Most of these head gaskets failed on the fire ring toward the pre heat chamber. This would blow combustion gasses into the push tube hole ( Lifter push rod area) . This hot gas would burn the oil in this area. Most times when you remove the oil filler cap on the valve cover you can see the carbon and black oil just by looking. The big issues is there are no external signs that there is an issue. They do use engine oil but other than that most times it is to late and the carbon does its job on the crank or oil pump.
If this happens and you catch it soon enough you then remove the engine and take off the oil pan, clean then check the oil pump to make sure it is not scored.
The mill came in for the crank support kit and service and alignment. There was another issue with the engine related to the throttle control sticking. It also has a cylinder leaking on the clamp.
It has over 4000 hours on this engine and the mill.
Even though I have seen these engines fail due to crank weakness and head gasket issues. When the engine started it makes you smile.
. It is a very simple engine. Even though it is a Perkins it purrs like a Cat.
You can tell if the 2.2 engine has the new gasket by looking for the rivet one will be on the front of the engine under the thermostat and the other one is on the opposite side in the back. If you can not see the rivet then you have the original gasket. I get the gaskets from Perkins with no issues. The valve cover and the timing cover has o- rings for gaskets and I have always reused them with no issues.
The engine is a 2.2 the 51 hp has no Turbo and the 62 has the turbo. I think some manufactures play with the hp specs for marketing.