the edited & condensed version of this thread:


Tricks and Tips for reading indented part numbers.


# 1

Use some Bon Ami(white dishwashing powder scrubbing stuff) or another brand and sprinkle some onto the side of the part with the number that you need to read.

Scrub it some and rinse it out good, get the gunk off of it to get at the number. Then you can sprinkle some more of the white powder on there, then wipe across with a rag or your finger, use your discretion, then the Bon Ami fills in the indented space. The white powder against the rusted part or whatever the background is, shows up better and makes it easier to read.

# 2

Do a relief rub, like people do with old Tombstones.

Take some paper, something kinda of thin, and a crayon. Lay the paper against the part number and lightly scribble back and forth across the paper. The part number should show up with the crayon marking around it.

# 3

Using chalk to fill in the part number.

Rub chalk into the timing marks or part number and wipe off the excess so the degree marks/numbers will show up. They show up real well when using the timing light. This method works good for part numbers and maximum drum widths on old rusty brake drums, etc.


# 4

Using a digital camera and a digital image manipulation/editing program

You can take a picture of the part number with a digital camera. Stick it on your computer and then blow up the picture with software to the size you want.

Another trick for photographing ID numbers in hard-to-reach places is to use an off-camera flash on your camera (either with a cord, or a pricy remote trigger). That way you can light the number from the side, and that makes the number stand out due to the shadows.

# 5

Liquid paints or other coatings.

A Type – o fluid such as liquid paper or typex. It is the same as chalking it, but it lasts a bit longer. You can used white paint for the numbers


# 6

Sanding the part, will sometimes work well too. This creates a shiny surface with rusty numbers. The contrast helps you be able to better read the numbers.


# 7

You can spit on the part number, and wipe it with your finger(use discretion). This does not always work, especially on real rusty and dirty parts, but sometimes it works.


# 8

A strong acid will eat away the steel around the numbers faster than the numbers it self, where the steel is a bit more dense from the punch. Clean the entire part very well after trying this, as the acid will keep eating the metal away and you might loose that part.



# 9

Keeping the part numbers visible.

To keep them visible, like a frame number, that has to be checked for yearly inspection ( in some places) you can fill in the number with paint and cover it with some layers of “varnish” or a clear coat of some kind.


# 10

You can spray the numbers by holding a flashlight from an angle while simultaneously spraying the area with Gunk. The numbers will stand out. When you stop spraying, you likely will not be able to see the numbers anymore. This method was used with success on reading the block numbers on an engine.

Writers note: Gunk is a brand name of greasy parts and hands cleaning stuff, which comes in sprays, gels and creams; check your parts store.


# 11
You can rub welders soap stone across casting numbers, helps to see see the numbers.