G'day Dean ,Speedy,Tyler ,Mf and Norm
I would prefer to use the Loctite non hardening gasket sealant than oil on the head gasket.
,the idea of oil is to make the gasket swell and stop the gasket sticking but sealant will give a
better longer lasting seal between the 2 surfaces.
I've used grease and oil on paper gaskets before but when sealants are readily available and work better ,then there are no good reasons
for not using a sealant. .
A gasket sealer offers extra protection against leaks. Holes or gaps between surfaces could create spaces for dust, solvents, or gases to get in or out. Gasket sealers ensure that the gaps between surfaces are filled to prevent leaks.
Gasket sealants strengthen the mating between two surfaces. Therefore, when used well, the seal becomes stronger and can last longer too. In addition, this also increases the longevity of the sealed parts.
The only Loctite I would use on these mower head bolts would be the Loctite non hardening gasket sealant.but that's up
to you if you use it or not.
Technically speaking you aren't meant to use metallic objects to clean alloy as they can scratch the alloy.
Never use a razor blade or anything that could scratch the surface. Any scratches may provide a channel or means for fluids or gasses to leak through. Use a brush or scrapper made of plastic or nylon, although it is probably best to use a chemical cleaner.
I have found no problems when using new metal scraper blades, if you're careful.
Cheers
Max
