Symptoms
Vibration at idle, a visibly wobbling crank pulley, rattle or chirp that changes with RPM, cracked or bulging rubber, belt squeal. Don’t keep driving it: if the outer ring lets go you lose power steering, charging and the water pump.
The fix, step by step
- Remove the belt and fan as needed, hold the crank pulley with a counter-hold tool, and break the 27 mm centre bolt loose.
- Fit the new balancer with a new front crank seal while you're there; a new centre bolt (112 031 00 71, M16 × 1.5) is cheap insurance.
- MercedesMedic's M112/M113 guide gives the bolt torque as 200 Nm plus a further quarter turn (90°) — confirm against WIS for your engine.
Tools & part numbers
- Crank pulley counter-hold tool (e.g. CTA 7270)
- 27 mm socket
- long breaker bar or high-torque impact
- centre bolt 112 031 00 71
- front crank seal
- balancer (match the part number by VIN)
Where to buy the parts
Corteco harmonic balancer / crank pulley 112 035 14 00 (M112/M113)FCP Euro ↗Amazon ↗
Corteco front crankshaft seal 023 997 84 47FCP Euro ↗Amazon ↗
CTA crank pulley counterhold tool 7270FCP Euro ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Mercedes-Benz G 500 parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.