Bill111- None taken,
you have my PM on the matter.
"On The Rocks"- Thankful you are having this level of success with you engines. It appears that I asked for and received supportive posts for these engines.
Our engine is performing at a wonderful level outside of the leaking main seal
As you can see in above Billy111's post he is asking specifically about the Mazda Perkins. This is an example of what drives my concern. Our Perkins engine was manufactured somewhere between 1960 and 1966. Following that Perkins allowed another manufacture to use the engine. I don't know the sequence of ownership as it includes Caterpillar, Mazea, Westenbeke, Massey Ferguson to name a few.
To what I can ascertain some of these if not all, made minor adjustments to the original 4-154 configuration by Perkins. You seemingly receive "Hummm" Aaaaaaa" and "I am not sure" when you make inquiry as to the adaptation of parts you locate to the ability of those parts to interchange.
Not the case with the 4-107/108/236/ four bangers. Perkins retained control over these engines or that seems the picture I am hearing.
I have no grief with the W58 Westenbeke engine (Mazda) that I purchased as a replacement when that time comes around. I am fairly sure that I can use my Perkins bell housing including the starter, and the Velvet drive reduction gear.
I'd hope that by indications, the Perkins heat exchanger will bolt up to the Mazda block. With those adaptations, I am confident that Westenbeke has current inventory somewhere on replacement parts for the remaining requirements.
Trust this will clear up the intent of my advise to potential Perkins 4-154 ownership. Parts may be available to the extent that you will have to established a relationship with sources now for then.
Seeking them when the trouble develops will lead to a level of frustrations. For that reason I have taken a "Belt and Suspender" attitude in purchasing a newer model of the 4-154 a bit different.
Al-Ketchikan (Bridge to Nowhere) Alaska