rust removal

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rust removal

Postby tatonka » Mon Jun 03, 2013 5:40 am

not really a BM question , but there are lot of smart people here so Ill ask. I have a 66 valient , the motor is a slant 6 and the water lines in the block are rusty. I had it flushed by a pro with a machine and he said it was bad. It runs hot unless the weather is cool then its ok , my question is , is there a ggod way to disslove the rust. Was thinking of vinegar , but dont know what it will do when heated.
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Re: rust removal

Postby FIGJAM » Mon Jun 03, 2013 6:50 am

Vinegar was my first thought when I read rust.

I think I would pull the thermastat, reconnect the housing, drain as much water out as possible, and fill it with vinegar.

Start it up and let it run for 3 minutes, then shut it off and leave it overnight.

Next day, drain and flush with water, install a new thermastat, and see if there is any improvement.

I soaked some chains that were rusted solid and it made them useable again.
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Re: rust removal

Postby ygmir » Mon Jun 03, 2013 6:55 am

in my MBZ diesel club, they swear by citric acid. cheap and supposedly really works good, while not harming other stuff.
you might google citric acid flush for exact details.
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Re: rust removal

Postby EspressoDude » Mon Jun 03, 2013 7:15 am

Be careful about these treatments eating the radiator. Ever see how lemon juice(citric acid) removes the color from a copper bar top? Might eat the radiator also. But then maybe the radiator is the problem...can't get rid of heat.
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Re: rust removal

Postby FIGJAM » Mon Jun 03, 2013 7:35 am

Yup.

If the rad is the weak link, this treatment will expose it.

Just means you needed a rad anyway. 8)
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Re: rust removal

Postby FIGJAM » Mon Jun 03, 2013 7:48 am

If the rust is that bad the fins on the waterpump may have disolved.
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Re: rust removal

Postby trilobyte » Mon Jun 03, 2013 9:42 am

I'm giving this a nudge over to Open Discussion, since that's a better fit for stuff that isn't really about Burning Man.
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Re: rust removal

Postby MikeGyver » Mon Jun 03, 2013 12:49 pm

Vinegar flush is what we did on my 78 Dodge pickup (same straight 6 engine) one of my first tests is drain the fluids and stick a hose in the top of the block then the radiator seeing how the flow is.(With the thermostat out)

On a Side note, I've got a 65 Valiant Convertible, the previous owners weren't good repairers... came with a tiny radiator out of a ford, once we bought an up rated radiator it cooled much better.
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Re: rust removal

Postby gyre » Mon Jun 03, 2013 1:50 pm

There are a lot of ways, but be careful that you can get it out safely.
At worst, there is a way to clean out all these lines, and is a standard recommendation rebuilding an engine.
This is the cause of a lot of mystery engine problems.

Kanolabs probably has the right chemical.
I use their silikroil for really difficult frozen hardware.

Coke has been recommended for this purpose.
Auto trans fluid is a last resort.
May penetrate gaskets quite well too.
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Re: rust removal

Postby tatonka » Mon Jun 03, 2013 6:17 pm

thks all for the tips :)
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Re: rust removal

Postby gyre » Mon Jun 03, 2013 9:40 pm

The risk with clogged galleys is hot spots that you're unaware of, until fatal.
This is why few shops will guarantee work on an unrodded block.
Some won't even touch one.

It's a lot of trouble with a running engine in the car, so you'll have to make the call.
If you're runninbg stock, less risky, of course.
That engine is extremely tough though, so worth getting right, even adding fuel injection to.
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Re: rust removal

Postby tatonka » Tue Jun 04, 2013 5:12 am

I have a 75 ply slant 6 and trans that runs great , the motor is just sitting in my driveway . Was going to just put that one in if I couldnt get the other to stop overheating.
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Re: rust removal

Postby tatonka » Tue Jun 04, 2013 4:47 pm

had 2 qts of vinegar that I bought to take to the playa, drain radiator and put those in and let it run the 3 min then left it overnight and drained it in the morning and went to work. It was cool out about 58 and the car ran 50% better temp wise , on way home at about 82Deg it ran about a 1/5 cooler than normal. So will try with more this week and hope it progresses. :) thks
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Re: rust removal

Postby unjonharley » Tue Jun 04, 2013 4:52 pm

tatonka wrote:had 2 qts of vinegar that I bought to take to the playa, drain radiator and put those in and let it run the 3 min then left it overnight and drained it in the morning and went to work. It was cool out about 58 and the car ran 50% better temp wise , on way home at about 82Deg it ran about a 1/5 cooler than normal. So will try with more this week and hope it progresses. :) thks


Did you drain it at the petcock? If so, drain again by dropping the lower hose. the petcock is a very small hole..
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Re: rust removal

Postby tatonka » Wed Jun 05, 2013 8:21 pm

just drained the rad. will take a hose to it this weekend , see many small pieces of rust in the water now , will do another treatment with more vinegar than I used last time . Then alot of flushing , thks again all :)
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Re: rust removal

Postby gyre » Wed Jun 05, 2013 8:28 pm

Good luck.
If you swap engines, check to see if the trans type is as good, or has different ratios.
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Re: rust removal

Postby tatonka » Wed Jun 05, 2013 8:31 pm

gyre wrote:Good luck.
If you swap engines, check to see if the trans type is as good, or has different ratios.


I pulled it out of the 75 which was a good runner until the rear end went , it was very ugly tho .
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Re: rust removal

Postby unjonharley » Wed Jun 05, 2013 8:34 pm

Check out your freeze plugs.. They are the weakest point.. To install new plugs. Use a doll of the inside diameter. Tap in with a soft hammer..
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Re: rust removal

Postby unjonharley » Wed Jun 05, 2013 8:43 pm

Had a slant 5 in my van "Arnold". He gave a lot of good rides..In his past life. He was phone repair.. Then a family toured the US with him.. The mom flagged me down and gave me the spare part that should have gone with Arnold to new home with me. That was 25 tears ago..
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Re: rust removal

Postby gyre » Wed Jun 05, 2013 10:53 pm

The push button trans are highly regarded.
Check the 75 model you have before using it.
Might be better to keep the old one.
Ratios may vary too.

I'm sure the 75 would work if you need it though.
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Re: rust removal

Postby gyre » Wed Jun 05, 2013 10:54 pm

I like the sound of that van.
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Re: rust removal

Postby tatonka » Fri Jun 07, 2013 2:55 pm

at work today the water pump gave out , replaced it and on the ride home it ran abit cooler still :) Will still flush it again tommorrow.
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Re: rust removal

Postby gyre » Fri Jun 07, 2013 3:10 pm

Won't cure a blocked line, but evans non-water fluid is a standard for some cars.
Stops oxidation.

There are higher efficiency water pumps, which all older engines could use.
I use a griffin radiator on my hot running car.
A high pressure water pump might be a bandaid.
I use one for higher pressure at the cylinder head.

Good luck with it.
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