Problem noise sound

[BrownieIT]

Hi guys, I would like to ask you for information, today I turned on my r33 gtst and around 2000-2500 rpm I hear this strange noise, I don't understand if it's the belt, can anyone help me?

[r32-25t]

Sounds like the balancer hitting the bottom cover 

[BrownieIT]

 

4 minutes ago, r32-25t said:

Sounds like the balancer hitting the bottom cover 

what could i do to fix the problem?  thank you very much for helping

[r32-25t]

Making sure all the bolts are in and the rubber bits are on the bolts 

[BK]

If not easy fix like above with the lower cover just being loose or bent, the worst case is another example of the lower timing belt gear and washer sheilds being compressed. When this happens the balancer will indeed touch the cover no matter what as the balancer has moved further inwards. This is usually an RB26 or high revving engine problem though but can still be caused by reusing the timing gear assembly when it should be replaced.

The lower timing gear assembly compressing is precisely why Ross and Nitto developed hardened sheilds / gear that don't compress like the factory stuff.

[Dasmbo]

Use  a long screw drive or something like on and use it a a stethescope and press it on to several different parts of the front covers to determine where the noise is coming from it does sound like some sort of interference of one of the front covers. What condition is your timing belt in hope its not starting to desintergrate as i dont know what condition your engine is in and how many kms it has done for the engine all of a sudden starting to make this noise i would be removing the top cover and inspecting that space and rotating the engine to inspect the belt because if it breaks you will need deep pockets to fix

[BK]

20 minutes ago, Dasmbo said:

Use  a long screw drive or something like on and use it a a stethescope and press it on to several different parts of the front covers to determine where the noise is coming from it does sound like some sort of interference of one of the front covers. What condition is your timing belt in hope its not starting to desintergrate as i dont know what condition your engine is in and how many kms it has done for the engine all of a sudden starting to make this noise i would be removing the top cover and inspecting that space and rotating the engine to inspect the belt because if it breaks you will need deep pockets to fix

When was the last time you've actually seen an RB timing belt break ? That said if you don't know the age or condition of the timing belt on your car it should be changed out anyway.

[trel]

My old 33 did that right before the balancer munched itself and took the engine with it. This relates to too much limiter bashing.  I'd remove the balancer and have a look at your snout. If there's no damage you might be lucky.

[BK]

5 hours ago, trel said:

My old 33 did that right before the balancer munched itself and took the engine with it. This relates to too much limiter bashing.  I'd remove the balancer and have a look at your snout. If there's no damage you might be lucky.

Did what, broke a belt or the balancer reducing clearance to cover and hitting issue ?

Regarding breaking balancers I can absolutely relate. I had a stocker balancer destroy itself and take the engine with it too. Wrecked everything - cracked block, cracked crank and damaged pistons.

[Dasmbo]

38 minutes ago, BK said:

When was the last time you've actually seen an RB timing belt break ? That said if you don't know the age or condition of the timing belt on your car it should be changed out anyway.

About 3yrs ago the timing belt shedded on my VK holden RB30/25 reason unknown belt replaced no problems since also have a r33 RB25 and never had any problem with it i mostly answere question in which i have had personal problems with VK i have had for 27 years r33 had for 15 years so i have done a lot of kms with them

[tridentt150v]

If your HB is wobbling at all, its f'ked.  Think about doing a kit job.....if your water pump etc are also 'vintage' then do the whole belt, pump, idler etc at the same time [unless they have only recently been done].