158908-4620 ZEXEL 9 421 622 978 BOSCH MOTOR 9421622978 1589084620

Measure wear of the cylinder bore at the top and bottom of piston ring travel.(1) Cylinder bore [standard, original size] ... 4.5005 .0005 in.(114.313 0.013 mm) The recommendation is made to make the cylinder bore the next size larger when the size of the bore is ... 4.5060 in.(114.452 mm)Cylinder bore must be made the next size larger when the size of the bore is ... 4.5090 in.(114.529 mm)Cylinder bore [.020 in. (0.51 mm) larger than the original size] ... 4.5205 .0005 in.(114.821 0.013 mm)The recommendation is made to make the cylinder bore the next size larger when the size of the bore is ... 4.5260 in.(114.960 mm)Cylinder bore must be made the next size larger when the size of the bore is ... 4.5290 in.(115.037 mm)Cylinder bore [.040 in. (1.02 mm) larger than the original size] ... 4.5405 .0005 in.(115.329 0.013 mm)Maximum permissible wear of cylinder bores (replacement of the cylinder block is necessary) ... 4.5490 in.(115.545 mm)(2) Bore in block for camshaft bearing ... 2.6525 .0005 in.(67.374 0.013 mm)(3) Width of main bearing cap ... 6.5600 .0005 in.(116.624 0.013 mm) Minimum permissible width of main bearing cap ... 6.5580 in.(116.573 mm)Width of main bearing cap guide (in cylinder block) ... 6.5590 .0005 in.(116.599 0.013 mm)(4) Bore in block for main bearing ... 3.7075 .0005 in.(94.171 0.013 mm) Permissible amount of distortion in bore ... 3.706 to 3.709 in.(94.13 to 94.21 mm)(5) Torque for bolts holding caps for main bearings: A. Put crankcase oil on bolt threads and washer face.B. Tighten all bolts by number to ... 60 15 lb. ft.(8.3 2.0 mkg)C. Again tighten all bolts by number to ... 175 10 lb. ft.(24.2 1.4 mkg)Engines with Serial Numbers 98M2494 and Up, tighten bolts (5) holding caps for main bearings in the following sequence: 1. Put crankcase oil on bolt threads and washer face.2. Tighten all bolts by number to ... 30 3 lb. ft.(4.1 0.4 mkg)3. Put a mark on each bolt and cap.4. Tighten all bolts by number from mark ... 120° 5°