if you mean when installing a timing chain, the keyway or square notch should be at 12 oclock and the mark should be at 3 oclock
mine has a ka24e(2.4 inline 4 single cam)
>>"What type of valves does a 1989 Nissan 240SX have?" what exactly are you asking? the factory motor for the 240sx's, years '89-'90, is the KA24E, single cam, 2.4 liters, 12 valve. It has two intake valves, and one output valve.
the cam gear and the crank gear are dot to dot
On the 1989-1990 240sx with the KA24E single overhead cam engine the E.C.C.S. is located on the top left side of the engine behind the throttle body and on top of the intake manifold.
It will fit if you cut it but as-is it will not attach to the throttle body. The 1989-1990 240's have the KA24e (single cam) and the 1991-1994 240's have the KA24de (dual cam) the throttle bodies are in different positions.
The crank gear should be in the 12: oclock position & the cam gear should be in the 6: oclock position facing each other this is top dead center on compression stroke.
you can do it either way #1or #6 for number one cylinde your dot on the cam needs Tobe on 12o;clock if the dots are together you need to strat at number#6 your crank is always at 12;o;clock
Point the intake cam lobe down and the timing mark on the cam gear at the 12 o clock position with the piston at TDC.
Behind the cam gear
"What is the VVT Cam Gear Unit?"
It is behind and underneath the cam shaft gear.
Depending on manufacturer and engine size the location on a cam shaft and firing order is registered through a magnet or sensor located on a cam gear those sensors are usually called a cam position sensor.If your car does not have a cam position sensor the next way to determine is by the crank position sensor.The crank position sensors purpose is to make sure that the crank and cam stay alligned.All this is monitored through the PCM or computer on your vehicle.