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Help-3 tiny rust bubbles on my DOGLEG,how do I stop it from getting bigger?MG

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Help-3 tiny rust bubbles on my DOGLEG,how do I stop it from getting bigger?MG
#1
ski.dive Avatar
ski.dive Fred M
FL & VT, FL & VT, USA   USA
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1979 MG MGB MkIII
My MGB has 3 very tiny rust bubbles on the DOGLEG

How do I stop the rust now from getting bigger?

I do not want to change the dogleg, the tiny rust bubbles are minimal.MG

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Re: Help-3 tiny rust bubbles on my DOGLEG,how do I stop it from getting bigger?MG
#2
LmBoise Avatar
LmBoise Gold Member Louis Miller
Boise, ID, USA   USA
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1963 MG MGB
Fred,
It would be good to see a picture of the bubbles. While I am far from an expert on this one, my experience is that the bubbles are coming from the backside. The dog legs I have had to replace have had setiment trapped on the backside and the rust originated from the backside. By the time it bubbled on the front, the surrounding area was very thin due to rust and ready to break through. I would be curious to know what someone with more experience thinks on how to repair. The only real, permanent solution for me was to cut out the bad and replace.

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Re: Help-3 tiny rust bubbles on my DOGLEG,how do I stop it from getting bigger?MG
#3
Gerry Avatar
Gerry Gerry Masterman
Prairieville, LA, USA   USA
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Sad news but the truth is that it is already too late. By the time you see tiny bubbles in the exterior the rust has already eating out much larger holes under the paint. The only fix is to replace bad metal with new

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Re: Help-3 tiny rust bubbles on my DOGLEG,how do I stop it from getting bigger?MG
#4
tvrgeek Silver Member Scott S
Hillsborough, North Carolinia, USA   USA
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1973 Triumph Stag
Gerry is right. If you had access like on the front wings, I have another "modern chemistry" fix, but the rear, well it rusts from the inside out.
It may also mean you have hidden damage in the inner sills. They seem to go together.

Welcome to the foils of the first uni-body they built before they understood these issues.


Cogito ergo sum periculoso

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Re: Help-3 tiny rust bubbles on my DOGLEG,how do I stop it from getting bigger?MG
#5
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oleanderjoe Platinum AdvertiserAdvertiser Joseph Baba
Fresno, CA, USA   USA
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1962 Triumph Spitfire 4 (MkI) "SPITTY"
PENNZOIL STICKER. Pretend you are a racer.


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Re: Help-3 tiny rust bubbles on my DOGLEG,how do I stop it from getting bigger?MG
#6
mgbanthony Avatar
mgbanthony Platinum Member Anthony Henderson
Eastern Thousand Islands, ON, Canada   CAN
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1962 MG MGB
1974 MG MGB
You can get rid of the 3 bubbles by sanding them away....guaranteed you will have one much larger bubble, or hole after this process...spinning smiley sticking its tongue out

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Re: Help-3 tiny rust bubbles on my DOGLEG,how do I stop it from getting bigger?MG
#7
rocannon Avatar
rocannon Gold Member rocannon L
Comanche County, OK, USA   USA
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1967 MG MGB GT "GT From Hell"
JBWeldmoondevil smiley


Pogo is right.
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The power of reasons is an illusion. The belief will not change when the reasons are defeated. The causality is reversed. People believe the reasons because they believe in the conclusion.

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Re: Help-3 tiny rust bubbles on my DOGLEG,how do I stop it from getting bigger?MG
#8
jimb Avatar
jimb Jim Brown
San Francisco Bay Area, USA   USA
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1958 MG Magnette
1967 MG MGB
Like others have said, it is really to late to stop it, but you might be able to slow down the rot by drenching the gap between the sill and the wing with something like Penetrol (JDW introduced us to the rust preventative properties of that stuff so many years ago). You can remove the side trim panel behind the seat and there's an access cutout.


