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#1 |
newly minted old timer
Join Date: Dec 1999
Location: Hudson WI
Posts: 3,513
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fly wheel drill holes
my trany guy says he has never seen this and thinks it may have something to do with my vibration issue. i just thought it was how they balanced the fly wheel, didn’t think much of it. i have seen lots of things balanced like this.
have you guys seen this before? ![]()
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____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban |
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#2 |
Registered User
Join Date: May 2006
Location: Jonesboro, AR
Posts: 916
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Re: fly wheel drill holes
That doesn't look so odd to me. I do notice that the TC mount hole at the bottom doesn't look like the rest. Also, isn't the odd hole in the flywheel supposed to line up with the hole in the crank?
A new flywheel isn't that expensive and would at least eliminate that as a problem. |
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#3 |
newly minted old timer
Join Date: Dec 1999
Location: Hudson WI
Posts: 3,513
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Re: fly wheel drill holes
huh? what hole on the crank?
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____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban |
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#4 |
Registered User
Join Date: Mar 2006
Location: AZ
Posts: 372
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Re: fly wheel drill holes
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#5 |
newly minted old timer
Join Date: Dec 1999
Location: Hudson WI
Posts: 3,513
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Re: fly wheel drill holes
so how can 71 see that? not sure what you are talking about. are you saying the flywheel is on wrong?
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____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban |
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#6 |
Registered User
Join Date: May 2006
Location: Jonesboro, AR
Posts: 916
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Re: fly wheel drill holes
I think it might be turned clockwise. I can see the external crank throw through the big hole by the drill holes. The alignment hole should be in the center of that. Also there's no dark shadow behind that odd hole in the flywheel.
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#7 | ||
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: fly wheel drill holes
Quote:
"In theory" a flywheel/flexplate for an internally balanced engine should have a "zero" balance, meaning that it would spin perfectly on it's own. If it is off for some reason, it could be corrected, but only to itself. It should never be part of the balance of the rest of the rotating assembly. This would make it un-useable for any other crank...but the worst part is replacing it if it should ever be damaged. The entire assembly would need to be re-balanced. If you have a way to have that one checked w/o spending too much money, it might be worth a try.
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#8 |
newly minted old timer
Join Date: Dec 1999
Location: Hudson WI
Posts: 3,513
|
Re: fly wheel drill holes
i guess it doesnt matter, they are putting a new one on.
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____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban |
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#9 |
Ex-Minitrucker
Join Date: Apr 2009
Location: Bushnell, FL
Posts: 301
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Re: fly wheel drill holes
I think he was talking about the 4 holes at the 1 o'clock position that look like someone truies to balane the flywheel with a 1/2" drill bit.
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#10 | |
Registered User
Join Date: Mar 2006
Location: AZ
Posts: 372
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Re: fly wheel drill holes
Quote:
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#11 |
Senior Member
![]() Join Date: Aug 2008
Location: Cedar Park, Texas
Posts: 7,500
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Re: fly wheel drill holes
Was the engine a 350? I cannot understand why anu drilling would be required if it is... I found out the hard way that a new flywheel ( SFI if high RPM's are expected) is cheap insurance when doing any engine or tranny work.
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#12 |
newly minted old timer
Join Date: Dec 1999
Location: Hudson WI
Posts: 3,513
|
Re: fly wheel drill holes
well i looked at the fly wheel they he took out. someone did drill it, i for sure doesnt look factory. this really shocks me, for being a low mile truck, that should not have ever had the trany out.
the condition of the trany, reason i rebuilt it, and the drilling on the flywheel, make me think at sometime, someone had the trany out. hum. seems to run much smoother now, but i have not had it on the highway.
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____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban |
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#13 |
Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Re: fly wheel drill holes
On my 383 they balanced the crank with the flex plate and front pulley then marked everything with two lines to match up how to assemble it.
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#14 | |
Never Ending Projects
Join Date: Jul 2006
Location: San Diego, CA
Posts: 3,836
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Re: fly wheel drill holes
Quote:
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. 1965 C10 Panel, ![]() 1968 Chevy C10, Long, Fleetside, Hot Rod Hauler http://67-72chevytrucks.com/vboard/s...d.php?t=313233 SOLD 1965 Chevy C10, Long, Fleetside, Hot Rod C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415702 SOLD We were given two ears and one mouth for a reason... listen twice as much and speak half as often... |
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#15 | |
Registered User
![]() Join Date: Jul 2007
Location: Toppenish, WA
Posts: 15,520
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Re: fly wheel drill holes
Quote:
Mtdave2 I have a half dozen Chev flex plates around here and some are drilled and some aren't. Is there by chance a counter weight welded to the other side of the flexplate? That would mean it was a 400 flexplate and would cause a vibration on a 350. A good quality 350 flexplate is usually under 40 bucks at most parts houses so it might ease your mind to just go and buy a new one. Extra heavy duty ones seem to run a bit under 100 bucks ea. t |
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#16 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: fly wheel drill holes
Mike, dave's truck was a genuine 20-something thousand mile (IIRC)truck when he got it. It spent it's life in a barn. He had sent me photos and the whole story probably 8 or 9 years ago. Assembly line stickers on the drums and everything.
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#17 | |
Never Ending Projects
Join Date: Jul 2006
Location: San Diego, CA
Posts: 3,836
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Re: fly wheel drill holes
Quote:
I just hate to hear when people buy a truck or car that the PO "claims" is xxx mileage when in fact they are leaving off the 1, 2 or 3 that should be the first number. Even worst when dealer do this crap. For me, I always assume when I see a 5 digit odo that there should be a 1 in front of it, unless I can see docs to prove otherwise.
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. 1965 C10 Panel, ![]() 1968 Chevy C10, Long, Fleetside, Hot Rod Hauler http://67-72chevytrucks.com/vboard/s...d.php?t=313233 SOLD 1965 Chevy C10, Long, Fleetside, Hot Rod C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415702 SOLD We were given two ears and one mouth for a reason... listen twice as much and speak half as often... |
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#18 |
newly minted old timer
Join Date: Dec 1999
Location: Hudson WI
Posts: 3,513
|
Re: fly wheel drill holes
there is something odd with the trany.. perhaps the guy i bought it from did the ol trany switch-a-ro when he was going to sell it... not sure..
just one of those odd things you run into..
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____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban |
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