Unknown Engine dug out from Japanese field

kiha1314 · Dec 15, 2019

MiTasol said:
The part on the left is part of the engine casing, probably off the rear case, that includes the drive shaft for the part on the right. The part on the right appears to be a small hydraulic pump or similar. Maybe water/meth pump? Or a gun synchronizer?

The fabric substance is probably the remains of a gasket.

I would suggest that you look for good clear photos of all the likely engines suggested by Shinpachi and try and locate the part on the engine and come back to the site then. Apart from Shinpachi there are not many people who are highly knowledgeable about Japanese engines but the basics of all engines are similar and all countries followed similar conventions in design so even someone with a good hands on knowledge of US/British/European knowledge of engines will be able to identify most items.

You must remember that an Homare "x" and Homare "y" will have many differences so if the part is not on the "x" it may be on the "y"

The picture below comes from this book and the English translation was graciously provided by Shinpachi.
View attachment 563934

The part in post 35 may be the item arrowed if the engine is a Homare 21. The distinctive domed nut is often used on hydraulic pumps and injection pumps to cover and lock the pressure regulator adjustment
View attachment 563933

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Thank you very much for your information Mr. MiTasol, I will also look more on Homare Type 21.

MiTasol · Dec 15, 2019

Shinpachi said:
Nakajima Mk 1 hydraulic pump

Hydraulic pump first - there is no adjustable pressure regulator visible on that technical drawing. Only a fixed internal one.

Do you have any drawings of the Fuel Injection system Shinpachi?

The only common left right electrical component is the magneto ignition with the third port being the common earth wiring, normally at the switch end. This component has a very light flange with only two screws which suggests it is not part of the magnetos themselves as they must be waterproof against rain travelling at high speed. This could be the back of the cockpit ignition switch or part of a firewall junction box. A photo showing the inside may help in determining what it is.

Below is one type of American booster coil (shower of sparks) similar to the one in several of the posts above.

kiha1314 · Dec 15, 2019

Shinpachi said:
Nakajima Ha-5 engine.
These diagrams show the original condition of the dug out engine if it was Ha-109 which belonged to the Ha-5 family with the same bore/stroke 146/160mm. No idea about small parts.

View attachment 563322 View attachment 563323 View attachment 563324 View attachment 563325 View attachment 563326 View attachment 563327

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Is there any pdf that I can look of Ha-5 engine?

kiha1314 · Dec 15, 2019

MiTasol said:
Hydraulic pump first - there is no adjustable pressure regulator visible on that technical drawing. Only a fixed internal one.
View attachment 564032

Do you have any drawings of the Fuel Injection system Shinpachi?

The only common left right electrical component is the magneto ignition with the third port being the common earth wiring, normally at the switch end. This component has a very light flange with only two screws which suggests it is not part of the magnetos themselves as they must be waterproof against rain travelling at high speed. This could be the back of the cockpit ignition switch or part of a firewall junction box. A photo showing the inside may help in determining what it is.

Below is one type of American booster coil (shower of sparks) similar to the one in several of the posts above.
View attachment 564031

Is this might be from B-29 ?

MiTasol · Dec 15, 2019

kiha1314 said:
＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿

Thank you very much for your information Mr. MiTasol, I will also look more on Homare Type 21.

Given that Shinpachi thinks it is more likely to be a Nakajima Ha-5 or derivative photos of those would also help, again remembering that the derivatives will have significant differences.

There are a number of Japanese aircraft manuals on the forum at Manual Index - Japan and most have excellent technical drawings which occasionally show engine details.

There are no Japanese engine manuals that I know of though

This schematic diagram from the Ki-43 manual shows the ignition switch and wiring

MiTasol · Dec 15, 2019

kiha1314 said:
Is this might be from B-29 ?

I am fairly confident the one you photographed has enough variations to be from a Japanese aircraft though these may be just a result of damage. I am not sure if the B-29 had an ignition boost coil - they tended to be used more with inertia starters and lower powered starters on big engines. I do not have a B-29 parst manual to be positive on what it was fitted with.

MiTasol · Dec 15, 2019

Try this web site because many of the aircraft manuals come from this site which is very difficult for non Japanese writers to search. They almost certainly have engine manuals as well so if you find any (or airframe or component manuals that are not on the ww2aircraft Japanese manuals page) please post copies here. We all come to learn and to help each other so I am not the only person who will appreciate them. As the hydraulic pump that Shinpachi posted shows some of the manuals do have material that may be relevant.

Some, if not all, of the manuals are from microfilm copies and some are printed as negatives so are hard to read but can be reversed which I find makes them easier to read

MiTasol · Dec 15, 2019

Checked B-29 wiring diagrams and yes they have a booster coil system but I have no way of knowing if it is the type shown above or the type below without a parts catalogue. I woudl strongly suspect the one shown below as that did not require an earth wire (there is none shown in the wiring diagram) and was almost universal on later aircraft.

Shinpachi · Dec 15, 2019

kiha1314 said:
_________________________

Is there any pdf that I can look of Ha-5 engine?

Nakajima Ha-5 engine is also known as Type 97 850hp engine.
Manual is available here -
Manual with drawings for Type 97, 850 hp. engine, May 1938. Report No. 15n(22), USSBS Index Section 2 - 国立国会図書館デジタルコレクション

MiTasol · Dec 18, 2019

Japanese engine technical data contains manuals on other Japanese engines of the period

kiha1314 · Oct 18, 2020

Finally, What is this engine?
Sakae or Kinsei

Also these parts too

kiha1314 · Oct 18, 2020

continue

Unknown Engine dug out from Japanese field

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