Pajero 2003 3.5 vibrating at 2300rpm

I have no pics, but these two threads should help you a great deal.

Exploroz - Pajero vibration

Pajero Club - V6 vibration problem

The source of the problem is that all 90 deg V6's without balance shafts, have an inherent harmonic 1st order balance problem.
This has been known since V6's were first built. I can recall the V6 Ford Capri (built '68 to '86) had a harmonic balance problem with the engine at 3000RPM.

Mitsubishi appear to have taken the cheap way out by fitting a harmonic balancer to the output driveshaft on the transfer case.

Many V6 Pajero owners speak of curing the problem by removing the driveshaft "counterweight".
This harmonic balancer apparently has no major benefit - and the vibration problem becomes worse with age.
Mitsubishi apparently removed the drivetrain balancer after 2007.

It's likely they also altered the design or material in the gearbox mountings at the same time, possibly finding that an improved type of mounting eliminated the need for the drivetrain balancer.

Part of your problem would be related to aged and softened gearbox and engine mountings, which you would be well-advised to replace for a start.

It would also pay to check the condition of the harmonic balancer/pulley on the front of the crankshaft of the engine.
Even just front pulley groove wear, may be enough to upset the engine balance at critical engine speeds.

Cheers, Ron.

Having owned one of these units I encountered the exact problem as you have.
after countless tests and trials of different things including wheel bearings etc. it was found to be the driveshaft, as mine was composite fibreglass.
replaced it and problem was sorted.
enquiry to Mitsubishi on a replacement unit blew me out of the water, so after a few more enquiries I found that bearing supply people are able to supply them and substantially cheaper
cheers
Flighty

I had a transmission problem on my 2002 Pajero under warranty. Eventually I was dealing with Mitshbishi and they sent me to Fluidrive. I was puzzled but they said fluidrive do their complex fixes. Maybe they can help if its transmission related.

Hi ,
90deg v6 have the most problems
Most Japanese v6 engines are not as above but many are 60deg
This improves vibration some what but being a v6 its still afflicted by vibes .
V6 engines have not been a popular choice by car makers for this very reason . The vibes pushed the development of v6 and balance shafts . Amazing that some makes use them more than others !!!
Factory engine balancing is typically rubbish eg big tolerances and does contribute to the vibe issue.

Some makers even use strut bracing to stop/ absorb engine vibration. As u guessed made no noticeable difference !!!

The product below is an excellent cure for any rotating component suffering from vibration problems.

You can fit these devices to virtually anything you can bolt them to.

They can be fitted to aircraft propellors, engines, driveshafts, wheels - the list is endless.

They are particularly good at dampening vibration which occurs at altering frequencies over a range of speeds, because they have the inbuilt ability to actively respond to varying imbalance conditions.

NNF - You might consider fitting one of these to your Pajero driveshaft, in place of the factory balancer - as the factory balancer is obviously very limited in its balancing ability.

BalanceMasters - Active Balancing System

Cheers, Ron.