Original SANY Valve Train Group 160102130004A050 – Precision Timing for Heavy Duty Diesel Power

Valve Train Group

Группа газораспределительного механизма

Grupo del Tren de Válvulas

The 160102130004A050 Valve Train Group is the precision actuation system that orchestrates valve timing in SANY heavy‑duty diesel engines. For the D12 inline‑6 engine (12.12 L displacement), this group controls 24 valves (4 per cylinder) through a mechanically driven overhead camshaft design. The group converts the rotational motion of the camshaft into linear motion at the valves, enabling precise control of intake and exhaust events.

At the core of the assembly lies the camshaft, a one‑piece forged steel component with induction‑hardened lobes. The cam profile is specifically optimized for the D12’s combustion characteristics, providing a valve lift of 12.5 mm for intake valves and 12.8 mm for exhaust valves. The camshaft is supported by five bearing journals and axially located by a thrust plate (part 61000191), preventing end‑float that would alter valve timing. The timing gears at the front of the camshaft are machined to an angular tolerance of ±0.1°, ensuring exact synchronization with the crankshaft via the timing gear train.

The 160102130004A050 group includes fully assembled tappet components (bucket tappets) that ride directly on the camshaft lobes. These tappets are surface‑hardened to 55 HRC and polished to a surface finish of Ra 0.2 μm to minimize friction. Above the tappets sit the push rods ‑ hollow steel tubes with hardened ball ends ‑ which transmit motion to the rocker lever assembly.

The rocker levers pivot on a hardened steel shaft and feature roller tips that reduce friction at the valve stem contact point. This roller design reduces parasitic drag, contributing to lower fuel consumption compared to slider‑type rockers. The valve actuation component includes two intake valves and two exhaust valves per cylinder. Each valve is made from high‑temperature alloy steel (21‑4N for intake, 21‑2N for exhaust) with induction‑hardened tips to resist wear from rocker lever contact.

Valve seats are powdered metal inserts (Fe‑Cu‑Mo) induction‑brazed into the cylinder head, providing durability against repeated impacts at up to 2,300 RPM. The valves are held closed by dual valve springs ‑ an outer spring with a flat wire design and an inner spring with an ovoid cross‑section. This dual‑spring configuration prevents valve float at high engine speeds while providing fail‑safe operation if one spring breaks.

Valve lash is adjusted via the adjusting screw and locknut system on each rocker arm. The 160102130004A050 group specifies cold valve clearances of 0.25 ±0.03 mm for intake valves and 0.45 ±0.03 mm for exhaust valves. These clearances account for thermal expansion of the aluminum cylinder head (coefficient of thermal expansion 23 × 10⁻⁶ /°C) and steel valve train components (12 × 10⁻⁶ /°C). Proper lash adjustment is critical ‑ excessive clearance causes loud tapping noise and reduced valve lift, while insufficient clearance can prevent valves from seating fully, leading to burned valves and compression loss.

Why the 160102130004A050 Valve Train Group Delivers Superior Valve Control

Technical Specifications – Valve Train Group 160102130004A050

Installation of the 160102130004A050 valve train group requires careful attention to alignment and timing marks. Begin by setting the engine to top dead center (TDC) on cylinder 1. Install the camshaft with the timing gear aligned to the crankshaft gear mark, ensuring the cam keyway is oriented correctly. The valve train is timed by aligning scribe marks on the camshaft sprocket with the cylinder head casting mark. Torque the camshaft retaining bolts to 50 N·m using a star pattern.

After installing the camshaft, place the tappets into their bores (pre‑oiled with engine assembly lubricant). Insert the push rods, ensuring the ball ends seat correctly into the tappet sockets and rocker arm cups. Install the rocker lever shafts with the rocker arms positioned over each valve stem. Torque the rocker shaft bracket bolts to 45 N·m in a progressive sequence from the center outward. The valve bridges must be installed with their concave side facing up, engaging both valve stems simultaneously.

Valve lash adjustment must be performed on a cold engine (coolant temperature below 30°C). Rotate the engine through two full revolutions to seat the timing chain tensioner. Using feeler gauges, adjust each rocker to the specified clearance: intake 0.25 mm, exhaust 0.45 mm. Turn the adjusting screw while holding the locknut stationary, then tighten the locknut to 25 N·m without disturbing the screw setting. Recheck clearance after tightening. On engines with engine braking (EVB) systems, additional clearance adjustments may be required following the specific EVB procedure in the service manual.

After completing valve adjustment, rotate the engine manually through 720° and recheck all clearances. Any deviation indicates an incorrect adjustment or worn components. Start the engine and listen for any abnormal tapping or knocking which may suggest excessive backlash. If valve train noise is present during the first 30 seconds of cold start, recheck clearances after the engine has cooled completely.

Applications of Valve Train Group 160102130004A050

To verify authenticity, inspect the camshaft for the SANY logo and OEM number 160102130004A050 etched into the rear journal face. Each valve also carries a laser‑marked part number prefix. Genuine SANY valves have a distinctive gold‑colored stellite coating on the valve face, which resists high‑temperature erosion. Aftermarket valves often omit this coating and will show valve recession within 2,000 operating hours, leading to compression loss and increased fuel consumption. Always source from authorized SANY parts distributors.

When ordering the valve train group, specify your engine serial number (ESN) and confirm whether your engine is equipped with an engine brake. There are two variants of the 160102130004A050 – standard for naturally aspirated and turbo‑only configurations, and an EVB‑compatible version for engine brake applications. The EVB version includes modified rocker levers with the decompression slave pistons and additional sealing washers. The standard group includes standard rocker arms without the EVB plungers. The parts catalog will indicate which variant applies to your SANY equipment model.