520i water pump mystery
After having just fitted a new water pump to my 1984 520i, we noticed on the old water pump, a spring, loosely fitting around a steel rod which looks a bit like a leather punch, both measuring 6cm long. On the water pump near the top, there is a groove which one end of this spring/rod cradles into. The other end pushes firmly against another part of the motor next to the water pump - you guessed it, 6 cm away. Neither ends of the rod or spring are held with any fasteners but the tight fit just seems to hold it there, leaning downwards on a 45 degree angle from the pump, and has done so through it's years of travel on some pretty rough roads - running over potholes, unseen speed humps, and the occasional cat (NO -- JUST KIDDING !!)
Anyway, after skimming through various forums and info I read about a spring which the author called a tension rod; then a stabiliser spring; finally something was mentioned about an anti-knock device which was described as a springy thing.
Can anyone settle our curiousity please? The new water pump did not come with any such accessories so we'd like to know if this is a neccessity which I've a feeling it is.
Have a great day all.