1.2L REVOTRON ENGINE 67 1. Check the height of each valve seat insert with respect to the cylinder head mating surface. Replace the valve seat if worn beyond the specified limit. 2. Measure the runout of the valve seat with respect to the valve guide axis. Maximum runout is 0.030 mm. Replace or resurface the valve seat(s) as necessary. Cylinder Head Vale Seat Resurfacing NOTE The valve seat must be free from chatter marks, scratches and other specifications. 1. Lap the valves and valve seats to a smooth and even finish using lapping paste and a hand pump grinder or by inserting the valve into the cylinder head and rotating to achieve the proper finish. 2. Coat the valve seat with carbon blue I Prussian blue dye and insert the appropriate valve into the cylinder head. 3. Rotate the valve under axial pressure several times and remove from the cylinder head. 4. Inspect the area of contact created by the axial rotation of the valve. The contact pattern should be equal and unbroken around the circumference of the seat. The distance from the narrow diameter of the valve seat face to the contact line should be 0.5 mm. F. Roller Finger Follower 1. Measure the diameter along several points of both rocker arm roller. The rocker arm roller diameter should be Ø17.0 -0.016/-0.027 mm. Replace the rocker arm if deformed. G. Hydraulic Lash Adjuster (HLA) Hydraulic lash adjuster uses Engine oil pressure for its operation. In case of a freshly assembled Engine, do not run for a long time; there are chances of valve train noise / tappet noise appearing when the engine is started. HLA noise can be heard as repeated tappet like noise when engine is running at low idle speed. Following procedure is recommended to eliminate the noise. Raise the Engine speed to 500rpm without load (Vehicle stationary) to bleed the hydraulic chamber of HLA. The noise should disappear in15-30seconds. If the noise still persists, run the engine further under same condition (no load at 500 RPM) for several minutes. The noise should disappear in 3 to 30 mins, in few cases. In a very rare case if the noise is still heard, the HLA is stuck in compressed position and has to be replaced Oil pressure in HLA gallery to be 0.7 bar for normal functioning.
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