Timing chain noise under load

[ChiliPalmer]

Hi.

I have a 450 petrol (700cc) which started making some rattling noise on start-up. The noise came from the timing chain so I had it replaced at a local shop. I picked up the car yesterday and noticed I hear noise coming from the chain when the car is under load. The mechanic also advised me to change the valve guide seals as the car leaves a smudge of carbon on when starting, in the morning. He said he could do the whole thing without removing the head.

I'm not very mechanically inclined so apologies if I make a stupid question, but could the engine timing be off? If so, would an oscilloscope test suffice to diagnose it? Is it really possible to change the timing chain and assure the timing is good without removing the head? What other questions would you ask the mechanic if you were in my shoes?

Thanks in advance for any help you can provide.

Edited June 15, 2022 by ChiliPalmer

[Willys]

Welcome to the site....

Check the oil pump chain and sprockets......they sometimes wear down to nothing causing this noise.    Research it, and yes if the work is being done to replace the timing chain do this at the same time....save labour costs!    You can buy these parts off Ebay or use....  

https://www.smart-ersatzteile.com/

They supplied me with every moving part within my engine when I rebuilt it, great guys.

[ChiliPalmer]

Hi Willys. Cheers!

 

The oil pump is brand new and so are the oil pump chains and sprockets. The kit I bought (SKF) had all the sprockets and both chains. I just talked to the mechanic and we took the car for a ride and incredibly the noise was not audible while he test drove it... Made me look like a right mug... He said the car was fine, but that was to be expected. He assured me that the timing is spot on. He pulled real hard on the car so I think the fact that the car became so hot so quickly might be linked to the noise. I'll conduct further "testing". Many thanks for the link though. Looks like a cracking shop.