Ducati Sporting Club UK > Model Specific - Discussion, Technical Problems and Help > Sport Touring: ST4 / ST3 / ST2 > oil pressure switch

[Glyn]

been having a few gremlins with the oil light on the bike.
so to try and eliminate the obviouse bought a new oil pressure switch.
compared to the old one the threaded part is slightly longer and when we tried to fit it it felt as though the last few threads were starting to chew so put the old one back in.
have checked the ducati part number and it is the right part
any one else had this?

[nelly]

Glyn, Check the sealing washer is in place. It's a thick alloy one. If it's still stuck to the bottom of the old switch, you could run out of thread.

[Glyn]

yep
ive got the alloy washer

comaring the new and old switch the new one is about ten mm longer thread

[KeefyB]

Originally posted by Glyn
yep
ive got the alloy washer

comaring the new and old switch the new one is about ten mm longer thread

10mm longer!!??
That cant be right surely??

[marko]

I was with Glyn and the thread is about 10mm longer the thread is made of Alluminium. when we tried to screw it in it felt as if the thread would strip

[KeefyB]

Hmm,I've just crossed ref'd the part no,(539.4.030.1A) against just about everything from a 600 Monster to a Multistrada and they are all the same.
I thought the 'modern' bikes like ST3,MTS,999 and the like had a differant wiring system?
Perhaps Ducati have changed the switch but not the part no?
Is the wiring connector the same as the old switch?

[marko]

I don't like the idea of both threads being aluminum. I was always told the threads should be of dissimilar metals when both threads are nonferous .

[Derek]

I changed the oil pressure switch twice on the 900ss in the 24000 miles I had it. First one worked erratically, the second one leaked at the terminal blade. Like KeefyB, as far as I can tell they are all the same and one for a Volkswagen Polo fits. The thread is 10mm x 1.0mm pitch and about 12mm in length. Costs about a Fiver from a motor factor.

[Glyn]

cheers folks
will try to get down to baines later
one quick question though. can any one confirm if the thread should be brass or alloy?

[Derek]

Originally posted by Glyn
cheers folks
will try to get down to baines later
one quick question though. can any one confirm if the thread should be brass or alloy?

The ones I fitted looked like mild steel with a plating of some sort - passivated cadmium or zinc maybe?
What ever kind you fit put a smear of copper grease on it before you fit it.