Oxygen sensor and brakes

I've got a 92 Lumina with the 3.1 v6 in it. Poor old car seems to be hitting it's threshhold at 179k miles and needs some work. Amazingly, with that many miles, it's minor things. I've only had one other car that I've ever put more miles on (76 toyota celica gt, had 238k when I sold it).

What I need to know is, does the engine need to be rotated forward to replace the oxygen sensor? I took a quick glance while I was at work yesterday, and didn't see it. By using the online manual at autozone (how cool is that? Didn't have to buy a Haynes manual, yet), I found where it is supposed to be (passenger side, rear of engine). The thing is, I've never had to work on a car with new doo-dads like o2 sensors, so I don't really know where they are other than "on the exhaust manifold".

The other question regards changing the brake pads on the front. If I understand the setup right, there is a hex bolt that will need to be released to get the calipers to come free. Does anyone know what size that is? I've seen 7mm, but would like it confirmed if anyone knows.

Sorry for the newbie questions, but the newest car I've done extensive work on was the 76 celica. The only car I've done tear-down and rebuild on is a 69 Chevelle, and well, other than "yeah, they both have enigines", there's not a lot of similarity.

I thought they were torx bolts on those older ones, seems like they were T-45, but it's been a while since I worked on one. If it is, save yourself some time and buy two sockets, they are all crap and usually break trying to loosen the bolts. Then if it doesn't, just take one back.

Yes, you could pitch the motor forward to gain some room to work. It's easy to do.

I've got a 92 Lumina with the 3.1 v6 in it. Poor old car seems to be hitting it's threshhold at 179k miles and needs some work. Amazingly, with that many miles, it's minor things. I've only had one other car that I've ever put more miles on (76 toyota celica gt, had 238k when I sold it).

What I need to know is, does the engine need to be rotated forward to replace the oxygen sensor? I took a quick glance while I was at work yesterday, and didn't see it. By using the online manual at autozone (how cool is that? Didn't have to buy a Haynes manual, yet), I found where it is supposed to be (passenger side, rear of engine). The thing is, I've never had to work on a car with new doo-dads like o2 sensors, so I don't really know where they are other than "on the exhaust manifold".

The other question regards changing the brake pads on the front. If I understand the setup right, there is a hex bolt that will need to be released to get the calipers to come free. Does anyone know what size that is? I've seen 7mm, but would like it confirmed if anyone knows.

Sorry for the newbie questions, but the newest car I've done extensive work on was the 76 celica. The only car I've done tear-down and rebuild on is a 69 Chevelle, and well, other than "yeah, they both have enigines", there's not a lot of similarity.

I am pretty sure the caliper torx bolts are T60, i bought one for mine, but without looking, i am not sure, if you say you really want to know for sure, post back and ill look.

As for o2 sensors, they are to tall for a regular socket plus have a wire out the end, if you are sure you can get it out, you can snap the small tall part off and use a regular 6 pt socket to remove it. They make 02 sockets just for this purpose, but most i ever had to do was use a 12 inch pipe wrench on a real stubborn one, and make sure the new one has the anti sieze with it, dont use anything but the stuff that comes with it as other anti sieze compounds might stop it from making a good ground on the threads, stuff that comes with it is electric conductive type. Some has the anti sieze already on the threads, other in a little squeeze on plastic envelope

It is for sure a T60

It's a T-60 for sure, I bought one at Sears a while ago. :)

Hey, you don't have to take out the calipers to change the pads! :nono:

Hey, you don't have to take out the calipers to change the pads! :nono:

Duh..... thats right, i was changing rotors and pads..