HELLO again guys i have a constant tapping comming from top of engine, from threads iv'e read it seem it's a weak lifter possibly caused by a damaged o.ring.
can anyone tell me where these o.rings are situated on the engine ?
many thanks 4 info
andysvolvo
oh P.S i have changed oil twice in 30 days it still taps

 

https://volvoforums.com/m_6169/tm.htm
Read that post it should help.

 

O rings are in the OIL pan, (where else)a messy 2 hour+ job.
Meanwhile try some LUCAS engine additive, when you do your NEXT oil change, sometimes the stuff actually works!