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| Another Broken Flex Plate....HELP https://slantsix.org/forum/viewtopic.php?t=26481 |
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| Author: | 64A100 [ Thu Jan 03, 2008 2:42 pm ] |
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The crankshaft has a nose-1.960" OD. The adapter has a recess for that nose- 1.962". The torque converter side of that adapter/spacer (rear) has a nose which registers the flexplate and they fit nicely. That nose has a counterbore for the torque converter nose which fits as described above. An aside- crankshaft endfloat is .008". Is there a heavy duty/ rough service/ thicker adaptor plate available? Original flexplate (43 year old?) was .108" thick. Replacement was .088 thick. Don't know the material breakdowns however.. |
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| Author: | Jeffc [ Fri Jan 04, 2008 2:24 pm ] |
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After looking farther, I am guess I was wrong, there was a crank plate adaper used, and so stand corrected. what I found in the parts book after looking again... Adapter, drive plate (flex plate) 2202 472 Dowel, housing adaper 1533 923 Adjusting torkconverter .007" Center Distance 1736 347 .014" " " 1736 348 .021" " " 1736 353 does the crank adaper have a number stamped on it? 2202 472? the A727RG may have started in 69, however I have still found the adapter plate type in as late as 71 trucks |
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| Author: | 64A100 [ Mon Jan 07, 2008 8:34 am ] |
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But wait, there's more. When we do the math, it looks like when everything is put together, there is a small space (about .0040") between the flexplate and the torque converter. this is because the nose of the converter is longer than the depth of the counterbore in the crankshaft adapter. Should there be no gap at all betweeen the two? Also, the replacement flexplate that I used last time is .0020" thinner than the original one that was in the van. (but that one broke too). Ant thoughts before I put this all back together again? |
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| Author: | 64A100 [ Mon Jan 07, 2008 8:37 am ] |
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Sorry, that's a space between flexplate and converter of .040" and a difference of .020" between the 2 flexplates. |
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| Author: | Dart270 [ Mon Jan 07, 2008 9:37 am ] |
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Whoa. If I understand you correctly, you mean the converter nose bottoms out and you need to slightly bend the flex plate ears to get the bolts tight. I would imagine this could break a flexplate. Either grind down the TC nose by 0.060" (maybe just on edges?), or run 0.060" washers between the flexplate and TC pads, or deepend the hole in the crank adapter so the TC can go all the way in. This could definitely be your problem. Lou |
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| Author: | Charrlie_S [ Mon Jan 07, 2008 9:40 am ] |
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When the transmission is bolted to the engine, and the converter is "bottomed" in the trans, there should be a gap between the "pads" on the converter and the flexplate. The factory service manual does not give a dimension. The converter is then pulled to the flexplate, by hand, and the "pads" should be touching the flexplate. There should be no gap. |
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| Author: | SlantSixDan [ Mon Jan 07, 2008 9:58 am ] |
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Good suggestions from Dart270. I also wonder, since we're dealing with a V8 trans here, if one of the heavy-duty flex plates available on the market might be a wise investment...? |
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| Author: | Charrlie_S [ Mon Jan 07, 2008 10:22 am ] |
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Quote: Good suggestions from Dart270. I also wonder, since we're dealing with a V8 trans here, if one of the heavy-duty flex plates available on the market might be a wise investment...?
I don't know if that is a viable option. The bolt pattern on the slant crankshaft is different then the V-8. I am pretty sure the V-8 trans, still used the slant six flexplate.I think if the sugestions from Lou are utilized, it will cure the problem. One other thing is to use "blue" locktite on all the flexplate bolts. |
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| Author: | Dart270 [ Mon Jan 07, 2008 12:23 pm ] |
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Slant Six and V8 patterns are same except for one bolt hole is offset about 3/8". Just take the Slant plate and use as a template to drill a V8 plate you buy - SFI cert from Mopar or Mancini is about $40. Lou |
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| Author: | DionR [ Tue Jan 08, 2008 12:22 pm ] |
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Quote: Slant Six and V8 patterns are same except for one bolt hole is offset about 3/8". Just take the Slant plate and use as a template to drill a V8 plate you buy - SFI cert from Mopar or Mancini is about $40.
Could you do the same thing with an V8 flywheel?
Lou |
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| Author: | Wizard [ Tue Jan 08, 2008 12:38 pm ] |
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Torque converters slides back and forth on their splines and seals. The flexplate should not be pulled into the torque converter ears as one bolting this on. If is, you have wrong one or something is up. Cheers, Wizard |
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| Author: | Jeffc [ Wed Jan 09, 2008 3:50 pm ] |
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Quote: Quote: Slant Six and V8 patterns are same except for one bolt hole is offset about 3/8". Just take the Slant plate and use as a template to drill a V8 plate you buy - SFI cert from Mopar or Mancini is about $40.
Could you do the same thing with an V8 flywheel?Lou LA for many years that way without issue. However, if it was me I would get the hole filled before drilling the new one.... |
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