M44 / M43 Disa Valve Repair

Stevo7682

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maybole
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Z3 Individual dakar
So a couple of weeks ago my Dakar was a bit flat at lower revs plugged in the c110+ showing a disa valve activation fault.
After a bit of hunting around I came across this video showing Disa overhaul
View: https://youtu.be/5F6GTrF9hR0


What I discovered was it seems that the motor side of things is a sealed unit so as long as working it's good to go and all that really gets changed is the diaphragms so I thought I could do that.
M44 disa
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MM43 Disa
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Disa valve is the same on both engine bar the bolts ( which are different and not interchangeable) so bar the extra nut for dipstick removal is pretty much the same
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I had a spare from Lynne's replacement engine do fitted that but rattling a bit.
Once removed I dismantled the faulty one and found that the upper diaphragm badly damaged.
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After a bit of looking around I discovered the lower diaphragm relatively easy to aquire the upper seal less easily to obtain found a guy on ebay who did them but only in kit of 3 so as disa easily removed decided to remove them both to look at the condition of them
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When you look through the hole the rod comes out of i could see the damage to the diaphragms .
So bought the kit of 3 seals
Upon inspection of the other 2 discovered both had play at the flap.
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After reassembled greased the pin on the flap and greased the hinges on the flap have to say play in valve is much improved .

I would have to reckon based on the 3 I have seen the upper seal fail seems to be fairly common issue.

This is a link to the upper diaphragm set I bought
https://www.ebay.com/itm/164145839176
 

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renaars

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May 27, 2022
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Can the valve rattle cuz i think mine is ratteling
and the you cant just switch the valve frome m43 to m44 ?
 

Stevo7682

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Can the valve rattle cuz i think mine is ratteling
and the you cant just switch the valve frome m43 to m44 ?
Yes can rattle quite badly.
M43 and m44 disa are the same bar the type of mount bolt if you look at the pictures at the start of the thread you will see the difference.
Stephen.
 

colb

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Newport, South Wales,UK
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Z3 M43 1.8 (1999) and Z4 E85 2.5 (2003)
ebay link not working
 

AntStark

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It is working they have just sold out
 
Last edited:

Stevo7682

Zorg Expert (I)
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maybole
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Z3 Individual dakar
The red smaller front diaphragm is hard to come by yet seem to be the common one to disintegrate I had to buy 3 the last time they are around £11 each
New disa expensive as long as motor works rest can be overhauled
Stephen.
 
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