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  #1  
Old 02-12-2007, 10:51 PM
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spraying the rear axle boots

I just went through changing 2 axles because the boots were both split on my 84 240d. I noticed both on my 1980 300d dried and ready to split. Is there a spray treatment that can be used to make them more plyable and give it a longer life. I know there is a rubberized spray used to line trunks etc. Is anyone familiar with it. Do you think it would work. RAY M

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  #2  
Old 02-12-2007, 10:54 PM
t walgamuth's Avatar
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i would be careful what i spray on them.

they will keep going with shallow cracks on them for a good while, but keep checking them.

tom w
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  #3  
Old 02-12-2007, 10:56 PM
ncof300d
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I used to buy pure silicon spray. It works wonders for many thing, but today I can not find a place to buy it.
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  #4  
Old 02-12-2007, 10:57 PM
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Quote:
Originally Posted by ncof300d View Post
I used to buy pure silicon spray. It works wonders for many thing, but today I can not find a place to buy it.
never heard of that do you think it would help.
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  #5  
Old 02-12-2007, 11:03 PM
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Ray, Funny you should ask that question right now; I've been toying with the idea of cleaning the boots, and as someone spins the wheel slowly while off the ground, laying under the car and applying (with a small paint brush I think) that rubber stuff that you dip your tool handles into. The spinning would have to continue for some time as it would take a bit for that stuff to set up and not drip. I have used it before with great results for other little projects - none of which involved tool handles. I would like others to chime in and give their opinions/ideas on the matter. MATT
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  #6  
Old 02-12-2007, 11:27 PM
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split-boot

Someone needs to manufacture a split-boot for these cars. The kind you glue on. Any rubber part manufacturers listening?
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  #7  
Old 02-12-2007, 11:33 PM
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Applying rubber to the boot won't help unless the added rubber is stronger than the boot itself. Otherwise it will just let the boot crack. You won't get stronger rubber without heat. Forget about it.

Split boots are junk. Even if you do manage to get it glued in the presence of the grease (not an easy task), they won't work nearly as well as the OEM device. Forget about these too.

Silicone spray may indeed help, if the cracks are not very deep. But if there are any cracks at all, you're in for a new boot sometime. Best do it before it gives out, or at best you'll have to dismantle the joint to clean out the dirt.
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  #8  
Old 02-12-2007, 11:47 PM
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I have sprayed silicone lube on CV boots when I remember over the years. Always figured that it would help preserve the rubber? I've never had a CV boot go bad from this. Never use a petroleum product like WD40 though. RT
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  #9  
Old 02-12-2007, 11:55 PM
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Quote:
Originally Posted by rwthomas1 View Post
I have sprayed silicone lube on CV boots when I remember over the years. Always figured that it would help preserve the rubber? I've never had a CV boot go bad from this. Never use a petroleum product like WD40 though. RT
Spray silicone uses a petroleum base solvent. Anything that you might use on the boots might actually attack the rubber and shorten the life. My '77 has the origionals and 30 years is pretty good service if you ask me.
On my '55 vw I used to be able to buy the good factory German split boots. They could last 15 years or so before replacement. The ones I am able to buy now, aftermarket, German made will only last 3 years before cracking and leaking. Must be different rubber compound.

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  #10  
Old 02-13-2007, 01:24 AM
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New boots are good for about 20 years so your '84 is due. I doubt that there is anything that would stick well enough to 22-year-old rubber to be of any help but if I were in such a situation as you describe, I'd try the tool dip stuff. Let us know how it works out.
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  #11  
Old 02-13-2007, 01:33 AM
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Try 303 Aerospace spray protectant. RV places usually carry it. They use it for wheel protection. A new set of tires for the very large RV's can cost $12,000.00. So the 303 is a pretty cheap $$ saver.

I use it on my cars.

Dave

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  #12  
Old 02-13-2007, 06:25 AM
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Exclamation I have asked this question before......

I looked for my posting from sometime around last September.....and could not find it.....however someone did reply with a product that was recommended....I think it was some sort of "3M Undercoating" don't remember the part #.......

Sorry, I never got around to purchasing that product, so I have no further info......

SB
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  #13  
Old 02-13-2007, 07:21 AM
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Quote:
Originally Posted by Motorhead View Post
Spray silicone uses a petroleum base solvent. Anything that you might use on the boots might actually attack the rubber and shorten the life.


...and that's the correct answer. The use of silicone on rubber is a mistake. There are specific products developed for protecting and treating rubber.
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  #14  
Old 02-13-2007, 07:39 AM
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I have seen someone elses post on this forum stating that they covered their CV boots with that tool handle dip stuff. They said it had been three years and the boots were just fine.

A local car shop told me to fill in the cracks with standard black silicone sealant, as this would help preserve the boot. Thoughts?

I thought I would try the tool dip stuff, and report back. The way you guys are talking I need new boots soon.
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  #15  
Old 02-13-2007, 09:13 AM
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not necessarily.

they will run for years with surface cracking. i wouldn't worry til it starts leaking. then i would just replace the half shaft with a good rebuilt unit. the labor will be the same as for just doing the boots.

just mho.

tom w

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..I also have a 427 Cobra replica with an aluminum chassis.
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