Sealey DZRE92/C - Manual (Page 2)

CHASSIS DAmAGE.
chassis damaged can usually be grouped into five categories described as follows: sAG, sWAY, KIcK-uP, DIAMonD and tWIst.
Despite there being many differing designs of frames (i.e. ladder, offset, X-type etc) collision impact will distort the frame or parts of it
regardless of construction.
NOTE:
A chassis may sustain more than one type of damage i.e. sAG and KIcK-uP. In addition to other types of damage some cases of front end
damage, the cross member or engine mounting may roll under.
3.1. CHASSIS SAG
Vehicle having sustained a front or rear impact. the frame can sag
looking like a “hammock” similar to the side view in figure 3.
3.2. SWAY
Vehicle sustaining an impact in the side, middle, or, at the end of a side
will normally distort resembling a sway as in figures 4 & 5 top views.
3.3. KICK-UP
Vehicle bumper impacts will damage only a part of the frame, which will
“kick-up as in figure 6 side view. A unitised body is however more likely
to sAG, there being one major bend in the floor pan.
3.4. DIAmOND
common in parallel side rail frames, where a corner impact may push the
alignment out of square as in the figure 7 top view.
note: It is un-common for Hour Glass, unitised, or X-type frames to
diamond.
3.5 TWIST
Vehicles which suffer an incline impact, such as a ditch or a severe curb
impact, may result in the chassis twisting as in figure 8 side view.
fig 3
fig 6
fig 8
fig 4
fig 7
fig 5
3.6. PREPARING FRAmE FOR STRAIGHTENING.

WARNING! Ensure health & safety, local authority, and general workshop practice regulations are adhered to when preparing vehicles.
In principle the straightener is used to exert force in the reverse direction from that of the collision impact. After having determined the extent
of damage and taken all measurements, note the direction of the impact, and then plan your pull. In order to gain good access and vision the
task will be made easier by removing any interfering parts or sheet metal (i.e. wheels, bumpers, grills etc). Parts that are un-repairable and are
to be replaced, must be removed first. In front end damage it may be necessary to remove the upper or lower control arms, sway bars etc, to
eliminate excessive spring back.
Where major body damage has been sustained, rough out the body metal first. DO NOT remove body bolts unless absolutely necessary.
Accomplish as much body roughing out as you are able while working on the frame. If possible, correct any body damage in unison with frame
straightening as this will save time and effort by making it easier to align the body with the frame.
the frame and body should always be over corrected to allow for spring-back. Hammering or heating the metal will help relieve body and
frame stress and lessen the spring-back.
When there is no clearance between the frame and the body, the vehicle floor may be pried up to allow anchoring of the chain, or an opening
made in the floor that can later be welded shut. A preferable method is to weld a tab onto the frame from which pulls can then be made. the
tab may later be removed.
When repairs require the additional use of a jack, ensure the jack is of the appropriate type and capacity, is in good condition and that you
follow any instructions relating to the jack. spread jack loads to avoid structural collapse, by using a steel plate between the jack and the car
frame. Blocks may be inserted inside “channel-type” frames to prevent the bottom flange from being crushed, a wooden block should be
placed between the jack and the main beam for stability. DO NOT use if the jack or any jacking point is unstable, and ensure the jack is
centred correctly.
and safe to do so) for a thorough inspection. the technician will check all parts and determine if there is any broken, torn, crumpled, wrinkled,
crushed, twisted or bent metallic parts. If there is, then the chassis may be damaged and require straightening. Measurements should be
taken to see how far alignment may be out. It is important to determine correct dimensions by referring to the manufacturers frame dimension
charts and specifications. remember, do not commence pulling until you are sure when to stop. take time to examine and determine damage
correctly. comprehensive planning will save you time when you are actually using this equipment.
Original Language Version
DZrE92/c.V2 Issue: 1 - 01/07/13 © Jack sealey Limited