Genuine Nissan 300ZX Turbocharger

Nissan 300ZX Turbocharger Parts Questions & Answers

• Turbo CHARGR
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  Q: How to remove and install a turbo equipped with coolant lines?

  A: If the turbo is equipped with coolant lines it will be necessary to drain the cooling system. Then, lift the vehicle and support it securely on jackstands. The front exhaust tube from the turbo should be removed, followed by the steering column lower joint. Next, remove the retaining bolts from the heat shields and remove the shields. The exhaust gas sensor electrical connector should be disconnected, as well as the oil delivery tube at the turbo. The oil drain pipe can be disconnected by loosening the rubber hose clamps and pulling the hose from the nipple. The inlet and outlet coolant delivery tubes from the turbo should also be disconnected. The four turbo retaining bolts securing the turbo to the exhaust manifold should be disconnected next. The turbo can then be removed out the bottom of the engine compartment. All traces of gasket and sealant material from the gasket mounting surfaces should be cleaned. Installation is the reverse of the removal procedure. Note: Install a new gasket and replace the metal washers on the hollow bolts connecting the coolant and oil delivery lines.
• CHARGR-Turbo
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  Q: What are the important considerations for maintaining and working with a turbocharger?

  A: The turbocharger, driven by exhaust gases, operates at extremely high temperatures and its castings retain heat for a long time, requiring at least three hours to cool down after the engine was last run. It is advisable to wear heavy gloves to prevent burns. The turbocharger's high rotation speed means that bearing life and operation is dependent upon a constant flow of engine oil, necessitating careful attention to the condition of the oil lines and the tightness of their fittings. Overtightening the hollow bolts can deform the unions and cause leakage. The turbocharger is dependent upon clean oil, so the engine oil should be drained and the oil filter changed any time the turbocharger is removed. If a bearing fails in the turbocharger or in the engine, all engine and turbocharger oil passages should be completely flushed before reassembly. As a ducted fan, the turbocharger's greatest enemy is dirt and foreign objects. A stray nut, metal chip or rock passing through a turbine rotating at 120,000 rpm can cause extreme damage. The best defense against foreign object damage is to clean the engine and turbocharger unit before working on it, cover all inlets and pipes, and account for every nut, bolt, screw and washer before starting the engine after assembly is complete.
• Turbo Charger
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  Q: How to diagnose and replace a defective turbocharger in a Nissan 300ZX?

  A: If any of the internal components, such as the waste gate, bearing(s) or oil seals are defective it will be necessary to replace the turbocharger as an assembly. New and factory rebuilt turbochargers are available from your Nissan dealer or local parts store. If the engine is lacking power, check for air leaks around the compressor, inlet/outlet tubes or the intake manifold and correct any faulty connection. If the engine shows excessively high engine power check for a disconnected or cracked rubber hose on the bypass valve. Replace the hose if a defect is found. If the engine exhibits excessively high oil consumption or the exhaust shows pale blue smoke, check for oil leaks at the lubricating oil passage connection. Further checks will require removal of the turbocharger. Remove the turbocharger. With the turbocharger on the work bench, inspect the turbine and compressor wheel by visually checking for cracks, clogging, deformity or other damage. Spin the wheels and check for free movement and abnormal noise or friction. Check axial play using a dial indicator positioned through the inlet opening on the compressor shaft. Using hand pressure only, move the compressor fan as far away 4 from the dial indicator as possible and zero the indicator. Push the compressor wheel toward the dial indicator and compare clearance to the Specifications. If the reading shows too much free play the turbocharger will have to be replaced.
• Charger Assembly-Turbo
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  Q: What is the purpose of the turbocharger and how does it work?

  A: The turbocharger, on the left exhaust manifold, compresses intake air from the air cleaner using two turbines. One turbine is turned by exhaust gases, which then turns the second turbine that compresses the intake air. An exhaust gas bypass valve prevents excessive supercharging pressure, opening at a set pressure to let exhaust gases bypass the turbocharger. An emergency relief valve is also included in the intake collector to relieve pressure. The turbocharger's emergency relief valve is attached to the intake collector. In 1985, water jackets were added to the turbocharger due to turbine bearing failures from extreme heat.