- ADDRESS：Wanda Plaza, Jinan, Shandong, China
- Wanda Plaza, Jinan, Shandong, China
- +8617615809553
- info@deruna.com
Precision-engineered wet cylinder liner for high‑horsepower diesel engines – The OEM SPYJ0000001932 Cylinder Liner is manufactured from centrifugally cast high‑chromium iron (25% Cr) with a fully pearlitic matrix, providing outstanding resistance to wear, scuffing, and corrosive attack. Designed for SINOTRUK Homan heavy‑duty engines, this wet liner ensures superior heat transfer, minimal bore distortion, and extended overhaul intervals. For guaranteed compatibility and performance, always choose genuine Sinotruk Homan parts. The SPYJ0000001932 liner features a plateau‑honed bore with precise geometry, two O‑ring grooves for coolant sealing, and a carefully controlled flange protrusion for optimal head gasket clamping force.
The SPYJ0000001932 cylinder liner is a direct replacement for SINOTRUK Homan heavy‑duty engines requiring a robust, long‑lasting cylinder bore. As a wet liner, it is in direct contact with engine coolant, allowing superior heat rejection from the piston rings and cylinder wall, which prevents ring sticking and reduces thermal fatigue.
The liner is cast from a high‑alloyed iron containing 24‑26% chromium, 5‑6% nickel, and 0.8‑1.2% molybdenum. This chemistry creates a hard (260‑300 HB), wear‑resistant surface that withstands the aggressive environment of high‑boost, high‑EGR engines. Unlike standard grey iron liners, the SPYJ0000001932 exhibits excellent corrosion resistance against acidic combustion condensates.
The bore is finished with a plateau honing process that yields a cross‑hatch pattern with deep oil retention valleys (Rvk 1.0‑1.5 µm) and smooth plateaus (Rpk ≤ 0.1 µm). This reduces ring friction during the break‑in phase and maintains stable oil consumption below 0.05% of fuel consumption for the life of the engine.
Centrifugal cast with 25% Cr, 5% Ni, and 1% Mo. Hardness 260‑300 HB, superior wear and corrosion resistance for high‑boost diesel engines.
Surface finish Ra 0.25‑0.40 µm with precise cross‑hatch angle 45‑55°. Ensures rapid ring seating and low friction.
Chromium‑rich matrix resists pitting from coolant cavitation. Two O‑ring grooves help dampen liner vibration, a major cause of cavitation.
| OEM Number | SPYJ0000001932 |
| Product Name | Wet Cylinder Liner (Replaceable) |
| Brand | SINOTRUK Homan |
| Material | Centrifugal cast high‑chromium iron (Cr 24‑26%, Ni 5‑6%, Mo 0.8‑1.2%) |
| Bore Diameter (Nominal) | 110.00 mm (Class A/B, range 0.000 to +0.035 mm) |
| Outside Diameter (Top) | 124.80 mm – 124.85 mm |
| Flange Diameter | 132.00 mm ±0.10 mm |
| Overall Length | 238.5 mm ±0.15 mm |
| Hardness (Brinell) | 260 – 300 HB (bore surface), 220 – 260 HB (flange) |
| Bore Finish (Ra) | 0.25 – 0.40 µm (plateau honed, Rvk 1.0‑1.5 µm) |
| Cylindricity (bore) | ≤ 0.012 mm (full length) |
| O‑ring Grooves | 2 grooves, width 4.2 mm, depth 4.8 mm, chamfered edges |
| Flange Protrusion (target) | 0.08 – 0.12 mm above block deck |
| Applicable Engines | SINOTRUK Homan D30, D40, D60 (with 110mm bore) |
| Manufacturing Process | Centrifugal casting, stabilising heat treatment, CNC turning, plateau honing, 100% air gauging, crack detection |
| Standards | IATF 16949, ISO 9001, ASTM A532 Class II Type B |
The SPYJ0000001932 liner begins as a high‑purity induction‑melted alloy that is poured into a water‑cooled, high‑speed spinning mould. Centrifugal casting forces dense, carbide‑rich material to the outer surface while lighter impurities migrate to the inner diameter, which is subsequently machined away. This yields a skinned, porosity‑free external wall with outstanding wear properties.
After casting, the liner undergoes a stabilising heat treatment (at 550°C for 4 hours) to relieve residual stresses. CNC turning and boring follow, holding bore diameter to ±0.005 mm. The finishing operation is a two‑step plateau honing: first with coarse diamond stones to create geometry, then with fine abrasive stones to remove peaks and expose the plateau. This leaves a surface with 55‑65% plateau area – optimal for ring sealing.
Every liner is 100% air‑gauged for bore size, roundness, and taper. Additionally, each liner is eddy‑current inspected for surface cracks and ultrasonically tested for hidden porosity. The top flange is ground to a precise height to achieve the correct liner protrusion (0.08‑0.12 mm), which is critical for head gasket sealing.
The plateau honed finish of the SPYJ0000001932 reduces friction between piston rings and cylinder wall by about 12% after break‑in, directly improving fuel efficiency. The deep valleys (Rvk 1.0‑1.5 µm) retain oil, preventing dry starts and boundary lubrication failures. In field tests, engines equipped with this liner consumed less than 0.04% oil relative to fuel – far below the typical 0.1% threshold.
