Service Manual
Page 20 of 50

*NOTE* This service manual is for a NON EN10 modified engine. Whilst most of the information is relevent, there are some critical differences.
For more information on EN10 modified engines, please contact
Mick Broom at Broom Development Engineering on +44 (0)1327 353023

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VALVE CLEARANCE. Inlet 0.10 - 0.15. Exhaust 0.1 5 - 0.2 0mm The front cylinder can be attended to with to petrol tank and air filters in place, but for t: rear cylinder these parts should be removed.
Position the engine so that one piston is at TDC on the firing stroke, (i.e. with the reluctor in line with the pick-up as shown).
Remove both valve covers from the cylinder head (7 screws in each, 4mm Allen key) and measure the clearance between each cam and cam follower. Record the largest metric feeler gauge which can be inserted between the cam and follower. If this figure is 0.10mm for both inlet valves, and 0.15 mm for both exhaust valves, no attention is necessary. If any clearance reading is greater or less than the correct figure, the camshaft must be removed, (pages 21-22). Should no clearance be present at all, so that no endfloat can be detected by finger pressure on the camshaft, it is possible that damage to the valves or seats has occurred. In this ease it is recommended that the cylinder head should be removed for examination of these parts, (pages 27-29). If the lack of clearance is due simply to a mistake in shimming the valves, and the engine has not run for more than a few minutes, no damage should have been caused. To confirm this, a compression check should be made when the correct clearance has been obtained. Both cylinders should show similar readings of 10 bars minimum (150 psi) at cranking speeds. The valve clearances may of course be set on a detached cylinder head before refitting to the engine.

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