540i Engine Shudder/Vibrations

[632 Regal]

sounds like a great way of getting into the darwin awards for 06

So while you are in Drive, with the hood open, have a friend stand on the fender of the car while you accelerate at full throttle?

[BillionPa]

haha thats awesome fetch, i would love to see somebody do that.... as long as they didnt get smashed to bits.

the only way you would want to do the shake test on an M60 engine automatic is by putting it on a dyno.

there is a technical service bulletin in regards to failing valve bodies in the transmission, as they attempt to compensate for something that isnt going to happen (since the car is in neutral)

and dont jack the car up and run it like that, as its very bad for the rear CV joints, and the change in rotating mass can cause the car to push the jacks around.

[mattyb]

engine mounts are not hard at all, same for tranny mounts.

[stargazer_61]

aaaaaaaaaaaaaaaaaaaactually....

if you have an automatic, dont rev it in park or neutral, as this can cause catostrophic damage to the transmission.

Wellllll.........

I didn't mean it like he was going to let it rev for a half-hour or something. Just to see if the engine rocks in the bay.

[Vanguard]

if you have an automatic, dont rev it in park or neutral, as this can cause catostrophic damage to the transmission.

Why would this cause transmission damage?

[632 Regal]

because the drums arent drilled to release the fluid and when you spin it up in neutral or park all the clutches engage and *Poof*

Why would this cause transmission damage?

[Vanguard]

Good to know. Thanks.

[chiefcorey]

It seems the consensus is that this is a result of the Engine/transmission mounts.
I'll get them replaced tell you all what happened. Thanks!!!!

[genphreak]

Good to know. Thanks.

Check the rear end too. Whenever engine mounts go it can be 2 root causes;

1) Wear
2) Abuse
or heh, Wear and abuse

Now be sure to check the rear end and drive train. Do you know that some hat wearing kid hasn't taken it drifting? If it's possible, next time you jack up the rear and check out all the mounts for cracking or damage. Look for bits of rubber apat around into crannies within the wheel arches...

Theoretically you could be up for centre bearing, (guibo if it has one), rear subframe mounts and shock mounts when you next do the shocks.

Nick

[BIGRED]

Our varying engine vibration was caused most likely by the fan or fan clutch. I say most likely because I changed the fan, the clutch, belt tension pulley's and shocks.

To track it down I started up the engine (when it was dead cold) without the fan or belt on and there was zero vibration (total run time 10 seconds)

I lean towards the fan or the clutch because it makes sense to me that as the temp changes the fan would act differently.

Perfectly smooth now.

Good luck
Don