Tores mailbox VIIC and VIIC/41 operation and technical details

[NZSnowman]

Tore, here a sneak preview. Still have lots of detail to add.

[tore]

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

[NZSnowman]

Tore, this is as far as I can go with the photo's I have. From this point it all estimated

[tore]

Simon.
Unfortunately you are right, I guess however that the next exhaustmanifold section passing the Roots blower is pretty certain. I have an idea for the inlet and output of the Roots blower, but rigth now it would be guesswork so I keep looking for documents confirming next step.
Tore

[NZSnowman]

Tore, Check this out

I overlay the Pressure Hull openings on the Engine Room layers. It great to see the openings matching

[NZSnowman]

Tore.

Q1. What is this (Purple)?

Q2. Why is the extra pipe on the Starborad side (Green)?

[tore]

Tore, Check this out

I overlay the Pressure Hull openings on the Engine Room layers. It great to see the openings matching

Simon
Looks fine,I guess you can fit the last section of the exhaustmanifold as well, ready for hooking up the exhaustpipe.
Tore

[tore]

Simon
The purple marked item s are the two pneumatic motors turning the grinding device for the main exhaustvalves.
The green marked pipe could be the anticorrosion oil connection to the Junker compressor however there are valves which does not fit in. I`ll have to check and revert tomorrow.
Tore

[tore]

Simon
It was rather late yesterday trying to answer your question so I better try to rectify now. The green marked pipe system is far to large for being the anti corrosion oil pipe, I guess it is more likely belonging to the ventilation suctionsystem having a crossover to the port side and a branch to the lower stb outboard side connecting to the oxygen flask. You `ll find a better picture at the U historia seeing the connection to stb.
Tore

[tore]

Simon.
Roots blower.
The Roots blower is indeed placed a bit off the centerline of the engine as can be seen on the sketch below. The off center is towards outboard and make an improvement for the airinlet as well as facilitates the connection to the airmanifold.
Tore

[NZSnowman]

Simon
The purple marked item s are the two pneumatic motors turning the grinding device for the main exhaustvalves.
Tore

Tore, for some reason I had always thought grinding device was hand operated.
 
Looking at the photo

[NZSnowman]

Simon.
Roots blower.
The Roots blower is indeed placed a bit off the centerline of the engine as can be seen on the sketch below. The off center is towards outboard and make an improvement for the airinlet as well as facilitates the connection to the airmanifold.
Tore

Thanks Tore, will update my drawing today.

[tore]

Simon.
On the British report of U 570. You can read an accurate description of the exhaust valvegrinding. The muffler valves are turned by the pneumatic motors, the group exhaustvalves are handoperated and the same is the Junker compressor exhaustvalve.

Tore

[NZSnowman]

Simon.
Roots blower.
The Roots blower is indeed placed a bit off the centerline of the engine as can be seen on the sketch below. The off center is towards outboard and make an improvement for the airinlet as well as facilitates the connection to the airmanifold.
Tore

Thanks Tore, will update my drawing today.

[NZSnowman]

Simon.
On the British report of U 570. You can read an accurate description of the exhaust valvegrinding. The muffler valves are turned by the pneumatic motors, the group exhaustvalves are handoperated and the same is the Junker compressor exhaustvalve.

Tore

Tore, while searching the net for information on the exhaust valve grinding I found this. It talks about British Oberon-class submarine exhaust valve grinder

http://www.hnsa.org/doc/oberon/induction/index.htm