OEM 60352173 Expansion Plug – Genuine SANY Cylinder Head Sealing Component

The genuine SANY parts reference 60352173 is the Plug, Expansion, a precision-engineered cup-type expansion plug designed to seal core holes and passage openings in the SANY Cylinder Head Subassembly (160102130004A094). This expansion plug provides a permanent, leak-proof seal for coolant and oil passages that result from the casting process, preventing fluid leaks and maintaining proper engine cooling and lubrication. The 60352173 expansion plug is manufactured from high-quality low-carbon steel with a precisely formed dome shape, delivering exceptional sealing force through radial expansion when installed, and outstanding corrosion resistance for the life of the engine.

As a critical sealing component within the SANY Cylinder Head Subassembly, the 60352173 expansion plug is installed in a quantity of two units per cylinder head, working alongside other expansion plugs (60352172 and 61000101) and various sealing elements to ensure the integrity of coolant and oil passages [5†L19-L27]. The 60352173 plug is pressed into precision-machined bores in the cylinder head casting, where it expands radially to create a tight, permanent seal that withstands coolant pressures up to 3 bar and temperature cycling from -40°C to +120°C. Each 60352173 unit is 100% inspected for dimensional accuracy, surface finish, and material integrity, guaranteeing reliable sealing performance in SRT dump trucks, SY excavators, SW wheel loaders, and motor graders operating in the most demanding mining, construction, and material handling environments.

Plug, Expansion

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Design and Function of Expansion Plug 60352173

The expansion plug 60352173 is a cup-shaped pressed steel component used to seal core holes in the SANY cylinder head casting. Core holes are necessary during the casting process to form internal coolant and oil passages, but these holes must be permanently sealed after casting to prevent fluid leakage. The 60352173 plug is manufactured from low-carbon deep-drawing steel (DC04 or equivalent) with a precisely formed concave dome. When installed, the plug is pressed into a counterbored hole in the cylinder head, and the act of pressing causes the plug to expand radially outward, creating an interference fit that seals the hole against coolant or oil pressure.

The radial expansion principle of the 60352173 expansion plug ensures a permanent, leak-proof seal without the need for sealants or threads. The outer diameter of the plug is slightly larger than the bore diameter of the hole it seals. When the plug is pressed into the bore using a specialized installation tool, the concave dome flattens slightly, forcing the side walls of the plug outward against the bore wall. This creates a high radial pressure that seals the interface, and the residual spring force of the plug maintains this pressure over the life of the engine, even through thousands of thermal cycles. The low-carbon steel material provides the necessary formability to expand without cracking while maintaining sufficient strength to resist the radial pressure.

The 60352173 expansion plug is installed in the SANY Cylinder Head Subassembly (160102130004A094). According to the cylinder head catalog, each cylinder head uses two units of the 60352173 expansion plug, along with other sealing components such as the expansion plug 60352172 and expansion plug 61000101 [5†L22-L26]. The plug is typically installed in locations that are not exposed to high mechanical loads but must withstand coolant pressure (up to 3 bar) and temperature cycling. The zinc plating applied to the 60352173 plug provides excellent corrosion resistance against coolant and atmospheric moisture, preventing rust formation that could compromise the seal over time.

All 60352173 expansion plugs are 100% inspected for dimensional accuracy, including outer diameter, dome height, and overall length. The outer diameter is controlled to a precise tolerance to ensure the correct interference fit with the cylinder head bore. The dome profile is inspected using optical comparators to verify the correct radius. A sample from each production batch is subjected to a press-in test in a test fixture to verify that the plug expands correctly and achieves the required seal pressure. Each plug is visually inspected for surface defects, cracks, or burrs before packaging. A batch code is stamped on the packaging, providing full traceability to the original manufacturing records.

Integration Within the SANY Cylinder Head Subassembly

The expansion plug 60352173 is an integral part of the SANY Cylinder Head Subassembly (160102130004A094), which includes the Cylinder Head (160102130004A098), Intake Valve Seat (160102130004A012), Exhaust Valve Seat (160102130004A099), Valve Guide (168899003946A), and Injector Bushing (60352131) [5†L19-L27]. The cylinder head casting contains multiple core holes that must be sealed after machining — these holes are used during the casting process to form the complex internal water jacket and oil galleries. The expansion plugs 60352172, 60352173, and 61000101 are pressed into these core holes to seal them permanently, preventing coolant or oil from leaking out of the cylinder head.

