Tores mailbox VIIC and VIIC/41 operation and technical details

[NZSnowman]

Added the deck plating today

[tore]

Simon.
Too bad to cover up all the hard work you had with the piping . Just a small detail, if you look at the u historia photo of the reserve luboil/fueltransfer pump forward port
side you`ll see the deckplates don`t have the red marked plate below. I know your lay out is according to some drawings, but the original luboil-and coolingwater pipes does not allow for this plate on poor old U 995. It could of course be one of these deviations previously mentioned.
Tore

[tore]

Simon.
Deckplates.
I checked a photo I had of the plates of u 995 presumeably from 1965- 70 so most probably in the original execution. An accurate position of the deck operated valves are hard to established, but a  view of the diamond shaped pattern is quite clear. Another detail is the step down which seems to be aft of the vibration damper.
Tore

[NZSnowman]

Simon.
Deckplates.
I checked a photo I had of the plates of u 995 presumeably from 1965- 70 so most probably in the original execution. An accurate position of the deck operated valves are hard to established, but a  view of the diamond shaped pattern is quite clear. Another detail is the step down which seems to be aft of the vibration damper.
Tore

Very interesting!
 
Tore, do you think its original German floor plating or original floor plating layout?
 
I had believed the original German floor plating was pattern as I have drawn with a

[tore]

Simon.
I cannot imagine the floorplates were changed in Norway and then changed in Germany once more, I would say it is a pretty good chance the diamond pattern are the original plates.
Tore

[tore]

Simon.
I just checked another photo of the engine room deckplates of U 178 and by treating the photo in photoshop I got the pattern of the plates and they are diamond shaped as well as can be seen on the picture below.
Tore

[NZSnowman]

I just checked my books, and found two pictures of the engine floor plate; One with 

[tore]

Simon.
Just another confirmation of these deviations which we have seen so many of.
Tore

[NZSnowman]

Tore, I can not found any photo's that show the foot of the rocker arm base (yellow). There one bolt at the front but I imagine you would need more than one large bolt to hold this on to the engine.

Tore, can you give me any idea of the shape of the foot and how many bolts are needed?   

[tore]

Simon.
The visible bolt on the exhaust/ inletvalve pedestal is taking the peak of the load but I am sure there must be a bolt on the other side. Normally it should be a bolt of the same size, but this second bolt could from a stress point of view be smaller although that would be unconventional. I`ll keep looking to see if I can find a solution.
Tore

[NZSnowman]

Simon.
The visible bolt on the exhaust/ inletvalve pedestal is taking the peak of the load but I am sure there must be a bolt on the other side. Normally it should be a bolt of the same size, but this second bolt could from a stress point of view be smaller although that would be unconventional. I`ll keep looking to see if I can find a solution.
Tore

Tore, I was thinking of a 3 bolt fixs (green). Do you think it would only be two (green and orange)?

[tore]

Simon.
May be two smaller (green) will do particularly taking the shape of the base plate into account.
Tore

[NZSnowman]

Added the missing locking ring

Old drawing - left; New drawing - right

[NZSnowman]

Simon
We are entering a gray zone for me, I can not remember how the airduct from the Roots blower is entering the airmanifold. It is annoying because I my shelf dismantled the blower entirely ( some 60 years ago) . I have superimposed your drawing on top of a layout drawing  to figure out the arrangement. The confusion is on an appearant large ( yellow coloured ) square opening which I thought would be the inlet to the manifold. I just show you the picture may be you have more materials helping you to figure out the connection.
Tore

Tore, what is your suggest in how I should enter the airduct to in the Roots blower? Should I just extent the pipe across to the blower for now?

[tore]

Simon
Airflow Roots blower.
Below is a drawing where I have suggested the airflow (green) of the Roots blower.  This would mean that you just extend the air manifold  so it matches the blower casing, the airduct shall then be flanged vertically to the Roots airduct. ( my assumption). Yellow duct is inlet duct for the aft cylinder.
Tore