Why Cold Starting Is a Different Test
When the machine has already been running, the engine is warm and the oil has circulated. Even with insufficient compression or a fuel system on the edge, a warm engine may fire up quickly. Define the cold-start test conditions before starting the engine.
A cold start can provide clues about how the machine starts when cold. Where necessary, a professional should use instruments and equipment-specific documentation to check battery voltage under load, starter current, glow plug or intake-air heater operation, fuel supply and seal condition. A structured cold-start observation tied to the specific inventory ID can give you a condition snapshot that an edited seller's starting video cannot provide.
How to interpret a cold start
Cold-start performance is a useful indication of condition, but it is not complete proof of engine health. The result depends on ambient temperature, altitude, fuel quality, battery condition and whether starting aids are used. Difficulty starting at -10 °C may be normal for a particular engine model, while the same starting time at 15 °C may indicate a problem. Consider the manufacturer's information for the specific engine series together with the equipment's history and current configuration.
A machine that starts well may still lack power under load or consume excessive oil; a slow start may also be related to a low battery charge. Ask a qualified professional to investigate as needed, then decide whether to proceed, request diagnostic information or negotiate repair costs.
Pre-start walkaround inspection to set a baseline
Before touching the engine, record a time-stamped walk-around inspection video. The camera should show the engine block temperature or coolant temperature, the instrument panel, exhaust outlet, battery area and ground beneath the machine. If the coolant temperature gauge already shows the normal operating range, the machine is not cold and the test loses its value. Record the ambient temperature and any visible frost, snow or rain that affects the test.
Also record whether any starting aids are present and whether they have been used. Ether injection, a block heater, a battery charger or previous starting attempts can all change the starting conditions. A seller may claim the machine is cold; verify this using the temperature readings, records of starting-aid use and the on-site conditions together. If a heater was unplugged only minutes before filming, check the engine and coolant temperatures; unplugging the heater alone does not establish that the machine is cold.
The starting process: the heart of the test
The starting phase is where many edited videos lose their authenticity. Cutting directly from a close-up of the key to a running engine hides how many seconds the starter struggled. For a used drilling rig cold-start test, use continuous footage or multiple cameras to record the entire starting process, keeping changes at the instruments and exhaust visible. If the instruments provide the relevant readings, record the voltage drop and engine-speed response during cranking, and capture the moment the engine first fires.
Record the cranking duration in seconds and whether it is continuous or split into attempts. A long single crank or multiple attempts both warrant further checks considering cranking speed, battery condition and the fuel system; duration alone cannot establish the cause. Note whether the engine fires but fails to keep running, or shakes before stabilizing. These details are more informative than a simple pass/fail conclusion.
Observe smoke and exhaust behavior
Smoke at startup is easy to overinterpret. Record its color, density, duration and how it changes as the engine stabilizes, along with ambient temperature and any starting aids used. Similar-looking smoke can have different causes across engine series, fuel systems and operating conditions, so the video should preserve the observations rather than give a diagnosis.
If the seller says the smoke is normal, request the manufacturer’s emissions behavior data for that engine model and compare it with what you observed. Where necessary, have a qualified technician perform a compression test or injector leak test to investigate the cause.
Pressure, noise and gauge trends
After the engine starts, observe the oil pressure gauge and coolant temperature. Oil pressure should rise quickly; a prolonged delay may indicate worn bearings or a pump fault. Coolant temperature should rise steadily and should not spike. Note any warning lights that remain illuminated after startup, such as low oil pressure or a charging fault. These readings, recorded during the first few minutes, become part of the condition record.
Record abnormal noises and how they change as oil pressure and temperature stabilize. Investigate knocking heard on video using the engine-specific repair guide and further checks; before buying, have a qualified mechanic inspect persistent or unexplained noises.
Post-Warm-Up Leak and Restart Checks
The cold-start test does not end while the engine is idling. Once the machine reaches operating temperature, have a qualified person follow the equipment-specific manual and site safety requirements to inspect the ground below the engine and the areas around gaskets, hoses and the fuel system, with the engine shut down or under other safe conditions permitted by the manual. Temperature changes may make some leaks visible. Photograph or record any new fluid traces and compare them with the pre-start baseline.
If the specific engine procedure and site conditions permit, a hot restart can be added after the functional test. Record the shutdown interval rather than imposing a generic time, and film the second start continuously. An abnormal hot restart is a reason to carry out engine-specific diagnostics, not proof of a particular fuel-system fault.
How to request a cold-start test from GLOBMACH
When you send an inquiry through GLOBMACH, state clearly that you need a continuous cold-start test video designated by the buyer and linked to the exact stock item ID. State your expected environmental conditions, the acceptable test duration, and whether starting aids are permitted. Ask the seller to show the pre-start temperature and ground conditions before starting. This keeps the scope of the evidence clear and prevents a generic video from being substituted.
GLOBMACH can coordinate with the seller to film the video to your requirements. You can also request access to local inspection reports or arrange for an independent technician to witness the test. Use the records to decide whether to continue inspecting, request diagnostics or negotiate the price.
How to use these results in your buying decision
A smooth cold start is a positive sign. If the machine starts normally, proceed with a full inspection. Where a load test is needed, have qualified personnel perform it according to the equipment manual when equipment and site safety conditions permit. If it struggles to start, request a compression test or fuel-system check before making an offer. If serious problems appear, you can walk away or allow for repair costs in your offer.
Combine the result with repair and maintenance records, hour-meter readings and a structural inspection before deciding on your offer and the next checks.
