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my new gearbox? (Mazda MX-5 to TR)


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7 minutes ago, Z320 said:

I can imagine it is a lovely job to get the screws in there!

This is why I was pleased to slip it below that lip.

Yes it is hence why a lot of people dont either!

Stuart.

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Ups, the adaptors are already delivered, I'm really surprised about the laser cut surface! Tomorrow will be first fit, please keep fingers crossed for me.  

Thanks Russell and Andi, thank you very much, all worked well, fit was 100% on first attempt, the 8 mm drills are exaxtly to the point they have to be for the 5/16" bolts! Btw, the bar is on

Talking of gearbox changes, back in the 8o`s when I was involved with Jaguar racing we converted a V12 XJS from a GM 400 auto box to a Cosworth T6 manual 5 speed by a cut and shut of the two bell hous

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I hope with the engine already lowered 5 mm,

the tunnel cover fitted on top of the bulkhead lip and 2-3 mm more aluminium off the gearbox housing it fits...?

gRcqpBVaP99W9G0s0Ku6FFBg__we9lWTKbwSfV3L

This looks like more effort as it is....

Ciao, Marco

Edited by Z320
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  • 3 weeks later...

Hi there,

this old lady found her way in my garage for a very reasonable price, perhaps to retire, perhaps to start a 2nd life.

hs1_sq5WkTU2Fg9B2P2Zfx8gHsQqRUBsmKR-Pe5S

But mainly to make photos with here sister (before she moves in the TR) and to try to fit my 2 remaining adapter plates (they do perfectly).

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7SeloK1CqeoAmM167MN1t9y7WrXWNfYIV-RTRyRc

One question is also: is the way to move the lever indeed much shorter on the MX-5 gearbox than on the TR gerabox?

I guess it is not at all and I made my aluminium lever about 20 mm too long.

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The photo with the TR gearbox next to my new old lady will be very interesting (if his is an issue of interest at all?).

Ciao, Marco, preparing the TR ready for TÜV today (LED bulbs out)

 

Edited by Z320
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9 hours ago, YOW500 said:

Marco.

A very nice piece of engineering indeed, all credit to you.

Look forward to its test drive.

How on Earth do you manage to keep your workshop so clean all the time LOL.

Russell

House elves?

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On 5/10/2021 at 2:50 PM, YOW500 said:

How on Earth do you manage to keep your workshop so clean all the time LOL.

Russell

Thank you very much,

this is at my garage where normaly my BMWs are parking,

so this is more a "exposition area" :)

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Hi,

shure lots of you heared about the MX-5 gearbox is a LOVELY short shifter, while the TR gb with its long lever is this not at all.

But I could not beleave this because the construction in not basicly different....so today it was time to check.

In the TR

Vtc3tU59_8uu72boM9RO9-9uipW8e74LygWO6-yc

1st, N, 2nd

XXfRtcipUAcGs32xZUK06rRAHRWqFq5aTImBkxWP   LtAFd2PaKgcgOQ5KIh0pSZyDNQtzvrMByGAdzpX0   CXmqbunxDS-EToNNQgRjBeslhlWgLCwIZOXxmz7r

On the MX-5 gearbox without lever knop!

AsFWAnaVV_XNtBZoxTd9jC2mM9zfvPzDtlligNMT

Ups, sorry me, my wife called me for a cafe.

 

 

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1 hour ago, Z320 said:

I've been told you Brits like to bet?

What do you think?

Marco - The TR has got to be better - its a triumph TR for heavens sake!

Cheers Rich

PS - no reflection on your engineering skills which are breathtaking to a blacksmith like me:wub:

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This is the result from the MX-5 gb (with the missing lever knop)

1st, N, 2nd

3PiD-ZqOV0jp4OG4qmMzahsniW-S420UzjVmV4hF  fha2GaXV0UBO8k8N3ufybWg1C2AbWPLnBemmQc4o  JqVoaMHTEMiG3_GdgNkhGZOMgYyMppIOcz67roNA

It's about the same! Why this result?

Without a scale we are not objective in our observation (hudge moon low above hill in close distance VS tiny moon high on the firmamen)

The long visible TR lever suggests a long way of movement

while most of the MX-5 lever is not visible covered by he tunnel and suggests a short movement.

Or just wishful thinking....

