CYLINDER BLOCK AND LlNERS-G.2 G3 G4 suitably marked so that they may be refitted to their original parent bore and in the same position in that bore, that is, thrust side of the liner to the thrust side of the cylinder block. where difficulty is experienced, then the use of BARSEAL in the cooling system (in accordance with the manu- facturers instructions) is approved. Oversize Cylinder liners To Renew Cylinder liners Oversize outside diameter cylinder liners are available for service use on 4.108 engines, if the standard parent bore has been made larger to remove damage.
Oversize Description 0.010 in (0,25 mm) Cast Iron Flangeless Bore & hone Where a parent bore is made larger in service, it should be machined to the dimension by adding 0.010 in (0,25 mm) to the standard parent bore diameter given on Page B.3. A chamfer must be machined at the top of the new parent bore. When oversize liners are fitted at the factory, the liner oversize is stamped on the top face of the cylinder block between the liner and the edge of the cylinder block. Remove all components from cylinder block. Remove liners using a suitable liner removing tool (see Fig. G.4). Once the liner has cleared the rubber sealing rings in the cylinder block, the liner can be removed by hand.
Remove any corrosion and burrs which may be present at the inner ends of the landings. Renew the rubber sealing rings in the grooves at the bottom lands. To ease fitting of the liners when the rings have been placed in position, smear the liners with soft soap or soapy water. Place liner in position and press home by hand, ensur- ing that the rubber sealing rings remain in their grooves (see Fig. G.5). The liners are a push fit and no force is required. After fitting the liners, the cylinder block should be water tested at a pressure of 20 Ibflin 2 (1,4 kgflcm2). Re-assemble engine as required and to instructions given for the various components. Note:
If engine is overheated, it could have an adverse affect on the liner sealing rings. All 4.107 and later 4.99 engines have four small holes drilled along the fuel pump side of the cylinder block, each one breaking through into the area between the two sealing rings at the bottom of each cylinder liner. These holes permit any coolant which may have leaked past the upper sealing ring to escape thus relieving the botiom sealing ring of any pressure above it and preventing coolant from entering the engine sump. In the case of a new engine, or where cylinder liners and/or sealing rings have been fitted, it is possible that a slight leakage of coolant could occur from these holes.
This should ease as the liners and sealing rings settle down after the initial period of running, but G5