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| View Poll Results: Which theory is true to cause bent rods? | |||
| Brian's Rock Theory |
   
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18 | 64.29% |
| Tom's Gasket Theory |
  
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10 | 35.71% |
| Voters: 28. You may not vote on this poll | |||
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#1
03-25-2008, 12:27 PM
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Rock Theory vs. Gasket Theory
Let the people decide and then call it a fact
 http://www.peachparts.com/shopforum/showthread.php?t=217243 Which theory do you support?
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'99 S420, 155k '91 VW Vanagon GL, 150k '85 VW Vanagon GL, 120k '82 VW Westy, aircooled, 165k Last edited by airbus; 03-25-2008 at 12:33 PM. 
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#2
03-25-2008, 12:28 PM
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oh come on... at least make it a poll...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#3
03-25-2008, 12:30 PM
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Quote:
__________________
'99 S420, 155k '91 VW Vanagon GL, 150k '85 VW Vanagon GL, 120k '82 VW Westy, aircooled, 165k
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#4
03-25-2008, 12:32 PM
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I think my rock theory is perfectly plausible.
Now, I don't have any evidence to support it..........but, pay no heed to that. When a person has a strong theory, facts and data are not required. 
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#5
03-25-2008, 12:32 PM
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what about the third option...
who cares? MB can't (won't) fix it right. the block is built so stretched that sleeves cannot be used, and $h!% happens...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#6
03-25-2008, 12:35 PM
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Quote:
Didn't Chevy run into problems with the 400 small block due to siamesed cylinders, necessitated by the larger bores?
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#7
03-25-2008, 01:35 PM
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the more common problem chevy ran into with the 400 block was when idiots put standard heads not drilled for the steam vents that the block required. that blew a ton of rebuilds. gave the 400 small block the bad rap of blowing head gaskets... very simple fix was drill out the steam holes in the head. our 400 in my 68 camaro race car has the devcon and a very slight honing with a destroked crank the baby puts over 1000HP to the crank! pushes our doorslammer into the low 9's high 8's.... only small block on the track that carries the front wheels 1/4 track!
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#8
03-25-2008, 01:36 PM
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The gasket theory has nothing supporting it whatsoever. The rock theory at least explains how the rock gets in there. Rock theory wins!
'87 560 SL 150,000 '94 SL 500 40,000 '91 350SD 515,000 Putting the air cleaner back in place to avoid aspirating rocks
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jcciem '94 SL5000 60,000 '91 350SDL 545,000 '91 350SD 197,000 '00 E55 AMG 77,000 Last edited by jcciem; 03-25-2008 at 01:43 PM.
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#9
03-25-2008, 01:36 PM
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Quote:
 Wow, that's close!
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" We have nothing to fear but the main stream media itself . . . ."- Adapted from Franklin D Roosevelt for the 21st century  OBK #55 1998 Lincoln Continental - Sold Max 1984 300TD 285,000 miles - Sold The Dee8gonator 1987 560SEC 196,000 miles - Sold Orgasmatron - 2006 CLS500 90,000 miles 2002 C320 Wagon 122,000 miles 2016 AMG GTS 12,000 miles
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#10
03-25-2008, 01:40 PM
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oh, I forgot to vote.
always side with Brian when it comes to MB Diesel tech!
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#11
03-25-2008, 02:02 PM
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I'd say that bad forgings and metal fatigue are as viable as any. Even if hydrolock were to occur (or a rock), why would it favor the same side of the forging to yield? Are the rods "handed"? Is there a forward and rearward side?
Not to throw any real thought process into this or anything. Has anyone looked it up in the FSM? The head gasket problems and casting issues in the early 60x engines are discussed there.
__________________
 Gone to the dark side - Jeff
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#12
03-25-2008, 03:23 PM
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Rock theory confirmed!
Luckily I discovered the rock just before it was aspirated into the turbo! Well I guess it's case closed. Roick theory observed and confirmed in a real
'91 350SD just on the verge of rod bending! See attached pictures. '87 560SL 150,000 '94 SL500 40,000 '91 350SD 515,000 Caught just in time before aspirating a rock and bending a rod. Wow was that close!
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jcciem '94 SL5000 60,000 '91 350SDL 545,000 '91 350SD 197,000 '00 E55 AMG 77,000
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#13
03-25-2008, 03:32 PM
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Quote:
__________________
'99 S420, 155k '91 VW Vanagon GL, 150k '85 VW Vanagon GL, 120k '82 VW Westy, aircooled, 165k
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#14
03-25-2008, 03:40 PM
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The lack of any supporting data is not relevant. I know that it's true and I'm sure everybody will believe me.
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#15
03-25-2008, 04:23 PM
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Quote:
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