6mm Endoscope for Spark Plug Hole UK: Used-Car Cylinder Checks
Answer first: The right 6mm endoscope for spark plug hole uk purchase is the one that reaches the view you cannot get with a torch—then lets you show evidence without inventing lab claims.
Serious DIY owners often want a sanity check before handing over deposit money. A thin probe through a spark-plug well is not magic—but it beats buying blind.
What to verify before you order
- Probe diameter versus the opening you will enter.
- Whether you need side views (articulation) or only a centre-line shot.
- Which USB port the lead uses on the phone you already own.
- IP rating for wet work—and which parts are not waterproof.
Honest limits
An endoscope does not measure compression, find every micro-crack, or replace a proper sewer reel. Use it to reduce guessing, then escalate when the job exceeds a phone kit.
The WJD101 on this site is a phone inspection camera: a 6 mm probe, a 2 m semi-rigid cable, 1080P, and an IP67 probe. A thumbwheel on the handset steers the tip. It is £78.11. Check the opening before you buy.
Frequently asked questions
Will a phone endoscope replace a dealer inspection?
No. It is a low-cost visual check for obvious carbon, scoring or moisture. A compression test and a leak-down test still need their own gauges.
Do I need a special app?
Most wired USB-C kits stream through a simple viewer app. Confirm the USB lead fits the port on your phone before the viewing day.
What should I look for on a used engine?
Even deposits, unusual scoring, coolant traces or heavy wet sludge. Photograph anything unclear and walk away if access is blocked.
Is 1080P enough inside a cylinder?
Yes for home screening. Move slowly and brace the cable so the image stays sharp enough to read the walls.