What can transfer vibrations

frebor72 · Post by **frebor72** » 11 Oct 2020, 13:27

There are five engine mounts total? Right? But what other components can transfer vibrations from engine to chassi? I feel enginge vibrations through the floor and it’s gradually getting worse. Speed has no effect, only engine rpm. Based on that I ruled out drive shafts, tires, brakes, wheel bearings etc

So please make this list as complete as possible

Upper mount
Lower front mount
Lower right mount
Two main engine mounts
...

Post by **oragex** » 11 Oct 2020, 13:43

Zero vibration in the steering ?
I would say unbalanced rear wheels or the two main engine mounts - especially on the diesel engine (vacuum mounts)
May also look at the mount near the crank pulley but only if really collapsed www.youtube.com/watch?v=y4nvecLGeOU

frebor72 · Post by **frebor72** » 11 Oct 2020, 13:48

I ruled out rear wheels because it’s not speed related. More like worse at around 1800rpm

Main engine mounts are not replaced yet.

Post by **SuperHerman** » 11 Oct 2020, 20:06

Possible torque converter - maybe solenoid that controls the same.

What happens when you put it in neutral at speed?

frebor72 · Post by **frebor72** » 12 Oct 2020, 01:08

It’s a manual car. But in neutral with speed the problem disappears.

Post by **SuperHerman** » 12 Oct 2020, 13:26

Well it sounds like your transmission is the issue as the sound disappears when not under load.

Could be end of life for clutch, pilot bearing and related components - or maybe a had part failure internally.

Have you checked your transmission fluid level? Signs of any leaks? Maybe pull the drain plug and check the magnet for excessive metal deposits - could be a hard part failing internally. If you find excessive metal - this will be a clue as well as fluid condition.

I am not familiar with Volvo manual transmissions, but they are fundamentally the same as the rest of the designs.

frebor72 · Post by **frebor72** » 12 Oct 2020, 13:35

Not the desired answer of course but ok. If the gearbox is at the end of it’s life I think the car is also. By the way, will an exhaust leak be felt in the chassi?

Post by **oragex** » 12 Oct 2020, 15:30

FWD ? Original clutch ?

frebor72 · Post by **frebor72** » 12 Oct 2020, 23:32

Post by **abscate** » 13 Oct 2020, 03:55

Exhaust can definitely cause vibrations in the body. A hole will usually be audible, but a loose mount of rubber buffer won’t make noise.