Perkins New 1000 Series, Workshop Manual, Page: 136 / 290

16
136 Workshop Manual, TPD 1350, issue 3
New 1000 Series
Cylinder bore, engine types AR and AS
To inspect 16-5
To ensure the best performance during the life of the
engine it is important that worn or damaged cylinder
bores are corrected.
The condition of a cylinder bore is decided by:
! The amount and location of any polished areas.
! Wear.
! Damage to the cylinder wall.
Note: It will not be necessary to correct the bore if:
! The honed finish can still be clearly seen.
! The engine performance and oil consumption is
acceptable.
1 Inspect the surface of the cylinder bore for cracks
and deep scratches.
2 Check the bore wall for areas where the honed
finish has been polished away. Check especially the
area around the top of the liner bore just below the
carbon ring. In this area, thrust from the top piston ring
is at its maximum.
Cautions:
! Do not use "Flex-hone" to repair cylinder bores.
! An engine can have high oil consumption with very
little wear of the cylinder bores, if the surfaces of
the bores are glazed.
! Specialist training and equipment is needed to
machine the finish of a cylinder bore.
If necessary, the cylinder bores can be bored and
honed 0,50 mm (0.0197 in) and 1,00 mm (0.0394 in)
oversize in diameter and oversize pistons fitted.
To obtain oversize cylinder bores they must be bored
and then diamond honed, silicon carbide base honed
and silicon carbide plateau honed to the finished size
to conform to the dimensions in the data and
dimensions at the end of this section. Specialist
training and equipment is needed to machine a
cylinder bore. For further information contact your
nearest Perkins distributor.
Purchased from www.WorkshopManuals.co.uk