Manual Trans Rattle
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Manual Trans Rattle
Hi Guys,
I'm in the market for a 1.8 6Spd NB at the moment. I've test driven about 4-5 and a problem I've noticed on a couple is when you are doing 40-50k, and you put it in 6th and put your foot down, you get a definite metallic rattle out of the trans.
I had an old NA VSPEC years ago, and this did this too, yet the NA I got after that didn't.
This problem has occurred in 3 of the 5 cars I've tested and it's put me off each time. The dealer told me it's because I was going too slow for 6th (probably true but I was testing for the noise) and it was laboring the trans. It doesn't occur at more reasonable speeds, 70+. My old man said that's probably true (he's a mechanic) yet I'm still not sure.
Any of you guys have any experience with that problem?
I'm in the market for a 1.8 6Spd NB at the moment. I've test driven about 4-5 and a problem I've noticed on a couple is when you are doing 40-50k, and you put it in 6th and put your foot down, you get a definite metallic rattle out of the trans.
I had an old NA VSPEC years ago, and this did this too, yet the NA I got after that didn't.
This problem has occurred in 3 of the 5 cars I've tested and it's put me off each time. The dealer told me it's because I was going too slow for 6th (probably true but I was testing for the noise) and it was laboring the trans. It doesn't occur at more reasonable speeds, 70+. My old man said that's probably true (he's a mechanic) yet I'm still not sure.
Any of you guys have any experience with that problem?
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Sometimes the exhaust pipe protective covers can vibrate when you are labouring the car. It could be these...
I know on the NA's there is a steel gasket between block and the bellhousing. There is a screw that bolts part of this gasket to the block to stop vibration. If this screw comes loose the steel gasket can vibrate at low revs. Unfortunately you have to split the gearbox to see the screw as it is near the flywheel (Close to where the dipstick is).
I know on the NA's there is a steel gasket between block and the bellhousing. There is a screw that bolts part of this gasket to the block to stop vibration. If this screw comes loose the steel gasket can vibrate at low revs. Unfortunately you have to split the gearbox to see the screw as it is near the flywheel (Close to where the dipstick is).
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Manual Trans Rattle
Sounds more like pinking (preignition), 6th and flooring it at less than 50k
is bad for the engine and asking for trouble.
[Posted via external email]
is bad for the engine and asking for trouble.
[Posted via external email]
Gazda in the white HOT Mazda
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Manual Trans Rattle
Just like that bonnet rattle everyone gets seems to come form the glove
box...
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box...
[Posted via external email]
Gazda in the white HOT Mazda
Absolutely it's "pinging" - pre ignition.
50km/h in top gear is only 1500 rpm.
Surprisingly hard to pinpoint the sound location, but drive alongside a concrete barrier with the hood down, and everything is much clearer.
I've heard it in mine too - made me change my driving habits. Around town, drive it like it's a 4-speed. If it's a JDM Nb, use premium (96 octane) fuel.
The 6 speed Aisin AZ-6 gearbox should be strong, same box as in the Altezza/Lexus is 6 speed. Aisin make (made?) boxes/transaxles for Porsche 911s.
The extra gear is mainly superfluous to needs, and probably the only advantage in an Nb is if you like changing gear a lot or plan to turbo it. I still fudge shifts sometimes - I need to think about shifting, but with a 5 speed I don't.
50km/h in top gear is only 1500 rpm.
Surprisingly hard to pinpoint the sound location, but drive alongside a concrete barrier with the hood down, and everything is much clearer.
I've heard it in mine too - made me change my driving habits. Around town, drive it like it's a 4-speed. If it's a JDM Nb, use premium (96 octane) fuel.
The 6 speed Aisin AZ-6 gearbox should be strong, same box as in the Altezza/Lexus is 6 speed. Aisin make (made?) boxes/transaxles for Porsche 911s.
The extra gear is mainly superfluous to needs, and probably the only advantage in an Nb is if you like changing gear a lot or plan to turbo it. I still fudge shifts sometimes - I need to think about shifting, but with a 5 speed I don't.
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Gazda in the white HOT Mazda
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I have a rattle coming from the drive train at 2-3krpm on accel/deccel.
It's not pre ignition.
Thought it was coming from the top of the trans when I stuck my head under the car with a friend on the throttle but I changed to a reasonably fresh 6spd last weekend and it's still there.
I don't think it's the heat shields either.
When I replaced the box I stuck my finger in the splined hole in the centre of the clutch plate and noticed there was a little play there. I'm thinking that the springs in the clutch may have some play and since those springs are bound to resonate at a certain speed any play would cause vibration?
Sounds like a good theory to me anyway.
Loving the 6spd too.
It's not pre ignition.
Thought it was coming from the top of the trans when I stuck my head under the car with a friend on the throttle but I changed to a reasonably fresh 6spd last weekend and it's still there.
I don't think it's the heat shields either.
When I replaced the box I stuck my finger in the splined hole in the centre of the clutch plate and noticed there was a little play there. I'm thinking that the springs in the clutch may have some play and since those springs are bound to resonate at a certain speed any play would cause vibration?
Sounds like a good theory to me anyway.
Loving the 6spd too.
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