Below is a question I recieved from a fellow FChatter concerning the brake vaccum shaft... "Kerry, Help me understand why I simply can't take out or cut the splines off before it snaps? It sounds like the thing really doesn't do anything to speak of and I am thinking I will just disable it before it breaks. I am sure there is a downfall I just can't seem to figure out what it is. Thanks T" I sorta thought that was an interesting question and thought, "I'll ask the masses!"... Personally my response has always been that……… “It's common for the OEM brake system vacuum shafts to snap and then introduce metal shavings into the oil system/supply, inhibit oil supply to the driver’s side exhaust camshaft and valve train & compromise the braking efficiency of your Testarossa. It's not a matter of, "Will the OEM snap?", but, WHEN! The Ferrari OEM shaft is NOT available anymore, and to replace the shaft, you must replace the entire pump with Ferrari PN 170956, with a retail cost of $$3400+.” Just wondering what the communities opinions are..... Wondering Me Image Unavailable, Please Login Image Unavailable, Please Login
The classic symptom is no power brakes after start-up (especially at high altitude) -- as, unlike the carbed cars, the specific instruction is to not blip the throttle at start-up, nor is that needed on a properly working injected model.
I replaced this shaft and also turned the complete housing 90 ° have a look here: http://www.ferrarichat.com/forum/boxers-tr-m/386800-vacuum-pump-tr-2.html only positive is that after starting the engine has faster a vacuum and also when you drive only on a parking with idle and have to brake several times the vacuum is still there. but during driving it is no need for this pump because as soon as you close the trottle you have more vacuum than this pump ever will do
As I understand it, the pump is lubricated thru the small hole taking oil that is fed via the cam bearings. Remove the shaft, and the oil feed hole goes from small to large. Likewise, the oil in the cam bearings goes from high to low.... bearing lubrication may become an issue. Rgds, Vincenzo
Just bringng a dead thread back to life... The vacuum pump running off the drivers cam... Saw several threads where folks rotated it 90 degree's to decrease risk of it breaking... any point in doing that? My car has been through a multitude of majors at ferrari dealers and they always put in back together in the stock position... Also, saw markings on the end of the cam driving the pump and the cam housing, look like timing marks? Whats the point of those? Cam timing is set from the front, and is marked on the front of the motor. I assume the pump itself isnt "timed," its just put on. Anyone know before I start digging through the WSM again?
There are plenty of TRs running around with that pump broken. In fact I have one here right now with one snapped. Brakes felt fine to me..
Mine, isn't broken, looks fine. Just asking about preventative measures... So do you just put it back in the stock configuration? Seems the risk of running with it broken is that the oil pressure to that cam might be low...
If the vacuum pump shaft breaks, leave the splined end in the end of the exhaust cam. If it's gone, then I suggest finding a way to plug the end of the cam to control oil pressure and flow.
