Lotus Elise S1 Service Notes page 23

Lotus Service Notes Section TDL
AF.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 available,
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
REAR
Tooling
hole
Tooling
hole
Front wishbone
Rear wishbone
m
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