Some details of the 2AZ-FE engine

Gonna write this stuff down and post it so I don't lose it.  Had
to wade through a lot of pages to find it.  The 5th Generation Camry's
2AZ-FE engine (an advanced powerplant, by the way) is
the same engine that was used in the '01 Highlander SUV.
5th Generation Camrys cover Model Years '02 - '06.

The cylinder block is made of aluminum alloy.  It uses aluminum
pistons, high-strength steel connecting rods and caps, forged steel
crankshaft, and, IIRC aluminum camshafts.  The VVT-i only works
on the intake camshaft, not the exhaust camshaft.  It varies
the timing of the intake valves.  There are two intake valves per
cylinder and two exhaust valves per cylinder.  Having two of
each increases the total ****t area, so more air can flow into
and out of the combustion chamber.  As the manual's authors
write, "Intake and exhaust efficiency has been increased due
to the larger total ****t areas."

The cylinder head cover (not to be confused with the cylinder
head) is made of magnesium alloy for lighter weight.  I think
cylinder head cover is synonymous with "valve cover," but the
Camry manual refers to it as the "cylinder head cover."

Since the manual doesn't mention what the cylinder head, itself,
is made of, I will assume iron, but just an assumption.

The cylinder head gasket, used between the aluminum engine block
and the (iron?) cylinder head is a steel-laminate type of
material.  Any concern about  electrolysis taking place between
the steel-laminate and aluminum?

When the service and repair manual says the dry weight of the
engine is 267 pounds, does that include the crankcase, crank,
cylinder head, and valve head with camshafts--or does the
weight only include the engine block without crankcase
and cyclinder head, etc.?

The crankshaft and camshafts are connected by a timing chain,
not a belt.

The oil pump is located behind the timing chain cover at the
front bottom of the engine, even lower than the crankshaft.  The oil
pump has
its own short section of chain that's connected to the
crankshaft.  Couldn't tell from the picture if this is a second,
dedicated chain, or just part of the larger chain that ascends to
the camshafts.  Double overhead cams, don't ya know (DOHC) :-)

If I had to guess, I'd say the oil pump has its own dedicated
short chain that's separate from the timing chain, ie., camshaft
chain..