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You can find the original how-to published on my page with pictures at: thoughtdraw.wordpress.com
Before starting this tutorial on changing and installing a new differential for your MX5, have a look at this link if you are interested / unsure what a differential is or how it works,this provides a good explanation.
Before starting this tutorial on changing and installing a new differential for your MX5, have a look at this link if you are interested / unsure what a differential is or how it works,this provides a good explanation.
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Signing UpStep 1Diagnosis
Diagnosing a problem is actually quite easy once you understand what's going on. Anyone who drives will have at some point heard a funny noise or felt something wasn't quite right. This is the first stage to fixing a problem- identify that one exists. I will now work through the logic of diagnosis.
In my case the interior of the car was filled with an awful whining sound. I know it can't be a wheel bearing, experience tells me they make a lower "wub wub wub" noise. Secondly this is usually only heard when the car is rolling, (regardless of acceleration, coasting etc). Also, expect for wheel bearing noise to increase or decrease depending on cornering loads. In my case the sound went away when i rolled along in neutral.
We now know that by removing the power the noise goes, hence, it must be 'powertrain' . Powertrain components essentially consist of engine and gearbox. It can't be the engine, the noise was not changing with engine speed. Stop and think, if revving the engine does not immediately speed up the whine, it can't be connected to the engine- and my sound wasn't. In fact, if the diff is failing, the frequency and pitch of the noise must be directly linked to road speed. Road speed is associated with gearbox and in particular the output of the gearbox, consisting of the layshaft, final drive and differential.
Identifying the component making a loud whining noise is not easy, the noise fills the cabin. In the end I made an informed guess! With some input from my Dad and a work colleague, it was decided that the most likely culprit on my car- a Jap import , was the early spec viscous limited slip diff (LSD).
In my case the interior of the car was filled with an awful whining sound. I know it can't be a wheel bearing, experience tells me they make a lower "wub wub wub" noise. Secondly this is usually only heard when the car is rolling, (regardless of acceleration, coasting etc). Also, expect for wheel bearing noise to increase or decrease depending on cornering loads. In my case the sound went away when i rolled along in neutral.
We now know that by removing the power the noise goes, hence, it must be 'powertrain' . Powertrain components essentially consist of engine and gearbox. It can't be the engine, the noise was not changing with engine speed. Stop and think, if revving the engine does not immediately speed up the whine, it can't be connected to the engine- and my sound wasn't. In fact, if the diff is failing, the frequency and pitch of the noise must be directly linked to road speed. Road speed is associated with gearbox and in particular the output of the gearbox, consisting of the layshaft, final drive and differential.
Identifying the component making a loud whining noise is not easy, the noise fills the cabin. In the end I made an informed guess! With some input from my Dad and a work colleague, it was decided that the most likely culprit on my car- a Jap import , was the early spec viscous limited slip diff (LSD).
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