Product Analysis: Cylinder Liner 34A07-42100 D135 for Mitsubishi S6B3‑MPTK Diesel Engine

1. Basic Specifications & Parameters

The Cylinder Liner 34A07-42100 D135 is a precision-engineered wet-type cylinder sleeve designed specifically for the Mitsubishi S6B3‑MPTK diesel engine. The “D135” designation indicates a nominal bore diameter of 135 mm, a common size in Mitsubishi’s S6B engine family. This liner is manufactured to withstand the higher cylinder pressures generated by turbocharged and aftercooled configurations.

Key technical parameters:

• Part Number: 34A07-42100 (also referenced as D135 liner)

• Liner Type: Wet liner (coolant circulates around the outer wall)

• Material: High-grade centrifugally cast alloy iron (chromium‑molybdenum alloyed)

• Hardness: HB 210 – 250 (optimized for excellent wear resistance and machinability)

• Surface Finish: Plateau honed with precision cross‑hatch, Ra 0.25 – 0.50 μm

• Nominal Bore Diameter: 135.00 mm (OEM spec for S6B3‑MPTK)

• Flange Diameter (top): 155.0 mm

• Overall Length: 320 mm (suits the S6B3 block height)

• Lower Outer Diameter (below O‑ring grooves): 143.0 mm

• Number of O‑ring grooves: 2 lower (coolant sealing) + 1 upper (fire ring / gasket sealing)

• Coolant side protection: Anti‑cavitation and anti‑corrosion coating (tin‑based or phosphate)

• Weight per liner: Approximately 13.8 kg (30.4 lbs)

Each liner undergoes 100% inspection including bore roundness (≤0.025 mm), taper (≤0.03 mm), hardness profile, and a hydrostatic pressure test at 7 bar (101 psi) to validate coolant‑side integrity.

2. Compatible Engines & Applications

The 34A07-42100 D135 cylinder liner is a direct replacement for the following Mitsubishi engine:

• Mitsubishi S6B3‑MPTK – This is a 6‑cylinder, in‑line, turbocharged and aftercooled diesel engine. “MPTK” stands for Marine Propulsion, Turbocharged, K (likely aftercooled variant). It is commonly used in marine propulsion for small to medium vessels, auxiliary generator sets, and industrial drives.

In addition, the 34A07-42100 liner is compatible with several other models within the S6B series (always verify original part number):

• Mitsubishi S6B2 (some variants)

• Mitsubishi S6B3 (naturally aspirated and turbocharged)

• Mitsubishi S6B4 (early production models)

Typical applications include:

• Marine propulsion engines for fishing boats, tugboats, and coastal freighters

• Marine auxiliary generator sets (onboard power)

• Agricultural pumps and irrigation systems

• Construction machinery (compactors, small excavators)

• Stationary industrial engines for pumps and compressors

Important confirmation: Always cross‑check the original cylinder liner part number stamped on your old liner. The S6B3‑MPTK engine shares the same block architecture as other S6B models, but liner protrusion and O‑ring sizes may vary. We recommend verifying with the engine serial number before ordering.

3. Performance Advantages & Functional Improvements

Upgrading to a high‑quality aftermarket 34A07-42100 D135 cylinder liner from Rsolid Engine Parts delivers measurable benefits over worn or low‑grade alternatives:

• Extended Operational Life – The chromium‑molybdenum alloy iron provides superior resistance to ring groove wear and cylinder scoring. Typical service life reaches 10,000+ hours in marine propulsion duty, which is 20‑25% longer than standard grey iron liners.

• Optimized Heat Transfer – As a wet liner, coolant directly contacts the outer wall. Our liners feature a smooth, scale‑free outer surface that promotes efficient nucleate boiling, reducing cylinder wall temperature by 12–18 °C. Cooler operation minimizes piston ring sticking, oil carbonization, and thermal fatigue of the cylinder head gasket.

• Reduced Oil Consumption & Blow‑By – The plateau honed finish (Ra ≤0.50 μm) with a cross‑hatch angle of 30–40° ensures rapid ring seating and an excellent oil film. Field reports show 15‑20% lower oil consumption compared to re‑bored original liners or low‑precision aftermarket sleeves.

• Anti‑Cavitation Protection – The factory‑applied anti‑cavitation coating prevents pitting on the coolant side – a common failure in marine engines that run continuously at constant speed and load. This extends cooling system component life and prevents coolant leakage into the crankcase.

• Precision Fitment – Machined to OEM tolerances: bore roundness within 0.02 mm, bore taper within 0.025 mm. This eliminates piston slap, reduces engine noise, and improves volumetric efficiency by ensuring proper ring sealing.

• Drop‑in Installation – Exactly matches Mitsubishi genuine dimensions. No additional machining required. Includes the correct number and placement of O‑ring grooves (2 lower, 1 upper).

• Compatible with High‑Boost Applications – The alloy composition provides tensile strength ≥320 MPa, suitable for the S6B3‑MPTK’s boosted cylinder pressures (up to 160 bar).

Installation recommendation: Always replace piston rings, lower O‑rings, cylinder head gasket, and liner shims (if used) when fitting new liners. Measure liner protrusion above the block deck (spec: 0.05–0.10 mm) – adjust with shims.

4. Why Choose Rsolid Engine Parts for This Cylinder Liner?

Rsolid Engine Parts (www.rinjector.com) is a leading supplier of aftermarket diesel engine components. When you choose the 34A07-42100 D135 Cylinder Liner from us, you receive:

• OEM‑Grade Quality – Manufactured by ISO 9001:2015 certified foundries using original Mitsubishi dimensions and material specifications. No guessing – direct interchange.

• Stringent Quality Control – Every liner undergoes:

• Hardness testing (3 positions: top, middle, bottom)

• Air gauge measurement for bore roundness & taper

• Liquid penetrant inspection for micro‑cracks

• Anti‑cavitation coating thickness check (25–40 µm)

• Hydrostatic pressure test (7 bar, 5 minutes)

• Cost Savings – Direct factory relationships allow us to offer 30‑40% savings compared to genuine Mitsubishi parts, with equal or superior metallurgy.

• Fast & Reliable Shipping – Stock available for single liners or complete sets (6 liners for a full engine). Express shipping via DHL, FedEx, or UPS (3–7 business days worldwide). Sea freight for bulk orders.

• Expert Technical Support – Unsure about compatibility? Contact our engine specialists instantly via WhatsApp: +8615975376778. We provide installation guides, torque specs, and troubleshooting advice.

• Warranty – 12‑month unlimited‑hour warranty against material defects and manufacturing faults.

Visit www.rinjector.com to explore our complete range: cylinder liners, piston rings, bearing sets, full gasket kits, turbochargers, and fuel injection parts for Mitsubishi S6A, S6B, S6R, S12R, and S16R engines. For urgent inquiries or bulk pricing, WhatsApp +8615975376778 now.