Once again i need your expert help.

there seems to be a lot of confusion about this topic.

I have a 1995 D21 Nissan Terrano with the 2.7 TD engine
Now, is Nissans TD27 engine gear driven motor with pushrods?
Are all TD27 engines the same? ( some have have silver and some have black rocker covers..)
Thanks for your help in advanced!