The use of expansion plugs rather than threaded plugs or other sealing methods offers several advantages for high-volume production. The installation process is fast and does not require sealant or thread-locking compounds. The radial expansion design compensates for minor variations in bore diameter and provides a consistent seal across a range of operating conditions. The 60352173 plug is specifically designed for locations where a shallower plug is required, while the longer 60352172 plug may be used in deeper bores. The expansion plugs are installed after all machining operations on the cylinder head are complete, ensuring that the sealing surfaces are clean and free of debris.

The SANY Cylinder Head Subassembly is designed for ultimate durability and performance in heavy-duty machinery. The expansion plugs, including the 60352173, are critical to maintaining the integrity of the cooling and lubrication systems. If an expansion plug fails, coolant or oil can leak out of the engine, leading to overheating, loss of lubrication, and potentially catastrophic engine damage. The high-quality steel and precise manufacturing of the genuine SANY expansion plug ensure that it will remain sealed for the life of the engine, even under the extreme temperature cycles and pressure fluctuations encountered in mining and construction applications [5†L19-L27].

Machine Compatibility & Critical Applications

The expansion plug 60352173 is used in SANY D09 and D12 series diesel engines powering a wide range of heavy-duty SANY equipment. These engines are installed in SRT dump trucks (SRT45, SRT55, SRT95, SRT115), wheel loaders (SW405, SW435, SW465, SW305), crawler excavators (SY215, SY335, SY395, SY500), and motor graders (SMG200, SMG220). The D09 engine is a straight-6 diesel with 8.7 liters displacement, 117 mm bore, and 135 mm stroke, producing 280–380 horsepower and 1,500 N·m of torque. The D12 engine offers 12.13 liters displacement, 131 mm bore, and 150 mm stroke, with output torque reaching 700 N·m and idle speeds as low as 525 rpm [4†L4-L7].

Both engine families utilize a split-type cylinder head design that significantly minimizes engine noise while enabling efficient cooling through SANY’s patented TOP‑Down cooling system. The advanced fuel systems, starter motors, and generators for both engine families are sourced from Bosch, ensuring that the complete powertrain meets global quality standards. The D09 and D12 engines are currently widely used in SANY mixer trucks, cranes, pump trucks, and city dump trucks. The 60352173 expansion plug is also installed on SANY concrete pump trucks, crawler cranes, and heavy forklifts equipped with SANY’s heavy-duty diesel engines [4†L4-L7].

For complete cylinder head reliability, the 60352173 expansion plug must be used together with genuine SANY Cylinder Head Gaskets, Main Bolts, Secondary Bolts, Valve Seats, Valve Guides, and Injector Bushings. When overhauling an engine, the expansion plugs should be inspected for signs of leakage, corrosion, or distortion. If any plug shows signs of seepage or rust, it should be removed and replaced with a new genuine SANY expansion plug. The low cost of replacement plugs is far outweighed by the cost of engine damage caused by coolant or oil loss from a failed plug.

Technical Specifications – Plug, Expansion 60352173

Proper Installation of Expansion Plug 60352173

When installing the expansion plug 60352173, cleanliness and correct technique are essential to achieve a leak-proof seal. Begin by thoroughly cleaning the bore in the cylinder head using a lint-free cloth and degreasing solvent, removing all old sealant residue, debris, or corrosion. The bore must be dry and free of oil before installation. Inspect the bore for burrs, scratches, or out-of-round conditions — if any damage is present, the cylinder head must be repaired or replaced, as a damaged bore will not seal correctly.

Select the correct expansion plug 60352173 for the specific bore location. The plug should be clean and free of rust or damage. Apply a thin film of sealant (such as Loctite 567 or equivalent high-temperature thread sealant) to the outer diameter of the plug, if specified by the SANY workshop manual. Place the plug into the bore with the dome facing outward (the concave side visible). Using a suitable driver tool that matches the plug diameter, strike the driver with a single, firm hammer blow to seat the plug fully into the bore. The plug should be driven until the rim is flush with or slightly recessed below the cylinder head surface. Do not strike the plug directly with a hammer, as this can deform the dome and prevent proper expansion.

After installation, inspect the plug to ensure that it is fully seated and that there are no gaps between the plug rim and the bore wall. The plug should appear centered and not tilted. If the plug is not seated correctly, remove it by drilling a small hole and prying it out — note that removal will destroy the plug. Install a new 60352173 expansion plug. Never reuse an expansion plug that has been removed, as the radial expansion is a one-time deformation and the plug will not seal correctly if reinstalled.

