DETROIT DIESEL 53
EXHAUST MANIFOLD (AIR COOLED)
The exhaust manifolds has an outlet to accommodate a square exhaust outlet flange (Fig. 1)
Current manifolds, flanges (square) and flange gaskets have SAE standard dimensions.
Remove Exhaust Manifold
Disconnect the exhaust pipe or muffler from the exhaust manifold flange.
Loosen, but do not remove, one of the center exhaust manifold nuts. Remove the other nuts and washers.
Support the manifold and remove the center nut and washer.
Remove the manifold and gasket from the cylinder head.
Remove any loose scale and carbon that may have accumulated on the internal walls of the exhaust manifold. Clean
the manifold and check for cracks, especially in the holding lug areas.
Clean all traces of gasket material from the cylinder head.
Examine the exhaust manifold studs. Replace dam- aged studs. Apply sealant to the threads and drive new studs to 25-
40 lb-ft torque (1.40" to 1.50" height).
Install Exhaust Manifold
Place a new gasket over the studs and against the cylinder head.
Position the exhaust manifold over the studs and hold it against the cylinder head.
3. Install the washers and nuts on the studs. If beveled (dished) washers are used, position them so that the crown
side faces the nut
Fig. 1 - Typical Air-Cooled Exhaust Manifold (Square Flange) Mounting
October, 1970 SEC. 6.1 Page 1