BigJimnyMeet (North) 2024 (12 Jan 2024)
14th July 2024
Parkwood Nr. Leeds
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Severe vibration 1800 to 2200 rpm
- darhijo
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- Dave Biezen
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And i carefully thightened the pinion nut on the rear diff
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- darhijo
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- Dave Biezen
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Then i went with the original clutch from Suzuki and the vibrations were gone for 85%
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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.
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- Dave Biezen
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Also the original disc has some sort of HPPE stoppers that also absorb noise and vibration.......
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- bling blang
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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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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.
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- Derek
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- Derek
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- Derek
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- Dave Biezen
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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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