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I finally got round to checking why my gear stick was moving up and down as it had gotten noticeably worse yesterday. It turns out my PPF has a huge crack in the centre which is allowing the gearbox to move up and down ( and the gear stick). I've sourced a second hand part but due to time (and knowledge) restraints I am going to get my local garage to fit it for me as I am due an MOT anyway.

I have tried searching for some instructions as from what research I have done it seems it can be a bit of a pain to remove and can be tricky if you have never done the work before or are not a mx5 specialist garage.

So I am just looking for some advice, maybe some little tricks that I can pass on the the garage doing the work to make it easier for them.
 

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The diff is bolted on with threaded bushes that dowel the PPF to the diff. They're splined/knurled on the outside to stop them rotating on assembly.

Undo the bolts, clean up the threads, then reinsert the bolts a thread or two and hit them upwards to knock the bushes out.

Also make sure they get plenty of penetrating fluid on them first to stop the bushes spinning in the PPF.
 

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apologising from the heart of my bottom
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Mark the position of the box on the PPF BEFORE removal
Make sure the garage do this after fitting:

http://www.mx5nutz.c...showtopic=55139

Marking the position of the old one is no guarantee it'll be correct
[/quote]

true but if it goes back in the same place it's always been there is almost zero chance of the vibrations that occur when it's not marked
 

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[=#0000FF]true but if it goes back in the samer place it's always been there is almost zero chance of the vibrations that occur when it's not marked[/color]
Who says its current position is correct is my point. You've no idea if a previous owner has had the clutch changed and this alignment was not done.

Honestly it's just easier and guaranteed to be right if you align it once the jobs done.
 

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apologising from the heart of my bottom
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[=#0000FF]true but if it goes back in the samer place it's always been there is almost zero chance of the vibrations that occur when it's not marked[/color]
Who says its current position is correct is my point. You've no idea if a previous owner has had the clutch changed and this alignment was not done.

Honestly it's just easier and guaranteed to be right if you align it once the jobs done.
[/quote]

no it's not richy

as you know the prop runs through a fixed angle, if it runs smooth mark it & put it back in the same place, simples
 

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[=#0000FF]true but if it goes back in the samer place it's always been there is almost zero chance of the vibrations that occur when it's not marked[/color]
Who says its current position is correct is my point. You've no idea if a previous owner has had the clutch changed and this alignment was not done.

Honestly it's just easier and guaranteed to be right if you align it once the jobs done.
[/quote]

no it's not richy

as you know the prop runs through a fixed angle, if it runs smooth mark it & put it back in the same place, simples
[/quote]

John, a question for you, if the old PPF had been removed for a clutch change and not put back in the correct place, marking this now incorrect place will leave you with what?

Bear in mind the PPF is now currently cracked so if it is running 'smooth' it'll be at a different angle than a non cracked PPF anyway!

Why are you so against just measuring up the angle anyway it can't hurt to check it properly for the 5 minutes it takes rather than assuming!
 

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It's not the destination, It's the journey
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apologising from the heart of my bottom
Joined
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5,795 Posts
[=#0000FF]true but if it goes back in the samer place it's always been there is almost zero chance of the vibrations that occur when it's not marked[/color]
Who says its current position is correct is my point. You've no idea if a previous owner has had the clutch changed and this alignment was not done.

Honestly it's just easier and guaranteed to be right if you align it once the jobs done.
[/quote]

no it's not richy

as you know the prop runs through a fixed angle, if it runs smooth mark it & put it back in the same place, simples
[/quote]

John, a question for you, if the old PPF had been removed for a clutch change and not put back in the correct place, marking this now incorrect place will leave you with what?

Bear in mind the PPF is now currently cracked so if it is running 'smooth' it'll be at a different angle than a non cracked PPF anyway!

Why are you so against just measuring up the angle anyway it can't hurt to check it properly for the 5 minutes it takes rather than assuming!
[/quote]

if a ppf is not in the correct place but runs smooth all is good

however if it is measured & put back in a different place the angle alters & the prop runs through the 'tightspot' in the UJ causing vibrations though the body/seats of the car in a lot of cases
 

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As I was suggesting, the new PPF has come from a different car and presumably wasn't marked before being removed.

Marking the current PPF and transferring measurements still only gets you in the ballpark. With the number that were made, it's unlikely they were even made on the same set of dies, never mind the variation you'll get part to part.
 
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