This advise is related to all W110, W111, W112, W108, W109 &W113
Lifting a W110, W111, W108 or W109 chassis vehicle on a 2 post hoist can
lead to failure of the front suspension cross member mounts. When
you lift the car with the front wheels hanging in space the entire weight
of the engine/transmission and front suspension is supported by the front
subframe mounts (sometimes called tower mounts), the front shocks and the
flat spring at the front of the cross member. The pressure this puts on
the subframe mounts can tear the rubber away from the steel with the
result being that almost all the weight winds up being put on the shocks
and flat spring..
The other potential disaster for cars with a fan shroud is that if you
start the engine with it on a two post hoist the fan can fowl on the
shroud as the engine will drop anything up to 3-4cms.
To gain a better understanding of how this a problem, try lifting your
car on a 2 post hoist just a little bit (without the front wheels leaving
the ground) and look at how much the mounts stretch.
The pictures below show good (or new) mounts in green and bad ones in
red. They then go onto show how we solve the problem in our workshop. The
solution is rather simple.
1) With the vehicle sitting on the ground, weight supported on the front
subframe, remove the bolts that attach the subframe mount to the
subframe. These are accessed on the l/h side of a RHD vehicle by
removing the battery.
2) Place a 100mm x 80mm x 8mm steel plate with a 13mm hole drilled in the
centre over the four bolt heads for the bolts that hold the subframe
mount to the body.
3) Place a 130mm M12 high tensile bolt though the plate and screw it into
the subframe. Tighten the bolt until the mount is just being compressed,
you will have to look under the guard to see this.
4) Lift the car on a two post hoist. The weight of the front subframe and
engine is now suspended on the bolts. The vehicle can be driven on a
limited basis with these mounts in place, but obviously common sense
should be observed.