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DEFENDER ENGINE 5 . Lift-out the crankshaft either by hand or hoist. If a hoist is used be sure to insert adequate protection between the sling and joumals to avoid damage. 6 . Remove the mainbearing upper shells from the 7. Remove the two thrust washers from each side of the centre bearing location. 8. Remove the four cylinder lubrication, jet tubes. CYLINDER BLOCK INSPECTION AND OVERHAUL Inspection Degrease the cylinder block and carry o u t a thorough visual examination checking for cracks and damage. To check each main shells. and check with a feeler gauge that n o A clearance indicates either a bent bolt, damaged dowl, distortion of the caps o r block, o r that the cap has been filed or machined in an attempt t o reduce any clearance d u e t o therefore any clearance should be investigated Cylinder bores Measure the cylinder bores for ovality, taper and general wear, using any suitable is best for checking ovality and a cylinder gauge for taper. Check the ovality of each bore by taking measurement at the t o p of t h e cylinder 5. The difference between the two figures is the ovality at the t o p of the bore. Similar measurements should b e made approximately 50 (2.0 ins) up from the bottom of the bore so that t h e overall ovality may be determined. The taper of each cylinder is determined by taking measurements at the t o p of each bore at right angles to the gudgeon pin line, the difference between the measurements is the taper. n To establish maximum overall bore wear, take measurements at as many points as possible is the maximum wear and should b e compared with of the cylinder bore. Maximum permissible ovality 0,127 (0.005 in). Maximum permissible taper 0,254 (0.010 in). Maximum permissible overall wear 0,177 (0.007 in). 51 |