cylinder pressures up to 200 bar (modern turbocharged aftercooled S12R/S16R).
Installation tip: Always replace piston rings, O-ring seals, and cylinder head gaskets when installing new cylinder liners. Use a liner protrusion gauge to ensure correct height (typically 0.07–0.12 mm above block deck).
4. Why Choose Rsolid Engine Parts for This Cylinder Liner?
Rsolid Engine Parts (www.rinjector.com) is a trusted global supplier of aftermarket diesel engine components. When you purchase the 37507-22701 Cylinder Liner from us, you benefit from:
OEM Interchangeability – Each liner is manufactured using original dimensions and material specifications. No adaptation required.
Rigorous Quality Control – Every liner undergoes:
Hardness test (3 points on flange, mid, lower)
Bore roundness & taper measurement (air gauge)
Liquid dye penetrant inspection for cracks
Anti-cavitation coating thickness check (30–50 µm)
100% hydrostatic pressure test (8 bar, 5 min)
Competitive Pricing – Direct supply from ISO-certified foundries allows us to offer 30–45% savings compared to genuine Mitsubishi parts, with equal or better metallurgy.
Global Inventory & Fast Shipping – Bulk packed in 6-liner (S6R full set), 12-liner, or 16-liner kits. Express air freight via DHL/FedEx (3–7 days) or cost-effective sea freight. Emergency single-liner orders accepted.
Technical Support – Not sure about compatibility? Our engine experts are available via WhatsApp: +8615975376778 for instant chat. We also provide installation manuals, torque specifications, and break-in procedures.
Warranty – 12‑month warranty against material defects, manufacturing errors, or premature wear under normal operating conditions.
Visit our website www.rinjector.com to explore our full range of Mitsubishi engine parts: cylinder liners, piston rings, bearings, gasket kits, turbochargers, and fuel injection components. For bulk orders or urgent inquiries, WhatsApp +8615975376778 now.
