PLUG 3G1278 - Caterpillar

Illustration 1 g03186816
Table 1
Specification for 206-1558 Cylinder Head Gp and 378-7413 Cylinder Head Gp
Item Qty Part Specification Description
1 4 7N-1904 Spring Length under test force is 56.36 mm (2.219 inch).
Test force is 245 25 N (55 6 lb).
Free length after test is 62.50 mm (2.461 inch).
2 4 7N-1903 Spring Length under test force is 45.49 mm (1.791 inch).
Test force is 125 12 N (28 2 lb).
Free length after test is 51.54 mm (2.029 inch).
A 2 7N-1902 Dowel Extension is 66.50 1.00 mm (2.618 0.039 inch).
B - - Height from the top of the cylinder head to the top of the valve guides is 26.0 1.0 mm (1.02 0.04 inch).
3 2 255-0897 Valve Guide Bore of the exhaust valve guide before installation is 9.481 0.008 mm (0.3733 0.0003 inch).
4 2 191-6766 Valve Guide Bore of the inlet valve guide before installation is 9.481 0.008 mm (0.3733 0.0003 inch).
5 2 307-4641 Exhaust Valve Before assembly, coat the exhaust valve stems with clean engine oil.
Stem diameter (C) is 9.441 0.010 mm (0.3717 0.0004 inch).
Valve diameter (E) is 56.00 0.15 mm (2.205 0.006 inch).
Face angle is 70.75 0.25 degrees.
6 2 210-2542 Inlet Valve Before assembly, coat the inlet valve stems with clean engine oil.
Stem diameter (D) is 9.441 0.010 mm (0.3717 0.0004 inch).
Valve diameter (F) is 56.00 0.15 mm (2.205 0.006 inch).
Face angle is 19.40 0.25 degrees.
7 2 191-6760 Valve Seat Insert Diameter of exhaust valve seat insert is 60.132 0.015 mm (2.3674 0.0006 inch).
Bore in the cylinder head is 60.000 0.025 mm (2.3622 0.0010 inch).
Face angle is 20.25 0.25 degrees.
8 2 257-9166 Valve Seat Insert Diameter of inlet valve seat insert is 60.640 0.015 mm (2.3874 0.0006 inch).
Bore in the cylinder head is 60.508 0.025 mm (2.3822 0.0010 inch).
Face angle is 20.25 0.25 degrees.