Engine Hydrolocking, Airspace

BrendaEM · 02-21-23, 08:36 PM

I wrote the engine museum, again, to ask if the piston could be removed from--without removing the head. And/or how they changed a piston at sea.

They were nice enough to help me before.

Google translate:

Firstly, thank you for explaining how large the piston is. : )
I am not an official part of "Wolfpack" game, but because I was curious, I modeled/shaped in 3D, a U-Boat piston.
https://www.subsim.com/radioroom/sho...09#post2854409

It has been stated that the piston and or connecting rod could be changed at sea.
Could the piston be removed from the access openings or did the cylinder head have to be removed?

Any information would be welcome,
BrendaEM

~

Google Übersetzung:

Zunächst einmal vielen Dank für die Erklärung, wie groß der Kolben ist.

Ich bin kein offizieller Teil des "Wolfpack"-Spiels/simulation, aber weil ich neugierig war, habe ich in 3D einen U-Boot-Kolben modelliert/geformt.

https://www.subsim.com/radioroom/sho...09#post2854409

Es wurde festgestellt, dass der Kolben und/oder die Pleuelstange auf See gewechselt werden könnten. Konnte der Kolben aus den Zugangsöffnungen entfernt werden oder musste der Zylinderkopf entfernt werden?

Jede Information wäre willkommen,

Vielen Dank,
BrendaEM

BrendaEM · 02-23-23, 02:59 PM

I received a reply:
"Wenn bei einem Motor ein Kolben gezogen werden muss dann geht das nur nach oben heraus. Dazu muss der Zylinderkopf abgebaut werden. Die Montageklappen an der Seite der Kurbelwanne sind dazu da die Pleulstangen von der Kurbelwelle zu lösen ohne die Ölwanne abzubauen."

Google Translate:
"If a piston has to be pulled in an engine, it can only be pulled out upwards. To do this, the cylinder head must be removed. The assembly flaps on the side of the crankcase are used to detach the connecting rods from the crankshaft without removing the oil pan."

So, it's not as easy as I hoped, but still the whole crankshaft and oil sump/pan doesn't have to be removed, which in other engines, would usually require removing the entire engine.

That was nice of them to reply.

Kralizec · 02-24-23, 01:57 AM

Don't see how there would be mist in the engine room. Any water would end up in the bilge before getting anywhere near the intake: the vent was on the opposite side of the diesel engine room. Vent on the forward, engine intake by the supercharger at the aft part.

The exhaust is a different matter. When the engine was stopped the exhaust could leak seawater which could flood the manifold up to the exhaust valves. You would need to deal with that by manually cranking the engine with the indicator cocks open.

BrendaEM · 02-25-23, 11:35 PM

I am looking at blueprints. I see air induction, but am unsure where it leads, from the plans I see.

If a pressure-hull exhaust outlet valve open while diving, there more than likely would be at least one engine valve open in the engine open at any given time, to let water in the cylinder.

What's worse: at depth, because the ocean pressure is on the outside of the valve, water entering the exhaust might have enough pressure to open engine valves.
https://bluerobotics.com/learn/press...th-calculator/

That stated, salt water entering an engine is bad.

02-21-23, 08:36 PM	#1
BrendaEM Bosun Join Date: Aug 2022 Posts: 62 Downloads: 0 Uploads: 0	I wrote the engine museum, again, to ask if the piston could be removed from--without removing the head. And/or how they changed a piston at sea. They were nice enough to help me before. Google translate: Firstly, thank you for explaining how large the piston is. : ) I am not an official part of "Wolfpack" game, but because I was curious, I modeled/shaped in 3D, a U-Boat piston. https://www.subsim.com/radioroom/sho...09#post2854409 It has been stated that the piston and or connecting rod could be changed at sea. Could the piston be removed from the access openings or did the cylinder head have to be removed? Any information would be welcome, BrendaEM ~ Google Übersetzung: Zunächst einmal vielen Dank für die Erklärung, wie groß der Kolben ist. Ich bin kein offizieller Teil des "Wolfpack"-Spiels/simulation, aber weil ich neugierig war, habe ich in 3D einen U-Boot-Kolben modelliert/geformt. https://www.subsim.com/radioroom/sho...09#post2854409 Es wurde festgestellt, dass der Kolben und/oder die Pleuelstange auf See gewechselt werden könnten. Konnte der Kolben aus den Zugangsöffnungen entfernt werden oder musste der Zylinderkopf entfernt werden? Jede Information wäre willkommen, Vielen Dank, BrendaEM Last edited by BrendaEM; 02-21-23 at 08:57 PM.

02-24-23, 01:57 AM	#3
Kralizec Watch Join Date: Sep 2007 Posts: 18 Downloads: 23 Uploads: 0	Don't see how there would be mist in the engine room. Any water would end up in the bilge before getting anywhere near the intake: the vent was on the opposite side of the diesel engine room. Vent on the forward, engine intake by the supercharger at the aft part. The exhaust is a different matter. When the engine was stopped the exhaust could leak seawater which could flood the manifold up to the exhaust valves. You would need to deal with that by manually cranking the engine with the indicator cocks open. Last edited by Kralizec; 02-24-23 at 02:34 AM.

02-23-23, 02:59 PM	#2
BrendaEM Bosun Join Date: Aug 2022 Posts: 62 Downloads: 0 Uploads: 0	I received a reply: "Wenn bei einem Motor ein Kolben gezogen werden muss dann geht das nur nach oben heraus. Dazu muss der Zylinderkopf abgebaut werden. Die Montageklappen an der Seite der Kurbelwanne sind dazu da die Pleulstangen von der Kurbelwelle zu lösen ohne die Ölwanne abzubauen." Google Translate: "If a piston has to be pulled in an engine, it can only be pulled out upwards. To do this, the cylinder head must be removed. The assembly flaps on the side of the crankcase are used to detach the connecting rods from the crankshaft without removing the oil pan." So, it's not as easy as I hoped, but still the whole crankshaft and oil sump/pan doesn't have to be removed, which in other engines, would usually require removing the entire engine. That was nice of them to reply.

02-25-23, 11:35 PM	#4
BrendaEM Bosun Join Date: Aug 2022 Posts: 62 Downloads: 0 Uploads: 0	I am looking at blueprints. I see air induction, but am unsure where it leads, from the plans I see. If a pressure-hull exhaust outlet valve open while diving, there more than likely would be at least one engine valve open in the engine open at any given time, to let water in the cylinder. What's worse: at depth, because the ocean pressure is on the outside of the valve, water entering the exhaust might have enough pressure to open engine valves. https://bluerobotics.com/learn/press...th-calculator/ That stated, salt water entering an engine is bad.