Final assembly on our 2002 Subaru Impreza Turbo engine

by Hagerty
9 November 2022

We’re just as eager as you are to hear this shiny new Subaru EJ20 flat-four fire up, but that will have to wait a bit longer.

There is something very satisfying seeing the unit finally come together though. It is now, unequivocally, an engine, rather than a collection of engine components, and the end result will be well worth sticking around for.

This time around we’re watching the final stages of assembly, with the cam covers going on either end of the engine, and the inlet manifold and associated components bolted to the heads – sitting spider-like over the block.

Then it’s the turn of the intercooler – which sits in its traditional position on top of the engine (fed, once in an Impreza, Legacy or Forester, by the similarly-traditional bonnet scoop) and its ancillaries, and finally some of the hoses and wires required to make the whole thing run.

Inevitably, a few pieces need loosening to fit others, since the assembly order isn’t always clear with more complex modern engines like this. But Davin’s not worried, and before he goes, we get a glimpse of the engine’s “test rig” – which might look like a pallet with a subframe, exhaust and a wiring loom on top, but… well it actually is that, but it should do the trick.

Keep an eye on the Hagerty YouTube channel for more videos from the Subaru EJ20 series and others, and head along to our Redline Rebuild page to catch previous episodes in the series.

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