1981/05/12 Caterpillar


Larger Valve Springs

Usage:




All Naturally Aspirated 3208 Engines

Description of Change: New valve springs, retainers, and spacers are used in the cylinder head group on naturally aspirated 3208 Engines. The new valve springs have the same spring rate as the former valve springs. The new springs are made of a larger diameter wire and also have a larger coil diameter. This gives a better resistance to high stresses than the former springs. The larger coil diameter for the new springs makes it necessary to use new spacers and retainers. Also, new fuel injection nozzle clamps are used to provide the clearance needed for the larger valve springs.

Adaptable To: The new parts are in effect with Serial Numbers 32Y74575, 90N54557, 75V7540, and 79V8714. The new parts are direct replacements for the former parts on all cylinder heads, except the 9N1107 Cylinder Head. The spring seat area on the 9N1107 Cylinder Head can be machined to a new diameter of 42.16 ±0.25 mm (1.660±0.010") so the new parts can be used. See the illustration. The part number for the cylinder head is on the cylinder head inside the valve cover.


Spring seat area of the cylinder head.

Caterpillar Information System:

1981/05/12 Remove Direct Injection Fuel Nozzles With 6V4061 And 6V4054 Nozzle Pullers
1981/05/12 New Tool Makes Glow Plug Wire Removal Easier
1981/05/12 Crankshaft Failures; New Thrust Plate
1981/04/09 6V3150 Engine Pressure Group Gives Direct Indication Of Manifold Pressure
1981/04/09 Fuel Pressure Relief Valve Is Shown Inverted (wrong End Up) In Parts Book Illustrations
1981/04/09 Use 6V4058 Universal Extension To Remove And Install Starter Bolts
1981/04/09 Check All Settings When Fuel Injection Pump Group Is Installed
1981/04/09 List Of Service Publications
1981/04/09 Improve Use Of Engine Service Manual Microfiche
1981/04/09 Electrical Information For Egr (exhaust Gas Recirculation) Systems On 3208 Truck Engines So Equipped
1981/04/09 Clean Electrical Contacts In Exhaust Gas Recirculation (e.g.r.) Switch Group And Cover Assembly Before Installation
1981/04/09 6V3197 Spacer, 6V3041 Tool Group Available For Use During Removal And Installation Of Piston Pin Bearings
1981/05/12 FT1585 Plate Can Be Fabricated For Governor Spring Guide Replacement
1981/05/12 New 6V3060 EGR System Tester Group Available
1981/07/07 Correct Use Of Keystone Ring Groove Gauges
1981/07/07 Use 6V4069 Body Group To Remove Tapered Drive Sleeve
1981/07/07 Caterpillar Cooling System Conditioner (liquid Or Spin On Elements) Can Be Used In Ford Truck Installations
1981/07/07 Troubleshooting Water In Shut-off Solenoid Housing
1981/07/07 Replacement Bushings For Delco-remy Electric Starting Motors Must Be Machined For Correct Clearances
1981/07/07 Cylinder Liners Can Now Be Reconditioned Automatically
1981/07/07 New Gasket Used In Front Housing Group
1981/07/07 List Of Service Publications
1981/07/07 Use 6V4089 Reamer Assembly To Clean Nozzle Bores
1981/07/07 Use 6V4828 Snap Ring Pliers To Remove Snap Rings From Turbocharger Housing
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