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jdea
Member Since: 02 Mar 2008
Location: Tannum Sands QLD
Posts: 176
  
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I'm sure LR provides a Power Train Cooling Upgrade for Gulf markets where 42 deg temps are the norm. I don’t think they offer it here. You can get after market ones though. The standard cooler integrated into the radiator will not cut it pulling 3.5 tons in 42 deg heat. I dare say the new D4 would be the same
I think a big  oil cool is just another think you need to consider along with a Mitchell Brothers toe bar and a long range tank when you are pulling a van that size up thought the guts.........
If you are interested in what the transmission does when it gets hot:
Cooling Strategy
The purpose of the cooling strategy is to reduce engine and transmission temperatures during high load conditions, when
towing a trailer for example. Under these conditions the engine and transmission may generate excessive heat.
If the transmission fluid temperature increases to 125ºC (257ºF) or higher, the TCM employs the cooling strategy. The
message 'TRANSMISSION OVERHEAT' is displayed in the message center.
The strategy uses a specific shift and torque converter lock-up clutch map. This map allows torque converter clutch lock-up
and gear shifts to operate outside of their normal operation. This will reduce the engine speed and/or slip in the torque
converter, therefore reducing heat generated by the engine and the transmission.
If the transmission fluid temperature increases to 137ºC (278ºF) or higher, the transmission will use the default (limp home
mode). 'H' is displayed in the gear position indicator. If the temperature exceeds 140ºC (284ºF), CAN bus transmission is
disabled and 'E' is displayed in the gear position indicator.
The cooling strategy is cancelled when the transmission fluid temperature decreases to less than 120ºC (248ºF) or below.
Other transmission issues:
Looks like this was a common problem with ZF6HP26 transmission early on
http://www.thelurch.com/lurching_zf_transmission.htm
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 1st Jan 2010 11:57 pm |
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JeffD4
Member Since: 25 Dec 2009
Location: Perth, Western Australia
Posts: 77
 
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Have just checked the specs for the D4 - comes with the ZF HP 28 - haven't seen anyone talking about "lurching" on this one yet. Land Rover Series IIA 1967
Discovery 300 Tdi 1998 (white, ARB bullbar, suspension lift, roof rack, Lightforce spots etc)
Discovery 4 3.0 Litre White, e-diff
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| 2nd Jan 2010 4:35 am |
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caverD3
Member Since: 02 Jul 2006
Location: Oberon, NSW
Posts: 6922
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D3 transmission has the same "lurch" basically nudge when slowing. Solved with a software upgrade. “There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely gamesâ€
Ernest Hemmingway
D4 3.0 Active Diff, Adaptive Lights, High Beam Assist, Surround Cameras, Privacy Glass.
D3 2.7:Adaptive Headlights,Electronic Rear Diff,ARB Bar,Blaupunkt Speakers,JVC Powered Subwoofer,Removable Snorkel,Mitch Hitch,Pioneer After Market Head Unit,Steering Wheel Control Adaptor,Remote Adjustable Supension Rod System, Taxside Dual Battery System.
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| 2nd Jan 2010 5:00 am |
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away
Member Since: 18 Nov 2006
Location: Cossack
Posts: 111
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Thankyou, jdea, for the best explanation yet of what happens when the trans is stressing. Unfortunately I got none of the message centre indications listed, so I am now wondering if perhaps our problem was something else entirely?
Perhaps this is a fuel system issue? Even though the engine itself is not (apparantly) overheating according to the temp gauge, maybe the high-pressure fuel injection system is failing under heat and load? Dunno?
rmp correctly stated that the conditions were extreme and believe me, we were nursing the vehicle along, not exceeding 60KMH for much of the time, particularly later each day as the temp got above 38C, but the hill thing was persistent. It didn't exhibit this problem on just the one hill - it was just the worst example, failing no sooner than pointing the nose upward a bit - it was jerking and losing drive on even small hills, forcing us to slow even more than usual. We've been up and down bigger hills and at higher altitudes on the eastern side of the country without problems and have never had to go into low range to get over a hill.
So, what's left? Barbagallos can't help me and they say that the diagnostic system recorded no faults....now that is strange. I'd ruled out fuel quality, but on reflection I wonder if we got a dud lot at Newman? We didn't have any hills to climb until after filling up there. I don't know enough about the diagnostics to know whether bad fuel would give an alarm indication in the ECU.
