rover power steer problem (Read 678 times)

[38gm]

hi all
just looking for any ideas as to why my power steering decides to over flow the reservoir after 6-7 laps of racing, pump then starts howling. fluid dosen't seem to be boiling. it is a rover 3.9 v8 we are using pump that come with the motor off a 1995 discovery.
any ideas ??
cheers

[ross]

Does the pump have its own reservoir? Is the steering box mounted higher than your pump? Sounds like its getting under pressure (and hot) and blowing out the oil, your reservoir needs to be up higher than your steering box. Easy way to fix it, just need more details.

[bigsparknz]

we had a similar prob with a super saloon turned out to be the pump was worn and was cavitating internally put new internals in it and all was cured

[38gm]

yes the box is higher than the pump, the pump does have a seperate reservoir which is mounted lower than the box we ran a different rover last year with the reservoir in about the same place but didn't have any probs, do you think raising the bottle and mounting a oil cooler would help??
cheers

[The Dark One]

Had simalar problen in my road car which is running a stage 3 spec 4.0L Ford motor, extractors were getting to warm on short runs and creating havoc, blowing oil everywhere and eventually leading to pump breakdown. fitted a nice alloy oil cooler and what do ya know no more problems... Same thing worked on the stockcar I used to crew for.

[Roaddog]

it sounds like a cavitating problem, having the pump and reservoir lower than the box won't be the problem I believe. I worked for P.G Hydraulics for 10 years, sounds like the pump will be rotating to fast you should run around 2-3 or even 4 to 1 ratio in a road car at 100kph you pull around 2000rpm I assume you are pulling between 6 and 8000rpm this cavitates the oil emptying the pump pushing the oil into the reservoir and not allowing the pump to refill it self as it is spinning to fast, pumps are gravity feed not presser raised back to the pump so the oil has to go somewhere. the pump will be noisy because it is airated and hot the rotor assembly will most likely be junk as it doesn't take long wear out with no or little oil give Phil or Greg a call at P.Gs they will advise you the best way to fix the problem 0800 steering or
09 274 5871 all the best.

[Autopete55]

Roaddog is on to it!!!
Run a 3-4 times bigger pulley on your pump than on the crank and your problems will dissapeer.!!!!!

[38gm]

thanks to every one for there input
new pulley being machined tomorrow.
cheers

[porry41]

if your rover pump is stuffed i can help u out with replacement one if ya get stuck defintly cavatation been there done that