Engine Construction; Notes When Applying An Electric Starter - O.S. engine MAX-25XZ Instruction Manual

ENGINE CONSTRUCTION

With this engine, the piston will
feel tight at the top of its stroke
(TDC) when the engine is cold.
This is normal. The cylinder bore
has a slight taper. The piston
and cylinder are designed to
achieve a perfect
clearance when they
operating temperature.
NOTES WHEN APPLYING
AN ELECTRIC STARTER
Do not over-prime. This could
cause a hydraulic lock and damage
the engine on application of the
electric starter.
If over-primed, remove glowplug,
close needle-valve
starter to pump out surplus fuel.
Cover the head with a rag to
prevent any pumped out fuel from
getting into your eyes.
Cylinder Liner
Crankshaft
running
Slight taper
reach
When the engine is cold.
6
and apply
7
Near TDC
Piston
When the engine is hot.