Measure wear of the cylinder bore at the top and bottom of piston ring travel.
(1) Cylinder bore [standard, original size] … 4.5000 to 4.5015 in.(114.300 to 114.338 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)
NOTE: Install camshaft bearings with the oil hole toward the top of the cylinder block.
(3) Width of main bearing cap … 6.5600 ± .0007 in.(166.624 ± 0.018 mm)
Minimum permissible width of main bearing cap … 6.5580 in.(166.573 mm)
Width of main bearing cap guide (in cylinder block) … 6.5590 ± .0005 in.(166.599 ± 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:
1. Put 2P2506 Thread Lubricant on bolt threads and washer face.
2. Tighten all bolts in number sequence to … 30 ± 3 lb. ft.(40 ± 4 N·m)
3. Put a mark on each bolt and cap.
4. Tighten all bolts in number sequence from mark … 120 ± 5°
(6) Dimension (new) from centerline of crankshaft bearing bore to bottom of block (pan rails) … 3.7500 ± .0015 in.(95.250 ± 0.038 mm)
(7) Dimension (new) from centerline of crankshaft bearing bore to top of block (top deck) … 12.703 ± .005 in.(322.66 ± 0.13 mm)
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There are holes in the bore for the main bearings, between the cylinders for piston cooler orifices. These holes must have orifices installed or low oil pressure will be the result. |
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