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K750 ressurection

kmz k750 SV russian boxer side valve

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#1 luca.stere

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Posted 04 December 2016 - 02:12 AM

My dear comrades,

For the victory of the socialism and for the greater good of the working class :laugh:  I have begun to work at the new project: KMZ K750 first model with the short frame.



I have buyed this bike as parts, ones I had the frame, after that the sidecar, the engine, I have found a fork and a gearbox, I had the luck to find at a very good price two new Dnepr complete wheels and I am still buying... The bike has no document but I estimate the production year of the frame is from the '50s.

I have started as always with the engine, I have picked a good engine housing with no cracks or threads problems:

Attached File  carter-kmz-k750.jpg   281.15K   17 downloads

Attached File  carter-kmz-k750-2.jpg   250.39K   25 downloads

Attached File  carter-kmz-k750-3.jpg   260.59K   12 downloads

#2 luca.stere

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Posted 05 December 2016 - 02:39 PM

I have cleaned the engine housing:

Attached File  20161120_124757.jpg   255.15K   14 downloads

Attached File  20161120_124804.jpg   205.98K   24 downloads

And after that I have sand blasted the parts:

Attached File  20161120_134258.jpg   221.74K   29 downloads

Attached File  20161120_153540.jpg   178.6K   22 downloads

#3 luca.stere

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Posted 05 December 2016 - 02:41 PM

Problems with uploading pics...

Attached File  carter-K750-sablat 1.jpg   210.58K   10 downloads

Attached File  capac-distributie-K750-sablat 1.jpg   221.59K   10 downloads

#4 Vance Blosser

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Posted 05 December 2016 - 07:06 PM

Looks good!

#5 luca.stere

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Posted 08 December 2016 - 12:27 PM

I have a rebuilt crankshaft with new rollers, pins and 22mm bronze bush for piston rod in order to use with auto BMW pistons and Goetze rings:

Attached File  ambielaj-k750.jpg   162.87K   11 downloads

Attached File  ambielaj-k750-2.jpg   184K   12 downloads

Attached File  ambielaj-k750-3.jpg   198.17K   9 downloads

Attached File  bucsa-bolt-biela-22mm-k750.jpg   162.12K   11 downloads

Attached File  biela-kmz-k750.jpg   197.39K   7 downloads

#6 rbike

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Posted 31 December 2016 - 04:14 PM

What exactly pistons you used? Why not original rings?
Ural Gear Up
Volvo BV202
M72N
CJ750
Mt11
K750M

#7 luca.stere

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Posted 01 January 2017 - 03:36 PM

View Postrbike, on 31 December 2016 - 04:14 PM, said:

What exactly pistons you used? Why not original rings?

There are some BMW 320 pistons which will be machined in the top in order to reduce the compression height (not ratio). These are used pistons but in a good shape and I have the advantage of being very stable in warm conditions because these already have thousand of cycle already made. I have used this method at the the rebuilding of he's engine and it worked just fine.

In the meantime I have discovered other pistons (VW Golf Mk1 1600cc engine) wich are suitable for this engine and used them at other engines rebuilds: http://motorist.ro/v....php?f=30&t=343

Original pistons... it is hard to find realy original parts (NOS parts) and when you find they are expensive. Also they don't have the quality of modern pistons and rings.

#8 luca.stere

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Posted 05 March 2017 - 12:39 PM

So, I have been working but did not have the time to post the evolution of my work. I have cleaned up the oil slingers which always ar full of dirt:

Attached File  tavi-centrifugare-colmatate-k750.jpg   226.24K   3 downloads

The removed dirt:

Attached File  rsz_mizerie-tavi-centrifugare-k750.jpg   218.38K   5 downloads

For an easy cleaning you have to heat them up well with a torch, if you try washing the slingers will not help. It is very important to have good and cleaned oil slinger. After the cleaning are like new:

Attached File  tavi-centrifugare-curatate-k750.jpg   211.85K   5 downloads

Attached File  tavi-centrifugare-curatate-2-k750.jpg   221.37K   4 downloads

#9 luca.stere

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Posted 05 March 2017 - 12:58 PM

Some new parts that I have buyed from Ural-Zentrale.

