I have a manual for a 3304. I’m not sure if it’s the same procedure or not that’s my main question. If not, what would the procedure be? Here’s a photo of the engine serial tag
The 83J plate on the engine indicates a D4D. Your thread title says 951B. Can you clarify what exactly you have please, just to avoid confusion.
That engine will be a D330 I think. Intake valve clearances 0.015" Exhaust valve clearances 0.025" The procedure in your 3304 engine manual will most probably work because the 3304 was developed from the D330. If there are any differences in the valve clearances between your manual and the above, use the numbers for the D330.
I posted the information you requested
Thank you sir