Disclaimer
The manual provides a guide to replacing the head gasket on a 1990 UK model Lotus Elan M100, but the author takes no responsibility for any work carried out on the car.
The Process
The process involves removing the bonnet, coolant header tank, and crankshaft bolt, followed by the alternator and PAS belts, and crank pulley. The cam belt covers and engine mounting beam are then removed, and the head gasket is replaced. The process also involves cleaning and replacing various components, such as the water pump, oil seals, and camshaft belt pulleys.
Technical Aspects
The manual highlights three critical technical aspects of the process: ensuring the cam belt tensioning pulley is rotated clockwise and locked in place, setting the relative positions of the crank pulley and cam pulleys correctly, and torquing all nuts and bolts correctly during reassembly.
The Investigation and Observations
The manual includes an investigation into the failed head gasket, which revealed oil leaks, damage to the gasket, and no signs of metal damage or cracking between cylinders.
Putting it Back Together
The manual provides a step-by-step guide to reassembling the engine, including fitting the new head gasket, cam cover, and water pump, and reconnecting various wires, pipes, and connectors.
Manual:
Download: Lotus Elan M100 1990 UK Model Head Gasket Change Manual
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