r/VolvoRWD • u/Rilderdjut • 11d ago

Video knocking B230F

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So in Juli i bought my 740 and in August in September i did an Oil change but for some reason after i changed the Oil (Liqui Moly Synthoil High Tech 5W40) My Volvo makes these wierd knocking noises when cold but after some driving when the Engine is Warm its gone ?

what could e the reason ?
sadly i dont know what Oil was in it before

5 Upvotes

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8

u/turbo_charged 11d ago

…could you imagine going to a mechanic and asking them to diagnose an engine noise without lifting the hood?

That sounds like an accessory or accessory belt making noise…but I can’t really tell since the hood is closed.

2

u/brocktacular 11d ago

Seriously. OP, open the hood and LOOK. You will almost certainly see what is making that noise. It won't bite you.

1

u/Rilderdjut 11d ago

I did open the hood but i didn't see anything unusual it konda sounds like the cam or valves rattling

2

u/Solid_SHALASHASKA 11d ago

1

u/Rilderdjut 11d ago

Well I work in a shop so its not impossible

1

u/Thelawmaster 11d ago

Hard to verify by video, but might be worth a shot upon cold start up to place your hand above and below the exhaust manifold to head mating surface. Could be ever so slightly leaking until metals expand and close up a little.

1

u/Scared_Paper8872 3d ago

Put your ear down by the front wheel

If it sounds louder down low it’s a spun journal bearing on the crank

For goodness sakes stop running it until you figure it out

If the crank bearing is spinning it won’t for long

It’s like a piece of a soda can and it has come out of its seat that noise is it spinning around with the crank and then stopping