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M47 5 Speed Gearbox .....

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Old Aug 17th, 2018, 22:17   #11
TonyS9
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The 360 uses ATF
240 Haynes recommends Castrol GTX
940 Haynes recommends ATF type F or G in the M46+47
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Old Aug 17th, 2018, 22:37   #12
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Quote:
Originally Posted by bob12 View Post
Question: What is the CORRECT oil for the M47 gearbox? I believe that the only place to get it is from Volvo, but what is it called/designation? I have not see any reliable oil supplier offer a suitable oil in their online specs/catalogue. Bob.
It always used to be engine oil or ATF , you could use either unless you had overdrive .

Below is the later recommendation from volvo using a modern oil .. but yours will be fine with a normal red Dextron III oil .


1 litre 1161645
A multigrade synthetic transmission oil intended for manual
transmissions in passenger cars.
The oil has very good low temperature characteristics and a
lowest flow point of at least -48°C.
The transmission oil is recommended for all model years of
types M45, M46, M47, M90 and M5M42 in S-/V40 with GDI
engine and of type M56, M58 and M59 up to and including
model year 1995.
Technical data
Quality: API GL-4
Volvo Std 1273,08 which
describes transmission oil
97308
Viscosity: SAE 75W
Color: Brown
Density: 885 kg/m³
Base: Synthetic
Lowest flow point -48 °C (104°F)
Viscosity at 40 °C: 67.8 mm² /s
Viscosity at 100 °C: 10.5 mm² /s
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Old Aug 17th, 2018, 22:44   #13
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Quote:
Originally Posted by Clan View Post
a normal red Dextron
Dextron???

GM would be spinning in their epicyclic gear train!

The only "T" that should be anywhere near Dexron should be in your mug while you wait for it to drain!
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Old Aug 18th, 2018, 09:40   #14
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My Haynes manuals quote Duckhams Q-Matic or ATF type F or G for the 240, with an admonition NOT to mix the oil types, and either Volvo Thermo Oil or Duckhams QXR for the 700-series M47 boxes.
As my manual for the 940 has been genetically modifed and walked away I can't quote for the M47/900-series combination.
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Old Aug 18th, 2018, 12:32   #15
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I decided I would have a look on my PC to see what little gems I had stored away!

The first thing I then saw was the Data Pocket Booklet for 700's etc 91/97. That's answered my question. Don't know why I didn't look at it before! All I have to do now is work out what Volvo put in the gearbox: ATM F/G or Synthetic.
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Old Aug 18th, 2018, 12:44   #16
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Alternatively Bob, you could completely drain the box and refill with your chosen oil.

If it's any help, the auto-box in my Rover that i use Carlube ATF-U in is a thinly disguised manual box with electro-hydraulic control of the shifting and it works very well in that.
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Old Aug 21st, 2018, 14:12   #17
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Quote:
Originally Posted by bob12 View Post
The handbook also says firstly .... "Manual: Volvo synthetic transmission oil".
Yes, I noticed that but it's a little open ended for my liking without a specific Volvo part number......

At least the alternative of Type F/G pins it down to a definitive performance specification.
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Old Aug 21st, 2018, 19:40   #18
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Guess it's a drain and refill, but even if that means a change between synthetic and mineral, or vice versa, that's not recommended. Maybe I will draw a small sample and send it off for a simple analysis to my friendly lab. guys. Eventually, I will update this post, but don't hold your breath/s!! Bob
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Old Aug 22nd, 2018, 15:21   #19
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Quote:
Originally Posted by Laird Scooby View Post
.....the auto-box in my Rover ..... is a thinly disguised manual box with electro-hydraulic control of the shifting and it works very well in that.
So are you saying 827 has an AMT, not a torque converter type....??
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Old Aug 22nd, 2018, 16:02   #20
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Quote:
Originally Posted by rwdkev View Post
So are you saying 827 has an AMT, not a torque converter type....??
Yes and no - it still has a torque converter but unlike the majority of automatics, it doesn't use epicyclic gear train sets to get the ratios. Instead of using brake bands to stop the outer planetary ring gear to force a ratio change, it uses hydraulic pressure to activate clutch packs which take the place of the selector forks/rings in a manual box.

This might explain it a bit better :

https://www.lingshondaparts.com/hond...0?mod_01=21340



That's the auto box, i've used the countershaft assembly to illustrate how close it is to a manual box.

By comparison, the manual :

https://www.lingshondaparts.com/hond...1&block_05=hcr



Spot the difference!

Now compare it to this cutaway view of a ZF4HP22 "traditional" automatic box :



As you can see, the planetary gear sets are going to be much heavier, make the box longer and overall, much less efficient. Also the Honda/Rover box has a two-stage lock-up clutch on the torque converter which is handy for improving economy when driving and because of a clever set-up on over-run, gives vastly improved engine braking over the traditional auto box.
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