Note: These are some awesome DIY postings found on an Italian website with literal translations from Google so please bare with the imperfect English.
The Original posting is here to give credit where credit is due.
http://www.cinquino.net/topic.asp?TOPIC_ID=1516

Cleaning the oil flinger.
Tools needed
- pipe wrench #10
- container to drain oil
Inside the motor of 500 oil is filtered through two components:
1 - The retina at the start of the oil suction tube,
2 - The centrifugal filter.
The 500 does not have a cartridge filter, but a centrifugal Slinger that causes the oil and heavy impurities to get stuck to the wall + the Slinger.
Then the flow continues into the crankshaft via the camshaft axis reaches the cylinder banks and the oil sensor and then continues ... ... continues to fall in the cup from the valve cover.
PROCEDURE - With a key #10 removed the 6 nuts that hold the lid of the centrifuge (see photo), put a container under the lid to catch the oil trapped in the Slinger, under this cover you will find the real Slinger. Dis-assembly of the centrifugal device involves the extraction of the locking nut, the nut is tightened with a high torque and therefore not easy to remove.

- Check the walls of the slinger and the walls of the lid that there is no residual sludge (see photo) if there is scrape the layer of loose dirt with a screwdriver and clean with a rag soaked in oil. Be careful not to leave any strands of cloth in the slinger, it could block the flow of oil causing engine damage.
- Once cleaned reassemble the cap of the slinger putting a new gasket.
The correct mounting position of the cap is manditory because it carries on its surface a references to the ignition timing (TDC) (see photo). [More]
Note: These are some awesome DIY postings found on an Italian website with literal translations from Google so please bare with the imperfect English.
The Original posting is here to give credit where credit is due.
http://www.cinquino.net/topic.asp?TOPIC_ID=2706

Lower your Fiat 500 by modifying your leaf springs
Finally I will explain how to flip around your crossbow leaf spring to give your car a lower profile without it being lowered way too much. With this job you will have a happy medium.
This was a technique used many years ago before they came out with those aftermarket lowering springs, for many it was too low.
With this job you will have a middle way.
I will Start by saying that if the crossbow is to be thrown away, the job will come out bad! So if thats the case buy a new one first.
So here is how the crossbow appears in my Nuova original Fiat, slightly oxidized

Here we must first remove the clamps that hold the outer leaves of the crossbow, To do this all you need is.... [More]
Note: These are some awesome DIY postings found on an Italian website with literal translations from Google so please bare with the imperfect English.
The Original posting is here to give credit where credit is due.
http://www.cinquino.net/topic.asp?TOPIC_ID=2706

Disassembling the engine and gearbox from the 500
Materials:
- car jack,
- 2 jack stands,
- ratchet or wrenches # 7-8-10-13-17,
- Phillips screwdriver,
- large flat head screwdriver and a small on,
- pliers,
Raise up the back of the 500 and place it on the 2 jack stands high enough so you can get under it to work.
Disconnect the negative battery cable and unscrew the fuel cap to relieve the pressure.
1 - Open the hood, disconnect the wire of the license plate light, and the cable that holds the hood. Close the lid and unscrew the nut with a #10 wrench, and then remove it.
2 - Disconnect the wires from the spark plugs and remove the distributor cap, as well as the small ground wire that connects to the body with a #8 wrench shown below p.11

3 - Remove the belt guard heat shields where you see marked with 2 yellow dots....... [More]