E28 / E34 5-Series

1981-1996 / Sedan / Germany

All E28 / E34 5-Series problems All workshop issues

Critical Drivetrain

11. Guibo (Flex Disc) Deterioration

Symptoms

Vibration through the drivetrain at low speed. A rhythmic clunk when accelerating from a stop or decelerating. In extreme cases, a visible crack or tear in the rubber disc when inspected from underneath.

Cause

The guibo is a six-armed rubber coupling between the gearbox output and the driveshaft. It absorbs shock loads and accommodates minor misalignment. After 25-40 years, the rubber degrades, cracks, and eventually separates. A failed guibo disconnects the driveshaft from the gearbox.

Fix

Replace the guibo and the associated bolts (which are stretch-to-yield and must not be reused).

Parts: $60-120 for the guibo, $20-30 for bolt set.

Labour: 1-2 hours.

This is a straightforward job on a hoist.

Inspect the centre support bearing at the same time, it's accessible and cheap ($80-150) and often worn when the guibo is worn.

Cost mentioned in fix

$60-120 for the guibo$20-30 for bolt$80-150

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// More E28 / E34 5-Series problems

Other known issues

Common Drivetrain

12. Differential Bushings (Both Generations)

A pronounced clunk from the rear when changing between acceleration and deceleration, or when pulling away from a stop. The clunk is felt through the floor and is distinct from suspension noise.

Critical Engine, M30 (E28 535i, E34 535i)

1. Timing Chain and Tensioner Wear

Rattling from the front of the engine on cold startup, lasting several seconds until oil pressure builds. The rattle may also appear briefly when restarting a warm engine. In severe cases, a constant rattle or chain slap noise.

Critical Engine, M30 (E28 535i, E34 535i)

2. Oil Leaks (M30)

Oil weeping from the valve cover gasket, oil filter housing gasket, oil pan gasket, rear main seal, and front crank seal. Oil residue on the underside of the engine and on the exhaust manifold.

Common Engine, M50/M52 (E34 520i, 525i, 530i)

3. VANOS Seal Failure

Rattling from the front of the engine on startup, loss of power and torque below 3,000 rpm, rough idle, and in some cases a check engine light. The engine may feel flat and unresponsive at low RPM but pull normally above 4,000 rpm.

Minor Engine, M50/M52 (E34 520i, 525i, 530i)

4. M60 V8 Nikasil Bore Wear (E34 530i, 540i)

Progressively worsening cold-start difficulty, rough idle when cold that smooths out as the engine warms, increasing oil consumption (more than 1L per 1,000 km), and eventually misfiring and low compression.

Minor Cooling System (Both Generations)

5. Expansion Tank Failure

The expansion tank cracks without warning, dumping coolant. The engine overheats rapidly, often within 5 minutes of the leak starting. The crack typically occurs on the side of the tank or at the plastic seam. On the E34, the tank is mounted on the left inner wing; on the E28, it's on the right.

View all 14 E28 / E34 5-Series problems