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Hayneman
#1 Posted : 11 July 2018 19:57:05(UTC)
Hayneman

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I have a well cared-for low-mileage 2007 Mk3 MX5 (27k). The car is great but I now find that the gearbox has become hard to move up or especially down between 4th, 3rd and 2nd gears. This is particularly noticeable when approaching a dual-carriageway roundabout after a long stretch of 70/75 mph running. Changing down from 5th to 4th to 3rd requires some effort.

Also, the clutch judders when moving of from standstill with just a few extra revs. Could it be:

clutch going

clutch needs bleeding

gearbox oil too thin to cope with current hot weather

Any thoughts from the MX5 mass-intelligence database would be gratefully received...

 

Drumtochty
#2 Posted : 11 July 2018 20:23:15(UTC)
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Not the gearbox oil.

Sounds like you need a new clutch slave cylinder but bleed the old one first.
Eddie Cairns

99 Mk2 1.8IS
08 Mk3 2.0 Sport RC sold
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Drumtochty Glen, Auchenblae, Laurencekirk,
Aberdeenshire
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#3 Posted : 11 July 2018 20:28:38(UTC)
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How long since the brake/clutch fluid was changed? If it is more than 3 years then I would start with this and thoroughly bleed the system, also checking the clutch master and slave cylinders for signs of leakage.

If the gearbox oil is still the original then I would also change that, remembering if it is the 5 speed box to add fresh oil to the gearbox turret.

Hopefully this will solve your problem.

2007 2.0l Mk3 Copper Red
PR-Yorkshire
#4 Posted : 11 July 2018 20:28:39(UTC)
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How long since the brake/clutch fluid was changed? If it is more than 3 years then I would start with this and thoroughly bleed the system, also checking the clutch master and slave cylinders for signs of leakage.

If the gearbox oil is still the original then I would also change that, remembering if it is the 5 speed box to add fresh oil to the gearbox turret.

Hopefully this will solve your problem.

2007 2.0l Mk3 Copper Red
Drumtochty
#5 Posted : 11 July 2018 22:09:26(UTC)
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How can gearbox oil do this.
Eddie Cairns

99 Mk2 1.8IS
08 Mk3 2.0 Sport RC sold
18 Mk4 2.0 GT+
Drumtochty Glen, Auchenblae, Laurencekirk,
Aberdeenshire
PR-Yorkshire
#6 Posted : 12 July 2018 16:27:44(UTC)
PR-Yorkshire

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Eddie - only suggested changing the gearbox oil as if OP has the car up in the air to check the clutch slave and the gearbox oil hasn't been changed in 10 years then I would change it at the same time. Will not do any harm and whilst unlikely to cure clutch judder will improve gear change after clutch problem is sorted.

From the symptoms described, clutch judder and difficulty changing gear it is more than likely air/moisture in fluid or leaking master or slave cylinder and not a gearbox problem.

Paul
2007 2.0l Mk3 Copper Red
Drumtochty
#7 Posted : 12 July 2018 16:32:15(UTC)
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Agreed.
Eddie Cairns

99 Mk2 1.8IS
08 Mk3 2.0 Sport RC sold
18 Mk4 2.0 GT+
Drumtochty Glen, Auchenblae, Laurencekirk,
Aberdeenshire
PR-Yorkshire
#8 Posted : 12 July 2018 16:50:45(UTC)
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Originally Posted by: Drumtochty Go to Quoted Post
Agreed.

We normally do Eddie.

My gut feeling is moisture in the fluid that is vaporising when it gets hot after a period of high speed running, could also be being made worse by the recent hot weather.  Might be worthwhile getting a garage to check moisture content of fluid.

 

 

 

2007 2.0l Mk3 Copper Red
Hayneman
#9 Posted : 12 July 2018 16:55:57(UTC)
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Thanks to everyone for their suggestions. The car has been regularly maintained from new, the seals and master cylinders seem fine and the fluids were changed just last year, including the gearbox oil. With all the super-hot weather and some enthusiastic driving I have a feeling that the brake/clutch system needs bleeding after new fluids. Best wishes to all...
PR-Yorkshire
#10 Posted : 12 July 2018 17:03:44(UTC)
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I agree with bleeding the clutch.

Not everyone realises that the MX5 brakes and clutch share the same hydraulic fluid. When changing the fluid they bleed new oil through each brake circuit but forget about the clutch, leaving old fluid with moisture and air trapped in there.
2007 2.0l Mk3 Copper Red
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