SECTION G
Cylinder Block and Liners
Fig. G.1.
Exploded view of Cylinder Block Assembly.
To Renew Bush in No. 1 Camshaft Bore
Current 4.236 marine engines have a bush fitted into
No. 1 camshaft bore in the cylinder block.
A prefinished bush is available to replace a worn bush.
The worn bush may be extracted and replaced by a
new one. making sure that the oil holes in the bush and
cylinder block correspond.
CYLINDER LINERS
Cast iron interference fit dry liners are fitted to the
4.236 marine engine. These liners may be rebored to
0.030 in (0.76 mm) oversize, but during this operation it
is most important to ensure that the true alignment of the
bores relative to the crankshaft axis is maintained.
To Renew Cylinder Liners
1.
Remove all engine components from the cylinder
block (see appropriate sections for removal of
these).
2.
Remove the cylinder head studs from the cylinder
block.
3.
The liners are pressed out through the top of the
cylinder block using a shouldered metal disc slightly
smaller on the outside diameter than the parent
bore size. Ensure that no damage is caused to the
parent bore.
4.
Ensure that the cylinder bores are perfect, clean
and free from burrs etc.
5.
Thoroughly wash oil any grease etc. from the new
liner with cleaning fluid, and dry thoroughly. When
fitting replacement liners ensure that the correct
type is used.
6.
Lubricate the outside diameters of the liner with
clean oil and press them in until 0.028 0.035 in
(0,71/0,89 mm) of the liner Is protruding above the
cylinder block face. Shin washers or a solid stop
washer 0.028 0.035 in (0,71/0,89 mm) thick should
be used when pressing the liners into the cylinder
block In order to give the necessary protrusion
Fig. G.2.
Dimensional check of Cylinder Bore
