Fair enough. Though bare with me here (I can be thick lol) as I'm trying to understand their reasoning. Pressure testing a head involves pressurising the water jacket (with water or air) to find if there are leaks afaik. The cooling system runs at the same pressure (about 15 psi) regardless if it is turbo or not. If they can't replicate that they're in the wrong line of work?
The (likely) most relevant pressure for a cracked head in usage would be from compression (gases entering the cooling system causing overheating). Older non turbo diesels generally had a much higher compression ratio, so would be worse for this than a modern turbo diesel anyway as far as I know (which admittedly isn't that much).
I can see where they might not think it worthwhile, they're non repairable if cracked so if you've already got the head off just change it. They rarely ever seem to do a head gasket anyway, so it might not be considered worth bothering with.
The (likely) most relevant pressure for a cracked head in usage would be from compression (gases entering the cooling system causing overheating). Older non turbo diesels generally had a much higher compression ratio, so would be worse for this than a modern turbo diesel anyway as far as I know (which admittedly isn't that much).
I can see where they might not think it worthwhile, they're non repairable if cracked so if you've already got the head off just change it. They rarely ever seem to do a head gasket anyway, so it might not be considered worth bothering with.
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