[DeTomaso] Techno Question: Service life of poly-urethane bushings

[jderyke at aol.com]

Hi Chuck. What's likely happening is, the poly bushings are performing exactly as 'bushings'. The central metal sleeve is (or should be) locked against the frame tabs and the bushing rotates against it when the suspension moves. After a period without lubrication, some wear occurs in the softer of the two materials. Grease may help temporarily but if you can feel relative motion, harder material than grease is missing. If its annoying enough, the fix is to replace the sacrificial bushing. 18 yrs of life is impressive! Good luck- J DeRyke


-----Original Message-----
From: Charles Engles <cengles at cox.net>
To: 'List DeTomaso Forum' <detomaso at server.detomasolist.com>
Sent: Sat, Jun 30, 2018 2:57 pm
Subject: [DeTomaso] Techno Question: Service life of poly-urethane bushings


Dear Forum,



I installed poly-urethane bushings about
18-20 years ago. Now there seems to be a little bit of play in the
right front suspension without trauma or incident. The amateur
mechanics here suggest that the poly-urethane bushings are the main
suspects. Externally, they look fine. The left side is tight.


So, rubber bushings go bad over time
(decades?). Do poly-urethane bushings go bad over a similar time?
Is this a typical failure mode?



Warmest regards, Chuck Engles
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-------------- next part --------------
   Hi Chuck. What's likely happening is, the poly bushings are performing
   exactly as 'bushings'. The central metal sleeve is (or should be)
   locked against the frame tabs and the bushing rotates against it when
   the suspension moves. After a period without lubrication, some wear
   occurs in the softer of the two materials. Grease may help temporarily
   but if you can feel relative motion, harder material than grease is
   missing. If its annoying enough, the fix is to replace the sacrificial
   bushing. 18 yrs of life is impressive! Good luck- J DeRyke
   -----Original Message-----
   From: Charles Engles <cengles at cox.net>
   To: 'List DeTomaso Forum' <detomaso at server.detomasolist.com>
   Sent: Sat, Jun 30, 2018 2:57 pm
   Subject: [DeTomaso] Techno Question: Service life of poly-urethane
   bushings
   Dear Forum,
   I installed poly-urethane bushings about
   18-20 years ago. Now there seems to be a little bit of play in the
   right front suspension without trauma or incident. The amateur
   mechanics here suggest that the poly-urethane bushings are the main
   suspects. Externally, they look fine. The left side is tight.
   So, rubber bushings go bad over time
   (decades?). Do poly-urethane bushings go bad over a similar time?
   Is this a typical failure mode?
   Warmest regards, Chuck Engles
   _______________________________________________
   Detomaso Email List is not managed by POCA
   Posted emails must not exceed 1.5 Megabytes
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   list. They also grant the list owner permission to maintain an archive
   or approve the archiving of list messages.

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