Re: 727 Turbo Action T/C contacts flexplate to crankshaft bolts
[Re: B5496RR]
#2186406
10/31/16 01:30 AM
10/31/16 01:30 AM
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Joined: Nov 2004
Posts: 6,890 North Alabama
Monte_Smith
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master
Joined: Nov 2004
Posts: 6,890
North Alabama
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Common problem with some converter cores, T/As being one of them. If you don't have the thin head bolts in the flexplate to crank, you need some. If you have the thin head bolts and it's still bottomed out, you will need a washer between pads and flexplate to space converter back a bit.
The snout wear is likely BECAUSE the converter is bottomed out on flexplate
Last edited by Monte_Smith; 10/31/16 01:32 AM.
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Re: 727 Turbo Action T/C contacts flexplate to crankshaft bolts
[Re: B5496RR]
#2186912
10/31/16 07:27 PM
10/31/16 07:27 PM
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Joined: Jan 2003
Posts: 25,783 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
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Posts: 25,783
Rio Linda, CA
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The fretting at the pump rotor surface is disturbing and suggests that the two contacting surfaces are experiencing a cyclic motion. Uneven pull up caused by the crank bolts?
The INTERNET, the MISinformation superhighway
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Re: 727 Turbo Action T/C contacts flexplate to crankshaft bolts
[Re: hankcrank]
#2187197
11/01/16 02:23 AM
11/01/16 02:23 AM
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Joined: Nov 2004
Posts: 6,890 North Alabama
Monte_Smith
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North Alabama
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Is it possible the converter was built for a mid plate application and you don't have one and that is why you have a clearance problem? The opposite actually. If made for a mid plate, the snout would have a spacer and would either have been sent with spacers and or thicker pads. Both of which would space the core from the flexplate bolts. Remember, the flexplate is where it is and the converter has to be engaged in the pump lugs. So with a midplate the whole trans is back further and converter has to still engage lugs. This creates space between converter and plate so you fix it with longer snout and thicker pads.
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Re: 727 Turbo Action T/C contacts flexplate to crankshaft bolts
[Re: B5496RR]
#2188272
11/02/16 08:22 PM
11/02/16 08:22 PM
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Joined: Jan 2003
Posts: 6,531 Jacksonville, FL
Chris2581
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Jacksonville, FL
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We've been using Turbo Action stuff since 1977. I've always used a small washer between the flexplate and converter pads and have never had any problems.I also use the bolts that Turbo Action sells for the flexplate to crank and converter to flexplate.
Nautilus Racing- We use Superformance gaskets and Turbo Action converters/products.
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Re: 727 Turbo Action T/C contacts flexplate to crankshaft bolts
[Re: B5496RR]
#2188734
11/03/16 02:23 PM
11/03/16 02:23 PM
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Joined: Jan 2005
Posts: 4,406 Michigan
MarkZ
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Worthy
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Posts: 4,406
Michigan
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I'm running a 10" Turbo Action converter with a 360/518 combo and haven't run into any issues in the six years it has been in the car. I did use bolts supplied by T/A though.
1987 Fifth Avenue - 512/518/D60
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Re: 727 Turbo Action T/C contacts flexplate to crankshaft bolts
[Re: Monte_Smith]
#2188810
11/03/16 03:57 PM
11/03/16 03:57 PM
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Joined: Mar 2004
Posts: 231 USA
B5496RR
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Thanks everyone. I'm already using the correct thin head bolts. I guess I will have to shim the converter with washers. However, I dont like this method and never had to do this with any other 727 brand converter... Seems like a Band-Aid fix to me One would think that instead of asking the customer to shim the converter that the core would be machined to correct this or a different core would be used by the converter company.
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Re: 727 Turbo Action T/C contacts flexplate to crankshaft bolts
[Re: Monte_Smith]
#2189348
11/04/16 12:09 PM
11/04/16 12:09 PM
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Joined: Mar 2004
Posts: 231 USA
B5496RR
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I wanted to cover all possible variables that could cause this problem for me before reassembly. I performed the following of the parts I had on hand. Flexplate: All flexplates had the same offset B&M 10230 TCI 145200 Mopar Perf (Part Number unknown) Torque converters: Dynamic 9.5" 4200 stall Turbo Action 10" 3800 stall B&M 10" 3500 stall Only the Turbo Action converter comes anywhere near contacting the flexplate to crankshaft bolts. See pics of B&M and Dynamic converters below. Note: There are no witness marks where the converter contacted the flexplate bolts, this is the same vehicle, same Engnie/Trans combo. The bolts Turbo Action recommends is a joke, a milled bolt pictured below that I never should have installed. The ARP thin headed bolts will now be reinstalled. Bolt head measurement: T/A bolts - .188-.198 ARP bolts - .204 Stock (non-milled bolt) .250 So not only does T/A recommend to run this compromised bolt but you also may have to add washers Seriously!! There is nothing mentioned in the instructions from B&M or Dynamic stating anything of the sort and its not needed with these brand coverters either. I will say that the T/A converter did work as designed when installed despite the leak concern. However, I think its time T/A heads back to the drawing board on converter cores.Most websites dont even mention the need for a different bolt or washers. So I would only assume many people buy the converter, read the instructions only to find out they now need to order a custom flexplate bolt and also need to head to the hardware store from some washers. This is something I would expect to be doing on a farm truck or tractor that one is cobbling together.
Last edited by B5496RR; 11/04/16 12:21 PM.
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