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#1
11-06-2008, 07:58 PM
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Pics of a Cracked Flex Plate
A few months ago, my buddy’s ’84 300D started making a harsh, disgusting metallic sound near the rear of the motor after first making a wooshing sound for thousands and thousands of miles. We peaked in the bellhousing window and confirmed what we thought. As shown in the first two pics.
Forward to today... The car had sat all this time and we finally pulled down the tranny. We found out that this transmission had been toyed with by the PO/or some joke mechanic and they used wrong bolts with 12mm heads on the flex plate instead of the original 13mm head bolts. Using these wrong bolts could of very well have caused this catastrophe. Check out this ugly pic! Pieces of the ugly flex plate and the new flex plate to be installed. Hope you enjoyed the pics.
__________________
1983 123.133 California - GreaseCar Veg System 
Last edited by DeliveryValve; 11-06-2008 at 08:40 PM. 
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#2
11-06-2008, 08:10 PM
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Yikes....after doing an engine swap, I don't even want to think about doing all that just to get to the flex plate.
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-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#3
11-06-2008, 08:44 PM
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Quote:
Here is more ugliness!
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1983 123.133 California - GreaseCar Veg System
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#4
11-06-2008, 08:50 PM
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What does the flex plate do?
-J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket  Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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#6
11-07-2008, 02:05 AM
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Quote:
Quote:
The engine, through the combustion process exerts a lot of vibration from the crankshaft to the flywheel. This vibration resonates to the engine block and on to the car’s body in which we hear as we accelerate up to speed. The Flex Plate dampens this vibration from the engine to the driveline and reduces the noise that we hear. As shown in the pic. The Flex plate is #48 and is shaped like a triangle. It bolts in the center to the crankshaft and flywheel (#46a), with the flywheel sandwiched in the middle of the crankshaft and flex plate. The torque converter bolts to the three outer points of the triangle shaped flex plate. As the engine spins and turns the torque converter, the flex plate flexes and dampens the vibration leading to the torque converter. .
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1983 123.133 California - GreaseCar Veg System
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#7
11-07-2008, 02:21 AM
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So all of the engine's power moves through the flex plate?
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#8
11-07-2008, 02:32 AM
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Yes..... It's hard to imagine a thin sheet of metal handling that power, but it does.
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1983 123.133 California - GreaseCar Veg System
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#9
11-07-2008, 02:36 AM
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Lol, it's really not that hard to imagine...I mean we're only talking like a max of 123hp?
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Current cars: 2000 ML55 AMG, 174k miles 2003 C240 T-Modell, 202k miles 1995 S320, 207k Miles
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#10
11-07-2008, 04:39 AM
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Quote:
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Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? As long as they would add one additional commandment for you to keep thy religion to thyself. George Carlin (Wonder where he is now..) 1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won. pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.
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#11
11-07-2008, 05:36 AM
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Quote:
Nice flex plate seminar, professor valvehead!
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 1981 300SD 512k OM603
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#12
11-07-2008, 10:19 AM
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Quote:
I don't think I can be called a professor... My sh#t is not piled high. Deep yet. 
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1983 123.133 California - GreaseCar Veg System
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#14
11-07-2008, 10:40 AM
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I bet mine is cracked since my gasser has so much power(148HP)
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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#15
11-07-2008, 10:54 AM
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If I understand the setup correctly the outer 6 bolts connect to one part and the inner 12 bolts connect to another and all of the power is transferred through the flex plate. Correct?
If so, Arinuts, it looks as if there was only one bolt of the outer six still working. When the last of the flex plate finally split the engine would be unable to provide power to the torque converter then then on the the transmission. There may not be any additional damage done as long as the engine did not overspeed as the flex plate parts are all external to the engine itself. But the failure in his case was probably going to happen soon. Cervan, assuming minimal flexure almost all of the force is being exerted along the plane of the flex plate. That they last so long already would indicate that it is sufficient for the purpose. In this case the failure point was not really in the overall plate but where the too small bolts attached it on the outer points. This would allow the plate to shift slightly and produce wear over the long run. I would not be surprised if the bolts were not properly torqued either.
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