970951 Volvo.Penta Hexagon screw

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PRIORITY - INSTALLATION OF NEW ENGINE REAR MOUNT ASSEMBLIES IN 631E AND 637E TRACTORS - MAILED US, CANADA, CFEL, COFA, COSA
  The information supplied in this service letter may not be valid after the termination date of this program.   Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.
INSTALLATION OF NEW ENGINE REAR MOUNT ASSEMBLIES IN 631E AND 637E TRACTORS, 1152, PI3150 U-51 AU-40 C-50 E-36 O-36 priority COMPLETION DATE Termination Date
November 30, 1986 May 31, 1987
Problem
The engine 8N111 Mount Assemblies (rear) on some 631E and 637E Tractors are not providing acceptable service life. If an engine mount fails, it can result in a failure of the drive shaft. New engine mount assemblies need to be installed.
Affected Product
Model Identification Number 631E 1AB1 - 591, 593-610 637E 1FB1 - 321, 323, 324, 328-330 1JB1 - 420, 422-438, 440, 447, 448, 450, 453-458
Parts Needed
2 - 7C3567 Mount Assembly
Action Required
PARTS STOCK Dealers parts stock of 8N111 Mount Assemblies can still be used in 988B Loaders and 834B Tractors.
Affected Product
Remove the 8N111 Mount Assemblies from the tractors. Install the 7C3567 Mount Assemblies. Tighten the bolts which hold the support assemblies to the tractor frame to 400 +/- 20 Nm (320 +/- 15 lbft). Check the alignment of the engine and drive shaft. They must be aligned within a maximum of 2.67mm (.105") TIR (total indicator reading).
Owner Notification
U.S. and Canadian owners will receive the attached Owner Notification. WARRANTY ALLOWANCES Caterpillar Dealer Suggested Customer Suggested Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs. (D/N) (Sell) (C/L) (Sell) 100% 8 0 0 0 0 This is an 8-hour job.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling. MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE. Attach. (1-Owner Notification) XYZ Corporation 3240 Arrow Drive Anywhere, YZ 99999 PRIORITY - Installation Of New Engine Rear Mounts MODELS INVOLVED - 631E, 637E Tractors Dear Caterpillar Product Owner: The engine rear mount assemblies on some 631E and 637E Tractors are not providing acceptable service life. If an engine mount fails, it can result in a failure of the drive shaft. New engine mount assemblies need to be installed on the products listed below. The installation will be done at no cost to you. Contact your local Caterpillar dealer immediately and schedule a time to have this service performed. The installation time is approximately eight hours. We regret the inconvenience this may cause you, but urge you to have this service performed as soon as possible to prevent unscheduled downtime. Caterpillar Identification #(s) Attached to May 22, 1986 Service Letter