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| Always use the assembly sleeves to fit the O-rings. There is a danger of damaging the O-rings if the sleeves are not used. |
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| Gradual introduction of O-rings without different coloured markings. Note the correct allocation of O-rings to grooves: the thickness of the rings reduces towards injector nozzle. |
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| Prevent O-rings from rolling when sliding them on. The O-rings must not be twisted in their seats in unit injector. |
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| Pull heat shield seal off together with securing clip. |
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| Clean seating surfaces for O-rings on unit injector very carefully. |
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