number-1
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| posted on 30/7/12 at 09:47 PM |
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Can i test a gearbox without driving?
Ive got a track only mid engine BEC...Is there a way of testing my gearbox without driving the car? I dont fancy getting a pull and having the car
seized/points/fines/aggro. Ive got no gear shift cable on the engine just the shaft coming out where the gear assembly would bolt on to. I just need
to see if the clutch/ gearbox is working up and down the gears
would this work?
Raise the rear of the car and place thick timber under the frame so the rear tyres are clear of the ground. Put the lever assembly back onto the
gearshift shaft with the original bike shift lever. Start the car and change gear by hand...pushing/pulling the shift lever?
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mark chandler
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| posted on 30/7/12 at 10:24 PM |
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That's how I checked my turbo, driven wheels safely in the air (not just stood on axles stands) and worked through the box.
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number-1
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| posted on 30/7/12 at 10:29 PM |
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Cheers mate. Thats on my ever growing list of things to do 
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maccmike
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| posted on 30/7/12 at 10:35 PM |
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you can do it just off the splined lever by hand
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number-1
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| posted on 30/7/12 at 10:37 PM |
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Mike, without connecting the gear lever assembly?
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maccmike
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| posted on 30/7/12 at 10:46 PM |
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yeah, atleast you can on mine.
[img]
 
[/img]
in the right most of the picture where the clevis is connected to, that splined lever.
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number-1
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| posted on 30/7/12 at 10:51 PM |
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Cheers matey. Ill see if it works tomorrow some time.
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britishtrident
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| posted on 31/7/12 at 05:21 AM |
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Not really ; All a test without driving will tell you is that you are getting the gears, it won't tell you if the box is jumping out of gear
or much about the condition of the bearings.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Slimy38
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| posted on 31/7/12 at 07:13 AM |
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quote:
Originally posted by britishtrident
Not really ; All a test without driving will tell you is that you are getting the gears, it won't tell you if the box is jumping out of gear
or much about the condition of the bearings.
I was going to say the same. On my bike the box is renowned from jumping out of second into neutral when faulty. However it only happens under load,
if you have the rear wheel in the air you can rev all the way to the limit in second and nothing will happen. As soon as it tries to move the bike you
suddenly find yourself with a very clattery neutral and a gearbox replacement job.
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sprouts-car
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| posted on 31/7/12 at 08:17 AM |
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quote:
Originally posted by Slimy38
quote:
Originally posted by britishtrident
Not really ; All a test without driving will tell you is that you are getting the gears, it won't tell you if the box is jumping out of gear
or much about the condition of the bearings.
I was going to say the same. On my bike the box is renowned from jumping out of second into neutral when faulty. However it only happens under load,
if you have the rear wheel in the air you can rev all the way to the limit in second and nothing will happen. As soon as it tries to move the bike you
suddenly find yourself with a very clattery neutral and a gearbox replacement job.
What about using the brake to apply a little load?
Build blog
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britishtrident
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| posted on 31/7/12 at 10:53 AM |
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quote:
Originally posted by sprouts-car
quote:
Originally posted by Slimy38
quote:
Originally posted by britishtrident
Not really ; All a test without driving will tell you is that you are getting the gears, it won't tell you if the box is jumping out of gear
or much about the condition of the bearings.
I was going to say the same. On my bike the box is renowned from jumping out of second into neutral when faulty. However it only happens under load,
if you have the rear wheel in the air you can rev all the way to the limit in second and nothing will happen. As soon as it tries to move the bike you
suddenly find yourself with a very clattery neutral and a gearbox replacement job.
What about using the brake to apply a little load?
In most cases any jumping out of gear happens when the throttle is lifted right at the start of engine braking.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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number-1
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| posted on 31/7/12 at 12:26 PM |
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The reason i ask is, i was having problems selecting 1st and then getting it back to N. ( ive not gone past first as its a track car so driven it in
and out of my garage) I thought at first clutch release was screwed so i took it apart and cleaned it and bled it. Then i noticed the push/pull gear
cable was bent...so...fingers crossed it was just that. The new cable doesnt arrive till midweek and i wanted to double check i can select gears in
case its something that requires a bit more time/effort/money
Im pretty confident under load it will be fine, its just the initial selecting of the gears. Is there any other ways i can test it prior to the cable
arriving?
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