SHUTOFF AS-AIR 4778028 - Caterpillar

- METCO Anti-Bond should be applied at least 76 mm (3.0 inch) wide around the blasted area.- The valve seat areas, casting relief areas, and dowel pin holes can be masked with METCO Anti-Bond, silicon rubber, bulk ceramic fiber, or a combination of these materials.- Grind coating back to base on edges where possible.- Pressure flush head with high-pressure water and wash to remove all grit.Flame Spray Equipment and Procedure
Table 5
Maximum Surface Finish ACERT: 1.6 Micrometers (63 Microinches)
C27 and C32: Brinell 1.6 Micrometers (63 Microinches)
C175: 0.8 Micrometers (32 Microinches)
MHI 3044-3066 - (-)
Reason for Spraying Wear, erosion, head dimension under due to rework
Mating Part Contact Area & Material Head gasket
Metco Equipment Type 6P-II by Oerlikon Metco
Metco Material Metco 453
Finish Thickness 0.25 0.38 mm (0.010 0.015 inch)
Finishing Allowance Machine 0.64 mm (0.025 inch) Grind 0.51 mm (0.020 inch)
Spray Angle 90°
Substrate Pre-Heat Temperature 66.0° C (150° F) Do not direct flame on area to be sprayed
Substrate Temperature During Spraying Not to Exceed 148° C (300° F)
Auxiliary Cooling If desired
Rotation/Traverse Device Lathe or headstock/tailstock arrangement, rotary turntable
Rotation/Traverse Device 91.4 SMPM (300.00 SFPM)
Surface Preparation Method Grit Blast
If the entire head gasket-mating surface is to be arc sprayed, some shops prefer to pre-grind the head. Remove any major damage. Allowing for a minimum 0.25 mm (0.010 inch) coating, reduces technique dependency in producing an even coating and reduces material cost and finish grinding time.
Finishing Method Machine
Recommended Wheel Norton 23A 30E12VBEP or SGL abrasive HSA24F13-VKP
Machining Equipment Type Milling machine or Lathe
Recommended Cutter Grade Sandvik 310-K-10 LNCK, C2, 883 Carboloy, or equivalent
Remarks A low spot ONLY repair should not be considered unless at least 0.05 - 0.08 mm (0.002 - 0.003 inch) can be removed from the head thickness during the finishing operation.
Table 6
Flame Spray Process (6P) Procedure Check List
Clean Part Degrease in hot caustic solution
Undercut If the entire head gasket-mating surface is to be arc sprayed, some shops prefer to pre-grind the head. Remove any major damage. Allowing for a minimum 0.25 mm (0.010 inch) coating, reduces technique dependency in producing an even coating and reduces material cost and finish grinding time.
Chamfer All edges must have at least 0.79 -1.58 mm (0.031 - 0.062 inch) chamfer.
Remove Oxide Use fiber flap brush or Clean/strip disc
Clean Spray Area Metco cleaning solvent or equivalent
Mask for Blast Duct tape
Blast Equipment Pressure type only
Grit Type and Size 24 mesh aluminum oxide
Blast Air Pressure 690 kPa (100.0 psi)
Blast Nozzle to Work Distance 51 mm to 150 mm (2.0 inch to 6.0 inch)
Remove Blast Mask Remove mask, make sure that surface is clean
Mask for Spray Metco Antibond or blue layout dye
Spray Equipment Type 6P-II Hand Held Thermo Spray System by Oerlikon Metco
Auxiliary Cooling If desired
Nozzle 6P-7CA-K "K" Nozzle
Air Capacity/Pressure 6P-3/Cooling air 140 - 170 kPa (20.0 - 25.0 psi)
Oxygen Pressure 210 kPa (30.0 psi)
Oxygen Flow 1190 L/h (42.0 cfh)
Fuel Gas Pressure 100 kPa (15.0 psi)
Fuel Gas Flow 1415 L/h (50.0 cfh)
Carrier Gas Pressure 380 kPa (55.0 psi)
Carrier Gas Flow