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Biodegradable Plastic Can't Take the Heat

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Pubudu
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Re: Inappropriate materials
Pubudu   12/25/2013 12:09:57 AM
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True a.saji, Sometimes this is the main issue when repairing the old vehicles or the antiques vehicles. 

Pubudu
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Re: Inappropriate materials
Pubudu   12/24/2013 11:12:06 PM
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Bill this is a known issue in the history, I know some agents replace this parts for the all the cars that they have sold to the customers under there expenses. 

wbswenberg
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Re: My 94 Toyota truck has been biodegrading since I bought it.
wbswenberg   12/20/2013 11:14:45 PM
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A couple of years ago I finished breaking apart the interior of my '84 HiLux 4X4.  The arm rests and door panels are ok but the sides and back of the cab of hard molded plastic was removed.  I have almost as many miles on the second engine as the first 175K vs 265K.  

Had problems with a plastic keeper on my '95 K2500 for the clutch.  Turns out that it was failing cause the clutch was worn out.  Next time it will be a tow truck clutch as I haul a camper around 100% of the time.

I'm partly rebuilding the K2500 350cid engine.  Cylinders #6 & 8 have exhaust valve pitting in the seating area.  #6 had no compression.  #8 had 100 psi increasing to 145 with oil.  The right bank still had swirl marks from honing.  And #6 intake valve head was smaller than #8 guess the wrong part got into the assembly.  Made by monkeys I guess.  Lost my train of thought.  The valve stem seals broke off and the valve stem seals were hard.  Different kinds between intake and better sealing exhuast.  Interesting change.

 

Hilly-Billy-13
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Iron
Re: that explains it
Hilly-Billy-13   12/20/2013 5:04:31 PM
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the"biodegradable"plasticsaffectedalloftheeuropeancarsfromthe80'son,volvo240softhaterahavemoreissuesbecausethecoolingfanisdrivenbytheenginesothetempsbuildupaftertheengineshutsdown.vw'sbyusinganelectriccoolingfandon'thavetheissueasbad,butit'sstillpresent.howevertheelectrical&electronicsophisticationofmy1980vwrabbitwithi'sdieselengineissuchthatit'sanoneissue.
 
havingowned2englishsportscars,andworkedonothers,i'llskipthelucaselectricjokesfornow.
billhigdon

engineerBob
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Iron
that explains it
engineerBob   12/20/2013 4:00:57 PM
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That explains all the gremlins in my Mercedes! 

Bryan Goss
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Gold
Re: My 94 Toyota truck has been biodegrading since I bought it.
Bryan Goss   12/20/2013 2:01:39 PM
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Well for sure the parts that came with it when I bought it new were from Toyota, and all the replacement parts have been from the Toyota dealers. Granted they may be old stock at this point that was made back when the truck was made. I hope they keep them in a cold storage facility!

bigpaws
User Rank
Iron
Re: My 94 Toyota truck has been biodegrading since I bought it.
bigpaws   12/20/2013 1:41:18 PM
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I wonder about the provenance of your plastic parts considering their behavior and the time-frame of the build.

 

Cheers

 

Bill

 

bigpaws
User Rank
Iron
Re: Biodegradable Plastic
bigpaws   12/20/2013 1:23:57 PM
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Yup.  Youre intuition is correct.  All of the plastic will biodegrade at some point, but, it's accelerated in the engine compartment due to heat.  In the case of the Mercedes, they had one minor flash of forethought in that the engine harness is a sub-harness of the whole system - connected to the main harness via connectors. You still have to dig all throught the thing to replace it, but, at least there's no soldering needed.

 

Bill

 

Bryan Goss
User Rank
Gold
My 94 Toyota truck has been biodegrading since I bought it.
Bryan Goss   12/20/2013 11:57:36 AM
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My truck has been parked outside in the sun for most of it's 19 years in Los Angeles. It started degrading within a couple years of the time I bought it new, and at this point I have replaced most of the hard plastic parts in the cab at least once. The plastic just crumbles away. Thankfully it does not include the insulation of the wires, but does include door handles, door latches, trans linkage, window knobs, dash board, dome light, etc. Just more planned obsolescence as far as I can see.

Mydesign
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Platinum
Re: Inappropriate materials
Mydesign   12/20/2013 12:24:09 AM
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1 saves
"We often had problems with hoses and seals (among many other problems).  It turns out that the British were still using natural rubber and that it did not hold up as well as synthetic rubber."

Naperlou, I understood that heat bearing capacity of natural rubbers is very low. We have rubber plantation and during drying process, some of them get melted. By adding other components to make synthetic rubber can increase their thermal withstand levl.

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