Engine

Help and Instructions

• Engine Help

  easy engine identification points, but beware as some parts become interchanged over the years.
  8 HP models: 13 head studs, hole for starter motor approx 51mm diameter.
  8hp 'narrow block' early model Y, width approx 135mm, cylinder bore 2.23 ins (56.6mm), fibre gear driven camshaft, two water inlet holes in block.
  8hp model Y, width approx 138mm, otherwise as above.
  8hp model (37 on) chain driven camshaft, single water inlet hole in side of block.
  10 HP models: 13 head studs, hole for starter motor approx 70mm diameter.
  10hp model C, cylinder bore 2.5 ins (63.5mm), fibre gear driven camshaft, two water inlet holes in block.
  10hp model (37 on) chain driven camshaft, single water inlet hole in side of block.
  100E model: 14 head bolts
  cylinder bore 2.5" (63.5mm).

  full details are available in our technical manuals