New camshaft:

Attached File  ax-came-k750.jpg   221.07K   8 downloads

Attached File  ax-came-k750-2.jpg   158.74K   9 downloads

I did not have two springs vor valves:



New SKF bearings for crank and camshaft:

Attached File  rulmenti-skf.jpg   41.42K   8 downloads

Attached Files



#10 luca.stere

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Posted 05 March 2017 - 01:55 PM

The crank with the mounted slingers:

Attached File  Loctite-suruburi-tavi-centrifugare-k750.jpg   190.09K   7 downloads

Attached File  tavi-centrifugrare-montate-k750.jpg   191.01K   9 downloads

Attached File  tavi-centrifugare-montate-k750-2.jpg   210.99K   7 downloads

Assembling the crankshaft bearing housing:

Attached File  palier-rulmenti-montare-k750.jpg   193.71K   8 downloads

I have used the bolts for pressing directly in the right position, heating a little the engine housing it helps.

Attached File  palier-rulmenti-montat-k750.jpg   166.81K   8 downloads

#11 luca.stere

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Posted 05 March 2017 - 02:13 PM

This bolt is good for cleaning the oil chanel, it helps to eliminate the dirt when you clean the engine with solvents:

Attached File  Loctite-dop-rampa-ulei-k750.jpg   126.76K   8 downloads

Attached File  dop-rampa-ulei-montat-k750.jpg   129.47K   9 downloads

Assembling the front bearing housing:

Attached File  palier-rulmenti-montare-k750.jpg   193.71K   8 downloads

The bolt are for pressing directly to right position, heating the engine housing it helps.

Attached File  palier-rulmenti-montat-k750.jpg   166.81K   6 downloads

The front bearing:

Attached File  rulment-6207-c3-SKF-montat-K750.jpg   218.41K   7 downloads

Rear bearing with the presure protection washer for the oil seal:

Attached File  rulment-ambielaj-spate-montat-k750.jpg   159.77K   6 downloads

#12 luca.stere

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Posted 05 March 2017 - 03:20 PM

New old style felt seal for the rear and the sanded rear housing crank bearing:

Attached File  simering-pasla-k750.jpg   179.03K   6 downloads

Attached File  simering-pasla-montat-k750.jpg   213.05K   7 downloads

Also the speing washer for the rear seal protection:

Attached File  saiba-presare-saiba-simering-k750.jpg   161.43K   6 downloads

This part is pressing the rear washer onto the bearing and protect the rear seal from the pressure generated by the pistons movement inside the engine.

#13 luca.stere

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Posted 05 March 2017 - 03:26 PM

And the assembling of the crankshaft inside the engine housing. For the front bolts I have used Loctite in order to secure them:

Attached File  Loctite-suruburi-palier-k750.jpg   165.81K   3 downloads

Attached File  montare-ambielaj-k750-2.jpg   206.01K   3 downloads

Attached File  palier-rulment-fata-montat-k750.jpg   202.28K   5 downloads

And the rear, I have used Elring to seal the part:

Attached File  Elring.jpg   141.17K   6 downloads

Attached File  palier-spate-montat-k750.jpg   211.5K   6 downloads

#14 luca.stere

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Posted 18 March 2017 - 12:33 PM

The new camshaft was covered with grease for rust protection, so I have cleaned up the camshaft:

Attached File  ax-came-K750-Ural-M72.jpg   60.21K   3 downloads

Attached File  ax-came-K750-Ural-M72-2.jpg   66.34K   4 downloads

Attached File  ax-came-K750-Ural-M72-3.jpg   62.55K   5 downloads

New SKF bearing 6205 C3:

Attached File  rulment-pinion-ax-came-k750.jpg   104.06K   5 downloads

New timing gears:

Attached File  pinioane-distributie-noi-k750.jpg   273.88K   5 downloads

#15 luca.stere

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Posted 18 March 2017 - 12:38 PM

I have heated the timing gears for a smooth assembling, not pressed or hammered, you can obtain like this a better fixation:

Attached File  pinion-ax-came-montat-k750.jpg   115.12K   4 downloads

Attached File  pinion-arbore-k750.jpg   78.32K   5 downloads

Attached File  pinion-arbore-incalzire-k750.jpg   56.45K   5 downloads

Attached File  pinion-arbore-montat-k750.jpg   120.17K   7 downloads

Loctite for the bolt from the cranckshaft timing gear:

Attached File  surub-pinion-arbore-k750.jpg   77.74K   6 downloads





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