Usage:
3408;
3412 Engines;
988B Loaders;
631D, 633D, 637D Tractors
A new procedure is used to tighten the flywheel housing bolts. This will prevent leaks at the gasket between the flywheel housing and the cylinder block. If oil leaks have been a problem at this location on an engine, the installation of a new gasket and use of the new tightening procedure will stop the leaks. Do not use a gasket sealer with the gasket. The gasket sealer can cause the gasket to become soft and the result is another oil leak. Make a note of the new procedure in your Service Manuals until the Service Manuals are changed.
Sequence to tighten flywheel housing bolts for 3408 Engines; 631D, 633D, 637D Tractors.
Procedure to Tighten the Bolts for the Flywheel Housing
1. Tighten bolts 1 thru 8 in number sequence to 100 ± 10 lb ft (135 ± 14 N·m).
2. Tighten bolts 9 and up in number sequence to 40 ± 5 lb ft (55 ± 7 N·m).
3. Again tighten bolts 1 thru 8 in number sequence to 100 ± 10 lb ft (135 ± 14 N·m).
4. Again tighten bolts 9 and up in number sequence to 40 ± 5 lb ft (55 ± 7 N·m).
Sequence to tighten flywheel housing bolts for 3412 Engines.
Sequence to tighten flywheel housing bolts for 988B Loaders.