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Re: Help-3 tiny rust bubbles on my DOGLEG,how do I stop it from getting bigger?MG
#9
Rick Fawthrop Avatar
Rick Fawthrop Gold Member Richard Fawthrop
Langley, WA, USA   USA
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1960 Austin-Healey Bugeye Sprite
1974 MG MGB
1994 Mazda Miata
You need to do something that is hard for me to do. Ignore the bubbles.

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Re: Help-3 tiny rust bubbles on my DOGLEG,how do I stop it from getting bigger?MG
#10
HoosierMGB Avatar
HoosierMGB Gold Member Steve Koller
South Bend, IN, USA   USA
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1976 MG MGB
Sadly, there is only one way to stop it getting bigger: get an angle grinder and....well, I think you know where this is going. Once you start it will become very apparent that the bubbles are masking a sad and extensive web of rust that is just starting to show through from the inside. These cars truly rust from the inside out. Ask me how I know...sad smiley

Best of luck,

Steve


"Make no little plans; they have no magic to stir men's blood"
Daniel H. Burnham, Architect

1976 MGB - pretty much stock but with a few sundry deviations

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Re: Help-3 tiny rust bubbles on my DOGLEG,how do I stop it from getting bigger?MG
#11
Perambulator David D
Phoenix, AZ, USA   USA
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Easy fix. Just buy the right sunglasses:

Joo Janta 200 Super-Chromatic Peril Sensitive Sunglasses


Quote: The Joo Janta 200 Super-Chromatic Peril Sensitive Sunglasses have been designed to help people develop a relaxed attitude to stress They follow the principle \"what you don't know can't hurt you\" and turn completely dark and opaque at the first sign of anything distressing. This prevents you from seeing anything that might alarm you. This does, however, mean that you see absolutely nothing, including where you're going."



Edited 2 time(s). Last edit at 2017-05-01 02:07 PM by Perambulator.

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Re: Help-3 tiny rust bubbles on my DOGLEG,how do I stop it from getting bigger?MG
#12
dawvid Avatar
dawvid David B
Sharon, MA, USA   USA
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1974 MG MGB GT
Fred,

look inside the wheel well to see if there is any corrosion where water and debris can get in behind the bubbling area on your dogleg. If it looks solid, then that's a positive indicator. Use a screwdriver or ice pick as a probe along with a flash light.

Also, take a magnet and see if there has been any previous repair work (bondo) done around the dogleg. You can also tell by looking at the spot welds on the bottom of the dogleg area. If there has been previous repair work, then that says to me that it was not done properly.

Also, use an ice pick or something similar to poke into the rust bubbles. If it goes in, It should only go in about 1/4 inch or less meaning that it's hitting the inner rocker panel. That would be a good sign.

As others pointed out, it usually starts from the inside and works it's way outwards.

Hope this helps a bit,

David


74 Damask Red BGT
Davesmg@outlook.com

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Re: Help-3 tiny rust bubbles on my DOGLEG,how do I stop it from getting bigger?MG
#13
barry s Avatar
barry s Barry Stoll
Alexandria, VA, USA   USA
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1972 MG MGB GT
1974 MG MGB
1976 Triumph TR6
1980 MG MGB
You do have limited access to the inside of the dog leg. Remove the rear side trim panel (of course that means removing the top/hood frame mounting!) and look down between the trumpet and the fender. This is very limited. Rust proofing can be injected here, perhaps to no avail.

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Re: Help-3 tiny rust bubbles on my DOGLEG,how do I stop it from getting bigger?MG
#14
rntanner Avatar
rntanner Roger N. Tanner (Disabled)
Oxnard, CA, USA   USA
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1970 MG MGB
1977 MG MGB
Moss can sell you a repair part:

http://www.mossmotors.com/Shop/ViewProducts.aspx?PlateIndexID=29037#35

Go down the page to #35


Roger N. Tanner
Professional Engineer, Retired

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