Perkins 4.154 manual, handbook & parts manuals can be found here:
There are 2 versions of the Perkins 4.154. First one was US made and the more common one was Mazda. Look to see what fuel pump is on the engine. If it is a Diesel Kiki, it's a Mazda. Same as the one used in Mazda pick ups around the world.
The people at Trans Atlantic Diesel are very knowledgeable about parts and repairs and workarounds.