Skylark L4-144 2.4L DOHC VIN T SFI (1997)
Camshaft: Description and Operation
Two camshafts are used, one for all intake valves, the other for all exhaust valves. The camshafts are cast iron. The intake camshaft had a pressed-in hex
insert. The hex inset is used to drive the direct drive power steering pump. The intake camshaft also has the camshaft position sensor lobe cast onto it.
HOUSINGS AND COVERS
The camshaft housings and covers are cast aluminum. The camshafts run directly on the housings and covers without bearing inserts.
CAMSHAFT DRIVE
An inverted tooth chain is used. A hydraulic tensioner and three guides control chain motion. The crankshaft and camshaft sprockets are powdered
metal. The coolant pump sprocket, which acts as the timing chain idler sprocket, is steel.