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Best way to prevent bolts from rusting? #5379369 03/18/20 09:15 AM
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inquirer Offline OP
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Quick question:

In my Mitsubishi Lancer 1 of the 4 bolts (I need to have the other 3 checked) of the front crossmember had rusted to the point it broke in half. The head has no signs of corrosion. Only the part that was in the chassis has corroded.

I bought a new one (not OE but of exactly the same strength) and I'm thinking what can I use to prevent the new one from rusting.

Grease of course offers protection, but is it OK to be used with bolts? I'm asking because I'm not sure if any kind of lubricant would be indicated for safety reasons. Do threadlockers as Loctite offer any protection against corrosion>? Any other alternatives?

Thanks in advance!

Re: Best way to prevent bolts from rusting? [Re: inquirer] #5379384 03/18/20 09:34 AM
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Trav Offline
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There are many types of anti seize, nuclear grade nickel offers the best corrosion resistance with steel but its very expensive, a nickel or copper anti seize will do the job well enough. Blue loctite also acts as an anti seize compound as well as a thread locker but not quite as good as a dedicated anti seize product.


ASE L1, Master. Deutsch Meisterbrief.
Re: Best way to prevent bolts from rusting? [Re: inquirer] #5379385 03/18/20 09:36 AM
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Donald Offline
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Never-seize


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Best way to prevent bolts from rusting? [Re: Donald] #5379394 03/18/20 09:44 AM
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Originally Posted by Trav
There are many types of anti seize, nuclear grade nickel offers the best corrosion resistance with steel but its very expensive, a nickel or copper anti seize will do the job well enough. Blue loctite also acts as an anti seize compound as well as a thread locker but not quite as good as a dedicated anti seize product.


Anti-seizes have lubricating properties, right? Does this mean that even grease or silicon grease would be OK regarding safety?

Originally Posted by Donald
Never-seize

I'm afraid that brand is not available in Greece.

Re: Best way to prevent bolts from rusting? [Re: inquirer] #5379405 03/18/20 09:52 AM
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Trav Offline
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The greases do not contain the metallic particles. There are anti seize compounds that are non metallic that use other substances like graphite to prevent fastener seizure.
Yes anti seize has lubricating properties and torque should be reduced by roughly 20% when tightening, on large diameter fasteners is not really an issue.


ASE L1, Master. Deutsch Meisterbrief.
Re: Best way to prevent bolts from rusting? [Re: inquirer] #5379407 03/18/20 09:53 AM
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Bailes1992 Offline
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Can you get Krown T40 in Greece? Might be worth dipping a nut and bolt into a tub of Krown before installation and then giving them a light spray once a year or so.

Otherwise, grab some lithium multipurpose grease, like you'd use for CV joints and smother the nut and bolt before fitting. It's about all you can do.

Last edited by Bailes1992; 03/18/20 09:58 AM.

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Re: Best way to prevent bolts from rusting? [Re: Bailes1992] #5379414 03/18/20 10:03 AM
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Originally Posted by Trav
The greases do not contain the metallic particles. There are anti seize compounds that are non metallic that use other substances like graphite to prevent fastener seizure.
Yes anti seize has lubricating properties and torque should be reduced by roughly 20% when tightening, on large diameter fasteners is not really an issue.


So which type is best for steel bolts?

By the way what do you mean torque should be reduced by 20% when tightening? That an anti-seize would have as a result less friction after tightening the bolt or that less torque should be used as the target torque of tightening by the mechanic?

Originally Posted by Bailes1992
Can you get Krown T40 in Greece? Might be worth dipping a nut and bolt into a tub of Krown before installation and then giving them a light spray once a year or so.


I'm afraid that's not available either. I just saw that Loctite has anti-seizes too, so maybe that's a respectable solution. Anyway, I'm most concerned about finding the best type for the situation and I'll see what brands I can find that fulfill my requirements.

Re: Best way to prevent bolts from rusting? [Re: inquirer] #5379418 03/18/20 10:08 AM
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Kira Offline
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What year Lancer?

Sounds like you were lucky with getting the corroded threaded part out.
Does replacing the other 3 sound like a good idea?

You'll find that the quality of the bolts used has everything to do with the speed of rust propagation.
Look under several vehicles of approximately the same age and you'll see varying degrees of rusting due to varying degrees of material quality.

Re: Best way to prevent bolts from rusting? [Re: Kira] #5379437 03/18/20 10:24 AM
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Originally Posted by Kira
What year Lancer?

Sounds like you were lucky with getting the corroded threaded part out.
Does replacing the other 3 sound like a good idea?

You'll find that the quality of the bolts used has everything to do with the speed of rust propagation.
Look under several vehicles of approximately the same age and you'll see varying degrees of rusting due to varying degrees of material quality.



The car is between 9-10 years old and it was bought new from the dealership.

Half of the threaded part is still in... The mechanic will loosen the other bolts and try to remove the seized part. If they won't succeed, they will use the help of a guy from a machine shop.

I will of course check the other bolts. If there are signs of rust I will get them replaced too. I'm also thinking of checking bolts in the rear...

I was also wondering if the tubes of the chassis are sealed and if water gets in there. Supposedly the original bolts should be of superior quality. Imagine what would have happened if the car was regularly driven to areas were salting the roads is common...

