Might try contacting the yard and/or designer
from whose board she sprang. Additionally I would bet that Perkins or the builder
....would possibly have somewhere in their archives
information about possibly whose transmission and drive it is.
One other suggestion. Contact Perkins, explain the situation and ask them about installation of a pyrometer in the exhaust manifold or the elbow
before you go into the seawater riser...... I considered this in my last boat but never did it. I feel sure that Perkins can give you a pretty good idea of a not to exceed temperature for exhaust gas. Additionally if the engine is under the cockpit
, a mechanical pyrometer ie. one with a capillary tube could possibly be used in lieu of a more expensive electrical
unit because the distance from the sensor to the gauge could be somewhat short. The dial could be mounted somewhere in the cockpit
to be able to keep an eye on when you are pitching the prop and occasionally thereafter when under power. The installation of the actual probe I dont think would be that difficult....after purchasing
the pyro find a machine shop to put the mounting hardware
in the elbow
(or the Perkins recommended position....they might recommend somewhere on the exhaust manifold) insert the probe and tighten the lock bolt down. It should be pretty straight forward.
One thing that you might note is this...and I would want to talk to Perkins about this as well.....I personally would not push the maximum temperature i.e. maximum loading. I would run shy of that somewhat. I also would discuss with Perkins the fact that the mounting point for the pyrometer sensor might be (depending on whether or not they recommend placement) a little remote
from the actual exhaust manifold. Where this goes of course is that the exhaust gas may cool somewhat in passing through an uninsulated exhaust manifold and loose heat in the act of part of it being absorbed by the manifold. Actually this all sounds a lot more complex than it actually is.... were she mine I would have a pyrometer in conjunction with using the temp guage on the engine and I think you should be pretty safe.
There are probably some folks here on the forum who are a lot more knowledgeable than am I with this. I remember in some of the tugs I worked in that on the main engines each cylinder had a pyrometer. Additionally as I recall there was one at master control as well that whatever engineer
that was currently on watch would monitor
along with the myriad of other stuff that needed checking in a vessel of that size and complexity.....
Hope this helps. On the other hand I would watch the water
temp closely and the exhaust as well and not necessarily let it stop me from sailing. Carefully. Thats the method I used in my ketch, in the river trip and afterwards until I sold her and never a problem with the engine or drive train. I woud err if it were though on the side of a pyro provided it was not terribly expensive.
Additionally I just spied Nick in Jedi's post and Im in accord with him.
As an afterthought- I have close voyaging friends who migrated to Australia
. They know quite a bit of the history of yachting and sailing in the UK. If you have problems with this I would be happy to e mail them for suggestions on how to run down the origins of your ship and her equipment