Depends entirely on the likely grade of road you're towing on. Also if trailer has brakes fitted - need those for safety with heavier loads.
how do adjust timing belt on a volvo 240 DL ?
5x108mm
If they're identical, yes. Try it and find out.
how can i repair a wirie taht has been broken from alternator to wiring harness on 1990 volvo 240?
no
The oil pan is bolted to the bottom of the engine
Under the hood by the left hood hinge.
That's correct it's electronic.
1 - 3 - 4 - 2 The distributor rotor turns CLOCKWISE
1 - 3 - 4 - 2 The distributor rotor turns CLOCKWISE
Worn brushes, bad Regulator, or Likely a bad connection or wiring.