Guides / Process

Getting a Discontinued Part Remade From the Original

September 23, 2026

Parts stop being made long before the cars that need them stop running. When the original is discontinued, out of stock everywhere or only available as part of an assembly costing ten times what you need, having one machined is often the shortest route.

The job starts with you, not with the shop. What you measure and what you send decides whether the new part fits.

Start with what the part has to fit

A remade part does not have to be a copy. It has to do the same job in the same space. That distinction saves money on nearly every job.

Sort every feature on the part into three groups.

Must be exact. Bolt centers, bore diameters, the faces that clamp against something, the depth from a mounting face to a locating boss. Anything that touches another component or sets a position.

Must be close. Overall envelope, clearance to a moving part, wall thickness where load passes through.

Can change. Cosmetic contours, draft angles left over from the original casting, radii that exist because a mold needed them. Machining these faithfully costs real money and buys nothing. A machined part is allowed to look machined.

Photograph the part fitted in place before you remove it. Once it is on the bench, the question of which way round it sits and what runs past it becomes surprisingly hard to answer.

Measuring without a CMM

You do not need an inspection room. A caliper, a thread pitch gauge, a set of radius gauges and a flat reference surface cover most brackets, mounts, pulleys and housings.

Some practical points that save a remake.

• Measure a worn part in the places it has not worn. A pivot bore that has run for thirty years is oval. Measure it in two directions, take the smaller figure and say in your notes that it is worn.
• Take bore diameters with the caliper jaws deep in the bore, not at the mouth. Mouths get belled by removal tools.
• Record every thread with a pitch gauge, and say whether it is metric or imperial. A thread that is nearly right is a scrapped part.
• For a bolt circle, measure between the centers of two adjacent holes, count the holes, and let the shop calculate the diameter. On an even number of holes you can measure straight across the two opposite ones instead.
• Use a flat surface as your datum. A piece of glass, a granite tile or a table saw bed is flat enough. Heights measured from one consistent face are worth more than heights measured from whatever the part is resting on.

Write the numbers on a sketch, not on a list. A sketch with dimensions on it removes almost all of the ambiguity a list of numbers creates.

When 3D scanning is worth it

Scanning earns its cost on two kinds of part: freeform surfaces that cannot be described with a handful of dimensions, and castings with no flat face to measure from. An intake manifold, a knuckle, a housing with organic webbing. Structured light scanners in the hands of a service bureau land within about a tenth of a millimeter on parts this size, which is fine for shape and not fine for a bearing fit.

What a scan gives you is a surface mesh. What it does not give you is intent. It cannot tell the shop that one bore is a press fit and another is a clearance hole, and it will faithfully reproduce a dent. Scanning and hand measurement work together: the scan carries the shape, your measurements carry the features that matter.

Weigh it against the value of the part. A few hundred dollars of scanning on a part worth two thousand is sensible. The same spend on a bracket is not.

If the original is broken

Broken is normal. It is usually why the part is being remade.

• Two halves still hold the information. Fit them together, tape them, and measure across the joint. Overall length from a fracture is unreliable, but bolt centers and bore positions on either side are not.
• The mating component is your second reference. If the part bolted to a housing, the housing has the bolt pattern. Measure the thing that survived.
• Symmetry fills gaps. If a left hand part is destroyed and the right hand one is intact, mirror it. Say so in the RFQ, because the shop needs to know which one it is looking at.
• Do not guess a wall thickness that carried load. If the part failed there, the new one should be thicker or in a stronger material, and that is a design decision worth naming.

Deciding the material

The original alloy is often unknowable and often not worth reproducing. What matters is what the part does. A weight and a magnet tell you most of it: steel sticks to a magnet, aluminum does not and feels light, cast iron is heavy and dull gray at a fresh break.

Tell the shop what the part carries and where it lives. A bracket in an engine bay that holds a harness and a bracket that locates a suspension link are different jobs, and the second one is not an aluminum part unless someone has done the sums. 6061 or 7075 covers that choice for aluminum parts.

What to send with the RFQ

Six things, and the quote comes back fast and firm.

1. A photo set of the part on a clean background with a ruler or caliper in frame, one photo per face
2. A photo of the part in the car before removal, if you still can
3. A measured sketch with the critical dimensions marked, and a note on which ones are worn
4. Thread sizes and pitches
5. One sentence on what it bolts to and what load it takes
6. The quantity, including whether you want a spare

If you have a scan or a model, send it alongside the photos rather than instead of them. Shops read photos faster than meshes.

A part remade properly this way is usually better than the original, because the original was designed for a casting process and yours is being cut from solid. Take the chance to fix the thing that broke. Send the photos and measurements and we will match the job to shops that do this kind of work. For the wider picture, start at the buyer’s guide.

Frequently asked questions

Keep reading

• Bearing Bore Tolerance in Automotive Parts: Press Fits That Hold
• AN Port Machining: Thread Specs for Fluid Ports on Car Parts