Pulley and rubber damper
Visible wobble, cracking, separation, displaced rings and rubber debris are checked with safe access and the engine stopped where required.
Belt-drive pulley diagnosis
Crankshaft Pulley Diagnosis & Replacement in South London
A wobbling pulley, rubber debris, belt noise or repeated auxiliary-belt problems can point to a failed crankshaft pulley or vibration damper. SP88 checks the belt drive before recommending replacement.
South London & nearby SurreyWeekdays: 10:00, 12:00 or 14:00Weekends closed
A crankshaft pulley fault can affect the whole belt drive
Many modern pulleys contain a bonded rubber damper. Separation can create wobble, noise or misalignment, but tensioners, idlers and driven accessories can produce similar symptoms.
Belt tracking and condition
The belt is checked for edge wear, lost ribs, contamination and evidence that it has been running out of line.
Tensioner, idlers and accessories
Related bearings and accessible driven pulleys are considered before a new crank pulley is fitted into a defective belt drive.
Fastener and timing relationship
Removal methods, locking requirements and tightening procedures vary. On some engines pulley disturbance can affect critical timing references.
How the visit works
Share the symptoms
Report wobble, knocking, charging warnings, heavy steering or a belt that has come off.
Inspect the drive
SP88 checks the pulley, belt path and accessible related components before parts are ordered.
Plan controlled replacement
The correct pulley and fastener procedure are confirmed; workshop work is used when locking, access or timing risk requires it.
Stop if the pulley or belt is visibly failing
A separated pulley can throw the belt, damage surrounding parts and remove charging, steering assistance or coolant circulation on some engines. Do not run the engine to demonstrate a severe wobble.
Mobile where suitable, workshop when necessary
Inspection may be mobile, but replacement often needs safe lifting, high-torque tools, engine locking or restricted-access work. If the pulley is connected to a timing-critical procedure, workshop control is the safer route.
Questions customers ask
Is the crankshaft pulley the same as the tensioner?
No. The crank pulley drives the belt from the engine; the tensioner controls belt tension. Either can cause noise or tracking faults.
Can a failed pulley trigger a battery warning?
Yes, if belt drive to the alternator is lost or slipping. The charging system still needs testing.
Is this the same as timing-belt replacement?
No. It is an external drive component, although some engines require timing-aware locking or procedures during removal.
Should the belt be replaced at the same time?
A damaged or contaminated belt may need replacement, but it is inspected rather than automatically assumed.
Send the vehicle details before booking
Include the registration, make and model, postcode and symptoms. That helps SP88 check likely access, parts and whether the first visit should be mobile diagnosis or workshop work.