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FAQs

No. A diesel compresses far harder, so a petrol gauge reads off the end of its scale. A diesel gauge in turn lacks resolution at petrol pressures.

Because the adaptor screws into the plug or injector hole and those threads vary widely. An 8 piece petrol kit covers common threads; a 42 piece master kit covers a far wider spread.

A compression test says how much pressure a cylinder builds. A leakage test puts air in and listens for where it escapes, identifying valves, rings or head gasket as the source.

A petrol and diesel master engine compression test kit at 42 pieces, which carries the gauges and adaptors for both rather than needing two separate kits.

A 13 piece commercial vehicle diesel compression test kit, since the adaptors and pressures differ from car diesel engines rather than being a larger version of them.

Oil pressure and vacuum, with a 12 piece oil pressure test kit held alongside. Those readings help interpret a compression result rather than replacing it.

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Compression & Leakage Testers

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Petrol and diesel compression testers are not interchangeable and the difference is pressure. A diesel engine compresses far harder than a petrol one, so a petrol gauge reads off the end of its scale and a diesel gauge lacks resolution at petrol pressures. Reading the fuel type on the kit before anything else avoids a gauge that cannot give a usable figure.

Adaptor coverage is what makes a kit usable on the vehicles that actually arrive. The adaptor screws into the plug or injector hole, and those threads vary widely. An 8 piece petrol kit covers common threads; a 42 piece master kit covers petrol and diesel across a much wider spread. A compression figure is also only meaningful against the figures from the other cylinders on the same engine.

Compression and leakage answer different questions. A compression test says how much pressure a cylinder builds. A leakage test puts air in and listens for where it escapes, which tells you whether the loss is at the valves, the rings or the head gasket. A digital petrol kit at 8 pieces records the reading rather than needing it noted at the engine.

Commercial vehicles need their own kit again, at 13 pieces for diesel, because the adaptors and the pressures differ from car diesels. Oil pressure and vacuum test kits sit alongside for the readings taken at the same time. Send the engine to 07754288583 on WhatsApp. Cylinder leakage kits at 7 pieces carry the regulator and the adaptors to pressurise the cylinder.

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FAQs

No. A diesel compresses far harder, so a petrol gauge reads off the end of its scale. A diesel gauge in turn lacks resolution at petrol pressures.

Because the adaptor screws into the plug or injector hole and those threads vary widely. An 8 piece petrol kit covers common threads; a 42 piece master kit covers a far wider spread.

A compression test says how much pressure a cylinder builds. A leakage test puts air in and listens for where it escapes, identifying valves, rings or head gasket as the source.

A petrol and diesel master engine compression test kit at 42 pieces, which carries the gauges and adaptors for both rather than needing two separate kits.

A 13 piece commercial vehicle diesel compression test kit, since the adaptors and pressures differ from car diesel engines rather than being a larger version of them.

Oil pressure and vacuum, with a 12 piece oil pressure test kit held alongside. Those readings help interpret a compression result rather than replacing it.

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