SAFARI

48 4 DLT ENGINE No. of strokes/min. - 50 Coolant to be used - Honilo 480 / Kerosene Spark Out or Idle stroke after honing - One to two. Hydraulic pressure for stick expansion - max. 5 bar. Stick - D181 Diamond or (Sic 39C68 Jk 8VK) Size : 8 X 8 X 70 mm 2.2 Base Honing : The function of this honing stage is to generate number of equal pitch vallies to give a good lubrication effect for the engine. Here the pressure for stick expansion must be less (2.5 to 3.5 bar max.) Operation must be gentle. Max. 15 micron material to be removed. Shape or geometry of the B/Bore must be 8 micron max. Size at bottom bore must be more by 2 to 5 um than the top size. Surface finish generated after "Base" honing must be below 1 um Ra or 0.8 to 1.0 um Ra max. Machining data : RPM - 120 No. of Stroke/min - 55/60 Coolant - Honilo 480/Kerosene Spark out/Idle stroke - One or two Hydraulic Expansion Pressure - 2.5 to 3.5 bar max. Stick - 39C 120 J8 VK P TR 22 Size 8X8X70 mm. or 39C 100 J8 VK P TR 22 Size - same or SG 100 - 20 J VK Size 8X8X70 mm Stock - Material to be left for plateau operation - 5 um. 2.3 Plateau Honing : The function of this honing stage is to eliminate the run in time of the block. This operation is removing the crest surface peaks to generate a plateau effect on running in surface. This plateau band must have very find surface to generate a gliding effect of lubrication film for piston rings. Material removal expected is 3 to 5 microns only. Machining data : RPM - 120 No. of strokes/min. - 60 Coolant - Honilo 480 Operation to be carried out for 5 to 8machining strokes only (as suitable to get good plateau). 2.4 Brush Honing 1 mm dia. Size bristles nylon make to be used just to get a cleaning effect of honed surface. 10 to 15 strokes/ bore the operation to bemade.Honilo 480 / Kerosene to be used with a heavy jet. RPMmust/may be more than 200. This operation can be carried out on a radial drill machine holding the brush holder in the normal adapter. Operator can make 10 to 15 strokes by hand only. This operation does not remove any material. 3.Washing and Cleaning of Job : Washing of the job after honing operation is a must. This is preferably hot bath. Clean the job by air at a closed area to remove dirt and dust. 4. Oil & Grease : After washing and air cleaning the barrel bore must be lubricated or greased, if the block is to be assembled later.