I’d say a stone has become lodged hard against an engine mount or more commonly a gearbox mount
Remove the rear mount for the gearbox and the stone often falls out
It will be jammed in there exceedingly well and well hidden
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I’d say a stone has become lodged hard against an engine mount or more commonly a gearbox mount
Remove the rear mount for the gearbox and the stone often falls out
It will be jammed in there exceedingly well and well hidden
Yep - that's a likely source. That and the rubber element that's bonded into the mount has compressed and gone hard - what normally happens with the rubber elements is they are really good across the range of RPM but at certain areas they will transmit like a drum. This is usually at lower RPM levels as well like idle - really inconvenient! I built a hardened set for the ranger manual after I broke the control element in three factory sets which was allowing quite a lot of movement - so much that the loom was getting wiggled and giving limp mode errors. The first version I tried used soft nolathane material instead of rubber - awesome at RPM and really stable in terms of engine motion but man, loud at idle the noise just transferred straight through.
The next set, I added a plastic tube to the central pin of each mounting to limit the movement to about 10mm in any direction and then filled the gap with EPDM rubber discs - this was much more pleasant and effective across the RPM range. This is just an example of how sensitive vibration transfer through a mounting can be and the rubber elements don't last forever (noting it's a 2002 vintage vehicle). A stone or something jammed somewhere can do the same thing.
I dunno about the flywheel - had a few of them go bad but from what I've found usually the vibration get worse the higher you go. Having said that if it's a poxy dual mass one all bets are off and they can be an absolute nightmare to do anything with too! Most just throw them away and fit a traditional flywheel and put up with the extra harshness.