Service Manual
Page 19 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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Drop the chain through the chain case retaining it at the top end by, for instance, looping a length of string through the chain and around the frame. Position the sprocket-gear assembly into the loop at the end of the chain.
Fit the pivot pin into its bearings and position the thrust washer on the inside end of the pin. The chamfer on the inner diameter of the thrust washer goes against the shoulder of the pin. The pin may now be pushed into the crankcase bore with the outer flat facing rearwards. Each pivot pin carries a thrust washer on both ends; all four washers are identical.
Either chain and sprocket assembly may be fitted independently of the other; it is more convenient to fit these parts before the crankshaft helical gear is fitted. It is not necessary to time the gears when assembling these parts. Refit the crankshaft pinion which is retained by a right hand threaded nut (32mm spanner), page 16.
When all three helical gears are in place, refit the oil pump gear and the two outer thrust washers, (chamfer on the inner diameter against the shoulder on the pin). The timing plate may now be fitted using Loctite screw-lock on the three button headed screws, (5mm. Allen key). Refit the camshafts and the cam sprockets (page 18). If the timing nears at the camshaft end have been disturbed, it will be necessary to retime each camshaft individually on reassembly (pages 23-24) rather than relying on the sprocket carrier parts having been removed as complete assemblies.

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