[ Subframe bushes ]
It can be a fiddly job but replacing worn out front subframe bushes can improve your Mini’s handling and reduce the risk of failures elsewhere. Words and photos: Jim Jupp
Replacing front subframe bushes
T
he front subframe bushes on our project, Mini Sheldon, were squeaking when downward force was applied to the slam panel. The subframe fitted is a dry (post-Hydrolastic) 1976-on one. Replacing them is a job I put off for a while because it’s a bit tricky but, as with most Mini jobs, once you get stuck in it’s not that complicated. What will make the process easier is a helping hand but it is possible to complete this job on your own as long as you take care. The [1976-on] front teardrop bushes seem to be the most stubborn to replace but these were clearly the failure point in this case, going by the direction of the noise. There is a large variety of bush and mount options available when it comes to replacing front subframe bushes for 1976-on dry front subframes, as we have here in this 1990 Mini with replacement BMH shell. This type of subframe can be identified by the two large upper tower bolts that connect the subframe to the bulkhead and are visible either side of the bulkhead. The earlier versions had four long 5⁄16” bolts [or studs] through the bulkhead. There are roughly three types of replacement bushes but people mix and match them for a number of reasons: solid mounts are mainly used on racing cars or when carrying out
RetroSport billet alloy front subframe rear mounts
44 March 2022 MiniWorld
Top and front teardrop polyurethane subframe bushes from Mini Mine were chosen to replace the OE ones last fitted.
bodywork (for improved panel alignment), polyurethane offers a stiffer, more-responsive ride and, finally, OEspecification rubber. The later type of front subframe has six bushes/ mounting points, with the rear lower mounts (21A2599) comprising two metal plates bonded together with rubber. This was a new addition in 1976, to reduce noise, as earlier front subframes bolted directly to the front bulkhead. 1976 also saw the introduction of a fixing strap, visible from the interior, which can now be replaced with a stainless steel equivalent
Smiffy's Bits stainless steel front subframe rear mount strap.
