1985/08/05 Caterpillar


Head Gasket Replacement Procedure{0350,1100}

Usage:


1100, 3100 and 3200 Series Engines

Use the procedure that follows when replacing a head gasket on the above engines. This procedure can help insure the integrity of the gasket joint between the cylinder head and cylinder block.

1. After removing the cylinder head, scrape any remaining gasket material and carbon residue from the cylinder block top deck and the cylinder head bottom deck. Then finish cleaning the deck surfaces with a light abrasive material, such as steel wool.

2. Visually inspect the deck surfaces for grooves and nicks. Give particular attention to the deck surface locations that contact the head gasket fire rings.

3. Inspect the deck surfaces for flatness. The decks must be flat to within 0.15 mm (.006") for the total span and to within 0.08 mm (.003") for any 152 mm (6.0") span. Give particular attention to the deck area between the cylinder bores.

4. If grooves, nicks, or out of flatness is discovered (Steps 2 and 3), the deck must be resurfaced. Remove only the material necessary to bring the deck surface back into specifications.

NOTE: The Specifications section of the Service Manual gives the minimum dimension between the center line of the crankshaft and the cylinder block top deck. It also gives the minimum dimension between the cylinder head bottom deck and rocker arm mounting surface.

5. Inspect the threaded head bolt holes in the cylinder block. Be sure the threads are clean and in good condition. If necessary use the correct size tap to recondition the threads. Use pressurized air to remove foreign material from the threaded holes.

6. Make sure the deck and head gasket surfaces are clean and dry. Install a new head gasket.

NOTE: Do not use any type of gasket coating or sealer on the head gasket or deck surfaces.

7. Be sure the head bolt threads are in good condition and clean. Put a light coat of engine oil on the head bolt threads and washer surfaces prior to assembly.


NOTICE

Do not put oil in the threaded holes. It could cause a hydraulic lock when the head bolts are installed. This could result in damaged threads or a cracked block.


8. Use the procedure given in the Disassembly and Assembly Section of the Service Manual to tighten the head bolts.

Caterpillar Information System:

1985/08/05 Stronger Push Rod Used{1208}
1985/08/05 Thread Sealant Must Be Used On Air Compressor Mounting Bracket Bolts{1800,1803}
1985/08/05 Rough Handling Can Move Droop Lever Out Of Position{1264}
1985/08/05 New, Corrosion Resistant Water Pump Shaft Available{1389,1361}
1985/08/05 Correct Location And Rotation Of Front Timing Gears{1204,1206}
1985/08/05 Valve Mechanism Groups Use New Lifter Assemblies{1209}
1985/08/05 New Fuel Pump And Governor Drive Shaft Has Pressure Lubrication For Splines{1288}
1985/08/05 Engine Rotation Can Be Changed On 3500 Series Engines{1000}
1985/08/05 New Service Tools Available{0600}
1985/07/15 Engine Air Inlet Adapters{1050}
1985/07/15 Use Care When Handling Water Seals For Cylinder Head Spacer Plates{1115}
1985/07/15 Special Instruction Available To Salvage Governor Housing{1287}
1985/08/05 Remanufactured Cylinder Head Group For NA Engines Must Not Be Installed On T Engines{1100,1108}
1985/08/05 Counterweight Improves Stability Of 8S9902 Jib Group (Track) Tool Cart{0632}
1985/08/05 Correct Operation Of Disconnect Switches{1411}
1985/08/12 Tachometer Drive Is Now An Attachment{1166,1250,7450,7452,7487}
1985/08/12 Eliminating Interference Between Governor Housing And Tachometer Drive{1264,7487}
1985/08/12 Location Of 6V5135 Setscrews In Fuel Pump Group{1250}
1985/08/12 Halogen Head And Flood Lamps Are Now Available{7309}
1985/08/12 The 8T3115 Portable Track Lubricator Can Be Used To Drain And Fill Track Link Joints{0645,4169,4170}
1985/08/12 Thread Lock Now Used On Timing Advance Bolts{1272}
1985/08/19 New Format For Some Special Instructions{0300}
1985/08/19 Improvements Made To Spark Ignited Engines{1100,1104,1105,1207}
1985/08/19 New Address And Phone Number For Ordering Fabricated Tool (FT) Drawings{0600}
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