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Old 07-07-2012, 09:02 PM   #1 (permalink)
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CNC reservoir Is This OK?

I took the tops off my CNC reservoirs to polish them and found what looks like green paint on the inside?? Is this OK to leave on, or was it suppose to be removed before shipping? Will brake fluid affect it? I assume it was some sort of heat protection for welding the bracket to the back of the reservoirs.

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Old 07-08-2012, 12:10 AM   #2 (permalink)
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I can honestly say that I have never seen that before.. I'll have to take a look inside mine when I get to the shop next week.
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Old 07-08-2012, 12:28 AM   #3 (permalink)
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I took the tops of mine off to polish also, but I don't remember seeing anything like that. As corrosive as brake fluid is, I'd hate for it to be broken down and contaminate the fluid. I'd find some way of getting rid of it.
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Old 07-08-2012, 12:53 AM   #4 (permalink)
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Green Inside

I am pretty sure mine look the same inside. They do polish up nicely.

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Old 07-08-2012, 03:15 AM   #5 (permalink)
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Nothing like that in mine either. The inside of the CNC reservoirs I bought are plain aluminium and clean. I just went out and checked inside both to confirm. I agree perhaps is something left over from the mfg process? I also agree it should be removed on the chance it could contaminate the brake fluid. Have you tried cleaning it out with anything, including brake fluid itself?
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Old 07-08-2012, 03:19 PM   #6 (permalink)
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Same green goo ....

Thanks Tom for letting us know what you found.

I've got "green goo" in at least one "cell" of my CNC reservoir as well. Tried to scrape it gently with the tip of a screw driver with no success. Stuff is really hard ... and thicker (I think) than just some sort of paint

Looked at the CNC Inc web site and they have no listed way to send them an email (w/attached picture) to ask about it.

So I'll try to give them a call on Monday and ask them ... will post up what I learn, and hopefully a way to get it out.

Lynn
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Old 07-08-2012, 03:53 PM   #7 (permalink)
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Originally Posted by lynnhowlyn View Post
Thanks Tom for letting us know what you found.

I've got "green goo" in at least one "cell" of my CNC reservoir as well. Tried to scrape it gently with the tip of a screw driver with no success. Stuff is really hard ... and thicker (I think) than just some sort of paint

Looked at the CNC Inc web site and they have no listed way to send them an email (w/attached picture) to ask about it.

So I'll try to give them a call on Monday and ask them ... will post up what I learn, and hopefully a way to get it out.

Lynn
OK thanks Lynn.....and don't forget to take the tops off all the reservoirs. I found the instructions stuffed in the center reservoir.

Tom
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Old 07-08-2012, 11:38 PM   #8 (permalink)
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OK thanks Lynn.....and don't forget to take the tops off all the reservoirs. I found the instructions stuffed in the center reservoir.

Tom
Yep - "instruction sheet" in the center reservoir. Who'd a thunk instructions were needed ... but then again, I'm not a product liability specialist.

Good news is I got the instructions out so they won't get all mushy with brake fluid and block lines etc when I fill them and start bleeding the brakes.

And "green goo" is in all three little buckets ......

Thanks

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Old 07-09-2012, 04:48 PM   #9 (permalink)
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Green stuff "supposed" to be there .....

I just got off the phone with a nice lady and CNC Inc in San Diego (619-275-1663), who seemed very knowledgeable about the green stuff (sorry but I didn't get her name).

She said the green stuff is some "extra sealing" material that's put into all of their remote reservoirs to help guard against any leakage, and that it should NOT be removed. It is applied principally to the wall of the "box" where it's welded to the bracket.

She said it won't dissolve in brake fluid nor cause any harm or difficulties to the braking system.

HTH

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Old 07-09-2012, 05:40 PM   #10 (permalink)
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Thanks for checking!
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Old 07-09-2012, 06:17 PM   #11 (permalink)
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Interesting! It sounds like something they started recently based on the posts. Thanks for checking Lynn.

Tom
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Old 07-09-2012, 11:15 PM   #12 (permalink)
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Ouch! The idea of putting in a "sealant" to keep potential weld-related cracking, through the wall, in a part that costs as much as this is just wrong! I've got them too, but my faith in CNC just took a nose dive.
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Old 07-09-2012, 11:35 PM   #13 (permalink)
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Not necessarily , the automotive industry has been using a sealing process for aluminum and cast parts for a long time. Transmission cases and even engine blocks. But they usually dip the part under a vacuum to force the sealer into the pores of the casting. Had an ex brother-in-law who sold the sealers. If the right sealer is used they are impervious to heat and automotovie fuels and solvents.

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Old 07-11-2012, 12:01 AM   #14 (permalink)
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The wall of that reservoir is pretty thin so I bet they had a few pinholes at the welds for the brackets. The sealer looks like a good solution to me. A week or so ago I cut off and welded back on a hose nipple on an aluminum radiator. Was real careful w/ the welds but there is a tiny seepage at the top.Just enough to make a small trail of dried coolant down the tank but not enough to cause a drop in coolant level. Wish I knew what that sealer was!
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Old 07-11-2012, 09:22 PM   #15 (permalink)
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From Carroll Smith (RIP), one of my favorite sources:

Loctite Green (690) to fill porosity in welds, casting and powder metal parts.

The green wicks into place. Also use it to "Loctite" nuts and bolts after assembly.

I wouldn't think you would have to apply it on the inside though.
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Old 10-17-2012, 05:39 PM   #16 (permalink)
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Quote:
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Ouch! The idea of putting in a "sealant" to keep potential weld-related cracking, through the wall, in a part that costs as much as this is just wrong! I've got them too, but my faith in CNC just took a nose dive.
I've lost my faith in them. I spent alot of money on their product, and my front resevoir is leaking. There is no green sealant on mine, so obviously this is a problem they have noticed. I called them up and spoke to them just now and she said, "they rarely have problems with their products leaking" and now wants me to pay to ship the product back to them so they can "take a look at it". I tried to get them to send me a pre paid label and she wouldnt do it.
So now I have to take apart my system, pay to ship it to them, HOPE they warranty it, then have to go through the bleeding process all over again. BS is you ask me.
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Old 10-17-2012, 07:49 PM   #17 (permalink)
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I've lost my faith in them. I spent alot of money on their product, and my front resevoir is leaking. There is no green sealant on mine, so obviously this is a problem they have noticed. I called them up and spoke to them just now and she said, "they rarely have problems with their products leaking" and now wants me to pay to ship the product back to them so they can "take a look at it". I tried to get them to send me a pre paid label and she wouldnt do it.
So now I have to take apart my system, pay to ship it to them, HOPE they warranty it, then have to go through the bleeding process all over again. BS is you ask me.
That is poor customer service if you ask me. My guess is that they won't be selling many more of these now that FFR has finally upgraded to a much nicer SS setup. Luckily I haven't had any problems with mine and I have my fingers crossed that I won't.
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