ZT 323-A oil pressure

Hello, need help.
Oil pressure in first head very low, not lubricate camshaft. Second head oil pressure ok. Cold engine oil pressure 4bar, hot 2.5-3.0 bar. Where search problem . Thanks.

ZT 323-A engine 4WD.

Hello!
You must cleaning all Filtres and the enging must get new Oil!
Or Ventil to reguliering is out of order??
Nice day
Ingo

Yes,I cleaning and change new oil filter (Mann) and new oil.
Where ist Ventil? You mind reduction Ventil regulate?
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Hello!
I send you an PM!
Ingo

Hello Arthur!
I´m also happy,that yor enginne is now ready !
All the best from Germany!!!
Ingo!

Thanks, regard form Lithuania.