Cheers
Russ. D4: Expedition Rack, 104 Litre Long Range Tank, Raised Air Intake
D3: Every bloomin' thing but the kitchen sink
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| 2nd Jan 2010 6:56 am |
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IanR
Member Since: 28 Apr 2007
Location: Daleys Point
Posts: 99
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I have had Davis Performance Landys at Annangrove (Sydney) fit a Transmission cooler after experiencing overheating whilst towing off-road camper through very heavy (and extensive) bulldust. 'S' TDV6, Air suspension, Terrain Response, Active rear diff, Safari Snorkel, Opposite Lock rear wheel carrier, OL drawer system, Cargo Barrier, Dual batteries with Rotronics isolator, GME 3440 UHF. Codan NGT HF, Asus UMPC running TrackRanger. Cooper LT245/70R17 STTs when off-road. Tow Ultimate off-road camper.
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| 2nd Jan 2010 6:57 am |
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Jamo
Member Since: 18 Jan 2006
Location: Esperance, Western Australia
Posts: 1170
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IF they just changed the ATF partially (ie they didn't double flush, then change the pan/filter and then the ATF again) then there may be more issues.
If the HP26 has been used for towing, in high ambient temps or rel high speeds, the ATF needs changing every 80-120,000km (as per ZF's website). If it is left until bad shuddering, stalling or other problems exist; then a single ATF change (where only approx half or less the ATF is actually replaced) then chinks of gunk may be loosened within the tranny casuing even greater problems.
It's an expensive excercise but cheaper than a tranny change.
Hint1: either buy your Lifeguard6 ATF direct from ZF or get BMW ($33 per litre instead of $95 at LR - same fluid!!)
Hint2: search aulro as there is a firm in Melbourne making a replacement tranny pan with a separate filter!
Himt3: be very very sceptical of the fault finding abilities of WA stealers, particularly where warranty work is concerned. Have a nice day!
2010 Cayenne Diesel with PASM & Off Road Pkg
2005 HSE D3 (Sold)
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| 2nd Jan 2010 6:58 am |
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away
Member Since: 18 Nov 2006
Location: Cossack
Posts: 111
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Jamo,
what is used to do the double flush? The same trans fluid? I'm very keen to do this, especially if I can get the trans fluid at BMW prices! What is the process? Could a non-Land Rover workshop do it....so far as I know there are no specialist transmission service centres here at Karratha.
Cheers
Russ D4: Expedition Rack, 104 Litre Long Range Tank, Raised Air Intake
D3: Every bloomin' thing but the kitchen sink
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| 2nd Jan 2010 7:31 am |
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Jamo
Member Since: 18 Jan 2006
Location: Esperance, Western Australia
Posts: 1170
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Hello Russ
The procedure (as advised to me) is:
Confirm transmission oil is below 30 degrees C
Drain & refill transmission
Run engine with gear selector in Park for three minutes at 1750rpm
Stop engine, confirm transmission oil temperature is below 40 degrees C before draining & refilling transmission oil
Confirm oil level as per GTR 44.22.06
Any qualified workshop should be able to do it.
The ATF is ZF Lifeguard6. The HP26 trannny is in BMW's, Jags etc but the cheapest price is a 20 litre drum direct from ZF itself. I wouldn't use anything else especially if warranty is an issue.
The belly plate has to be removed and a tranny mounting bolt I believe as the tranny may need to be elevated. It's in the GTR.
Otherwise PM garryc as he has done it or the guru himself 10forcash! Have a nice day!
2010 Cayenne Diesel with PASM & Off Road Pkg
2005 HSE D3 (Sold)
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| 2nd Jan 2010 7:42 am |
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away
Member Since: 18 Nov 2006
Location: Cossack
Posts: 111
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Thanks Jamo,
I'm onto it. Might have to wait until winter though - it doesn't even cool down to 30C ambient overnight at the moment!
Cheers
Russ D4: Expedition Rack, 104 Litre Long Range Tank, Raised Air Intake
D3: Every bloomin' thing but the kitchen sink
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| 2nd Jan 2010 7:55 am |
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