1 to 4 , front to rear
Yes I believe actually the 1986 to 1992 Volvo 240 4 doors are all interchangeable parts but I'm not sure for 1985 and earlier models.
Yes
Not 100% sure about the '87, but there is no PCV valve on the 1986 Volvo 240 2.3L. Flame trap and Oil trap, but no PCV.
No, they are not user serviceable
Dextron D/M
Piston rings and/or (probably and) cylinder walls are damaged. Rebuild the engine.
Yes. They are exactly the same as long as the newer wagon is also a 240 (not a 740). All 240 hoods are interchangeable from 1986 on.
Call Crutchfield. They have the installation kit, diagrams and instructions.
long answer: yes
Intank fuel pump and/or airflow meter also break system check valve.
Yes the 240 does have fuses. Was that your ?.
how do adjust timing belt on a volvo 240 DL ?