Connecting Rods, Pistons & Cylinder Sleeves

c)Check the connecting rods for alignment (Fig.6). The bores must be square and parallel with each other in all planes within +0.12 (+0.005 inch) (L-6) measured 127 mm (5 inches) each side of the centre line (A-6), if necessary realign by straightening the connecting rod or replace them.

d)Check the threads in the connecting rod big end for wear and damage.

Removing

1.Cylinder number

2.Top compression ring

3.Zud Compression ring

4.Oil control rings

5.Piston pin snap ring e)Check the wear and condition of the connecting rod bushings. If replacement is necessary proceed as follows : f)Check the piston pin for wear or corrosion. g)If the piston pin is a slack fit in an otherwise serviceable piston, the piston bore and connecting rod bushing can be reamed to take an oversize piston pin. Refer the specifications for dimensions. h)Insert piston ring in bore and use a piston without ring to it square in the bore. Check the ring gap (Fig. 7). i)Repeat operation (h) with each piston ring and reject anywhere the gap exceeds. (0.030 inch). j)Check new rings in the same manner, as detailed in operation (h) and check the gap to specifications. The ends of the ring may be filled carefully to bring the gap within the limits. k)Check the clearance between the connecting rod bearings and the crankshaft as follows :-

1.Press out the old bushing (10-2).

2.Align the oil hole in the new bushing with the oil hole in the connecting rod and, using a pilot dolly, press the bushing into the rod.

3.Ream the bushing to the dimension given in specifications and check the fit of the piston pin.

NOTE: Do not rotate the crankshaft while this check is being made.

1)Assemble the insert to the connecting rods and caps.

2)Lay a length of plastigauge across the bearing cap insert.

3)Install the connecting rod on the crankshaft all the main rod and tighten bolts to the correct torque.

4)Remove each bearing cap and measure thickness of the plastigauge to determine the bearing clearance.

Remove the connecting rod from the crankshaft.