Lotus 2004 ELISE Service Notes page 22

Lotus Service Notes
AH.2 - CHASSIS STRAIGHTNESS CHECK
In the absence of visual damage, the chassis may be checked for twist or distortion by utilising the tooling
holes in the underside of the main side rails. If computer processed laser measuring equipment is not avail-
able, manual checks can be made with reference to an accurately level ground plane, e.g. an accurately set
and maintained suspension geometry ramp/lift. Position the car on the lift, and proceed as follows:
1. Identify the tooling holes in the lower surface of each chassis main side rail. At the front end, between the
suspension wishbone pivots, and at the extreme rear end of each rail.
2. Measure the height of each tooling hole above the reference plane and use jacks to adjust the height of
the chassis in order to equalise any three of these dimensions.
3. Measure the deviation of the fourth dimension from the other three.
Maximum service deviation = ± 2.0 mm.
4. Repeat operations (2) and (3) for each combination of corners to result in four values for the 'fourth' dimen-
sion deviation. If any one of these exceeds the service specification, the chassis should be considered
damaged and replaced by a partial body assembly.
FRONT
Front wishbone
Page 4
sn_ah_cyclone.indd 4
Tooling hole
Section AH
REAR
Tooling
hole
Rear wishbone
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