I'm presently in the middle of replacing my intake manifold gasket, I have the manifold back together, however I still have the injectors to put back in.
I have noticed that on the injector ends that point into the manifold/engine, there is a round plastic 'cap' which appears to clip on to the injector end. I don't really know what these are for, as they leave a large hole on the injector end, however I've noticed that this cap on cylinder 6 injector has cracked.
Are these necessary to retain on the car? Are they supplied as a replacement with the lower O seal? I should renew all the O seals while they are out. I just don't know whether to worry about this plastic part or not.
Thanks
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