Buick Le Sabre Engine >> ENGINE VIBRATION & FLYWHEEL MOUNTING PROCEDURE

Buick Le Sabre Engine >> ENGINE VIBRATION & FLYWHEEL MOUNTING PROCEDURE

Engine Vibration And Flywheel Mounting Procedure
On Buick 6.6L & 7.0L (401 & 425 CID) Engines


Buick 6.6L and 7.0L (401 & 425 CID) engines are balanced to very close limits. The replacement of any part within the engine or drive line can result in a vibration condition. In replacing the engine or crankshaft the following instructions should be followed.

1. Mark drive shaft before disconnecting so that installation can be in original position.
2. If automatic transmission unit, mark position of converter to flex plate.
3. Remove engine. Check all motor mounts and replace if broken or damaged.
4. Install engine. Use extreme care to see that flywheel, or flex plate bolted to converter are installed in original position.
5. Align flex plate or flywheel to crankshaft, aligning hole in crankshaft flange. See (A)

Following the above procedure, if a vibration is experienced, it will then be necessary to purchase balance weight part #1178109 from a Buick dealer and install it under head of two converter pump bolts, then start engine to check vibration. The weight may have to be rotated to a different location until vibration is corrected. Use tachometer and note critical speeds.

Balancing should be included in the labor charge of installing
the engine or crankshaft.

(insert illustrations)

Align hole (A) in crankshaft flange to (B) alignment hole in flywheel or converter drive plate. Converter drain plug (C) must be installed in notch (D) in drive plate to allow removal of drain plug.

The AERA Technical Committee




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