2.25 Cylinder Head

Hi,
This is my second post so apologises if in the wrong place.
I am looking to rebuild my 2.25 Diesal 1973 Series 3 engine.
I have the head off and on inspection there is some pitting around and between the valves on number 4. There is also very small (just visible) cracks on the hotspot.
My question is what would cause this? I would be looking to use this head and get it tested and rebuild it. In others experience is this normal? Is it worth getting it tested or is the head beyond being saved and best to replace?
Thanks all in advance, James.

Pitting looks like normal age, corrosion and maybe some debris. Hotspots will nearly always crack eventually because of the heat cycling and design.
I'd get decent company to test it and see what they say. Or an exchange head (but don't use ACR landrover)

Was there damage on the top of #4 piston?

Thanks for the reply,
OK that's good to know. No there was no damage on the piston, they all looked good. Do they remove the pitting through skimming or a weld? Thanks for the heads up, I will take it to be tested.

Definitely won't weld it. Maybe face it off but that's a precision job . The hot spot have to protrude by a max .76mm and max recess of.025mm.
To be honest, the only place pitting matters on the seats and those will be recut anyway, so I wouldn't worry about it too much.

Seen a lot worse lapped and put back to work.

Get the, re cut and new hot spots and you will be fine, find yourself a good engineering shop.

Doubledig said:

Thanks for the reply,
OK that's good to know. No there was no damage on the piston, they all looked good. Do they remove the pitting through skimming or a weld? Thanks for the heads up, I will take it to be tested.

Click to expand...

unless the pitting crosses the fire ring surface i wouldnt worry just polish head with a wire wheel or very fine emery, ensure new hot spots protrude from head but not more than 2 thou