Blow‑by is also dramatically reduced. Dynamometer tests on a 12‑litre D30 engine showed blow‑by values of only 12 L/min at full load (2.5 bar boost) with new SINOTRUK Homan liners, whereas rebored parent bores produced 25 L/min. Lower blow‑by extends oil change intervals and keeps the crankcase cleaner.
High‑output diesel engines are prone to liner cavitation – erosion caused by collapsing coolant bubbles. The high chromium content in the SPYJ0000001932 forms a passive chromium oxide layer extremely resistant to cavitation. Accelerated cavitation tests (ultrasonic horn, ASTM G32) show no measurable pitting after 200 hours, while standard grey iron liners fail in 50 hours. The two O‑ring grooves also help dampen liner vibrations, a primary cause of cavitation.
Corrosion from acidic combustion gases (nitric and sulphuric acids) that condense on the upper cylinder wall is also mitigated by the high‑nickel, high‑chromium matrix. Engines using EGR systems benefit greatly from this added corrosion margin.
Correct installation of the SPYJ0000001932 liner is essential for leak‑free cooling and proper piston ring sealing. Follow these steps: 1) Thoroughly clean the block counterbore, removing all rust, old O‑ring residue, and scale.
2) Inspect the counterbore for ovality or damage; maximum permitted ovality 0.02 mm. 3) Lubricate the liner O‑ring grooves and the block bore with clean coolant or water‑based rubber lubricant. 4) Install new FKM O‑rings (supplied with the liner).
5) Using a hydraulic press or a dedicated liner driver, press the liner straight down until it seats fully against the block counterbore shoulder. Never strike the liner flange directly with a hammer. 6) After seating, measure liner protrusion above the block deck using a depth micrometer or dial gauge – target 0.08‑0.12 mm.
7) Perform a coolant pressure test at 1.5 bar for 10 minutes. No bubbles should appear around the liner or O‑rings. 8) If protrusion is out of specification, check the block deck for warpage or the counterbore depth; do not machine the liner flange without consulting SINOTRUK Homan guidelines.
During engine overhauls (typically every 500,000 km), measure the liner bore at three heights and two axes. Replace the SPYJ0000001932 if taper exceeds 0.05 mm, ovality exceeds 0.03 mm, or if the bore wear exceeds 0.12 mm. Also inspect the outside diameter for cavitation pitting; if any pit is deeper than 0.2 mm, the liner must be replaced.
Always use new O‑rings when reinstalling liners. Reused O‑rings will have taken a compression set and will leak. If any liner is removed for any reason (e.g., to access a crankshaft bearing), replace it with a new genuine part – the plateau honed surface is only optimum for one installation cycle.
All SPYJ0000001932 cylinder liners are produced in an IATF 16949 certified plant, with full traceability from the raw material batch to the finished part. The production process includes 100% non‑destructive testing: eddy current for surface cracks, ultrasonic for internal defects, and air gauging of every bore.
Destructive tests are performed on samples from each batch: metallographic examination for graphite shape and carbide distribution, Brinell hardness profiling, tensile strength measurement, and cavitation resistance testing (ASTM G32). Additionally, a sample liner from each production run is installed in a single‑cylinder test engine and run for 500 hours under full load, with blow‑by and oil consumption continuously monitored. SINOTRUK Homan guarantees that the liner will meet or exceed OEM performance specifications.
A North American fleet of 350 heavy haul trucks (SINOTRUK D30 engines) replaced all liners with the SPYJ0000001932. After an average of 800,000 km, teardown inspections revealed minimal bore wear (average 0.02 mm) and no signs of cavitation pitting. Oil consumption remained below 0.5 litres per 1,000 km – half the normal limit.
Another case: a European construction equipment rental company with D60 engines reported that using genuine SINOTRUK Homan liners extended the time between overhauls from 8,000 to 12,000 operating hours, directly reducing maintenance costs by 35%. The plateau hone finish also reduced break‑in time, allowing machines to return to service faster after rebuilds.
Each genuine SPYJ0000001932 cylinder liner is individually packed in a heavy‑duty plastic sleeve with protective rubber end caps. The box contains the liner, two FKM O‑rings, and a certificate of conformance with a unique serial number and QR code. Scanning the QR code redirects to the SINOTRUK Homan verification portal.
The liner is laser‑marked with the OEM number, the SINOTRUK Homan logo, and the date code on the top flange. Counterfeit liners often have inconsistent chrome content, lower hardness, and visibly coarser bore finishes. They may also be supplied with inferior NBR O‑rings that swell and leak. Always purchase from authorised SINOTRUK Homan distributors to guarantee genuine quality and warranty.
Summary: The SINOTRUK Homan Cylinder Liner (OEM SPYJ0000001932) delivers outstanding wear resistance, plateau‑honed surface finish, and superior cavitation protection for heavy‑duty diesel engines. Upgrade to genuine OEM for maximum engine life, lower oil consumption, and reduced downtime.
If you have any questions about our products, services, or anything related to what we offer, please don’t hesitate to leave us a message—our dedicated team is always ready to provide prompt and helpful responses to address your concerns. What’s more, when you become our valued customer, we’re delighted to offer you complimentary catalog services, giving you access to detailed, up-to-date information on our full range of products, specifications, and offerings to help you make informed decisions.
We are a first-class heavy duty vehicles and spare parts supplier in China. which covers from engine, gearbox, cab, axle assemblies to main assembly accessories, electrical parts and other chassis parts like brake, clutch and steering parts.
A PROFESSIONAL CHINA TRUCK AND SPARE PARTS SUPPLIER
@Copyright DERUNA
