Genuine 2008 Cadillac CTS Cylinder Head

2008 Cadillac CTS Parts Questions & Experts Answers

• Q: What precautions should be taken before beginning the Cylinder Head removal procedure in 5.7L,6.0L,6.2L V8 engine on 2008 Cadillac CTS?

  A: This should be done when the engine of the car is cold; however, before working on the engine allow it to cool down completely. As with the previous work done, a new set of head bolts will be required for this to happen. Remove the connector from the negative terminal of the battery, and drain the water from the engine. For 5.7L and 6.0L engines remove the intake manifold and the coolant bleed pipe mounting bolts and pipe; for 6.2L engines remove the supercharger. There is no requirement of removing the exhaust manifold from RH cylinder head whereas LH exhaust manifold is required to be removed along with; valve covers, oil dipstick tube. Take out the rocker arms and the pushrods and it is important to keep all the parts in a manner that they will be placed back in the same way as they were removed. Remove the wiring connection from the back of the alternator, then un-bolt and take off the power steering pump along with its rear support from the left cylinder head but do not cut the hoses. In reverse order, rotate the head bolts in 114 turn for their loose and then be removed by hand but ensure that in the middle of the process take measurements on their length and sizes for the right installation of the new head bolts. Pull the heads off the engine gently and if there is friction use prybar or long screwdriver on the intake port, place the heads on wooden cradles to avoid damaging the gasket surfaces. The surfaces of the cylinder head and block must be perfectly clean before installation; it's also important not to scratch the aluminum with such a scraper. Examine the mating surfaces for nicks, deep scratches and other defects that, though may not be deep can be filed away while serious ones may need to be machined. If warpage is assumed, use the straightedge and calculate the angles of the warpage; if the angles exceed specified permissible limits auto-machinist's shop should be consulted. Wipe the mating surfaces and threads of the head bolts with a clean shop towel and brake system cleaner to clean it, and, thereafter, use a wire brush to remove the thread locking compound from 8 mm head bolts. Place the new gaskets over the dowels in the block with the mark concerning the front of the vehicle and then put the heads on the block keeping the gaskets intact. Apply an M8 thread locker of medium strength on the threads of the new 8 mm head bolts before placing them and tightening them with the finger; place new 11 mm head bolts, and similarly tighten them with the finger. Tightening the bolts as per the sequence suggested, tighten the bolts for 4 times or to a torque and angle of rotation as suggested. Replace new O-rings for the coolant bleed pipe and screw in place onto the cylinder heads fastening the bolts to the recommended torque. The remaining part of the installation is just the exact opposite of the removal process, which has been outlined above. Last of all fill with coolant then change the oil & filter, crank up the engine and inspection for proper operating condition and check for any signs of coolant or oil leakages.