Jump to content
SAU Community

Strange Vibration In Trans... 6Sp Man

alex.a
 Share

Recommended Posts

alex.a Community Regular

alex.a

Posted
Posted

hey guys

Recently bought v35 coupe and having a few dramas.

its a 6sp manual and has had a button clutch/lightened flywheel fitted. now im stressing about the transmission as when you first take off (release clutch, load up trasnmission) the gearbox makes this weird vibration/pulsing/deep knocking noise... really noticable through the gear knob (rattles badly). the vibration happens with engine rpm increase... follows it perfectly, definatly something spinning too.

it wont do it on deceleration, nor in netural (with clutch in or out) and i even jacked the rear of the car up, placed in gear and let the wheels spin in the air.... no noise/vibration, so must need load on the driveline.

the engines runs freely, no knocks or noises and the trans shifts smoothly... just the horrid vibration.

i have read plenty of info regarding removing the stock duel-mass flywheel and replacing with a lightened unit creating lots of noises and transfering vibrtions.. but i just cant see this being normal!!

has anyone else out there exprienced something like this?

the only possible things i could think of are

-damaged spigiot bearing?

-worn bearings in trans

-damages imput shaft

-incorrectly fitted clutch/flywheel (but think it would always make noise then)

-excessive lash between gear sets?

-shifter flogged out and just ratteling around with engine rpm (thinking it may be a short-shift kit, very short shifts.. never seen stock to compare)

-worn diff bushes, allowing the diff to move under heavy load, thus moving the tailshaft a tiny bit out of whack?...(prob stupid but taking a stab in the dark)

if anyone can shed some light on the situation i would greatly appreciate it..

sorry if this post is hard to understand, its hard to try and explain the problem. im going to record a vid and upload so you can hear the problem.

thanks guys, alex

Link to comment
https://www.sau.com.au/forums/topic/366915-strange-vibration-in-trans-6sp-man/
Share on other sites
  • 1 month later...
  • 5 years later...
mutex Collaborator

mutex

Posted
Posted

I'm bringing this back from the dead, hoping someone may be able to help.

I have a recent purchase 2004 v35 sedan 6mt with the load vibration/knock/rattle noise on acceleration but not cruise or deceleration in all rpm/all gears.

I replaced the oem dmf clutch with a locally sourced exedy uprated clutch/npc smf kit - NSK-7454SMF, I use Castrol VMX-M 75W-85 transmission fluid.

The first clutch install was botched by a local gtr specialist workshop (it made the noise then), a new clutch was fitted along with my dad/I replacing the important input and output shaft bearings in the CD008 gearbox before reinstallation by another workshop.

After the new clutch install I still have the same acceleration vibration as before.

The pedals/gear knob vibrate badly with the accompanying rattle/knocking noise.

I took the car to a car importer familiar with v35s and he said it was normal for the CD008, and that the CD009 was as better transmission.

I have listened to videos and don't believe it's rod knock or knock from bad fuel, the diff bush is flogged so will be replacing that soon.

Any ideas or 350z/v35 experts in melbourne who may be able to help diagnose please let me know.

 

 

 

 

 

sonicii Veteran

sonicii

Posted
Posted

Not normal for any V35 6MT..  only difference on the CD009 was improved multicone synchos.

Have you checked engine mounts/transmission mount, diff mounts?

How did the first workshop 'botch' the clutch install?  did they possibly cause some damage which is causing the fault and it hasn't been fixed?

mutex Collaborator

mutex

Posted
Posted

The problem was there after the botched clutch install and now after new clutch install. 

The second workshop checked only trans mount, but I'll check all mounts.

I suspect the exedy clutch kit wasn't balanced, but lets see if the mounts are ok.

Interesting that an importer (not the importer of the car) said it's normal, hmm, pretty rough compared with my long throw vibration-free r34 gearbox.

 

 

sonicii Veteran

sonicii

Posted
Posted

If it was normal, it would have been there before the first clutch install.

One of my pet hates is car dealers and sometimes mechanics saying 'they all do that, it is normal'..

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • GTSBoy
      Best place to order Authetic R32 Parts in Japan

      By GTSBoy · Posted

      I don't. I mean, mine's not a GTR, but it is a 32 with a lot of GTR stuff on it. But regardless, I typically buy from local suppliers. Getting stuff from Japan is seldom worth the pain. Buying from RHDJapan usually ends up in the final total of your basket being about double what you thought it would be, after all the bullshit fees and such are added on.
    • GTSBoy
      Ethanol Content Sensor - Always at 11%?

      By GTSBoy · Posted

      The hydrocarbon component of E10 can be shittier, and is in fact, shittier, than that used in normal 91RON fuel. That's because the octane boost provided by the ethanol allows them to use stuff that doesn't make the grade without the help. The 1c/L saving typically available on E10 is going to be massively overridden by the increased consumption caused by the ethanol and the crappier HC (ie the HCs will be less dense, meaning that there will definitely be less energy per unit volume than for more dense HCs). That is one of the reasons why P98 will return better fuel consumption than 91 does, even with the ignition timing completely fixed. There is more energy per unit volume because the HCs used in 98 are higher density than in the lawnmower fuel.
    • GTSBoy
      Blue slip

      By GTSBoy · Posted

      No, I'd suggest that that is the checklist for pneumatic/hydraulic adjustable systems. I would say, based on my years of reading and complying with Australian Standards and similar regulations, that the narrow interpretation of Clause 3.2 b would be the preferred/expected/intended one, by the author, and those using the standard. Wishful thinking need not apply.
    • GTSBoy
      Blue slip

      By GTSBoy · Posted

      Yes they do. For some maybe. But for those used the most by abusers, ie Skylines, the numbers are known. The stock eyebrow height for R32/3 Skylines is about 365/375mm or thereabouts. The minimum such heights are recorded in adjacent columns in the database.
    • soviet_merlin
      Ethanol Content Sensor - Always at 11%?

      By soviet_merlin · Posted

      Hmmm, interesting. Makes me wonder whether there is bias as well. It's the cheapest fuel, so it is used for all kinds of ill-maintained shitboxes which are bound to have issues regardless. Nicer cars tend to require higher octane rated fuel and can't use it anyway. FWIW, the official NSW E10 facts page is decent. 
×
×
  • Create New...