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Kubota diesel KND3

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Kubota diesel KND3

Post by Mark15 user on Sun Aug 07 2016, 14:27

Dear forum members,

I've bought a new motor recently.
It's a single cilinder Kubota KND3 horizontal diesel engine.
Runs like a watch and needs a bit of TLC and a new trolley.
Seems a good project for the coming winter.



Don't know if it was a common engine in UK?

Best regards,

Steef








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Re: Kubota diesel KND3

Post by janner on Sat Sep 03 2016, 21:21

Hi there . I had a KND same as yours , I sold it and wish I never , they are lovely runners, the colour is a bit pants but they run and start superbly , nice find

Jon

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Investigation oil problem

Post by Mark15 user on Sun Oct 09 2016, 10:29

Dear forummembers,

After the show in Tilligte where an oil problem occurred I've rechanged the oil.
When the engine was turned by hand the oil indicator didn't move upwards.
Even with a very short run it seems there was no oil pressure.

Therefore I've decided to strip the engine and have a closer look at the problem.
First action was to remove the flywheel to enter the oilpump.
After a week soaking in WD40 and penetrating oil the first attempt was done to remove the big nut.
I could use a big spanner from a local Mercedes truck dealer.
A few attempts later the nut came off without damage Very Happy


To pull the flywheel off I've made a spanner from an old piece of oak and three threaded rods M10.
I've sprayed penetrating oil in the shaft and key hole for a few days.

Then I did a first attempt. Was a little bit nervous that the tension caused by the threaded rods could crack the flywheel. Rolling Eyes
Luckily the flywheel came off after a little help with a heavy piece of wood cheers

The cover plate of the oilpump was removed. The rotor from the pump didn't turn when I (carefully) cranked the engine.
After removing the oilpump rotor it seems that the shaft which fit in the camshaft is too short.


(Oilpump already removed on the pictures)
See the damage in the central bore; hope this can be repaired Question
Still have to remove the camshaft to check if the remaining part of the shaft is stucked in there.
Therefore the left side (fuelpump cover) has to be dismantled as well.
I hope that the nut in the camshaft is not worn out. Praying for the best. affraid

Keep you updated.

Best regards,

Steef


Last edited by Mark15 user on Sun Oct 09 2016, 18:10; edited 3 times in total (Reason for editing : pictures added)

Mark15 user
A true Stationary engine owner
A true Stationary engine owner

Posts : 106
Join date : 2014-09-06
Age : 46
Location : Holland

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Closer look at the oilpump connection in the camshaft

Post by Mark15 user on Mon Oct 10 2016, 20:33

Dear forum members,

Today I've removed the side cover of the engine to take a closer look at the oilpump connection in the camshaft.
First I had to clean a severe layer of old oil and grease from the bearing and the cover.

In the centre of the camshaft there is a circular shape; seems it's worn out. Sad



Still thinking about the best option to solve the issue.
Don't know if it's possible to weld on a layer of wear resistant material Question Question
Guess the camshaft should be (surface) hardened; risk of cracks Question Question
Didn't see any (second hand) camshaft on internet up till now.

Any suggestions or ideas?
Please let me know.

Best regards,

Steef Pronk


Mark15 user
A true Stationary engine owner
A true Stationary engine owner

Posts : 106
Join date : 2014-09-06
Age : 46
Location : Holland

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Re: Kubota diesel KND3

Post by Woodsman on Tue Oct 11 2016, 07:45

Not a DIY job but metal spraying might be the answer, followed by a trip to a skilled machinist. Might be expensive Sad Sad

_________________
Regards Paul
Tha can alus tell a Yorkshireman - but tha can't tell him much.

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Dismantling and cleaning

Post by Mark15 user on Wed Nov 09 2016, 09:32

Dear forum members,

Been a while since the latest update.
Decided to strip the complete engine and give it a good internal cleaning.
This gives the opportunity to take a closer look at the current state of some critical parts.

A thorough cleaning of the inside was absolutely necessary.
All parts were covered with a thick layer of sticky black sludge.
The usage of brake cleaner and Dasty increased to a high level last weeks Laughing

Luckily there were some marks on the camshaft and crankshaft visible to determine the correct timing.
Got pictures from a partsbook which will help me with the (future) assembly.





Found issues sofar

- bigend bearing worn out (copper surface visible on some spots)
- piston pin bearing worn out ( abot 0,1mm play; guess this was the reason of the ticking sound while slowly crancking the engine)
- oil pump malfunction
- cilinder bushing surface no hohne pattern visible. Ridge on the bottom of the cilinder

Have to measure the crankshaft to determine if regrinding is possible.
Keep you posted

Best regards,

Steef Pronk






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A true Stationary engine owner

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Age : 46
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Re: Kubota diesel KND3

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