http://www.stephenmason.com/cars/mr2speedo.html looks like youve used thsi guide already as you have one of the diagram pictures from it.
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these are the diff part nos as on that site.
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a.33403-19406 Gear sub-assembly, speedometer
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$29.67
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b.83798-17010 Key, speedometer adaptor
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$9.95
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c.33404-17010 Sleeve sub-assembly
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d.83770-17020 Adaptor assembly, speedometer
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$94.17
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e.83798-20020 Key, speedometer adaptor
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f.88261-20070 Sensor, speed cruise
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$121.92
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for diagnosis
time to see what's broken.
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Some of the most common failure modes are the little ears on
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"B" shearing off, a crack in the key end of part
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"A," or, as in my case, key
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"E" simply shearing in half.
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That's right, all this labor just to replace a 50 cent part.
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A picture of my sheared
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"E" key appears below.
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For want of a nail.
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.
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.
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.
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Anyway, I had bought parts
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"A"
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&
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"B" in advance from the dealer, and much to my chagrin, I had to wait a few days for a new
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"E".
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It looked like the sheared pin had somewhat mangled the faces of
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"D" and
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"F", so I ordered replacements for those parts as well.
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I would tend to err on the side of caution, and essentially replace the whole assembly.
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Parts
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"D" and
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"F" are kind of pricey, though, so if your so inclined you can just replace
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"A"
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"B" and
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"E", the most common failure points.
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"A" will come with a new G-clip and O-ring, be sure to use them.
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One annoying aspect of this job is that you can't tell which parts you need until you have it all taken apart.
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.
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.at which point your car is undrivable due to the missing rear motor mount.
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You can wait to get everything apart and only order the parts you need, but you may be in for a wait.
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Alternately, you could order everything and test out your dealer's return policy on 10+ year-old parts.
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Good luck.
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Or you can just replace everything and chalk it up to preventive maintenance.
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I went with the later option.
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hope it helps abit, to have the speedo change over only cost me like 25 quid and I picked up the full replacment speedo drive for another 15
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(used)
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