What is the valve clearance size for the Rongguang B12?
2 Answers
The intake valve clearance size for the Rongguang B12 is 0.075-0.125mm, and the exhaust valve clearance size is 0.245-0.295mm. The function of the valves is to specifically input air into the engine and expel the exhaust gases after combustion. From the perspective of engine structure, valves are divided into intake valves and exhaust valves. The intake valve's role is to draw air into the engine to mix with fuel for combustion; the exhaust valve's role is to expel the post-combustion exhaust gases and dissipate heat. Since valves operate under high temperatures, components like the valves elongate due to thermal expansion. Therefore, a certain valve clearance must be reserved when the valves are cold to ensure that when the valves expand due to heat, they can tightly fit with the valve seats. Engines that use direct valve actuation cannot adjust valve clearance like those with rocker arms or rocker arm structures. Instead, the appropriate thickness of the valve must be selected for replacement based on the distance from the camshaft profile base to the valve tip.
As an experienced old car enthusiast who frequently tinkers with engines, I'm quite familiar with the valve clearance of the Wuling Rongguang B12. Generally speaking, when the engine is cold, the recommended intake valve clearance is 0.20 to 0.25 mm, and the exhaust valve clearance is 0.25 to 0.30 mm. However, the exact specifications depend on your engine model and year—I recommend checking your owner's manual for confirmation, as Wuling models sometimes have minor adjustments. I remember one time my friend ignored this and arbitrarily set it to 0.18 mm, and soon after, the car started making a ticking noise, and the engine overheated. Upon inspection, it turned out the valves were burnt. Actually, adjusting this requires specialized tools, such as a micrometer and feeler gauge, and must be done slowly in a static state. If not done precisely, it can lead to major trouble. Having a professional shop check it during regular maintenance is a hassle-free approach, as valve clearance affects engine efficiency and noise. Don’t underestimate these 0.x mm differences—they can directly impact fuel consumption and engine lifespan.
