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Anyone had an 8-speed gearbox flush ?
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euangibson
 


Member Since: 24 Dec 2010
Location: Borders
Posts: 11027

Scotland 2012 Discovery 4 3.0 SDV6 HSE Auto Firenze RedDiscovery 4

Rob,do you have "issues" or is this purely timely and preventative maintenance ?
 "Better to remain silent and be thought a fool,than to speak out and remove all doubt" ?.....what rubbish...

Locking rear E-diff
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D4 Firenze my2012 HSE
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Post #142496012th Feb 2015 7:01 pm
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geoff.
 


Member Since: 24 Jan 2010
Location: West kent
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England 

Rolling with laughter Thumbs Up

tell me about the cold Sad

right who,s got an 8 speed near me who would allow me to have a look Whistle
  
Post #142496212th Feb 2015 7:01 pm
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Robbie
 


Member Since: 05 Feb 2006
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United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4



Joy of joys.

I especially like the optimistic JLR icon of an oil filler jug being used - yeah right!

As for the megaflush option on the ZF8, from my exploration so far, I just cannot see a way of hooking-up a dialysis machine. I've not given-up completely but it does not look easy.

Neutral
 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

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Post #142496312th Feb 2015 7:01 pm
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Fitzy73
 


Member Since: 09 Feb 2014
Location: Truro
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United Kingdom 2010 Discovery 4 3.0 TDV6 XS Auto Causeway GreyDiscovery 4

I had been thinking about getting my 6 speed flushed anyway, but now even more so following all of this recent talk about gearbox flushing and mine is just about to reach 75000 so it is already overdue.
 Andy

 
 
Post #142497912th Feb 2015 7:16 pm
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geoff.
 


Member Since: 24 Jan 2010
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good time to do it Thumbs Up
  
Post #142499412th Feb 2015 7:21 pm
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GLYNNE
 


Member Since: 06 Oct 2006
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geoff. wrote:
Rolling with laughter Thumbs Up

tell me about the cold Sad

right who,s got an 8 speed near me who would allow me to have a look Whistle


Thumbs Up Thumbs Up
  
Post #142499612th Feb 2015 7:22 pm
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euangibson
 


Member Since: 24 Dec 2010
Location: Borders
Posts: 11027

Scotland 2012 Discovery 4 3.0 SDV6 HSE Auto Firenze RedDiscovery 4

Disco_Mikey wrote:
euangibson wrote:
Shocked


So, when shall I book you in Whistle

Guinea Pig rates....and waivers signed I assume Whistle ?
 "Better to remain silent and be thought a fool,than to speak out and remove all doubt" ?.....what rubbish...

Locking rear E-diff
RLD spare wheel protector & sump guard
Extended roof rails
Series 111 mudflaps
Black side tubes,grill and vents
Timed climate remote
Hids4u interior lights

D4 Firenze my2012 HSE
D3 Java 2005 SE manual (sold,sadly,thanks for the memories)
1966 '88 Series 2a....still starts in the morning better than I do... 
 
Post #142500912th Feb 2015 7:36 pm
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Robbie
 


Member Since: 05 Feb 2006
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United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

euangibson wrote:
Rob,do you have "issues" or is this purely timely and preventative maintenance ?


Gearbox is as smooth as they come. My intent is to do a single flush, go another 20-30k then single flush again. This way when I hit 60k+ I will have had a slow double-flush, with oil never left for more than 30k without being refreshed, plus not wasting oil. Hopefully ZF8 fluid will become a bit cheaper by the 2nd flush too.

If I could be assured of a ZF8 megaflush I would probably leave it to 50 to 60k, but as said previously there is no easy way to get the dialysis machine plumbed into the ZF8. It probably would require disconnecting the oil lines at the gearbox itself.

Change early, change often.

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 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

Diagnostics for:
Defender, FL2, D3, D4, Evoque, RRS & FFRR
A not-for-profit enterprise


 
 
Post #142501812th Feb 2015 7:50 pm
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euangibson
 


Member Since: 24 Dec 2010
Location: Borders
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Scotland 2012 Discovery 4 3.0 SDV6 HSE Auto Firenze RedDiscovery 4

Understood Thumbs Up
 "Better to remain silent and be thought a fool,than to speak out and remove all doubt" ?.....what rubbish...

