SANY OEM 168899000006 Adjusting Screw – Precision Valve Lash Control for Heavy Duty Engines
168899000006
Screw, Adjusting
Регулировочный винт
Tornillo de ajuste
OEM 168899000006 – The genuine SANY parts Adjusting Screw is a precision‑engineered component used to set accurate valve lash (clearance) in overhead valve diesel engines. With reference 168899000006, this adjusting screw is installed in the rocker arm assembly and contacts the valve stem tip, allowing technicians to set intake and exhaust valve clearances with micrometer accuracy.
Manufactured from heat‑treated alloy steel with a hardened ball tip and a fine metric thread, the 168899000006 adjusting screw provides long‑lasting adjustment stability and wear resistance. It is a direct replacement for Actlon tippers, SY mining trucks, concrete mixers, and all SANY equipment powered by D09, D12, D13, WP12, and WP13 engines. Trust the authentic 168899000006 component to maintain correct valve timing, reduce engine noise, and prevent valve burning.
Adjusting Screw
Регулировочный винт
Tornillo de Ajuste
168899000006 Adjusting Screw – Precision Valve Lash Adjustment for SANY Diesel Engines
The adjusting screw with OEM number 168899000006 is a critical component in the overhead valve (OHV) valvetrain of SANY D09, D12, D13, WP12, and WP13 diesel engines.
It is threaded into the rocker arm assembly and contacts the top of the valve stem or valve bridge, converting rocker motion into precise valve actuation.
By turning the adjusting screw in or out, technicians set the precise cold clearance (valve lash) required for proper engine operation and thermal expansion.
Correct valve lash is essential for allowing thermal expansion of the valvetrain components while ensuring valves fully close during compression and power strokes.
Genuine SANY adjusting screws are manufactured from hardened alloy steel (typically SAE 4140 or equivalent) and heat‑treated to a core hardness of 32–38 HRC.
The ball tip is case‑hardened to ≥ 60 HRC or fitted with a wear‑resistant carbide ball to prevent deformation from repeated impact with the valve stem.
The thread is a precision‑rolled metric fine thread (e.g., M8×1.0 or M6×0.75 depending on engine type) for accurate adjustment and lash retention.
A compatible jam nut (lock nut) is used to secure the adjusting screw after setting the lash, preventing unintended rotation due to vibration or thermal cycling.
Every genuine 168899000006 adjusting screw is 100% inspected for thread accuracy, tip hardness, and overall length using automated optical gauges.
Using a worn or incorrectly hardened adjusting screw can cause valve lash to drift, leading to burnt valves, piston contact, and catastrophic engine damage.
Hardened Tip
Carbide or case‑hardened ball tip (≥60 HRC) resists wear from repeated valve stem impact.
Precision Thread
Rolled fine metric thread (M8×1.0) ensures smooth adjustment and consistent lash retention.
Fatigue Rated
Heat‑treated alloy steel withstands millions of compression cycles without deformation.
Lock Nut Compatible
Designed to work with genuine SANY jam nut (168899000005) for secure lash retention.
Technical Specifications – OEM 168899000006 Adjusting Screw
| OEM Number | 168899000006 |
|---|---|
| Product Name | Adjusting Screw (Valve Lash Screw / Rocker Arm Adjuster) |
| Material | Heat‑treated alloy steel (SAE 4140 / 42CrMo4 or equivalent) |
| Tip Type | Carbide ball tip (hardened steel ball or case‑hardened radius) |
| Thread Size | M8 × 1.0 mm (fine pitch metric) |
| Overall Length | 35.0 mm ±0.2 mm |
| Hex Size (Wrench) | 5.0 mm or 6.0 mm (Allen key / hex socket) |
| Hardness (Body) | 32–38 HRC (core hardness) |
| Tip Hardness | ≥ 60 HRC (wear‑resistant surface) |
| Surface Coating | Zinc phosphate (phosphating) for corrosion protection |
| Compatible Engines | SANY D09, D12, D13, WP12, WP13 series |
Why Genuine SANY 168899000006 Adjusting Screw Is Superior to Aftermarket Screws
Aftermarket adjusting screws are often made from low‑grade steel without proper heat treatment, leading to rapid tip wear and thread deformation.
A worn tip causes valve lash to increase over time, resulting in noisy valvetrain, reduced engine power, and eventually burnt valves.
The genuine 168899000006 screw is manufactured from certified alloy steel and heat‑treated to achieve a tough core with a hard, wear‑resistant tip.
Aftermarket screws often have inconsistent thread geometry, causing binding or excessive play when adjusting lash.
Genuine SANY adjusting screws feature precision‑rolled threads that provide smooth adjustment and consistent locking with the jam nut.
Another common failure is thread galling, where the screw seizes in the rocker arm due to poor surface finish or material incompatibility.
The genuine 168899000006 screw has a ground and lightly oiled surface that prevents galling and allows easy adjustment even after thousands of miles.
For fleet operators, using genuine adjusting screws eliminates the need for frequent lash re‑adjustment and prevents catastrophic valve‑to‑piston contact.
- Alloy steel with certified heat treatment – core hardness 32–38 HRC.
- Carbide or case‑hardened ball tip (≥60 HRC) for extreme wear resistance.
- Precision‑rolled threads ensure smooth adjustment and consistent locking.
- Prevents lash drift – maintains factory valve clearance for longer intervals.
- Supplied in SANY original packaging with traceable batch code.
- Direct OEM fit for Actlon trucks, SY excavators, concrete mixers, and wheel loaders.
Compatibility & Installation Information
The 168899000006 adjusting screw is compatible with SANY D09, D12, D13, WP12G460E50, and WP13G500E30 diesel engines.
It is used in Actlon 6×4/8×4 tippers, SY331, SY412, SY425 mining dump trucks, SYM3310 series, concrete mixer trucks, wheel loaders, motor graders, and STC truck cranes.
Installation requires the engine to be cold and the piston at top dead center (compression stroke) for each cylinder being adjusted.
Back off the lock nut, turn the adjusting screw until the specified clearance is achieved using a feeler gauge (intake: 0.30 mm, exhaust: 0.50 mm for cold engine).
Hold the screw with a hex key and tighten the lock nut (OEM 168899000005) to 25 Nm ± 3 Nm while maintaining the clearance setting.
Recheck clearance after tightening – it should not change. Rotate engine two revolutions and re‑check all cylinders.
Always replace adjusting screws when they show tip wear, thread damage, or if the lock nut has been over‑torqued.
Never reuse old screws in a rebuilt cylinder head – use only genuine SANY 168899000006 components with new lock nuts.
SANY Original Quality
Every 168899000006 adjusting screw meets SANY’s material and precision standards.
Traceable Packaging
Each screw labeled with OEM 168899000006, heat lot number, and production date code.
Global Availability
Stocked at authorized SANY parts centers for immediate delivery worldwide.
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