Peugeot 505 1. does the starter turn over from the key but the engine doesnt turn over? 2. is your car manual or automatic? 3. is this a starting fault or is it a none running fault? !. Yes 2. Automatic. Engine built into a boat, 3. The engine does not fire. The starter motor goes like crazy but the engine does not turn over. Someone suggested the crankshaft is gone?

Peugeot Service Repair Owners Manuals - Page1

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PEUGEOT 205 GL GE VAN SR GT 1.6 GTI 1.9 GTI DIGITAL WORKSHOP REPAIRMANUAL ... PEUGEOT 205 PDF SERVICE REPAIR WORKSHOP MANUAL 1984-1997 ... PEUGEOT 505 SERVICE REPAIR MANUAL DOWNLOAD 1979-1993.

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these engines with manual rockers had wider than usual settings as i remember ,but set to around 12 th inlet and 15th exhaust and you be far out and check for wear under the actual tappet and if excessive then renew as parts still available but the settings i give should stop the noisy exhaust tappets these cars are famous for

This may be due to a bad neutral safety switch, is this car automatic or manual transmission?

If automatic try to start in neutral and if manual try to locate switch on clutch pedal and use a jumper wire to jump connector for switch, NOTE; If switch is jumped car will start in gear with pedal not pushed down and car will take off so this is just as a test not a repair!!!!!, good day

clean out the engine breather system as if the gauze filter is gummed up this will make it leak oil due to internal pressure build up .if this doesnt work then its a complete engine rebuild

Since you have power to your accessories, here are a few more things to consider:
1: Automatic transmission not in park or the neutral safety switch is faulty
2: On manual transmissions clutch pedal not depressed or or clutch start switch failure
3: Broken or loose wires in the starting circuit. Inspect all wires and connectors at the battery, starter solenoid, and ignition switch
4: Starter motor pinion jammed in flywheel ring gear. Manual transmission. place transmission in gear and rock the vehicle to manually turn the engine. Remove starter and inspect pinion and flywheel

If everything else works when you turn the ignition switch "on", but the starter will not engage, it could be one of three things:
1) Ignition switch is defective
2) Starter is defective
3) If it is an automatic, the starter interlock may be faulty.

The best way to check the starter is to remove it for testing. Remove the starter (3 bolts) and take it to your local auto parts store for testing. Be careful and support the engine from below with jack stands as one of the starter mounting bolts is also an engine mounting bolt.

If the starter tests OK, then it may be option 2 or 3 (above). If the car is an automatic, try cranking it in "N". This will tell you if there is any sort of starter interlock problem. If this fails, or if the car is not automatic, then the ignition switch is most likely the culprit.

I hope that this information helps!

Soudn like starter problem; chec battery charge and tell us news.

Sounds like a flakey connector - try hunting down all the connectors you can find under the bonnet. Separate them, spray with WD40 and reconnect. Start at the engine management computer (silver block with fins on and lots of wires coming out). Take great care not to bend pins.