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Danny
tinkerer


Joined: 10 Oct 2001
Posts: 100

PostPosted: Mon Mar 18, 2002 2:11 am    Post subject: help Reply with quote

i dunno whats goin on but when the gem does exactly 100 it sorta hums like somethings vibrating or something i dunno it could be the exhaust ive been told but i dont think thats right

any help would be greatly appreciated
cheers
danny
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Badger
tinkerer


Joined: 13 Feb 2002
Posts: 155

PostPosted: Mon Mar 18, 2002 1:15 pm    Post subject: Re: help Reply with quote

probably you have a panel or something which has a harmonic at the frequency at 100km/h. all you can do is try to find out what it is and make it a bit heavier or damp it. a bit of silicone on the panel etc should do the trick, IF you can find what it is...
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Phil
tinkerer


Joined: 05 Oct 2001
Posts: 170
Location: Brisbane/Sunshine coast

PostPosted: Mon Mar 18, 2002 1:54 pm    Post subject: Re: help Reply with quote

Yeah me and my mate (who also has a gemmy) have that same problem. Right on about 105km/h something hums really frikkin loud (I thought it was the diff)
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RedTG
tinkerer


Joined: 04 Feb 2002
Posts: 136

PostPosted: Mon Mar 18, 2002 1:59 pm    Post subject: Re: help Reply with quote

Mine too, but it is the new tyres, could be anything, something rubbing under the bonnet, err wheel bearing, diff, panels, who knows??

Regards
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Mooch
backyard mechanic


Joined: 17 Oct 2001
Posts: 573

PostPosted: Mon Mar 18, 2002 6:12 pm    Post subject: Re: help Reply with quote

had the same prob on my TE, and just recently solved it on the wagon too. During the recent sorta rebuild we replaced the wheel bearings and also had the tailshaft re balanced. If it's at that speed on;y it means that is something that spins at a certailn rpm. If it was anything else it'd only do it at that rpm in any gear. ie say u r doin 3500 rpm at 105 kays, then at 3500 in 2nd gear it would also do it. However the tailshaft and wheels on;y spin that fast @ 105 kays regardless of engine rpm. If it gets worse when u steer either left or right a bit it's the wheels bearings.

Get them done anyway, doesn't hurt to and ur stubs will thank u.
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RedTG
tinkerer


Joined: 04 Feb 2002
Posts: 136

PostPosted: Mon Mar 18, 2002 6:15 pm    Post subject: Re: help Reply with quote

Is yr car a 4 spd or 5 spd, could be high revs???


regards
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mana
tinkerer


Joined: 06 Feb 2002
Posts: 169

PostPosted: Tue Mar 19, 2002 12:03 am    Post subject: Re: help Reply with quote

yeah i had that aswell- check the amount of free play in the torque tube
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Gene FJ20DET
hod rodder


Joined: 06 Oct 2001
Posts: 9163
Location: brisbane

PostPosted: Tue Mar 19, 2002 12:09 am    Post subject: TOO LOW!! Reply with quote

if u have lovered ya car then it most probably be the tail shaft. iv had it happen to 4 geminis and i experimented over and over and thats what i found it to be. u just have to put up with it. if not it will be ya tourqu tube center bearing/rubber
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Pete
backyard mechanic


Joined: 05 Oct 2001
Posts: 502

PostPosted: Tue Mar 19, 2002 12:50 am    Post subject: 4000 RPM?? Reply with quote

is it more the rpm?
if its 105km/h ONLY then it has to be the tyres.
if its 4000 rpm then its a pannel/loose bolt etc.
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greg j
backyard mechanic


Joined: 05 Oct 2001
Posts: 534

PostPosted: Tue Mar 19, 2002 6:10 pm    Post subject: Re: TOO LOW!! Reply with quote

thanks gene i think u just solved my problem too.
greg.
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