Some people have asked if the bolt would become brittle. I wouldn't have a problem fitting these to a lawnmower engine as the torque is only about 25ft lbs. I know that quenching bolts can make them harder and also brittle but in low torque situations, they will be fine in my opinion. I may do a test on these bolts by reheating one of the blackened bolts and let it cool naturally and see if it retains the rust prevention properties and also do a stress test on the bolts in question to failure to see the result.
I've heard of painting waste oil onto metal parts (like hinges) and then baking/burning it on with a propane torch to make a good (& cheap) finnish. This is the same thing the other way round, and you have shown how well it works. It's also a classic example of blue collar ingenuity. Thanks for the demo.
It defiantly makes them more "brittle" (hardened), you should temper them,. Bake them in an oven at 400 for a couple of hours and let cool slowly. Great video thanks for sharing.
I have done a similar thing but I use a camping stove and a tin can I fill the can with enough oil to cover the bolts then heat it up until the oil starts bubbling and releasing gas (catches fire sometimes oops ) then I let it cool for an hour or so repeat the process once more and let them cool in the oil overnight I find this works quite well going to do a couple of small trim bolts on my car to test the durability/rust protection
Hmmm. Probably made it brittle. Maybe you could take one of the bolts as an experiment and heat it back up and let it cool in the air. Then see if it has regained ductility and kept its rustproofing. Drive both bolts to failure and see which is stronger then set them back in the elements to see if the reheating takes away the rustproofing. Just a thought that might be interesting.
Yes Rob, I was thinking of exactly that as some people have asked about being brittle. I wouldn't have a problem fitting these to a lawnmower engine as the torque is only about 25ft lbs. I know that quenching bolts can make them harder and also brittle but in low torque situations, they will be fine in my opinion.
You could prob prevent rust by heating bolt in general, not necessarily hot enough to point of EM emission, but hoter and then spraying with lubricant. By heating metal the alloys particles vibrate faster, expanding gaps between particles and allowing better penetrative. Depending on lubricant molecule size. I just replaced 1/2 inch rusted deck bolts in supports a month ago and the washer and bolt are already rusting. Obviously I can't oil them every few months without removing floor boards and they don't seem to make coated or exterior bolts that size
It may have stopped them from rusting ,but with heating & quenching the balts will have hardend & with not tempering the bolts after the are guaranteed to fail under stress
if the bolts was to have nuts run up them and tightened up do you think it would effect the oil treatment Martin I.e remove the coating thus creating rust again to the bolt thread
I'm impressed with the results Martin, nice follow up video. Enjoy your Easter break and best wishes to you and your family. Enjoyed your Scotland trip as well (Butlers Empire) .. All the best , Joe
I saw a comment in another video where they heated up the metal only hot enough so it would melt paraffin wax (coating in wax not oil but should have a similar effect) . So not hot enough to see any colour change in the metal.
I wouldn't have a problem fitting these to a lawnmower engine as the torque is only about 25ft lbs. I know that quenching bolts can make them harder and also brittle but in low torque situations, they will be fine in my opinion.
@@retrorestore I can't find the video for testing the strength ... so are they still in same strength condition or is now a chance that the will break? I have done this process and now I'm not sure about strength 🤷🏼♂️
I did this in my secondary school on the late 70's in metalworking class. I don't watch Delboy's Garage. He comes across as too patronising and covers up mistakes in my opinion.
@@retrorestore I only came a cross him when i was searching how to stop bolts rusting, I haven’t watched much of his stuff myself but I remembered him when I saw this video 🙂👍
Those bolts have been in partial shelter and I don't believe they've been outside for 3 months. Do you wanna put your money where your mouth is? I have a challenge for you.
Some people have asked if the bolt would become brittle. I wouldn't have a problem fitting these to a lawnmower engine as the torque is only about 25ft lbs. I know that quenching bolts can make them harder and also brittle but in low torque situations, they will be fine in my opinion.
I may do a test on these bolts by reheating one of the blackened bolts and let it cool naturally and see if it retains the rust prevention properties and also do a stress test on the bolts in question to failure to see the result.
It’d be awesome if you did the experiment video dude, love things like that.
Happy bank holiday to you all :)
Sounds interesting Martin also very useful knowledge to have 👍
You ever do the video??
I've heard of painting waste oil onto metal parts (like hinges) and then baking/burning it on with a propane torch to make a good (& cheap) finnish.
This is the same thing the other way round, and you have shown how well it works. It's also a classic example of blue collar ingenuity. Thanks for the demo.
This video has changed my life! I have been painting bolt heads black for customizing, but now I will do this. Thank you 👍
It defiantly makes them more "brittle" (hardened), you should temper them,. Bake them in an oven at 400 for a couple of hours and let cool slowly. Great video thanks for sharing.
I have done a similar thing but I use a camping stove and a tin can I fill the can with enough oil to cover the bolts then heat it up until the oil starts bubbling and releasing gas (catches fire sometimes oops ) then I let it cool for an hour or so repeat the process once more and let them cool in the oil overnight I find this works quite well going to do a couple of small trim bolts on my car to test the durability/rust protection
Thank you Martin wonderful job love watching your videos I am watching from South Africa
Masterclass Mr Butler brilliant
Great tip, they look brand new!
Great result. I'd fotgotten about the original video. Nice to see the follow up.
Definitely worth trying this 👍
Great result and they look good .
Hmmm. Probably made it brittle. Maybe you could take one of the bolts as an experiment and heat it back up and let it cool in the air. Then see if it has regained ductility and kept its rustproofing. Drive both bolts to failure and see which is stronger then set them back in the elements to see if the reheating takes away the rustproofing. Just a thought that might be interesting.
