Vibration on KZJ70

[MrE3]

Hi Guys,

I had an LJ70 (2.4) a few years back which ran on Mud terrain 33" tyres for a few years, this ran great and the motor was very smooth and powerful. I now have a KZJ70 (3.0) and I have a set of BFG AT's 33", but I get a lot of vibration coming through the drive train when pulling at low rev's (30mph in 4th gear for instance) which I don't recall having in the LJ. The engine feels strong and can propel the KZJ to 105mph (on a track ) so its probably OK for power! any thoughts will be welcome.

Best regards

Mark.....

 

[StarCruiser]

Check your CV joints after checking your UJs for play. It's also possibly your wheels are way out of balance or you could have some worn bushes somewhere.

 

[Shayne]

4th gear takes me from 40 mph to about 60 , i might toodle along at idle revs in a row of traffic on a flat road in 4th at 30mph but a hill will make it judder and want to stall so i change down .

KZJ90

 

[MrE3]

Thanks StarCruiser I know what your refering to. I should mention, the Cruiser has just come back from a refurb, new wheel bearings, bushes, brakes, shocks & springs. All other parts checked out OK. The vibration was there before the refurb & hasn't altered. The vibration seems to be engine/Gearbox and not small. If I change gear so that the rev's are above 2000 I don't have any vibration, but if the rev's fall to say 1500 in 3rd, 4th or 5th and I accelerate I get the bad vibration.

Mark......

 

[MrE3]

4th gear takes me from 40 mph to about 60 , i might toodle along at idle revs in a row of traffic on a flat road in 4th at 30mph but a hill will make it judder and want to stall so i change down .

KZJ90

That sounds like it Shayne, is the KZJ70 taller geared than the LJ70? also how accurate are the rev counters? What is it that causes the judder?

Mark..

 

[Shayne]

The judder is just the engine struggling with the demand on it , the rev counter should be bang on the money . Don't nurse these engines they like to be revved hard drive it like you stole it but watch the temperature gauge when it goes into the red its already boiling . An aftermarket temp gauge is advised because toyota's own are rubbish .

 

[Rich Sims]

worth checking your engine mounts and gearbox mount

 

[StarCruiser]

Sounds like labouring the engine (now I've read your post properly and Shayne's reply has made me think about it). I often drive in 3rd at 30mph in Lynn's Space star as its just happier being in its power band than a smidge off idle.

If everything's been renewed then I reckon Shayne's right, what with the taller gearing (if you pardon the pun) that the tyres give you.