1979/05/21 Caterpillar

How To Prevent Cylinder Block Failure From Cracks{1201}

Usage:

All 4.75"
Bore Engines

Small cracks in the cylinder liner support webs on 4.75" bore engines do not necessarily have an effect on engine service life and/or performance. However, if these cracks are permitted to become too large, they can cause cylinder block failure.

To check for cracks in this area, inspect the cylinder liner support webs carefully any time work is being done in this area. See Illustration 1. If a small crack is found, a hole approximately .12" (4 mm) in diameter can be drilled at the end of the crack so it will not extend further. See Illustration 2. This procedure will permit the use of the existing cylinder block instead of installation of a new cylinder block.

Illustration 1. Location of crack in web of cylinder block.

Illustration 2. Using a right-angle drill to drill hole.

Caterpillar Information System:

1979/05/21 Do Not Use Later 9N3979 Nozzle Assemblies In Plate Of Earlier Nozzle Assemblies{1254}

1979/05/21 New Flywheel Housing Corrects Clearance Problem With Cylinder Block{1157,1158,1201,1453}

1979/05/21 Shorter Mounting Bolts Used For Glow Plug Wiring{1403,1412}

1979/05/14 Two Fuel Pressure Pumps Are Available To Increase Fuel Pressure{1250,1295}

1979/05/14 New Filler Bands Give A Better Seal Between The Cylinder Liners And Cylinder Block{1201,1216}

1979/05/14 5P3519 Piston Ring Gauge Has Improved Design For Better Accuracy And Easier Use; Corrected Information For Use On Pistons That Have Two Ring Grooves{0653,1214}

1979/05/14 How To Adapt The 5P1759 Tachometer Drive Group (Dealer Tool) To D9H Tractors, 594H Pipelayers And D353 Engines Equipped With Electric Hour Meters When Engine RPM Must Be Checked{0654}

1979/05/14 New BrakeSaver Manifold Prevents Oil Leakage{1155}

1979/05/07 Serialized Attachments Added To Machine Parts Books{0375}

1979/05/07 New Oil Pump Has Improved Relief Valve For Better Pressure Control{1304}

1979/05/07 An Ammeter Calibration Group Is Now Available{0651}

1979/05/07 Change In Part Number Of Water Temperature Regulator Used In Attachment Oil Cooler Groups{1355,1378}

1979/05/21 New Washers For Injection Valve Nozzles Must Be Added To Valve Grinding Gasket Kit When Used With Later Engines{7555,1254}

1979/05/21 Rod Bearings For Parts Service Have Reliefs (Grooves) Cut On The Outside Diameter{1219}

1979/05/28 9S8100 Tool Group Changed To Use With Fuel Transfer Pump Only{0622}

1979/05/28 A New Method To Clean And Polish Engine Valve Stems{0674,1105}

1979/05/28 Seat Belt Maintenance{7327}

1979/05/28 New Type Products Available To Clean Cooling Systems{1350}

1979/05/28 Correct Locations To Connect Gauges For Checks Of Engine Oil Temperature And/Or Pressure{7455,7450,1300}

1979/06/04 New "L-Shaped" Clutch Plates Now Used{3302}

1979/06/04 New Caterpillar Yellow Paint{0670}

1979/06/04 Check Crankshaft Seals During Installation Of Engine Overhaul Gasket Kits; Add A Wear Sleeve When Needed{7555,7558,1161}

1979/06/04 New Centering Rings For Oversized Main Bearings{0665,1230}

1979/06/11 New Specification For Installation Of Camshaft Front Bearing In Cylinder Block{1211}