Yes Rob, I was thinking of exactly that as some people have asked about being brittle. I wouldn't have a problem fitting these to a lawnmower engine as the torque is only about 25ft lbs. I know that quenching bolts can make them harder and also brittle but in low torque situations, they will be fine in my opinion.
@@retrorestore cheers mate. Keep up the great vids.
I have heard of people doing it with hot oil Martin good Tip.👌👍
Nice results Martin yes we have some rubbish weather ere in UK 🇬🇧 👌
Tell me about it
Thanks for the info fella, I will be using this for sure
great video thank you for the explenation been wanting to do my enduro bolts
love your workshop tones of work stations im building a small thing at the moment 9x12 workshop
Nice one, good luck with it.
Fabulous Martin, great tip
You could prob prevent rust by heating bolt in general, not necessarily hot enough to point of EM emission, but hoter and then spraying with lubricant. By heating metal the alloys particles vibrate faster, expanding gaps between particles and allowing better penetrative. Depending on lubricant molecule size. I just replaced 1/2 inch rusted deck bolts in supports a month ago and the washer and bolt are already rusting. Obviously I can't oil them every few months without removing floor boards and they don't seem to make coated or exterior bolts that size
Spot on Martin thumbs up 👍👍👍👍
Thanks 👍
That’s great , so it’s not just for looks , I need to do the bolts on my MK3 mondeo 2.5 engine bay
Thank you for your good videos.
Amazing information again Martin 👍🏻
Great work and thanks for sharing this with us
Nice little update
Thanks 👍
Those have held up great 👍
Great review Martin
Amazing results mate
Thanks Ash👍
It may have stopped them from rusting ,but with heating & quenching the balts will have hardend & with not tempering the bolts after the are guaranteed to fail under stress
These type of bolts are only tightened to about 25 ft lbs. no stress there bud.
Yep..... I use the technique to blue some of the tools I restore 👍🏻🛠️
Great idea martin
Thanks Roy👍
You should use this tip on Lee's campervan wheels as they spend most of the time sunk in mud lol ;-)
Great tip Martin 👍
Thanks 👍
if the bolts was to have nuts run up them and tightened up do you think it would effect the oil treatment Martin I.e remove the coating thus creating rust again to the bolt thread
I don't think so as the coating is etched into the surface.
nice tip martin
I'm impressed with the results Martin, nice follow up video. Enjoy your Easter break and best wishes to you and your family. Enjoyed your Scotland trip as well (Butlers Empire) .. All the best , Joe
Thanks Joe.
Great job Martin! Those bolts look like new again!👍 Happy Easter to you and the family!
Same to you Dave
@@retrorestore Thank you very much Martin!👍
Please please could you post bolt temper test after heating.
Makes a cracking job, and cheap!
I saw a comment in another video where they heated up the metal only hot enough so it would melt paraffin wax (coating in wax not oil but should have a similar effect) . So not hot enough to see any colour change in the metal.
good vid martin thanks lee
I remember that one Martin, nice results, how about a year update.
thats all fine but you can make them very brittle
I wouldn't have a problem fitting these to a lawnmower engine as the torque is only about 25ft lbs. I know that quenching bolts can make them harder and also brittle but in low torque situations, they will be fine in my opinion.
If i dip heated old bolts into a bowl of used engine oil will it cause fire??
you are the rust god......
Just curious, what would happen if we put that in normal vegetable oil?
Martin 👍
Brilliant Martin. I wonder if different oils will look different after the process?
I used new oil and used oil and they looked the same Ken in the previous video.
@@retrorestore I heard Olive oil dipped 3 times gives a beautiful black finish. I’ll have to try it, but first need one of those tumblers!
is the black bolt from a 35 classic engine it holds the fuel tank on and the rusted one looks similar but is a head bolt from 35 classic ??
Yes Dan Classis head bolts.
Hi Martin when you say black oil i guess you mean used engine oil ??? or has it got be clean oil 🤔
Watch the first vid Dave to stop me repeating myself.
Hi Martin. How does the heat treatment affect the strength of the bolt, if at all. Great tip, thanks.
I'll be testing that in another video.
@@retrorestore I can't find the video for testing the strength ... so are they still in same strength condition or is now a chance that the will break? I have done this process and now I'm not sure about strength 🤷🏼♂️
When are you going to start working on the trotter van?
When I've restored these 2 bikes.
@@retrorestore ok
Hi Martin did you get this idea from Dellboys garage, as I saw him do the same a while back. They do come out nice.
I did this in my secondary school on the late 70's in metalworking class. I don't watch Delboy's Garage. He comes across as too patronising and covers up mistakes in my opinion.
@@retrorestore I only came a cross him when i was searching how to stop bolts rusting, I haven’t watched much of his stuff myself but I remembered him when I saw this video 🙂👍
Interesting follow up Martin, by the way, sent you n e-mail the other day, have you had a chance to read it mate?
Not yet Phil, i'll have a look
Those bolts have been in partial shelter and I don't believe they've been outside for 3 months. Do you wanna put your money where your mouth is? I have a challenge for you.
They have Matt, I left them outside on that shelf after the first vid and they have been wet with the morning dew ect. What's the challenge?
You can't use those bolts in high torque areas in an engine
No, I agree.
No matter what I do my bolts don’t go cherry red they just go blue 🙄
Give it a go at that. Sounds like you are not using Mapp gas.
@@retrorestore using propane mate , does map gas get hotter?
I think it does.