Valve clearances on Volvo Penta 2020D

[suibhne]

Valve clearances on Volvo Penta  2020D

My previous boat had a Volvo Penta 2002 Engine
The valve clearances were a user serviceable item
It made quite a difference to the starting and smooth running of the engine.
I find that the same operation is not now a user serviceable procedure.
The valve clearance must be left to engine expert mechanics apparently.
Is there some reason for this?
Have any readers attempted to do it themselves anyway?

[Andyh]

No reason for this at all, they are a simple adjustment using a screwdriver and spanner, no buckets and shims....a very old fashioned and simple design.