PIPE 0945236 - Caterpillar

Earlier Exhaust Manifold Modifications
The earlier exhaust manifold bolt holes (used to fasten the manifold to the cylinder head) can be enlarged from a diameter of 11.0 mm (.43 in) to a diameter of 13.0 mm (.51 in).
The existing spot faces around these same bolt holes can be enlarged from a diameter of 21.0 mm (.83 in) to a diameter of 25.0 mm (.98 in).
The existing bolts and spacers used to fasten the above manifolds to the cylinder head can be replaced with 5P-3961 Bolts and 113-8189 Spacers. Tighten the new 5P-3961 Bolts to a torque of 50 N m (37 lb ft).