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Severe vibration 1800 to 2200 rpm

  • darhijo
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17 Apr 2017 05:33 #180314 by darhijo
Replied by darhijo on topic Severe vibration 1800 to 2200 rpm
hello, no one has solved these vibrations?

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  • Dave Biezen
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17 Apr 2017 06:24 - 17 Apr 2017 06:29 #180315 by Dave Biezen
Replied by Dave Biezen on topic Severe vibration 1800 to 2200 rpm
Almost totally gone....after replacing with an original jimny friction plate....the one with the three large springs.
And i carefully thightened the pinion nut on the rear diff
Last edit: 17 Apr 2017 06:29 by Dave Biezen. Reason: Incomplete

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  • darhijo
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17 Apr 2017 16:27 #180341 by darhijo
Replied by darhijo on topic Severe vibration 1800 to 2200 rpm
You have replaced the clutch?

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  • Dave Biezen
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17 Apr 2017 16:44 #180344 by Dave Biezen
Replied by Dave Biezen on topic Severe vibration 1800 to 2200 rpm
Yes,...i tried a LUK, Valeo and Sachs without improvement.
Then i went with the original clutch from Suzuki and the vibrations were gone for 85%

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05 May 2017 13:09 - 09 May 2017 17:19 #180931 by yakuza

Dave Biezen wrote: Yes,...i tried a LUK, Valeo and Sachs without improvement.
Then i went with the original clutch from Suzuki and the vibrations were gone for 85%


Just a thought:
I work sometimes to minimize vibration in mechanical designs and noticed that the Lukas clutch i bought got three springs while the original japanese has four springs. I am guessing that this has litte or no effect on the clutch function since the spring pressure is as easily divided on three instead of four springs, but this will have an effect on the clutch plates internal vibratory frequency.
On my car there is little or no vibration when there is no load on the drivetrain, but vibrations when accelerating or descelerating.
my vibrations is also most noticable around 2000rpm.
When changing the mass of one of the items in the system, other items can come close to other items internal vibratory frequency and the total system can come out of balance.
We sometimes fix vibratory problems by changing the mass, moving bearing placements or changing rpm.
Edit: Also the transmitted torque plays a part so it is plausible that this is the case.
Prediction of these problems is allmost impossible, but as in all other things mechanical, if it works, do not fix it.
I would recommend changing clutch to original one or at least one with similar mass and design now that we know of these problems.

Norway 2005 Jimny M16A VVT, 235 BFG MT, 2" Trailmaster, ARB rear lck, 17%/87% high/low gears.
Last edit: 09 May 2017 17:19 by yakuza.

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  • Dave Biezen
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05 May 2017 15:02 - 05 May 2017 15:08 #180932 by Dave Biezen
Replied by Dave Biezen on topic Severe vibration 1800 to 2200 rpm
I guess that the original cluth has much more movement to adapt. For example: the sachs or valeo friction discs have 6 coils/springs...therefore the rotational buffer is very small....lets say 4 or5 degrees. While the original disc has a movement of 15 degrees.
Also the original disc has some sort of HPPE stoppers that also absorb noise and vibration.......
Last edit: 05 May 2017 15:08 by Dave Biezen.

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  • bling blang
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07 May 2017 21:58 #181033 by bling blang
Replied by bling blang on topic Severe vibration 1800 to 2200 rpm
I've just bought a Jimny, bit of a giggle I must say.

BUT

I have these vibrations (which I didnt pick up when test driving as I was giving it the beans). Its a '99 with the older engine. 3rd, 4th and 5th 1700-2100 rpm when on part or full throttle it vibrates like crazy. When held at this engine speed in neutral it is absolutely smooth. The engine mounts appear to be ok (hard to properly check the rear without removing). I suspected a bad mount so strapped the engine to the chassis with a ratchet strap to see if it moved the resonant frequency but no change at all.
The previous owner had a new clutch fitted (blue print item) new timing belt, also the driveshaft between g box and t box looks fairly new.

Reading previous posts this doesnt seem unique. I figure it could be clutch, hard engine mounts or the crank pulley (which I believe has a bonded rubber section. Has anyone got any further with a solution, before I go for the clutch change - probably the cheapest and most time consuming ?

Bob

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09 May 2017 17:14 - 09 May 2017 17:16 #181082 by yakuza

bling blang wrote: I've just bought a Jimny, bit of a giggle I must say.

BUT

Reading previous posts this doesnt seem unique. I figure it could be clutch, hard engine mounts or the crank pulley (which I believe has a bonded rubber section. Has anyone got any further with a solution, before I go for the clutch change - probably the cheapest and most time consuming ?

Bob


I have not removed my clutch to see if the vibrations disappear, but i did get the vibration when going from a 4 spring clutch to a three spring clutch.
I have the newer m-type engine (actually M16..) but the clutch and flywheel is the same. (it's the same clutch from 1984 to 2017 i guess)
But otherwise it is thesame on my car, vibrations only when on load/clutch out, 1800-2200 mostly at 2000rpm.
Edit: cannot find anything wrong with any of my mounts either.

Very tempting to change the clutch to see if it changes, but as you say, time consuming and i do not have a lift..

Norway 2005 Jimny M16A VVT, 235 BFG MT, 2" Trailmaster, ARB rear lck, 17%/87% high/low gears.
Last edit: 09 May 2017 17:16 by yakuza.

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  • Derek
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15 Jun 2018 16:36 #193494 by Derek
Replied by Derek on topic Severe vibration 1800 to 2200 rpm
Was this problem ever resolved? As I have the same problem on similar circumstances ie Jimmy with severe resonance 2800 to 2200rpm 3,4,5 gear after gearbox refurbished.

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  • Derek
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15 Jun 2018 16:42 #193495 by Derek
Replied by Derek on topic Severe vibration 1800 to 2200 rpm
Can the topic be reopened?

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  • Derek
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15 Jun 2018 16:48 #193496 by Derek
Replied by Derek on topic Severe vibration 1800 to 2200 rpm
Yes the gearbox refurbished and clutch replaced. Then the problem and gearbox removed and rechecked and another new clutch fitted.Then rear engine/gearbox mount replaced. Problem still there!!

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  • Dave Biezen
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15 Jun 2018 16:53 #193497 by Dave Biezen
Replied by Dave Biezen on topic Severe vibration 1800 to 2200 rpm
No,..almost gone....but almost all these vibration issues appear after removal of the gearbox....
I have replaced the whole gear train...GB, TC, diff, shafts and so on....but only when I replaced the 6 or 4 spring clutch by an original SGP 3 spring clutch i noticed great improvement...
What makes the vibration worse is the backdoor support and the rubber thing you can screw in or out. If those things are allright...only the mirror vibrates a little

Cheers

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