Correct answer
Main journals.
Main journals. They rotate in the block’s main bearings; connecting-rod journals or crankpins are separate surfaces carrying the connecting-rod big ends. Crank webs connect crankshaft regions and counterweights help balance it. Do not confuse the crankshaft journal itself with the surrounding bearing shell.
Practice more C licence questions
A self-check with exam-style questions on Mechanics and maintenance. Free, no signup.
All options
Main journals.
The bearing shells, which are the crankshaft surface itself.
The crankpins, which sit in the block’s main bearings.
Editorial status: editorially approved. This status does not certify legal review. Report a correction
Share this question
Keep studying
Related questions
- A liquid-cooled lorry has an expansion tank marked MIN and MAX. When checked under manufacturer instructions, how should the level be?
- To compare and adjust lorry tyre pressure to the recommended cold value for its load, when should it be checked?
- In a worm-gear steering system, how does the steering wheel return to its rest position (straight-ahead line)?
- Other conditions being equal, how may tyre pressure below the recommendation for the load affect fuel consumption?
- A lorry has an operational electric retarder and descends a steep gradient with suitable grip. Under manufacturer instructions, how should it be combined with the service brake?
- A breakdown leaves a lorry immobilised on the carriageway or shoulder of an insufficiently lit through-road within a built-up area, between sunset and sunrise. Which lights must remain on?