All engines have harmonic balancers, it is simply the heavy cast pulley
attached opposite the flywheel end of the engine.  These pulleys usually
have a rubber filled bonded area between the pulley side and the hub
side, and between the weight and the flexibility of this joint natural
engine vibrations are smoothed out somewhat.

When in-line four engines go beyond 2000 cc displacement natural
vibrations tend to increase dramatically, and internal counter rotating
shafts or other exotic methods are used to dampen them.

Any in line 2000cc four cylinder engine is going to vibrate at 3500-4000
rpm.  Just check the mounts, exhaust, etc. for possible resonant
vibrations.  You might also have the front pulley, clutch and flywheel
balanced next time you have the engine out.
--
Stuart MacMillan
Manager, Case Program
800-909-8244 ext 208

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