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Breather Overhall
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Author:  subarupete [ April 14th, 2011, 5:04 pm ]
Post subject:  Breather Overhall
Having seen Russel's recent good work, It spurned me on to fix my breather.

I have made "clamp" to allow the breather parts to be re-connected.

Research on-going for valve material, use rubber in the short term as you will be able to dis-assemble your breather.


If there is any demand I can supply these ...
Bottom has gap to fit over dip stick connection
Top part in two halves
12 off 4mm bolts and nylocs.

Cost including p&p about £20.00


Attachment:
PRC_0140.jpg
Author:  subarupete [ April 14th, 2011, 6:56 pm ]
Post subject:  Re: Breather Overhall
Some "How to..." Pics

Bench Grinder allows some control when grinding
Attachment:
PRC_0002.jpg

Grind round the seam, just enough to be able to prise it apart
Attachment:
PRC_0001.jpg

Clamp Fitted
Attachment:
PRC_0001.jpg
Author:  J-dub [ April 15th, 2011, 1:52 am ]
Post subject:  Re: Breather Overhall
id have one of these for future occasions ;)
Author:  subarupete [ April 19th, 2011, 5:38 pm ]
Post subject:  Re: Breather Overhall
Re-furbished the internals of the breather, will now out-last me and also the car.
Attachment:
breather.jpg

Tested with my new manometer and get 4.5cmm of vacuum at a fast tick-over and 0cm at high-revs
Attachment:
Manometer.jpg
Author:  Devils Advocate [ April 19th, 2011, 9:21 pm ]
Post subject:  Re: Breather Overhall
That's excellent stuff, Pete. What material did you end up using for the rubber diaphragms?
Author:  subarupete [ April 20th, 2011, 10:01 am ]
Post subject:  Re: Breather Overhall
Shim steel, very, very fiddly to cut and make flat...but its works.
Improved vacuum with better starting and an "stable" tick-over.
Will also check the mpg as i believe that also will be improved.
May be make-up some "replacement part" if there is an interest.
Author:  Devils Advocate [ April 20th, 2011, 6:20 pm ]
Post subject:  Re: Breather Overhall
Oooooh, shim steel? That sounds goooooood. Working a bit like the 'reed' valves on 2-strokes engines?
Author:  J-dub [ April 20th, 2011, 11:39 pm ]
Post subject:  Re: Breather Overhall
subarupete wrote:
Shim steel, very, very fiddly to cut and make flat...but its works.
Improved vacuum with better starting and an "stable" tick-over.
Will also check the mpg as i believe that also will be improved.
May be make-up some "replacement part" if there is an interest.


better running etc as to a normal brand new replacement?
Author:  subarupete [ April 21st, 2011, 10:10 am ]
Post subject:  Re: Breather Overhall
@DA
Copied the idea from ECAS CPD valve.

@JW
Vacuum of 4.5cm is good I think......feedback here please.
I dont have a new breather to compare, if you have one to lend I'd be happy to do some tests.
Author:  EirikJ [ April 21st, 2011, 10:32 am ]
Post subject:  Re: Breather Overhall
subarupete wrote:
Vacuum of 4.5cm is good I think......feedback here please.
I dont have a new breather to compare, if you have one to lend I'd be happy to do some tests.


Did you measure it before you did anything to it? I hate to say this, but I'm afraid it's not working optimal, as the vacuum should never fall to zero if stuff is working.

This is what the Citroën manual says:

Quote:
The difference in levels should be:
- With engine idling: Minimum 5cm. The vacuum should never fall to zero, no matter the engine speed. Otherwise the breather must be replaced.


To compare, I think my new one had 7-8cm difference.(maybe I remember wrong)
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