R33 S2 Rb25det Noise From Timing Belt Cover

[ADM33T]

Hi All,

So hoping to be pointed in the right direction before I go opening things up.

So here are the symptom's:

Upon start up after approx. 4-6mins of normal idle there is like a "grinding noise" that comes directly behind the CAS and on top of the cover, when it is there you can also feel the vibration of the cover kind off.

it happens intermittently so it could be there for like 10secs stop then after 1min it come back for like 30sec then stop and so on and so on. it goes away when the throttle cable is pulled and revs increases, release the cable then its back with in 20-40secs.

it only does it after it has warmed up from a fresh start.

Also to add the water pump and timing belt has only been replaced approx. 6 weeks ago.

Hoping to be pointed in the right direction of what to look for when I open the cover up.

Thanks.

[The Bogan]

Silly question, were the idler pulleys replaced.

[ADM33T]

ummmmm.......good question.

Are the idler pulleys generally part of the kit for the timing belt or they are purchased separately ?

If they are purchased separately then I would say no they may not have been done.

[The Bogan]

I would ask who did the belt, you can replace the belt by itself , BUT, generally you replace the belt, pulleys and water pump at the same time.

Or at least that's what I do when a timing belt needs doing.

[ADM33T]

Once I take the cover off I should be able pin point it better I think.

Just trying to gauge what I should be looking for.

[89CAL]

dodgy bearing in the CAS is my guess

Only because I've had the same thing happen. Took the cover off, everything was fine, put the cover on, sounded crap. thought it was the cover vibrating, one day pulled the CAS out and tried to spin it and it felt like the balls were cubes in the bearing

Pull the cover off anyway, see if you can pinpoint anything first

[hy_rpm]

I would guess

The belt tension was overtightened or if you using one of those gates racing belts

if the noise only occured once the belt was replaced

[ADM33T]

Thanks I will check the CAS

I must add it was a few weeks after the belt was done, not immediately after.

Also been told exact same thing 89cal has mentioned so I will be checking that out shortly.