question about air filter can isolaters - PeachParts Mercedes-Benz Forum

rebreath · #1 07-01-2007, 12:16 AM

Can anyone give me an idea of how long those little "shock absorbers" under the air filter can are supposed to last?I installed some recently purchased(about 6-8 weeks ago,from here in fact) new ones and all three have died already!.I installed them about a month ago.any insights or suggestions for a quick repair until i can replace them with the same or something that I will create.Or better yet any ideas on repairing them?the metal tabs with the bolt portion have separated from the rubber itself.thanks for any insights

ps-engine does not vibrate much at all.running quite smoothly actually and with no excessive vibration

#2 07-01-2007, 01:40 AM

Did you install heat shields? They do not last very long without the heat shields (ask me how I know):

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1CQ0J3JZ424F01ETLO&year=1985&make=MB&model=300-DT-001&category=All&part=Mount+Heat+Shield

toomany MBZ · #3 07-01-2007, 04:38 AM

I've got some from here, as a back up. Haven't used 'em yet. Made in China. The shields Craig brought up, I don't use, can trap water. All the ones I've replaced, no problem. None of those were made in China, as far as I know.

tangofox007 · #4 07-01-2007, 10:32 AM

Quote:

Originally Posted by toomany MBZ

shields Craig brought up, I don't use, can trap water.

And you sure don't want your car to become a mosquito breeding ground!!!

Why do heat shields have drain holes?

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=23H0N2A6324F0KUJA8&year=1983&make=MB&model=300-DT-001&category=B&part=Mount+Heat+Shield

rebreath · #5 07-01-2007, 10:56 AM

yup,used the shields as well.also were new,still very shiny and bright.so, in combo with the shields what should be the expected life span of one of these things.All three have separated the bolt and plate it is attached to from the rubber shock itself.seems to me that they should last a bit longer than a month,right.The ones that I was replacing looked original(probably not,but they looked quite old) and were not completely separated but I changed them anyway.

kerry · #6 07-01-2007, 11:01 AM

Replaced mine about a year ago and they're still fine.

hendey · #7 07-01-2007, 11:18 AM

I fixed mine 4 years ago with sections of heater hose filled with rtv silicone.

#8 07-01-2007, 11:39 AM

Quote:

Originally Posted by rebreath

yup,used the shields as well.also were new,still very shiny and bright.so, in combo with the shields what should be the expected life span of one of these things.All three have separated the bolt and plate it is attached to from the rubber shock itself.seems to me that they should last a bit longer than a month,right.The ones that I was replacing looked original(probably not,but they looked quite old) and were not completely separated but I changed them anyway.

I don't know why they failed, is it possible you over-tighted them enough to twist the rubber off the baseplate when you installed them? I think I bought mine at the dealer (quicker) but I don't remember their markings. Use the heat shields, I don't understand the "trapping water" concern, they do have little drains and I've never found one full of water.

lefttownlance · #9 07-01-2007, 11:47 AM

What is tearing them up????? Bad idle???Somthing is shaking them apart

rebreath · #10 07-01-2007, 11:47 AM

Quote:

Originally Posted by Craig

I don't know why they failed, is it possible you over-tighted them enough to twist the rubber off the baseplate when you installed them? I think I bought mine at the dealer (quicker) but I don't remember their markings. Use the heat shields, I don't understand the "trapping water" concern, they do have little drains and I've never found one full of water.

doesnt seem likely,but the nuts are small so it is possible that I overtightened them.Just seems that even overtightening would not kill them due to the fact that when snug they are using the rubber as it is meant.as an isolater.There is a plate that snugs to the bottom so they cannot be pulled out by the nut.maybe I just got faulty ones.guess I will replace again and then take now broken ones to drill press and see what I can do to fix and prevent from happening again.

Am thinking maybe hole through bolt-rubber-bolt,then threading small cable or wire through and tacking in place somehow.

rebreath · #11 07-01-2007, 11:49 AM

Quote:

Originally Posted by lefttownlance

What is tearing them up????? Bad idle???Somthing is shaking them apart

not sure what did it.engine runs very smoothly.IE very little vibration.my friends diesel truck vibrates much more as meant apparently.I am thinking that I just got a bum set.so I will try again and then try something creative with the old ones

toomany MBZ · #12 07-01-2007, 06:55 PM

The shields I own don't have drian holes...PER SE, maybe do so via hole for mounting bolt. Trap heat to speed rubber degdradation? Took 'em out, haven't looked back, no problems so far. TF, plenty of 'squitos to go around! rebr... should not have to alter mounts. Good luck with new mounts...I have several ones made in China!

rebreath · #13 07-01-2007, 07:24 PM

looks like it is a case of dry rot!The rubber is disintegrating in my hand.these were new!will try again but I think that a mod is in order here.