Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old!

Dear forum members,

I've decided to overhaul te vacuumpump first before finishing the trolley.
The bearings made some noise and showed some "heavy" points.

Dismantling the pump is not very difficult; however sometimes things are not as expected.
During the dismantling of the front bearing the outer ring broke. This a standard SKF bearing 6204.
The inner ring could be removed without problems.
At the backside of the pump a cover is pressed where the bearing is located.
The position of the plates in the pumprotor is marked with points.



Don't know if this was done by an earlier overhauling or maybe  from factory.
On the pumpshaft a  steel ring (OD 60mm-thickness 2mm)  was mounted. Don't know if this should be normal?  




Cleaning of the inside was a time consuming job.
50 Year of usage has resulted in a thick layer of a mixture of old oil residue and carbon deposit on the inside of the pump.
After a good clean with dasty it looks much better now.


sprayed a slight layer WD40 on the flat surfaces of the pumpcovers and the rotor to protect them against corrosion.
Will look for replacement bearings and a seal next week.


Wish you all a nice sunday evening.

Best regards,

Steef Pronk

Dear forum members,

It took a long search to find an alternative for the Stefa seal.
During my search on internet I came across the company Pro Sealing in the Netherlands.
http://www.prosealing.nl/

They were very helpfull and found an alternative for the Stefa Seal
I´ve purchased 2 seals (one spare). They will be delivered 6th of May so I have to wait a few days .
Will let you know when I received the parts.

Best regards,

Steef Pronk

Dear forum members,

Finally some progress on the vacuumpump.
I've received the sealing rings from Prosealing.
It's different from the Original Stefa Seal; hope it will not colapse due to the vacuüm.



I've decided to paint the pump housing the same color als the Villiers engine.
Sprayed the first layer. After assembly the final layer will be sprayed.




The bearings were ordered at a local car parts shop; however these were closed bearings
So I decided to send them back.

To find an equivalent for the Energol HL80 oil was quite challenging.
Not only the grade; but the minimum order quantity is not suitable for small users.
(one supplier offered me a 200 liter drum )
Finally I've found a small local ship suppliershop which is able to deliver 1 liter quantity.

Best regards,

Steef Pronk

Dear Forum members,

Today I received the bearings and I've decided to assemble the pump.

The pumpshaft was polished to remove damages and rust.

After cleaning the rear bearing was mounted on the shaft.
The shaft was mounted in the back plate
Then the rotor and the front bearing where pressed onto the shaft (rotor including the key)

To ensure a smooth movement of the blades in the rotor 'I've polished carefully the blades.
After that the seal was mounted in the front cover.
See the assembly pictures below. It looks much better now.



(A before picture)


Next step is to spray the outlet cover of the pump.
After completion I wil carefully rub the surface and spray the finish coat.
Visited a local ralley and got some ideas for the trolley.

The trolley project will continue soon in another topic

Best regards,

Steef Pronk

Hello Steef,

A really good thread - great to read and interesting to learn of your methods for finding replacement parts - it looks great - keep the updates coming Sir!

Best wishes for an easy restoration!

Hamish

Nice work as usual Steef

Dear forum members,

After filling up with oil and a final layer of paint the pump is ready.
To cover the bolts from paint I've bought plastic caps at Gamma.

(Cost 1,36GBP per 8 pieces) I guess Wickes should have them too.
I've put grease (vaseline) on the surface of the sealing ring. After painting you can easily wipe of the paint.

See the pictures below.





The valve is still on the pump to avoid entrance of dust.

Best regards,

Steef Pronk

Dear forum members,

I've visited the special collections department of the Wageningen University Library today.
There was more information than expected. Even a partsbook of my C4 pump which showed me roughly the age of my pump.
(1938 - 1944) Never thought that this pump could be that old


In the links chapter you will find the contact data of the special collections department.
http://www.stationaryengineforum.net/t8923-information-source-for-machinery-brochures-netherlands-library-wageningen-university-dpt-special-collections

Best regards,

Steef Pronk