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| | | | Joined: Dec 2015 Posts: 47 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2015 Posts: 47 |  Just thought about this, in the midst of the excitement to remove the clutch from the truck, I pulled the clutch and flywheel without noting the orientation of the flywheel on the engine/crank. I realized that as I saw the drilled balancing holes on the flywheel, when it was on the floor. I assume this can go back on multiple ways and therefore need to get to TDC before installing or has anyone had any experience otherwise? The truck is a '52 Chevy 3100 with a 235 CI engine. 
Last edited by 4rcFed; 06/27/2018 6:16 PM.
1952 Chevy 3100 (235CI engine)
...T5 swap in progress...
| | | | | Joined: Apr 2007 Posts: 1,038 'Bolter | | 'Bolter Joined: Apr 2007 Posts: 1,038 | In the midst of the excitement to post your question you forgot to tell us what engine you are working on! In my limited experience with Chevy engines from 1937-1958 the flywheel can only go on one way as the orientation dowels are off set, not symmetrical. Some one with more knowledge than I will chime in soon, but I think you will be all right.
Kent | | | | | Joined: Dec 2015 Posts: 47 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2015 Posts: 47 | Thanks for the catch, I updated the first post to state that I am working with a 235CI engine. Currently working on swapping the 4 speed for a T5.
1952 Chevy 3100 (235CI engine)
...T5 swap in progress...
| | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | As a general rule, if there are no index marks, offset dowels or mounting bolts, the flywheel can go on any way, if not, only one way.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: Feb 2004 Posts: 29,746 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,746 | The 235 bolt circle is a Murphy- - - -it can fit in any position. However, the dowels are offset in such a way that there's only one position the flywheel can fit the crankshaft. If the dowels have been removed from the crankshaft flange, get the #1 and #6 pistons exactly on top of the stroke and align the TDC mark on the flywheel with the pointer in the bellhousing window. The balance drilling is done when the flywheel is manufactured, so the holes aren't crankshaft-specific.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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