Isuzu C 190 Diesel Engine?

I am Looking for valve Clearances For c 190 Isuzu Diesel Engine. At the time the intake valves are all around 0.020" and the exhaust valves are all around 0.030". The Glow Plugs Are in good working condition. Once engine is running it has lots of power. However with engine warm, it still has a difficult engine starting. On a cold start there is smoke from exhaust.

Due to difficult starting Issue when hot or cold.

Thankyou