Locking rear E-diff
RLD spare wheel protector & sump guard
Extended roof rails
Series 111 mudflaps
Black side tubes,grill and vents
Timed climate remote
Hids4u interior lights

D4 Firenze my2012 HSE
D3 Java 2005 SE manual (sold,sadly,thanks for the memories)
1966 '88 Series 2a....still starts in the morning better than I do... 
 
Post #142502112th Feb 2015 7:52 pm
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wormus
 


Member Since: 01 Mar 2009
Location: Bedfordshire
Posts: 146

United Kingdom 2012 Discovery 4 3.0 SDV6 HSE Auto Orkney GreyDiscovery 4

I have a MY12 8sp still under warranty and considering a flush. Car has done 52k miles, Geoff - can you do this?
  
Post #14710959th May 2015 6:30 pm
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geoff.
 


Member Since: 24 Jan 2010
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England 

unfortunately not due to the thermostatic valve on the side of the 8 speed box that Robbie found out about , doesn't open till approx 73c i think thats right, maybe robbie will be along soon and explain a bit better Thumbs Up
  
Post #14711019th May 2015 6:38 pm
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Dave T
 


Member Since: 03 Jul 2009
Location: Glasgow
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England 

So Robbie, are you saying just drain and refill every 30k or so? It trust you are doing a how to? Whistle Whistle Whistle

Is there a filter to change?

How much is a gearbox worth of oil?
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Post #14711299th May 2015 7:33 pm
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Disco_Mikey
 


Member Since: 29 May 2007
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Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

Personally, after 45k, I'd be doing a drain and refill every service, if it were my own gearbox...
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Post #14711459th May 2015 8:01 pm
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Robbie
 


Member Since: 05 Feb 2006
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United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

As described by Geoff, the problem child in the D4 ZF8 arrangement is the thermostatic valve that prevents anything but hot oil from circulating through the oil cooler:

Click image to enlarge


Quote:
Quote:
DESCRIPTION
The transmission fluid cooler is a separate cooling unit located behind the engine cooling radiator. The unit is attached, via a bracket, to the cooling pack protection subframe. The transmission is connected to the fluid cooler via flexible hoses and metal pipes.

The transmission fluid cooler is a dedicated cooler which is connected into the engine cooling system circuit. The transmission fluid is cooled by the temperature differential between the transmission fluid and the engine coolant flowing through the cooler.

Fluid is supplied from the transmission fluid pump, through the thermostatic valve (if open) into the cooler. After passing through the cooler, the fluid passes out of the cooler and is returned to the transmission fluid pan.

The thermostatic valve is located in the transmission cooler fluid supply and return lines. The valve contains a bi-metallic spring and valve which is closed when the transmission fluid temperature is below 69 oC (156.2 oF). At a temperature of 69 oC (156.2 oF) and above, the valve begins to open allowing the fluid to flow around the cooler. The valve is fully open at 79 oC (174.2 oF) .


We've yet to find away of bypassing the valve to allow for the full dialysis method of flushing the gearbox with lovely fresh oil.

Mike's suggestion of a simple drain and fill every service after 45k is not a bad one at all.

Thumbs Up
 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

Diagnostics for:
Defender, FL2, D3, D4, Evoque, RRS & FFRR
A not-for-profit enterprise


 
 
Post #14711609th May 2015 8:29 pm
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Robbie
 


Member Since: 05 Feb 2006
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Posts: 17932

United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

Dave T wrote:
So Robbie, are you saying just drain and refill every 30k or so? It trust you are doing a how to? Whistle Whistle Whistle

Is there a filter to change?


There is a filter but I will probably leave it alone. I could do I how to but compared to Geoff & Mike I am an amateur with the oily stuff. I'm hoping to do this soon, with Geoff's guidance no doubt.

Thumbs Up
 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

Diagnostics for:
Defender, FL2, D3, D4, Evoque, RRS & FFRR
A not-for-profit enterprise


 
 
Post #14711649th May 2015 8:33 pm
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