Ciao, Marco

Edited by Z320
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1 hour ago, Z320 said:

This is the result from the MX-5 gb (with the missing lever knop)

1st, N, 2nd

3PiD-ZqOV0jp4OG4qmMzahsniW-S420UzjVmV4hF  fha2GaXV0UBO8k8N3ufybWg1C2AbWPLnBemmQc4o  JqVoaMHTEMiG3_GdgNkhGZOMgYyMppIOcz67roNA

It's about the same! Why this result?

Without a scale we are not objective in our observation (hudge moon low above hill in close distance VS tiny moon high on the firmamen)

The long visible TR lever suggests a long way of movement

while most of the MX-5 lever is not visible covered by he tunnel and suggests a short movement.

Or just wishful thinking....

Ciao, Marco

do i win a prize :D

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Hi,

with new TÜV since Wednesday I started today to get the TR gearbox out (after doing other thinks).

This is not of special interest but I want to point on a few things. No joke: disconnect the battery.

dBz14pYKJtKwlik8nyXy80YSqgRMwzpWxqXEoK5L

One thing I really bottered (not worried) was to get the propshaft out to the rear.

I've been told this does not work, but this way I have to get the MX-5 propshaft in because it sildes in the gearbox!

eFwD5ePoesUnZG4XvtRQISdnegzRYdLRjEDxDdHK

That looks good? Indeed it worked very well to get it out to the rear.

Next photo there are 2 things I want to point on:

- my modified crossmember (a previous owner made that), this makes it very easys to slide it out with the rear gb mounting to change it

- my own made exhaust clamp, after serveral other stuff did not work

7PjZj7M4cIqCrG9IUvxJMjUtLd3ghBVoFIV82iR0

OK, I overdid it....but I never had problems with it....

ypvIHKj6iZNhd_1JP0VaawX1ZN4_urq0xSIaWoAU

That's it already for today, sorry

Ciao, Marco

 

Edited by Z320
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Hi there,

during the week I was busy at work - and had a free day today to put the gearbox in.

A last look at the shifter lever in relation to the gearbox tunnel - I hope the MX-5 shifter housing will not touch the H-fame.

JC-e-B-oyzlBqK0iN2y-ygG-heqVxOCJGyR95lOa

Next you see my gearbox tunnel is below the lip on the bulkhead (with a foam between), it was this way when I bought the car.

Fitting it up on the lip will give me some more [mm] clearance.

KIQ1qmfSOaiZ-Xq1I5YX7WEDeXG7BzTc3baWtk7j

With the cover off you see the main challange of fittig it: the MX-5 gearbox is about 10 cm longer!

I hope I can get the rear end backwards under the tunnel...

MLr5gtwvcr3ZCDJH-thM-oTjllh695EAG0yje8vi

TR gearbox out with my crane

t0heGinlkoUSqeCyPlysw8Bwlyz3EXVtCiNhr40D

A last time I check the old B+B clutch, it is still tight with 2.2 mm gap on each of the 6 bolts and would be good for some more years.

WRN4Yz_HwTMO89kRhHDgDOcQzM7fsN1tonwkIZrQ

Flywheel off to change the pivot bearing. What makes me wonder looking behind the flywheel the first fime: no oil there at all (sealed?)...?

zGoZ86boCv7DJ2AOxRum2ikJQ_tHaUdMFv5sM5i6

New one in, it fitted lovely with a tight sliding fit

QYW8T2AbOfqq1lMLdB2ZtyybC-4WSnpTKF5QPumU

With the adapter plate fitted I realized the gap to the bulkhead is OK, just on one point the gap is only 2 mm; with a rasp I made it 5 mm.

lEtJ8X_Re5MNU6kqhtttiplRcnSXJM2f-UungBdk

Work in progress

qej9CZMsCKt4Pne61L3VGyjvBlNXomuuDjl8yT1C

A short brake to compare the gearboxes, the shaft on both ends exactly on the same height

qV6wEAZA0xnuV_lbOQWqq7SJqpIFiaXUV-dJ3qMQ

The lever may be OK, but I will get problems with the H-frame

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The new Aisin clutch in, it has the same size as the B+B clutch plate, but the teethed sleeve is Mazda, cover is the old B+B.

2Cs15DLtTpXK2hCD3MTSNvISsBW7vE9YIqLwa5Qw

With the gb on the crane the annoying part of the day started

MQOh6EdRCQ3igIiy1Hr9iMkFP1yJJcFo7J-mrtfA

It is not possible to move the rear end under the tunnel first because there is not enough room in the passanger footwell,

and not between the air duct as part of the bulkhead and the foor....

