TM  10-3930-643-34 ENGINE,  FUEL,  EXHAUST  AND  COOLING  TROUBLESHOOTING  AND  MAINTENANCE.  (cont) 4-11. Intake and Exhaust Manifolds. (Sheet 5 of 7) CLEANING/INSPECTION  (cont) 13. Inspect intake manifold (9), front exhaust manifold (18) and rear exhaust  manifold  (19). Replace if cracked or distorted. 14. Inspect all other parts. Refer to paragraph 2-9. INSTALLATION 15. Using a 7/16” socket and socket wrench handle, install two pipe plugs (22) on rear exhaust manifold (19). 16. Install rear exhaust manifold (19) and front exhaust manifold (18). NOTE Install  exhaust  manifold  sections as a unit on cylinder head without gasket. 17. 18. 19. Using a 5/8”   socket and socket wrench handle,    install 12 washers (17) and nuts  (16). Tighten nuts (16) to 60 lb-ft. Use a 0.015 inch feeler gage to measure gap  between  cylinder  head  and manifold flange face. If feeler gage will pass through area of measurement, as shown, replace manifold. Using a 5/8”   socket and socket wrench handle, remove 12 nuts (16), washers (17), front exhaust manifold (18) and rear exhaust manifold (19). Go to sheet 6 4-80