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

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

Post by Mark15 user Sun Apr 19 2015, 16:52

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.
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150423
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150424

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?  

Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150416
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150421

Cleaning of the inside was a time consuming job. Mad
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.
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150417
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150425
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.
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150422

Wish you all a nice sunday evening.

Best regards,

Steef Pronk


Last edited by Mark15 user on Fri Jul 03 2015, 13:25; edited 3 times in total
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Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! Empty Stefa seal finally found an alternative

Post by Mark15 user Fri Apr 24 2015, 14:13

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 Rolling Eyes .
Will let you know when I received the parts.

Best regards,

Steef Pronk


Last edited by Mark15 user on Thu May 21 2015, 20:30; edited 1 time in total
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Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! Empty painting and new sealing

Post by Mark15 user Fri May 15 2015, 17:38

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.
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150510
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150426

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.
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150513
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150525
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150526

The bearings were ordered at a local car parts shop; however these were closed bearings Mad
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 Shocked )
Finally I've found a small local ship suppliershop which is able to deliver 1 liter quantity.

Best regards,

Steef Pronk


Last edited by Mark15 user on Thu May 21 2015, 20:33; edited 3 times in total (Reason for editing : pictures added)
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Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! Empty Assembly components

Post by Mark15 user Thu May 21 2015, 19:12

Dear Forum members,

Today I received the bearings and I've decided to assemble the pump.
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150519
The pumpshaft was polished to remove damages and rust.
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150516
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)
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150517
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. cheers
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150522
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150524

(A before picture)
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150320

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

Post by StewartH Fri May 22 2015, 09:54

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

Post by Woodsman Sun May 24 2015, 16:50

Nice work as usual Steef

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Regards Paul
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Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! Empty Finished pictures 01-06-2015

Post by Mark15 user Mon Jun 01 2015, 18:06

Dear forum members,

After filling up with oil and a final layer of paint the pump is ready. Very Happy
To cover the bolts from paint I've bought plastic caps at Gamma.
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! Cover_10
(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.

Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150516
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150517
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! 20150519

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

Best regards,

Steef Pronk
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Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! Empty Dating the pump (1938 - 1944)

Post by Mark15 user Fri Jul 03 2015, 13:23

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) cheers Never thought that this pump could be that old
Benco vacuumpump overhauling update 03072015 dating the pump. Yes it's very old! Screen10

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
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