D315 glow plug cylinder head machining

Ok thanks om.

I have a question about orienting the combustion chambers - at "what o'clock" should the glow plug be oriented, using that photo above?

My local caterpillar dealer called it indexing. Said you are locating glow plug out of the way of fuel line. By trial and error using different thicknesses of glow sealing seats until you find a location so fuel line and glow plug dosen't interfere with each other.

That's different thicknesses of precombustion chamber seats.

Ok, thanks, so he didn't give a particular angle, he just said set it to where it's clear. I guess each cylinder might have a different orientation anyway based on the fuel lines to it. I have a direct start D2 - I think it has glowplugs in it so I'll be interested to see how it's set up once I have it on-site

Caterpillar said can't get all the different thicknesses of seat seals anymore. I would think there are more options for seat availability with aftermarket. But,I was also told by very knowledgeable mechanics this is a situation we're only caterpillar seals should be used if possible.

I will try to clarify a bit better. If there are four different thicknesses of seat seals available, you would purchase a set of four for each cylinder. Install precombustion chambers one at a time using trial and error until your indexing is good enough. Most likely you will only get good enough, unless you get lucky. You only get what the shim thickness will allow.

That's different thicknesses of precombustion chamber seats.