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Mx5 Gearbox Oil Level #607954
13/12/19 08:40 PM
13/12/19 08:40 PM
Joined: Dec 2008
Posts: 18,728
South Yorkshire
DaveW Offline OP
Roadster Guru
DaveW  Offline OP
Roadster Guru
Member of the Inner Circle

Joined: Dec 2008
Posts: 18,728
South Yorkshire
I've mentioned this before. The Mx5 gearbox is canted over to the left on both Duratec and GDI Plus 4s.

So the level plug is angled downwards. When I changed the oil on my 2012, I lifted the nearside a couple of inches or so to get the level plug horizontal. This improved the gear change. More recently I did the same with my GDI. I've written about this in next months Miscellany.

It turns out that in the Mx5, the engine is canted 10 degrees to the right, so the level plug in this application is horizontal.

So it looks like my instinct to lift the nearside was the right thing to do.


DaveW
2005 Corsa Red Roadster S1
2016 Saffron Yellow (Narrow) AR Plus 4
Re: Mx5 Gearbox Oil Level [Re: DaveW] #607976
13/12/19 09:49 PM
13/12/19 09:49 PM
Joined: Aug 2011
Posts: 890
Aberdeenshire
E
Eddie Cairns Offline
Talk Morgan Regular
Eddie Cairns  Offline
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Joined: Aug 2011
Posts: 890
Aberdeenshire
I have serviced loads of Mk3 MX5's and do not believe that the engine is canted 10 degrees to the right!

Can you link to the source of this info Dave.

Re: Mx5 Gearbox Oil Level [Re: Eddie Cairns] #607988
13/12/19 11:00 PM
13/12/19 11:00 PM
Joined: Dec 2008
Posts: 18,728
South Yorkshire
DaveW Offline OP
Roadster Guru
DaveW  Offline OP
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Joined: Dec 2008
Posts: 18,728
South Yorkshire
Originally Posted by Eddie Cairns
I have serviced loads of Mk3 MX5's and do not believe that the engine is canted 10 degrees to the right!

Can you link to the source of this info Dave.


Although I found this yesterday, today I can't find it. I'll look again though.

Not sure if it's just later models, but it said the engine is canted 10 degrees to the right to make space for the induction system.

Ten degrees isn't much, but the level plug on Plus 4's is visibly low.

As an aside the Duratec in Plus 4s isn't centred either, it's offset, but unless you look hard, you wouldn't know!


DaveW
2005 Corsa Red Roadster S1
2016 Saffron Yellow (Narrow) AR Plus 4
Re: Mx5 Gearbox Oil Level [Re: DaveW] #608016
14/12/19 08:33 AM
14/12/19 08:33 AM
Joined: Jul 2007
Posts: 24,450
Cheltenham, Glos. UK
Graham, G4FUJ Offline
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Graham, G4FUJ  Offline
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Don't remember the engine in my Mk1 MX-5 being canted over. Still have a decent manual somewhere, but I doubt it mentions such things.
Only kept the book as it gave a very good description of modern(ish) fuel injection systems.


Graham (G4FUJ)

D8921 L44FOR '93 4/4 Giallo Fly 2 seat smile
'90 LR 90 SW
'06 Saab 9-3 Convertible
Re: Mx5 Gearbox Oil Level [Re: DaveW] #608041
14/12/19 11:00 AM
14/12/19 11:00 AM
Joined: Jul 2014
Posts: 575
Cornwall
griffo Offline
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griffo  Offline
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Joined: Jul 2014
Posts: 575
Cornwall
I don't know how the engine is in an MX5 but I certainly noticed in my 2014 GDI Plus 4 the gearbox is canted over with the filler/level plug lower than the horizontal. I just raised the pads on one side of the two-post lift and lowered them on the other side to get the box more or less level. I then filled with Fuchs Titan Race 75-90 full ester sythetic gear oil. After the change I too thought the gear change was improved - though whether this was my imagination, the improvement in the oil quality over the original or the higher oil level in the box I don't know.

Re: Mx5 Gearbox Oil Level [Re: DaveW] #608069
14/12/19 02:39 PM
14/12/19 02:39 PM
Joined: Dec 2008
Posts: 18,728
South Yorkshire
DaveW Offline OP
Roadster Guru
DaveW  Offline OP
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Still can't find the file which mentions 10 degrees, but this image shows it I think!

[Linked Image]


DaveW
2005 Corsa Red Roadster S1
2016 Saffron Yellow (Narrow) AR Plus 4
Re: Mx5 Gearbox Oil Level [Re: Graham, G4FUJ] #608116
14/12/19 06:47 PM
14/12/19 06:47 PM
Joined: Aug 2011
Posts: 890
Aberdeenshire
E
Eddie Cairns Offline
Talk Morgan Regular
Eddie Cairns  Offline
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E

Joined: Aug 2011
Posts: 890
Aberdeenshire
Originally Posted by Graham, G4FUJ
Don't remember the engine in my Mk1 MX-5 being canted over. Still have a decent manual somewhere, but I doubt it mentions such things.
Only kept the book as it gave a very good description of modern(ish) fuel injection systems.


No Graham, we are talking about the MK3 or NC in Mazda talk from mid 2005 to mid 2015. The ND produced from 2015 onwards had a different engine and gearbox.

Re: Mx5 Gearbox Oil Level [Re: DaveW] #608117
14/12/19 06:49 PM
14/12/19 06:49 PM
Joined: Aug 2011
Posts: 890
Aberdeenshire
E
Eddie Cairns Offline
Talk Morgan Regular
Eddie Cairns  Offline
Talk Morgan Regular
E

Joined: Aug 2011
Posts: 890
Aberdeenshire
I will go out and check a MK3 MX5 next week.

Re: Mx5 Gearbox Oil Level [Re: Eddie Cairns] #608181
15/12/19 09:34 AM
15/12/19 09:34 AM
Joined: Jul 2007
Posts: 24,450
Cheltenham, Glos. UK
Graham, G4FUJ Offline
Salty Sea Dog
Graham, G4FUJ  Offline
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Member of the Inner Circle

Joined: Jul 2007
Posts: 24,450
Cheltenham, Glos. UK
Looking at Dave's photo I realise it's a much later generation.
Only owned the first (1.8i) and driven the current (pre-release) generation. smile
Ta for the heads up Eddie.


Graham (G4FUJ)

D8921 L44FOR '93 4/4 Giallo Fly 2 seat smile
'90 LR 90 SW
'06 Saab 9-3 Convertible
Re: Mx5 Gearbox Oil Level [Re: DaveW] #608330
16/12/19 10:57 AM
16/12/19 10:57 AM
Joined: Feb 2013
Posts: 389
Kent, England
athelstan Offline
Learner Plates Off!
athelstan  Offline
Learner Plates Off!

Joined: Feb 2013
Posts: 389
Kent, England
I'm with Dave on this one. When I first got my GDI I had read Dave's idea that the mx5 gearbox was canted to the left so I searched the MX5 forum to look for the volume of oil advised by the manufacturer - it was 2 litres. The Morgan handbook states 1.5 litres. When I first got the car I decided to change the gearbox oil. I jacked up the car from the left and filled the gearbox with 2 litres. The gearchange was immediately much smoother. After its annual MOT and service I noticed that the gearbox was notchy, the mechanic had obviously checked the gearbox oil on the level and let out the surplus oil from the level plug. In future I will exdclude a gearbox oil check from the service checks.


John
2015 Plus 4 (GDI) Sport Green
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