Hi,

This photo illustrates the rear side of the engine in a Civic Si,
1990. The intake manifold has been removed and the red gasket remains
on the head. The connection for the oil filter is in the lower left.
http://easthope.ca/CivicSi1990EngineRear.jpg

Will someone please explain two parts which I haven't yet found in the
Haynes manual.

(1) The steel tube, about 2 cm diameter, running across the block
above the oil filter connection.

(2) The object on the right side of the oil filter connection.
Approximately square shaped with round corners and a rubber surface.

Thanks, ... Peter E.

 

In Haynes manual 42023, _Honda Civic '84 thru '91_, page 3-4, illustration "3.10 Thermostat and associated
components - exploded view" the steel tube is part "7 Water pump inlet pipe".

That part still baffles me. A cover of a breather or vent? In the photo referenced in my original post, it is below the inlet tube and right of the oil filter connection.

Regards, ... Peter E.