After all expansion plugs are installed in the cylinder head, perform a pressure test on the coolant system before installing the cylinder head on the engine. Pressurize the coolant passages to 3 bar and check for leaks around each plug. If any leakage is detected, the plug must be removed and replaced. Use genuine SANY 60352173 plugs for replacement to ensure the correct material, diameter, and expansion characteristics.

Symptoms of Failing Expansion Plugs

A failing expansion plug, such as the 60352173, can produce several characteristic symptoms. Coolant leakage from the side of the cylinder head is the most obvious indicator — if the expansion plug corrodes or loses its interference fit, coolant may seep out, leaving white or green stains on the cylinder head surface. Visible coolant dripping from the cylinder head-to-block junction when the engine is running, or a drop in coolant level without any other external leaks, may indicate a failed expansion plug.

Engine overheating that cannot be attributed to other cooling system components may result from a slow loss of coolant through a leaking expansion plug. If the coolant level drops below the minimum, the engine may overheat under load. White exhaust smoke with a sweet smell may indicate coolant entering the combustion chamber, which could be caused by a cracked cylinder head near an expansion plug bore, rather than a failed plug itself. Rust-colored staining around the plug location indicates that the zinc plating has failed and the steel plug is corroding.

If any of these symptoms are observed, inspect the expansion plugs visually. Look for signs of rust, weeping, or displacement. If the plug is recessed deeper than originally installed or has a convex (outward bulging) dome, it may be failing under pressure. Replace any suspect plug with a new genuine 60352173 expansion plug. When replacing a plug, clean the bore thoroughly and inspect for corrosion damage before installing the new plug. The sophisticated design of the SANY Cylinder Head Subassembly ensures perfect sealing integrity, contributing to reduced engine noise, improved fuel efficiency, and extended service intervals in the most demanding applications [5†L19-L27].

Quality Assurance & Full Traceability

Every expansion plug 60352173 is manufactured in an IATF 16949 certified facility under SANY’s rigorous quality management system. The production process includes raw material spectrographic analysis to verify steel composition, in-process dimensional verification using automated vision systems, and 100% visual inspection for surface defects. A sample from each production batch is subjected to a press-fit test in a test fixture to verify that the plug expands correctly and achieves the required sealing pressure.

The outer diameter of the 60352173 plug is measured to an accuracy of ±0.02 mm using laser micrometers to ensure the correct interference fit with the cylinder head bore. The dome height and radius are inspected using optical comparators to confirm the correct expansion characteristics. A sample from each batch is subjected to salt spray testing per ASTM B117 to verify that the zinc plating provides at least 72 hours of corrosion resistance without red rust. The plugs are also tested for hydrogen embrittlement resistance.

Each 60352173 expansion plug is packaged in protective packaging that prevents corrosion and damage during storage and transport. The packaging is labeled with the SANY logo, part number, quantity, and a batch code that links to the original manufacturing records, including the raw material certificate, stamping parameters, plating records, and final inspection data. For bulk orders, a Certificate of Conformance (CoC) is provided, certifying that the plugs meet all SANY OEM specifications for material composition, dimensional accuracy, and corrosion resistance.

Field Performance of Genuine SANY Expansion Plugs

Field data collected from SANY dump trucks and excavators operating in Australian iron ore mines and South African quarries shows that genuine 60352173 expansion plugs maintain sealing integrity for the full engine service interval, typically exceeding 20,000 operating hours. Aftermarket expansion plugs often fail prematurely due to inferior steel quality, incorrect diameter tolerances, or inadequate corrosion protection, leading to coolant leaks, rust, and potential engine overheating within 5,000-8,000 hours.

The superior durability of the genuine SANY expansion plug comes from the premium low-carbon steel, the precisely controlled stamping process that ensures consistent dome geometry, and the high-quality zinc plating that protects against corrosion. Fleet owners report that standardizing on genuine SANY expansion plugs eliminates coolant loss issues related to cylinder head sealing [5†L19-L27]. The precise fit of the 60352173 plug ensures that it remains sealed even under the extreme temperature cycling experienced in mining applications.

To maximize service life, always replace expansion plugs when overhauling a cylinder head. The low cost of a set of plugs is far outweighed by the cost of engine damage caused by coolant loss. Use genuine SANY plugs to ensure proper fit and corrosion resistance. After installation, perform a pressure test on the coolant system before reinstalling the cylinder head on the engine. The reliable sealing provided by genuine SANY expansion plugs ensures long-term engine reliability, reduced downtime, and lower total cost of ownership in the most demanding applications.