At a constant rev range the power (or thrust) can be increased, decreased or even reversed by changing the pitch of the blades. Think about how a turbo prop planes engine works. The way this works is – the pitch of the blades of the turbo are changed to create more boost at lower exhaust pressure. The GU patrol has a Garratt VNT (Variable Nozzle Turbo). The ECU on the early GU patrols doesn’t control the boost very well. The correct amount of oil for the Di ZD30 is 8.3 Litres. After a while they noticed many failures and “fixed” the problem by recalling the Patrols to shorten the dipstick. When the early engines came out, Nissan recommended that it only required 6 or so litres of oil. However the blank gunk deposited creates restrictions in the inlet manifold causing hot spots and starvation to mainly number 2 and 3 cylinders. This valve recycles inert (but very dirty) exhaust gas back into the inlet manifold in an effort to reduce emissions. (Short version) There are 5 root causes for the ZD30 engine failures. NADS or Nissan Anti Detonation System is a series of simple modifications that can be done to the ZD30 engine and exhaust to avoid the well documented issues with piston and engine damage. Any advice on this thread is just that – advice. This thread is not here to debate the reliability of the engine, or compare it to the 4.2 or petrol variants, its here as an easy to follow guide for anyone interested in doing the modifications. The Nissan Patrol 3 Litre ZD30 engine can have a few modifications to make it more reliable and avoid the dreaded ‘grenade’.
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