Crankshaft Seal Replacement

Mobile front crankshaft seal replacement at your home or office, for oil leaks that threaten the timing belt.

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Service Info

Typical Duration 2 hours

We confirm the crankshaft seal rather than the sump, timing cover or rocker cover is leaking, remove the timing cover and belt as required, fit the new seal square and to depth, check the breather system and verify timing before starting.

Skip the garage, our master mechanics come to you

At your home or office
Fair & transparent pricing
6-month, 6000km warranty

The Most Trusted Mobile Crankshaft Seal Replacement

The front crankshaft seal keeps oil inside the engine where the crankshaft pulley passes through the timing cover. It is a simple rubber seal, and it hardens and leaks with age. What makes it more than an ordinary oil leak is its position: on a belt driven engine, oil from this seal lands directly on the timing belt, and oil destroys rubber belts. Michanic replaces front crankshaft seals at your home or office.

Why Choose Our Mobile Crankshaft Seal Replacement Services?

  1. Timing Belt Protected:
    Oil on a timing belt degrades it and can cause it to fail, which on an interference engine destroys valves and pistons.
  2. Done With the Belt:
    Access to the seal usually means removing the timing cover and belt, so replacing both together avoids doing the same job twice.
  3. Cause Considered:
    A blocked crankcase breather pressurises the engine and pushes oil past seals. Fitting a new seal without checking it repeats the leak.
  4. At Your Home or Office:
    Done where the car is parked, with no workshop booking.

Why We are the Best Choice for Mobile Crankshaft Seal Replacement

  • Leak Source Confirmed:
    Oil at the front of the engine can come from the seal, the sump gasket, the timing cover or the rocker cover. The actual source is identified first.
  • Sealing Surface Inspected:
    A groove worn into the crankshaft snout by the old seal will leak past a new one unless it is addressed.
  • Fitted to Depth:
    The seal is installed square and to the correct depth with the proper tool, rather than driven in and distorted.
  • Timing Verified:
    Where the belt has been removed, timing is confirmed by hand through full cycles before the engine is started.

A front crankshaft seal leak is a small oil loss with a disproportionate risk attached. On engines with a rubber timing belt, the oil lands on that belt, and oil softens and delaminates the rubber. A contaminated belt can strip its teeth or snap well before its replacement interval, and on an interference engine that means the pistons meet open valves. The leak itself is minor; what it can cause is not. That is why a weep from this seal is treated as a priority rather than monitored.

Frequently Asked Questions

  • Why is a crankshaft seal leak urgent on a belt driven engine?
    Because the oil lands on the timing belt. Oil degrades the rubber, and a contaminated belt can strip teeth or snap well before its interval, which on an interference engine bends valves and damages pistons.
  • Should the timing belt be replaced at the same time?
    Almost always. Reaching the seal means removing the belt, so replacing it then costs only the part. If the belt has already been contaminated with oil, replacement is not optional at all.
  • What is the difference between the front and rear crankshaft seals?
    The front seal is at the pulley end behind the timing cover. The rear main seal is at the flywheel end and requires the gearbox to be removed, which makes it a considerably larger job.
  • Why did my new crankshaft seal leak again?
    Usually a groove worn into the crankshaft snout by the old seal, a blocked crankcase breather pressurising the engine, or a seal that was driven in crooked or too deep during fitting.
  • Is this leak dangerous or just messy?
    On a chain driven engine it is mainly an oil loss and a mess. On a belt driven engine it threatens the timing belt, which makes it one of the more consequential small leaks an engine can have.