Sound after timing belt change

[deus85]

Hello there,

After I changed all my belts and the water pump on a V6 auto with 90k miles and the engine started making a roaring sound. Its a constant roar that really gets loud at about 40mph and up. The engine feels greating driving, but just that constant roar...someone sitting in the passenger seat thought I had installed a new muffler. It could be described as a humming sound.

I've been driving it for about 2000 miles now.

What do you think it could be? Everything feels great except that roar. Thanks!

[toyomoho]

If the noise (hum) started when after you changed belt and WP this would be the logical place to start. Use a piece of rubber hose as stethoscope to check for noise in the belt area. Belt might be hitting something, belt slap, etc.

[deus85]

Hmm, I know that the volume of the humming increases as the MPH increases. At idle and below 40mph it feels like a normal engine running.

[marc780]

Maybe the belt is rubbing on the timing belt cover someplace? IF you could record it or post a video with sound on youtube or something it might help some people to help you figure out what the roaring is.

[deus85]

Hey thank you all for trying to help me get down to the bottom of this.

I had my tires replaced and the guy said its my front bearings going wrong.
Then I went out with a friend one day, and he told me its the rear right bearing.
I replaced that and the noise got better, but was still there.
Finally, the guy who put the bearing into the hub for me said its the rear left.
I replaced that, and my two months agony was fixed.

It was difficult to pinpoint where the humming was coming from.
Sitting in the rear I could hear the other rotating sound (indication of the bad bearing), but I could not figure out the humming.

Coincidentally, the sounds started right after I finished my timing belt/water pump change.
BTW for those of you who do your own work, the rear bearings do not need to be replaced with the hub assembly. I know the manuals said so, but mine was pulled out, and pressed in successfully, and now my car drives great. Very easy DIY.

Unfortunately, I had an allignment done, and Firestone told me both my front inner tie rod ends are getting bad. Thats the next project....