Re: Best way to prevent bolts from rusting? [Re: Bailes1992] #5379438 03/18/20 10:26 AM
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Originally Posted by Bailes1992
Otherwise, grab some lithium multipurpose grease, like you'd use for CV joints and smother the nut and bolt before fitting. It's about all you can do.


Noted. There is no nut by the way. It's just a bolt that tightens inside the chassis and keeps the crossmember in place. the threaded part gets inside the chassis.

Re: Best way to prevent bolts from rusting? [Re: inquirer] #5379444 03/18/20 10:40 AM
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kschachn Online Content
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Originally Posted by inquirer
Quick question:

In my Mitsubishi Lancer 1 of the 4 bolts (I need to have the other 3 checked) of the front crossmember had rusted to the point it broke in half. The head has no signs of corrosion. Only the part that was in the chassis has corroded.

I bought a new one (not OE but of exactly the same strength) and I'm thinking what can I use to prevent the new one from rusting.

Grease of course offers protection, but is it OK to be used with bolts? I'm asking because I'm not sure if any kind of lubricant would be indicated for safety reasons. Do threadlockers as Loctite offer any protection against corrosion>? Any other alternatives?

The first time I removed the transmission from my ECHO two of the crossmember bolts had so rusted away that I was surprised neither one snapped during removal. When I installed new ones I coated the bolt threads and shaft with Cor-Ban 27L, an anti-corrosion compound. It seems to have worked well because when I removed the transmission again years later to replace the clutch the bolts looked very good.

Anti-seize is not specifically for preventing corrosion.


1994 BMW 530i, 252K
1996 Honda Accord, 288K
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Re: Best way to prevent bolts from rusting? [Re: kschachn] #5379451 03/18/20 10:52 AM
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Originally Posted by kschachn
Originally Posted by inquirer
Quick question:

In my Mitsubishi Lancer 1 of the 4 bolts (I need to have the other 3 checked) of the front crossmember had rusted to the point it broke in half. The head has no signs of corrosion. Only the part that was in the chassis has corroded.

I bought a new one (not OE but of exactly the same strength) and I'm thinking what can I use to prevent the new one from rusting.

Grease of course offers protection, but is it OK to be used with bolts? I'm asking because I'm not sure if any kind of lubricant would be indicated for safety reasons. Do threadlockers as Loctite offer any protection against corrosion>? Any other alternatives?

The first time I removed the transmission from my ECHO two of the crossmember bolts had so rusted away that I was surprised neither one snapped during removal. When I installed new ones I coated the bolt threads and shaft with Cor-Ban 27L, an anti-corrosion compound. It seems to have worked well because when I removed the transmission again years later to replace the clutch the bolts looked very good.

Anti-seize is not specifically for preventing corrosion.


Maybe it's not specific, but whatever substance can keep air away from the bolt can do the trick I guess. Also it should be a substance that can last without the need of reapplication and furthermore it shouldn't reduce friction considerably for safety reasons, because we probably don't want a bolt to get loose.

Those are my main goals. Specificity is not really a problem.

Re: Best way to prevent bolts from rusting? [Re: inquirer] #5379461 03/18/20 11:03 AM
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WyrTwister Offline
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Stainless steel fasteners . And either heavy grease or , maybe , even , wax ( thinking of Johnson Paste Wax ) .

When removing rusty fasteners , heat to dull red hot & then spray with your favorite penetrating oil . Repeat as needed . Try turning the fastener back and forth , a little at a time .

Best of luck to you .


Wyr
God bless
Re: Best way to prevent bolts from rusting? [Re: inquirer] #5379462 03/18/20 11:03 AM
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Oh okay. For me, specifically preventing corrosion was my goal since the idea of one of the bolts snapping off in a blind hole was pretty much a nightmare scenario.

And it's not just air you're keeping away it is moisture too. You want something that resists washout very well and the coating I mentioned is specifically for that application. That's not the primary goal of an anti-seize compound.


1994 BMW 530i, 252K
1996 Honda Accord, 288K
1999 Toyota Sienna, 434K
2000 Toyota ECHO, 284K
Re: Best way to prevent bolts from rusting? [Re: inquirer] #5379470 03/18/20 11:14 AM
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Originally Posted by inquirer
Originally Posted by Trav
The greases do not contain the metallic particles. There are anti seize compounds that are non metallic that use other substances like graphite to prevent fastener seizure.
Yes anti seize has lubricating properties and torque should be reduced by roughly 20% when tightening, on large diameter fasteners is not really an issue.


So which type is best for steel bolts?

By the way what do you mean torque should be reduced by 20% when tightening? That an anti-seize would have as a result less friction after tightening the bolt or that less torque should be used as the target torque of tightening by the mechanic?

Originally Posted by Bailes1992
Can you get Krown T40 in Greece? Might be worth dipping a nut and bolt into a tub of Krown before installation and then giving them a light spray once a year or so.


I'm afraid that's not available either. I just saw that Loctite has anti-seizes too, so maybe that's a respectable solution. Anyway, I'm most concerned about finding the best type for the situation and I'll see what brands I can find that fulfill my requirements.


Use a nickel anti seize and torque 20% less eg 100nm is spec tighten to 80nm.


ASE L1, Master. Deutsch Meisterbrief.
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