You can replace it with a 1.8 as both are XU engines with the same engine
mounts. Unsure of gearboxes but if the 306 gearbox OK, it should mate up to
the 1.8 (i think). The only problems you may have is how the vacuum pump is
powered (as you say), and also how the power steering pump powered (and
located). 309 engines are 1.8s (like the 205 diesels).
Other cars with the XU diesels are BX (1.9), ZX (1.9), 405 (1.9), Rover 218
(1.8TD, 1.9 NA) and probably a few more that i cant think of at the moment.
They'll all have slight differences but would all fit in OK.
And the heads are interchangeable.
Have you snapped a cambelt or something?
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.