ZIj8nKgwfjFNcc8m9LzhKbqeV60eHUIINHwRo-fN

My hacksaws had to solve the challenge.

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In

7djUz3usya1OB_SR9oJFRYSz7pwwUoO_4nPsISRk

Feierabend for today

Ciao, Marco

Edited by Z320
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Love this engineering saga.

 
can’t wait for the test drive. 

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1 hour ago, Hamish said:

Love this engineering saga.

 
can’t wait for the test drive. 

Me too, but this will be not very fast, currently I also fit a new soft top....

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On 4/19/2021 at 5:11 PM, Z320 said:

I can imagine it is a lovely job to get the screws in there!

This is why I was pleased to slip it below that lip.

Move to using TR6 rear wing lamp housing fixings

518454 + UL2706 + WM 57

90A11054-0C9F-4423-B39C-CEBABF43E11E.jpeg

A73626EB-D70B-4E66-9249-0DD01105F655.jpeg

A44A432A-8101-450F-ABD6-9E2363A2AAF3.jpeg

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Fitted the nuts on the adapter studs and connected the clutch hydraulic

wR2rcCU5ec2K03Nso0WQ5-aydg5NqFUN7QSycbAm

Fitted the rear gearbox mount, the speedo drive and the lowered crossmember

0nZAdeVooeMKXb1pvRicN6cRc2DB6XBKoCmf3FOL

Made a new (solid) exhaust clamp (to protect the speedo drive from heat the exhaust pipe will be wrapped later with insulation tape)

2-51u7ynl0hJypSoGnOrApYEVssDlf6lhnmoC3UP

Dismantle the diff flange, a bit an annoying job to bend out the solid 2 mm wire with the very limited space.

The surface for the lip seal is smooth.

1bKL8g1VLg-LPglCODcaMPnfJ4o22rrOTrkLTQ3c

Now the problems started: the shifter housing does not fit under the console of the H frame (I will cover this later)

To fit there it has to be about 40 mm more foreward - perhaps a challange for my second MX-5 gearbox.....one day...sooner or later

Qux5QwrqogUmtMRVi6rdCyEpSK2BR7p-_NO-Tor-

And the next problem: the shifter is to high, it touches the console from below.

WeRquhiAqO4oz8vKhmS3WRLMsA8nQRMZndZbT0yh

Because I don't want to cut the console out much more I have to lower it the red way - or better the green one....

vifKxnp-IY4YYA64eIKiUESKOKNruTdU_SqAsC2p

Well, it can't work all on the first attempt...

Ciao, Marco

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1 hour ago, Z320 said:

Fitted the nuts on the adapter studs and connected the clutch hydraulic

wR2rcCU5ec2K03Nso0WQ5-aydg5NqFUN7QSycbAm

Fitted the rear gearbox mount, the speedo drive and the lowered crossmember

0nZAdeVooeMKXb1pvRicN6cRc2DB6XBKoCmf3FOL

Made a new (solid) exhaust clamp (to protect the speedo drive from heat the exhaust pipe will be wrapped later with insulation tape)

2-51u7ynl0hJypSoGnOrApYEVssDlf6lhnmoC3UP

Dismantle the diff flange, a bit an annoying job to bend out the solid 2 mm wire with the very limited space.

The surface for the lip seal is smooth.

1bKL8g1VLg-LPglCODcaMPnfJ4o22rrOTrkLTQ3c

Now the problems started: the shifter housing does not fit under the console of the H frame (I will cover this later)

To fit there it has to be about 40 mm more foreward - perhaps a challange for my second MX-5 gearbox.....one day...sooner or later

Qux5QwrqogUmtMRVi6rdCyEpSK2BR7p-_NO-Tor-

And the next problem: the shifter is to high, it touches the console from below.

WeRquhiAqO4oz8vKhmS3WRLMsA8nQRMZndZbT0yh

Because I don't want to cut the console out much more I have to lower it the red way - or better the green one....

vifKxnp-IY4YYA64eIKiUESKOKNruTdU_SqAsC2p

Well, it can't work all on the first attempt...

Ciao, Marco

Fit a TR4 centre yoke

 

s-l1600.jpg

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