1.2 CYLINDER HEAD 1.2.3 Cleaning of Cylinder Head Clean the cylinder head as follows: 1. Keep parts segregated according to original position to assure proper reassembly, if parts are to be reused. 2. Remove all threaded plugs. 3. Steam clean the cylinder head once it has been stripped. 4. If coolant passages are heavily coated with scale, remove the injector tubes and cup plugs, refer to section 2.4.2. Clean the head in a descaling bath, refer to section 1.2.2. EYE INJURY To avoid injury from flying debris when using compressed air, wear adequate eye protection (face shield or safety goggles) and do not exceed 276 kPa (40 psi) air pressure. 5.
Clean the camshaft and camshaft bearings, valves, springs, valve rotators and rocker shafts in fuel oil and blow dry with compressed air. 6. Clean the rocker arm assemblies. 1.2.3.1 Inspection of Cylinder Head The following steps must be performed before inspecting the cylinder head: 1. Replace the plugs removed for cleaning. If the old plugs are reused, coat the plugs with Loctite® PT-7260 , pipe sealant with Teflon, or equivalent. NOTE: If both front fuel galley plugs have been removed, it will be necessary to replace both plugs. 2. If injector tubes have been removed, install new injector tubes.
Refer to section 2.4.6 for the N2 injector tubes and refer to section 2.6.2 for N3 injector tubes. 3. Install new cup plugs using a good grade non-hardening sealant such as Loctite® 620 or equivalent. 4. Perform the following tests for cylinder head inspection. [a] Pressure test, refer to section 1.2.3.2. [b] Firedeck straightness test, refer to section 1.2.3.3. (Rev. 2005) All information subject to change without notice. 1-46 6SE483 0507 Copyright © 2005 DETROIT DIESEL CORPORATION