The brief
The Golf had picked up unusual vibrations through the cabin, the engine moving more than it should, and thumping noises while driving. Those are the signs of worn engine mountings. The engine and gearbox sit on rubber mounts that stabilise the drivetrain and dampen its vibrations. As the rubber ages it sags and cracks, and once it does the drivetrain can move around more than it's meant to. That extra movement is the vibration coming through, the thump as it rocks on its mounts over bumps and gear changes, and the harsher engine note as the shake transmits straight into the body. Mounts that have all sagged together produce exactly that, and left unattended they let the drivetrain knock about and stress surrounding components.
The diagnosis
On the lift each mount got a pry-test. The engine mount and the gearbox mount had sunk visibly with cracked rubber, and the lower torque link had play in its bushes. All of the drivetrain mounts were tired at the same time. When they go together like that, you do them as a set, fitting one fresh mount next to a sagging one just loads the new one harder, so the call was the full set.
The work
The engine and gearbox were taken onto transmission jacks to take their weight, and each tired mount came off in turn, the engine mount, the gearbox mount and the lower torque link. New genuine VW-spec parts went in across the set, every fastener torqued to the manual figures. With everything bolted up, the drivetrain was checked to be sitting square in the bay before the engine was let down to load onto the fresh mounts. A road test confirmed the shake, the thump and the harshness were all gone.
The outcome
Smooth at idle, no thump over bumps or on shifts, no vibration through the cabin, and the engine note back to normal. The Golf went home with the drivetrain held properly again. Engine mounts wear as a set and they take the rest of the drivetrain's refinement down with them, so doing the whole set together resets the lot rather than chasing the next sagging one a few months later.
