Timing problem 1985 peugeot j5 motorhome

Is this them?

https://imgur.com/t/motorhomes/SMZ4lsS

https://www.google.com/search?q=1985+ford+serpentine+belt+diagram

https://www.google.com/search?q=1985+ford+replacement+serpentine+belts

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when replacing the pump if the timing belt has to be removed , it is not necessary to replace the belt PROVIDING THAT THE FOLLOWING PROCEDURE IS FOLLOWED
before removing the belt mark it with an arrow indication direction of movement replace the belt with the arrow correctly position as before removal
timing belts ( for want of a better description) breakin from running in a set direction
if replaced running in the reverse direction then the "breakin" gets far worse and early belt failure occurs
when the belt was replaced , if the cam seals , crank seals idler and hydraulic adjuster were not replaced then it might be worthwhile to have it done with the water pump as oil on a belt reduces the life to about 1/2

Anon, I am not familar with this vehicle, so I searched the net for horn replacement of your vehicle. Check the attached links,instruction and guides, Good luck
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If you Google this phrase:
Peugeot Symbol Motorhome 2198cc bhp
You will see many several sites that list it as 130 for turbo diesel to 100 for I don't know.
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run fault codes and check for cam / crank position sensor . Check that the cam shaft is turning ( broken timing belt/chain) check immobiliser is operational

OPEN THE AFM COVER SHORT PIN 1 AND 2. THIS IS THE PUMP SWITCH. TURN IGNITION KEY TO RUN POSITION. YOU SHOULD HEAR A WHIRRING SOUND FROM THE PUMP IN THE GAS TANK.
ALSO CHECK FUEL PUMP RELAY

Does it crank over? The battery you unhooked? It was one of the coach batteries right? It has a single battery for the engine and two for the coach?

You should be able to hear the pump in the tank running. If you don't check the fuel pump relay. If you hear the pump running then the line/filter could be plugged. The white relay is the tank selector relay, the green relay is the fuel pump relay. If the green relay is bad you will have a bad time getting the replacement. The new relays from the dealer and parts stores are all 5 pin. The green relay is a 4 pin.

Also your genset probably has a pump that pulls from that tank on its own.

front drivers side wheel arch,then remove the plastic cover ,adjuster is on the altenator ,its a right pigs ear to do

if the pump is 1 psi low it will cause this. I had this porblem on a 2003 chevy s10 and a new pump fixed it.