Carbyne Automotive Mechanical Workshop Case Study

Vehicle: 2016 Toyota Prado
Odometer: 142,458 km

Task – Customer's request was to inspect the engine for an oil pressure warning and power loss.

The customer noted an oil pressure light and a rough-running engine with no power. Our diagnostic process included:

• Inspected oil system
• Blowby test – Failed
• Compression test – Failed
• Inspected pistons – Piston failure found
• Injector test – Pass
• Oil pump – Visual inspection Pass

Detailed Diagnostic Procedure:

• No oil detected on dipstick during prestart check
• No external oil leaks found
• Drained oil: only 5L present (should be 7.5L)
• Oil clean, no contaminants
• Oil topped up to correct level
• Oil residue found in intake hoses
• PCV hose check – excessive smoke and pressure

Summary:

We suspect the engine suffered blowby due to piston ring failure, which led to oil loss.
This lack of lubrication likely compromised the piston cooling jets, causing a piston crown cavity and eventual power loss.