you need a special tap, puller and install tool. Buy them or get a dealer to do it.
For valve clearance of Volvo d13a one needs to remove and re install injector cups.
Bad injector cups. Fairly common problem with Volvo engines.
Bad injector, head cracking, fuel system restriction, bad injector cups, or fuel pump seals.
Volvo motors - especially the D16 - have proven to be a bit problematic. It could be electrical issues, you could be experiencing problems with your injectors or injector cups, it could be a malfunction with the turbo... you really need to go to the Volvo dealership and have them run a diagnostic, unless you have either a laptop with the Volvo software or a compatible NexIQ system. I know it's not cheap, but it'll be a lot cheaper to diagnose and take care of the problem now than it will be to have something go asunder and deal with it when it's too late.
Usually bad injector cups. Leaking fuel seals, fuel system restriction, and bad injectors are other possibilities.
Cracked injector cups is the main cause of diesel in the cooling system. There is a special tool to remove them with out taking the head off.
Cracked injector cups.
first you must determine what is actually contaminating the coolant,usually in the detroit series 60 engine it is fuel oil,usually caused by faulty injector cups!
Sounds like your injector cups are on their way out.
Usually a sign of bad injector cups. Head cracking, bad fuel pump seals, faulty injectors, or fuel system restriction are other possibilities.
Bad injector cups are a common cause of this.
Bad injector cups, especially if it's a post-2002 vehicle.