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– Pull unit injector out of cylinder head seat with gentle upward taps. 1.4.2 Installing Note ♦ Each time work is performed which requires adjustment of the unit injector, the adjustment screw in the rocker arm and also the unit injector ball stud must be renewed. ♦ New unit injectors are supplied with O-rings and heat shield seal. – Heat shield seal and O-rings must be renewed if old unit in‐ jector is reused. ⇒ page 172 – Check that the three O-rings and the heat shield seal along with securing clip are seated correctly before installing unit in‐ jector. Note The seals must not be twisted. – Oil the seals and fit the unit injector into the seat in cylinder head with great care. – Push the unit injector evenly into the cylinder head onto its limit stop. – Insert tensioning block in slot on side of unit injector. Note If the unit injector is not at right angles to the tensioning block the securing bolt may loosen and this can damage the unit injector or the cylinder head. – Therefore align the unit injector as follows. unit injector can still be turned easily. – Now align unit injector at right angles to camshaft bearing seat. 4-cylinder diesel engine (1.9 l engine) - Edition 01.2009 170 Rep. Gr.23 - Mixture preparation - injection
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