I'm not a mechanic / technician but I believe on a Ford DIESEL
V8 engine the cylinders are numbered :
firewall
7 - 8
5 - 6
3 - 4
1 - 2
front of vehicle
So , DRIVERS SIDE
Underneath the drive side driver seat.
6.9 liter diesel
7.3 liter diesel
In my 1986 F350, I replaced a the 6.9 diesel engine with a 1989 7.3 diesel engine. Everything fit. BUT I had to used the glow plug system from the 6.9 system
The diesel engine available in the 1984 Ford F-250 is a : ( 6.9 liter / 420 cubic inch / V8 diesel )
Ford: 7.3 diesel fuel getting into the radiator
Amsoil
In 2003, Ford introduced the 6.0-liter Power Stroke that replaced the 7.3-liter version.
15 quarts
400000
gas - V8 engine , 7.5 liter
Pictures of the Ford 2.4 liter Turbo diesel engine, can be obtained from most local libraries. Pictures of the diesel engine can also be found at most Ford dealerships.