History
Minor changes were made to the unit during its production, including an uprated oil pump around mid 1997, with the addition of larger oilways in the head machining (T-Vents), and modified valve lifters to reduce top-end valve noise, at which point the cam belt arrangement also changed with the lower idler moving.
Around 1998, the spin-on metal canister oil filter was changed to a disposable paper element.
2000 saw a complete revision of the power plant in order to meet increasing emission requirements, with the 2.5 and 3.0 being replaced by lower compression 2.6 (Y26SE) and 3.2 (Y32SE) units.
These later power plants had a revised engine management system setup, which utilised quad lambda sensor control, coil per plug ignition system and drive by wire throttles. The 3.2 also received a stronger steel crankshaft. As a result of these changes the EGR and secondary air injection system were removed.
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