1983/03/16 Caterpillar


Engine Valve Stem "Use Again" Specifications

Usage:


All Caterpillar Engines

The current Guideline For Reusable Parts "Valves and Valve Spring Specifications," Form SEBF8034-03 has some "use again" minimum valve stem diameters that are different from those in Form SEBF8034-02. The metric "use again" minimum valve stem diameters in the current guideline were rounded (changed) to the nearest .005 mm. These rounded dimensions will make it possible for the dealer to use either the 6V87 Valve Stem Gauges or standard metric gauges to check the diameter of the valve stems.

The chart which follows shows the numbers which were rounded to the nearest .005 mm. The difference in the rounded numbers is so small that it will not change the "use again" decision. Either set of dimensions can be used. There was no change made to inch dimensions.

Gauges other than the 6V87 Valve Stem Gauges can be used to measure the valve stems. One example of this is the 652 MJZ Universal Dial Bench Gauge. See the illustration. This gauge can be used with metric plug gauges to check all valve stems in Caterpillar Engines. The plug gauges are used to set the dial indicator to the minimum "use again" dimension. The valve stem can then be put in position under the indicator tip. The indicator will then show if the valve stem is within the "use again" specifications.

The 652 MJZ Universal Dial Bench Gauge is available from:

L.S. Starrett Company
Athol, MA 01331
U.S.A.
Phone: 617-249-3551
Telex: 928-427

The metric plug gauges are available in .005 mm increments from:

Helco Precision Cutting Tools And Gages, Inc.
4450 Virginia
St. Louis, MO 63111
U.S.A.
Phone: 314-752-9555


Use of the universal dial bench gauge to check a valve stem.

Caterpillar Information System:

1983/03/16 Additions To Reference Chart For Major Production Changes
1983/03/16 New Instruction Decal Used On 6V4060 Engine Set Point Indicator
1983/03/16 Check Cylinder Bores For Chamfer During Reconditioning
1983/03/16 Change Made To 6V3032 Deluxe Test Lead Kit
1983/03/16 New Clutches For Rear Power Take-Off
1983/03/16 New Rack Shutoff Solenoid Available
1983/03/16 Test Procedure For Hydramechanical Shutoff After Engine Storage
1983/02/16 Change In Repair Centers For 5P2160 Horsepower Meter Group
1983/02/16 New Clutch Retraction Pins And Seals
1983/02/16 Parts Service Information For Pistons
1983/02/16 Disconnect Fuel Lines And Install Caps Before Unit Injectors Are Removed
1983/02/16 Improved Mounting Assembly For Speed Switch Contactor Group
1983/03/16 New Turbocharger Inlet Tube Assembly And New Seal Available
1983/03/16 Use FT1783 Fixture To Drill Vent Holes In Impeller
1983/03/16 "Gas Engine Application And Installation Guide" Now Available
1983/04/27 Use The 6V5000 Infrared Thermometer Group To Measure Temperatures
1983/04/27 List Of Service Publications
1983/04/27 8S1603 Socket Group For Use On Bolts With 12 Point Heads
1983/04/27 New Shutoff Solenoid Group Used
1983/04/27 Changes To Valve Clearance Settings
1983/04/27 Pistons With Thicker Top Rings Must Be Used In Correct Applications
1983/04/27 New Special Instruction Available For 6V4135 Halogen Leak Detector
1983/04/27 Remove Plastic Plug From Fuel Transfer Pump
1983/04/27 New Gasket And Cover Used On Governors
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