plannin on installing my udp tonight since its been sittin there for months now, already bought the belts. question is; is that front oil seal (o-ring or whatever) needed to be changed as well?, i mean my car doesnt leak no oil, but somebody told me that i gotta change it when i am doin the pulley....
some helpful tips would be appreciated, remember its a 96 auto...

 

you dont have to change it, but what better time than when that pulley is off.

Its a judgement call, if its not leaking and looks like its still in good shape. . . . .

 

i have heard that its good to change the belts but you dont have to

 

and one more thing just came to my mind, that is the whole shaft going to rotate when i try to loosen the bolt cuz i am gonna use a big breaker bar , if its goin to then is there anyway to stop it or something?

and thanks guyz....

 

Step very hard on the brakes, is one method.

 

Under drive pulleys suck. I had one on my 240 and the front seal blew out because it was so poorly balanced. Have fun with it, Your car will have less cooling and charging and will be out of balance due to the pulley.

 

UDP = yes you DO have to change the belts

 

The Maxima crank is balanced, not the pulley newbie
less cooling????