No, many of the components are uprated abd some are only available to the marinised engine and while some may share the same dimensions between the auto, industrial, and marine engines and the components look the same, they are not and it comes down to different material specifications.
Most...
You can get repair kits for them and they include things like the brushes and the little masties which either break or wear out.
Never oil them, use a graphite stick or pencil to lugricate them.
Honestly, not worth it as the paint film is too thin and requires multiple coats which is expensive in time.
Brush and/or roller mean thick paint films and two coats will generally suffice with a decent finish.
First iissue is that they are NOT Renault engines and they are Saviem engines which are generally decent engines if maintained and their add on pieces will ne generic units adapted to fit and an adaptor may be needed to fot the oil cooler such as a step down adaptor from the engine to the cooler...
Have you considered the fact that thermal expansion causes issues, Portofino is on the right track here with the porous block and maybe onto something with the pressure testing as this needs doing twice, once cold and onc again at running temperature as different materials expand and contract at...
Dowty washers are designed for hydraulics and high pressures and as such are designed to be crushed slightly to seal them.
For your application I doubt you would get sufficient clamping torque to crush them so I wouls stick to a copper washer and get a pack as they cost very little.
Several issues here.
If you have an estate or hatchback you cannot legally carry petrol in them and in many cars with boots now you cannot carry petrol as the C&U regulations state you must have a steel bulkhead between the boot carrying the petrol and the passenger compartment and many saloons...
here are many factors at play and the fuel tanks made from metals can become hotter and colder and this creates condensation which can condense into water and fall to the bottom og your tank.
Water is always present in all diesel fuel and we have to accept it, what we dont know is the quantity...
I use a couple of professional units for the moulds or plugs for casting other materials such as metals or resins and as for the plastic usage, negliagable as you can use the plug many times to make anything from sand boxes to plaster casts.