PISTONS AND CONNECTING RODS—F.4Fig. F.7.Checking Piston Height In relation to Cylinder BlockTop Facethe piston and rod numbers relate to the cylinderinto which they are being fitted. Ensure that withthe rod identification number opposite to thecamshaft, the word "Front" marked on the pistoncrown is towards the front of the engine. If not,remove the piston from the connecting rod and refitcorrectly as previously detailed.3.Turn the crankshaft until the appropriate crankpinis at bottom center, draw the connecting rod to thebearing shell, locating it in the tag slot.4.Refit the other correct half bearing shell to the cap,again locating it in the tag slot, and refit the cap andbearing shell ensuring that the numbers stampedon the rod and cap coincide. Refit the twoconnecting rod bolts with the flat on the head ofeach bolt located against the milled shoulder on therod. Secure with two new nuts to a torque wrenchsetting as given on Page B.1.5.Refit the lubricating oil sump (see Page L.5).6.Refit the cylinder head (see Page E.6).Fitting New PistonsWhen fitting new pistons it is essential to see that thepiston and connecting rod are assembled correctlybefore fitting them to the engine, see "To Assemble thePistons and Rings to the Connecting Rod."Ensure that genuine Perkins parts are used, so thatthe new piston height will, when assembled, in theengine, comply with the tolerances as listed in"Technical Data" - Page B.2.NOTE: As from Engine Nos. 236U135765 and236U147150L, the pistons must be topped tothe correct height above the cylinder blockface as given on page B.2.
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