SUNBEAM S7 and S8 TWINS
  • SUNBEAM MOTORCYCLES. HEADER PAGE.
  • SUNBEAM NEWS and START PAGE
  • About the bike.
  • Distributor Internals
  • Redundant spark ignition.
  • Coil Information.
  • Beam-Spark Ignition Unit
  • FOR SALE
  • Smiths Chronometric Speedometer
  • Calibrating Smiths Chronometric Speedometer.
  • Speedometer Drives.
  • Companies and Products.
  • My other bikes.
  • The Horn. and Rear Brake Spring.
  • HOW TO PAGE
  • Modifications Page One
  • Modifications Page Two
  • Modifications Page Three
  • Dipsticks,sumps and oil weirs.
  • The Electrics
  • Sunbeam Dynamo in depth.
  • Repairs and Maintenance.
  • Carburettors
  • S8 Front forks.
  • Full width front brake on the S8.
  • Top dead centre.
  • Your Sunbeam.
  • All things wheels.
  • Data Sheets.
  • Engine breathing and oil leaks.
  • Putting the engine together.
  • Stainless Steel Exhaust
  • Tools
  • All things final drive
  • I80 Degree Crankshaft
  • Completed engine speed ignition sytem.

Finding Top Dead Centre.
I assembled the engine block of the Sunbeam including the flywheel. I had scribed a line on the flywheel where the original TDC mark was.
I used a dial gauge on a magnetic stand which stuck to the iron cylinder liner. The photo below shows the setup used on another engine to find top dead centre of a cam lobe. This setup was used to find the top dead centre of the pistons on the Sunbeam.

The scribed line was used as the reference point to mark a dot on the steel backplate. I used a small battery powered engraving tool to make the 'dot'. This makes finding top dead centre for timing the distributor a bit more accurate. I use a mirror ( see photo ) but I was thinking maybe a USB camera connected to a laptop could give a more accurate view of the flywheel marks.


Picture
Picture

Mirror showing reverse flwheel markings.

Picture

Scribed line and dot ( reversed view ).

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