Floating Power motor mounts were used on Chrysler 300's in 1960, 1961, 1962, 1963 and 1964.
There were two distinct units available, depending on whether the car was a Long Wheelbase ( 300F and 300G ) or a Short Wheelbase ( 300H, 300J, and 300K )
Part numbers for the long wheelbase mounts are : 2128571 and 2128572
Part numbers for the short wheelbase mounts are : 2120237 and 2120238
Here's a picture of a pair of long wheelbase mounts ; they are "as installed" in car. The engine would fit between the two . On a long wheelbase car, the ears face forward.
These mounts are quite prone to failure: age has taken its toll, oil has dribbled down from the valve covers and soaked the rubber, and much horsepower and torque has been applied over years and years ! They start to develop cracks in the areas where metal is bonded to the rubber. Once a crack becomes visible, its only a matter of time until the mount fails .
Frankenmount to the Rescue
(or, how to repair you old tired mounts)
- First step, if the mount is already collapsed, is to line it back up again, so that all is where it should be...
Then, drill a hole straight thru the mount, as shown, front to back .
- Insert a piece of threaded rod all the way through the mount as shown.
- Cut the threaded rod so that the ends are just a bit recessed inside the mount
- Mig-weld the rod ends to the mount body ...
- Here's the weld, before grinding...
- ...and after grinding !
- A little paint, and you're all done. These suckers will never fall apart again !
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