Sn 89 noise

[redpiranha]

I Recently purchased a 90 mustang with an sn89 on it . The car only has 51k original miles on it and and the paxton has been on there for almost 30k of that . It also has a fluid cooler on it as well added after about half of those miles . I have not had a boost gauge on it yet but it seems to be working well enough. It also has the original pulley sizes installed so it was never overspun . My question is about a rattling noise at idle after it has warmed up . I remember this car when it was 1st installed as I did the installtion and i don't remember it being this loud . Is the rattling a big problem or normal wear ? also can I continue to run it or should i pull it off now to stop any damage . The fluid was changed on a regular basis also and the car was never really hammered on . Thanks in advance.

[pavement pounde]

On low idle it may rattle a litle bit, if you up the idle to lets say 900+ rpm is it gone then ?
There is always a little room between the ballcarier and balls, if it does it at cruise and higher then idle then you need to replace the ballcarier.

[whodwho]

Probably the oil pump rattle and why they put a spring around it to load them to the side on later models

[pavement pounde]

That to, I tottaly forgot about that.....

[redpiranha]

It definatly goes away above an idle . It sounds fine under cruise . i'm just a little jumpy because it has so many miles on it. I don't want to make anything worse if there is an issue . I'd like to take it to the track in a couple of weeks but if there is already a problem i just did not want to make it any worse . I'm about to upgrade the cooler from the little power steering one to a full size stack plate tranny cooler with 6an lines. Thanks for your replies i feel a little better about the unit now. Although I'll probably rebuild it as soon as $ allows.:blob: Can I add the spring around the pump on this unit ? Has anyone done it ?