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The older Mazda B2000 trucks has adjustable valve lash adjusters; they need to be readjusted periodically about once a year depending up on how much you drive. The Mazda Truck I have is 1990 B2200 4 cylinder 2.2 liter, has carburetor. The truck has hydraulic Lifters can not be adjusted manually. But they adjust automatically. Each lifter has small hole on the side, fills up with oil and adjusts the valve lash. The bottom of each lifter has small steel valve they look like steel ball sitting on gasket. The gaskets look like a rounded flat washer. Some times they leak oil out and do not stay full of oil; when this condition happens the lifters collapse and leaves big valve lash (clearance between the valves and lifters). The engine becomes very noisy you hear loud taping sound at higher RPM. If you have not started your Truck for a while, when you start the engine for first few minutes you hear taping valves that is normal. When the engine reaches operating temperature you should hear only ticking sound not loud tapping. If the small holes are clogged up due to oil slugs and dirt in the engine, flush The engine with Motor Flush available from auto parts stores. Then change filter and oil with right viscosity to your climate per owners manual. If you use heavy oil additive to reduce consumption (oil burn) on older engines you need to consider that this holes in valve lifters are very small. Thay are smaller than the tip of ball pen. These lifters are also very small in size. Al Fred

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