goody90q45 wrote: ↑
Mon Feb 11, 2019 6:44 pm
The 3rd engine mount, AKA transmission mount, will put out a vibration in this rpm range when they start wearing out. It's an easy repair but a replacement part may or may not be available.
Words of wisdom - Replace the rear transmission mount - I just did so on my 1992, and it completely eliminated a nasty shudder that happened when engine RPM hit 1900. The shudder itself seem to be 10-15 Hz, some subharmonic. The car is much smoother & more comfortable.
I never suspected the mount, but it eliminates the trembling, this is what I installed: //www.rockauto.com/en/catalog/infiniti,19 ... mount,8616
In my case, the shudder appeared only after putting the car back on the road after a 4 year period of sitting up. The old part appeared to be sagging, and the rubber webbing was partially cracked.
So hats off Mike, it makes a really nice difference.
I have a slight ATF leak, which I suspected was the transmission tail shaft seal, but the shaft and housing are totally dry, though the connector cluster at the tail shaft are dripping, so I think connectors are the source of the leak. Each time I raise the front of the car for service, while leaving rear wheels on the ground, ATF drips from the connector cluster. It's not a major problem, but I hate the smell of burning motor oil. Has anyone fixed this, or know how the connectors seal?
I also found one of the exhaust mounts that bolt to the transmission cross member is sheared, so if I can locate a replacement, that is next. Good week, all!