[RedArrow]

Yes Bob,
Volvo in fact had a tool for this, 9995235 (21)
or you could use modded headbolts. The four pins may have their own part number as 9995234 but I`m not sure at the very moment.

The four white little plastic pins/plugs have their outer ends threaded to go into the head smoothly (for fitment see illustration)... and the other end of the plastic pin is hollow and threaded inside as well, it is left-threaded BTW (to accept the `picker tool` then you can pull them out safely). Picture 4 shows this.

There are (at least,?) two kinds of headbolts used in the d24 family of engines, thinner ones are visible on left, the thicker 12mm ones are on the right. Their heads have been shaved/removed to properly fit `through`. There is still some thickness left of the top to use the headbolt-tool to install/remove these home-made `alignment pins`.


A 'Snap-on 12' tool is also pictured (used to handle the thicker later years headbolts) /right side, 5th picture/