Flywheel install
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Burning Brakes
Joined: Oct 2004
Posts: 801
Likes: 17
From: Middletown Delaware
Flywheel install
Removed the flywheel from the 66 today 327 to replace. The alignment dowel pin is missing and the flywheel alignment hole was installed 180 degrees out fram the crank alignment hole . Is there a reason for this or I am missing something besides a dowel pin or maybe bubba was here. 
Dave
Dave
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On ALLLLLLLLLLLLLLL Chevrolet V8 engines (with 2-piece rear main seal), EXCEPT, EXCEPT, EXCEPT the SB400 and the 454BB, beginning with the very first 265 in 1955, the flywheel can be bolted onto the crankshaft in ANY position! Again, EXCEPT for the SB400 and 454, ALLLL Chevy V8 engines are INTERNALLY balanced, thus, the flywheels for those engines are NEUTRAL balanced. MOST of those engines DID NOT have an alignment dowel pin in the rear flange of the crankshaft. ALLLLLLLLLLLLLLL bolt holes on ALLLLLLLLLLLLLLL Chevy V8 engines (with 2-piece rear main seal) are EQUALLY spaced, so it does not matter which way the flywheel is bolted on----------EVEN THOUGH BOTH THE CRANK FLANGE AND THE FLYWHEEL DO HAVE A HOLE FOR AN ALIGNMENT PIN. PERIOD (that includes SB400 and 454 engines).Since the SB400 and 454 engines are EXternally balanced, their crankshafts had, and needed, an alignment pin because installation of the flywheel on those two engines was critical.
When I assemble ANY engine, whether it be INternally balanced, or EXternally balanced, I do install the flywheel with the alignment holes in the same position.
Tom Parsons
Race Director
Joined: Jun 2006
Posts: 17,901
Likes: 751
From: Inverness FL
St. Jude Donor '07
On ALLLLLLLLLLLLLLL Chevrolet V8 engines (with 2-piece rear main seal), EXCEPT, EXCEPT, EXCEPT the SB400 and the 454BB, beginning with the very first 265 in 1955, the flywheel can be bolted onto the crankshaft in ANY position! Again, EXCEPT for the SB400 and 454, ALLLL Chevy V8 engines are INTERNALLY balanced, thus, the flywheels for those engines are NEUTRAL balanced. MOST of those engines DID NOT have an alignment dowel pin in the rear flange of the crankshaft. ALLLLLLLLLLLLLLL bolt holes on ALLLLLLLLLLLLLLL Chevy V8 engines (with 2-piece rear main seal) are EQUALLY spaced, so it does not matter which way the flywheel is bolted on----------EVEN THOUGH BOTH THE CRANK FLANGE AND THE FLYWHEEL DO HAVE A HOLE FOR AN ALIGNMENT PIN. PERIOD (that includes SB400 and 454 engines).Since the SB400 and 454 engines are EXternally balanced, their crankshafts had, and needed, an alignment pin because installation of the flywheel on those two engines was critical.
When I assemble ANY engine, whether it be INternally balanced, or EXternally balanced, I do install the flywheel with the alignment holes in the same position.
Tom Parsons
Bill
Burning Brakes
Joined: Dec 2010
Posts: 1,223
Likes: 360
From: Southington CT
On ALLLLLLLLLLLLLLL Chevrolet V8 engines (with 2-piece rear main seal), EXCEPT, EXCEPT, EXCEPT the SB400 and the 454BB, beginning with the very first 265 in 1955, the flywheel can be bolted onto the crankshaft in ANY position! Again, EXCEPT for the SB400 and 454, ALLLL Chevy V8 engines are INTERNALLY balanced, thus, the flywheels for those engines are NEUTRAL balanced. MOST of those engines DID NOT have an alignment dowel pin in the rear flange of the crankshaft. ALLLLLLLLLLLLLLL bolt holes on ALLLLLLLLLLLLLLL Chevy V8 engines (with 2-piece rear main seal) are EQUALLY spaced, so it does not matter which way the flywheel is bolted on----------EVEN THOUGH BOTH THE CRANK FLANGE AND THE FLYWHEEL DO HAVE A HOLE FOR AN ALIGNMENT PIN. PERIOD (that includes SB400 and 454 engines).Since the SB400 and 454 engines are EXternally balanced, their crankshafts had, and needed, an alignment pin because installation of the flywheel on those two engines was critical.
When I assemble ANY engine, whether it be INternally balanced, or EXternally balanced, I do install the flywheel with the alignment holes in the same position.
Tom Parsons
Last edited by 4 Speed Dave; Oct 3, 2012 at 03:23 PM. Reason: added info
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Burning Brakes
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From: Florida
Safety Car
Joined: May 2003
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From: Ocean Township NJ
Defective flywheel? Maybe it's because the crank fell off of the bench, onto the flange after I knife edged it.
You think THAT'S bad? Bellhousing runout is a whopping .003" in the x-y plane and .001 in the z plane.
You think THAT'S bad? Bellhousing runout is a whopping .003" in the x-y plane and .001 in the z plane.