Unknown Engine dug out from Japanese field

Shinpachi · Dec 7, 2019

I recommend you to measure the bore x stroke.

Ha-25/115 130mm x 150mm
Ha-109 146mm x 160mm

kiha1314 · Dec 8, 2019

Partly the fragments were recognized as Ki-44's parts

kiha1314 · Dec 8, 2019

Moreover, I would like to know what the others are (I will send more images later on)

kiha1314 · Dec 8, 2019

This is the latest photo of engine dug out.

kiha1314 · Dec 8, 2019

These metal fragments are still unknown, I would like to know where these came from. (1)

kiha1314 · Dec 8, 2019

These metal fragments are still unknown, I would like to know where these came from. (2)

kiha1314 · Dec 8, 2019

These metal fragments are still unknown, I would like to know where these came from. (3)

Shinpachi · Dec 8, 2019

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.

Wurger · Dec 8, 2019

As I had mentioned that these are the engine valves also seen in the two last diagrams posted above. Judging by the shape of the bottom surfaces of the front round heads, one of them is the exhaust valve while the second valve is the suction one.

Shinpachi · Dec 8, 2019

Good point, Wojtek.
Nakajima radial engines were strongly influenced by P&W.

How to check stroke.

Wurger · Dec 8, 2019

PWR4360-59B · Dec 8, 2019

So you are saying with the master rod included there are 7 rods per throw? I knew for sure that it was not from a 3350, wrong style of rods.
I was guessing it was an R-1830 but its just a guess, I'd have to study a bit more. Parts of a Japanese engine could look very similar to American ones
I'm sure they copied them alot. Looks like Shinpachi has it figured out.

MiTasol · Dec 14, 2019

kiha1314 said:
These metal fragments are still unknown, I would like to know where these came from. (2)

1 2 (1) and 1 2 (3) is a vibrator ignition coil used to provide a "shower of sparks" during engine start. It is powered off the starter circuit

These two are small pumps - could be de-icer or similar, as they look too small for fuel or hyraulic pumps

MiTasol · Dec 14, 2019

Beautiful drawings Shinpachi. I wish I had your talent.

kiha1314 · Dec 14, 2019

Thank you very much for everyone's effort to seek out what engine is this is.
Again I would like to what these parts belongs to;

kiha1314 · Dec 14, 2019

Moreover, these parts connect each others (There was some fabric substances on 2(1))

MiTasol · Dec 14, 2019

kiha1314 said:
Moreover, these parts connect each others (There was some fabric substances on 2(1))

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.

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

MiTasol · Dec 14, 2019

This one appears to be a transmitter that drives a cockpit instrument. There appears to be writing on it - check the other two connections as well and please provide translations.

Shinpachi · Dec 14, 2019

Nakajima Mk 1 hydraulic pump

Source: Type 100 heavy bomber (Ki-49 Helen) manual
Manual for operating Type 100, heavy bomber with drawings by Army Air headquarters, August 1941. Report No. 15n(10), USSBS Index Section 2 - 国立国会図書館デジタルコレクション

kiha1314 · Dec 15, 2019

Shinpachi said:
View attachment 564003

Nakajima Mk 1 hydraulic pump
View attachment 564004
Source: Type 100 heavy bomber (Ki-49 Helen) manual
Manual for operating Type 100, heavy bomber with drawings by Army Air headquarters, August 1941. Report No. 15n(10), USSBS Index Section 2 - 国立国会図書館デジタルコレクション

＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿

Thank you very much Mr. Shinpachi, I will be very much appreciate with those infos.
Is there any link for book which includes about Nakajima's engine I can look of?

Unknown Engine dug out from Japanese field

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