PN 57.4400.0100_020115 - Genie

Section 13Connecting Rod Assembly700 SeriesOperation:Connecting rod - to check for bend and to inspect13.06Recommended torque:Engine type Nm lbf ft kgf m-Service operations:1. Remove piston assembly … … 13.022. Refit piston assembly … … … … 13.06Special notes:Caution: Do not use a letter stamp to mark the connecting rod.The new letter must be engraved onto the big-end of theconnecting rod.If the original piston is used, ensure that it is assembled to the correctconnecting rod and is used in the original cylinder.The top of the piston must not be machined to obtain the correct height.Note: The large and small end bores must be square and parallel with eachother within the limits of +/- 0,20 mm (0.0007 in) measured 130 mm (5.1 in)each side of the connecting rod axis on a test mandrel. See A.L ±0.20 mm(0.007 in)A130 mm(5.1 in)130 mm(5.1 in)To check the connecting rod for bendL ±0.20 mm(0.007 in)In service, initially, three pistons of different heights (High,Nominal and Low) were supplied and one connecting rod.The connecting rod was identified by an 'X' engraved ontothe side of the big-end. The small end bush was machinedconcentrically. This was later changed to three connectingrod lengths and one piston height.The crown of the piston is marked “std”. The small endbush is machined eccentrically. A concentric small endbush, part number 3112E008 can be obtained, which canbe fitted to the original connecting rod and then machinedto obtain the correct length grade, refer to operation 13.10.Connecting rod kits are also available with the small endbush fitted and machined to obtain the correct connectingrod grade, refer to the table below.Pistons with a larger diameter are also supplied, to be fitted if thecylinder bores are bored oversize. The single height grade alsoapplies to service pistons that are oversize on diameter. SeeData and dimensions in section 11.The piston height above the top face of the cylinder block will stillbe 0,38/0,51 mm (0.015/0.020 in).Note: Always use the full engine number to order new parts.In the factory, the correct piston height is obtained by the use ofsix length grades of connecting rod and one piston height grade.The small end bush is machined eccentrically to obtain thedifferent connecting rod lengths.The correct piston height is important to ensure that the pistondoes not contact the cylinder head and to ensure the efficientcombustion of the fuel.If the crankshaft or the cylinder block is to be renewed, it may benecessary to change the grade of the connecting rods. This willoccur if the correct piston height above the top face of thecylinder block cannot be maintained with the original connectingrod assemblies.Check the length grade of the original connecting rod, operation13-08.Note: If it is necessary, fit a new small end bush,operation13-09.Check the piston height above the cylinder block, operation13-10.Productiongrade lettersA and BC and DE and FService gradelettersB (High)D (Nominal)F (Low)Kit numbersZZ0193ZZ0194ZZ019505/99Printed in England© Propriety information of Perkins Engines Company Limited, all rights reserved58432 51-19M-1-SM 01-29-02 57.4400.0100