Exhaust Manifold Stud Replacement

STANDARD PROCEDURE - EXHAUST MANIFOLD STUD REPLACEMENT

Any exhaust manifold stud which is found to rotate during the maniverter removal or installation process must be replaced following this procedure.

CAUTION: The maniverter studs are installed in the cylinder head with a thread sealant. If the studs rotate during service this indicates that the seal is broken and the stud must be replaced. Failure to replace the studs can result in engine oil leaking onto the exhaust manifold.





1. Remove and discard the exhaust manifold stud.
2. Clean all the holes using electronic contact cleaner applied to a plastic bristle/bottle brush. Do not use parts cleaner. On the five upper stud holes, be careful not to drive the brush into the engine cavity. Use the brush to draw out any residual oil or hardened loctite. Wipe the exhaust face clean when completed with a lint free cloth.
3. Apply Loctite 277 to the manifold end of a new exhaust manifold stud. Apply the Loctite 360 degrees around the part for a minimum of 4 threads.





4. Hand start the exhaust stud and with M8 hex nuts (do not use lock nuts). Tighten the exhaust stud to 11 Nm 97 in. lbs.) and remove the two nuts.
5. Measure the protrusion length (1) of the installed exhaust stud. The length must be between 24 - 26 mm (0.945 - 1.023 in.) when fully seated.
6. Wait a minimum of 15 minutes before installing the maniverter. This will allow the Loctite 277 to fully set.

Note: Any rotation in the loosening or tightening direction of the stud after it is assembled breaks the bond in the joint. If the bond is broken, remove the stud and start over at Step 1.