maserati300
Junior Member
- Messages
- 78
Thanks to all for above posts. She's going in on Tuesday next week so we'll see what they say. Will update all once she's back on the road.
M300,
At least now you are armed with all the relevant figures, so nobody can do a snow job on you..??
Hi Ludwig - the alfa pump.....relay was fried so that was changed. that seemed to be why the pump burnt out. typical story really. sooooo glad i've got her back now. hope you get yours sorted quickly
The Pump Relay. Manufactured by Tyco/Siemens ... superceded by the upgradad V23134-B57-X152 ... this relay is also*supplied to BMW as an ABS relay, BMW Part No*6136-1393403, and can be purchased new for just over £18
It seems to me that some preventative maintenance might reduce instances of pump failure and in my opinion such maintenance may best apply to the relay.
The pump motor presents an inductive load to the relay contacts. When the load is removed (ie, when the contacts open) the back EMF generated by the pump motor coil causes an arc as the contacts separate. ... The arc causes the contacts to erode, and can also cause the contact to weld. So the pump either fails to operate, or continuously operates (and then burns out, I guess).
So regular replacement of the relay must surely reduce the possibility of pump failure.
I removed the relay from my 52-plate 4200 (38k miles) and dismantled it. I attach a photo of the contacts. You can see that one contact surface is very pitted. What you can't quite see is that the other contact is very eroded.
hello loz,
could you please confirm that I can take this "crossbeam" or whatever the right technical term is, away,
in order to get easier access to the pump.
Ludwig