I have been passed this to try to identfy/ repair where a bearing screeching noise is coming from.





The history is (that i been told) taxi driver bought this from local Mazda dealers 3 months ago, driving along last week and this noise just started, instantley. He took it back to them but they refused to look at it on warrinty i guess as he had not told them of its intended use.

The oil level was slightly high so i drain it of and replaced.

So far auxillary belt is removed, cam belt has been off and there is no play or noticble noise from the

waterpump, or tensioner or idoler pulleys.

The fuel pump does feel tight in 2 spots around its 360 degree rotation, I assume from the piston/vanescompressing diesel. Allthough from memory are these Denso pumps ment to be tight? Just rotated a bosh HP pump and its not tight.

I have removed the turbo air feed pipe and felt the turbo shaft for end play and there is no excessive play.

With a stethascope the noise is more apparent towards the front of the engine around the fuel rail.

But it does resonate all around the engine.

Im hoping someone may have come across this before, and maybe its fuel resonating in the rail.

Also no fault codes with IDS and rail pressure and injector corrections all look good in data logger.

As allways any input is welcome.