Clatter at warm start

[Mb7]

23 Trx 30k miles, iv noticed recently on a warm start (after trucks been driven upto operating temp then started again within less than a hour) theres a loud clatter noise coming from the truck for about 20 seconds, has anyone delt with this? Normal? Thanks

 

[Louk]

Can you say what point the noise starts?
There appears to be “a” noise which starts then after that the classic cat tick starts.

Knowing nothing else just due to the truck being warm my first guess would be water pump?

 

[Mb7]

Can you say what point the noise starts?
There appears to be “a” noise which starts then after that the classic cat tick starts.

Knowing nothing else just due to the truck being warm my first guess would be water pump?

That weird background clatter right after it starts, i only hear it up until the cats chirp starts then its gone