Ok I admit I don't know a lot about the B234F but from what I have read in the last 5 minutes, Yes, there were some cases of oil pump bolt failures. However, there is an upgraded bolt if you are concerned.
"The replacement bolt is Volvo p/n 948472, an extra strong metric 10.9 class M10 x 1.5 mm (standard thread) x 30 mm long bolt including a flat washer (Volvo p/n 960148). This appears to be an upgrade from the original class 8.8 25.4 mm long bolt which should reduce or eliminate the incidence of failure"
I also read that others have just replaced the bolt with 8.8 high strength bolts for peace of mind.
Same with the gear, there is an early and later, upgraded version and also later versions have hydraulic tensioners which were better than the early manual tensioners.
Removing the balance shafts also appears to be a common mod for them.
I'm sure they would be able to be built for reliability.
"The replacement bolt is Volvo p/n 948472, an extra strong metric 10.9 class M10 x 1.5 mm (standard thread) x 30 mm long bolt including a flat washer (Volvo p/n 960148). This appears to be an upgrade from the original class 8.8 25.4 mm long bolt which should reduce or eliminate the incidence of failure"
I also read that others have just replaced the bolt with 8.8 high strength bolts for peace of mind.
Same with the gear, there is an early and later, upgraded version and also later versions have hydraulic tensioners which were better than the early manual tensioners.
Removing the balance shafts also appears to be a common mod for them.
I'm sure they would be able to be built for reliability.