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FAQ: Bmw 745i valve stem seal replacement?

Can you replace valve stem seals without removing head?

The worn seals cause oil to leak between the valve stem and guide, causing blue-gray smoke to come out of the tail pipe every time you start the engine. On most vehicles, it’s possible to replace these valve seals without removing the head.

Why do BMW valve stem seals fail?

My personal theory is that BMW extended(15k) oil change intervals is the cause for these failures. Sure the oil is capable of running that long but the problem is the injectors. Leaking or slightly leaking injectors will degrade these oil fast. With that, fuel will ruin rubber seals.

How much does it cost to replace valve stem seals?

Valve Seals Replacement Cost



The cost of this replacement job will be between $900 and $1,800, depending on the make and model of your vehicle. The process of replacing valve seals involves disassembling the entire engine until you can reach the valve spring.

When should you replace valve stem seals?

Here are some symptoms of a bad valve seal that may need to be replaced:

  • Performing the Cold Engine Test. One sure-fire way to tell if you have a faulty valve seal is to perform a cold engine test.
  • Idling.
  • High Levels of Oil Consumption.
  • High Levels of Smoke.
  • Engine Braking Test.
  • Acceleration Power is Compromised.
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How do I know if my valve stem seals are leaking?

Valve Stem Seal Failure Symptoms

  1. With A Cold Engine. One of the most noticeable signs of worn valve stem seals will be just after a cold engine start.
  2. Idle and Stop and Go Driving.
  3. Off-Throttle Braking.
  4. Oil Consumption.
  5. Excessive Smoke.

How much should a valve job cost?

RE: How much should a good valve job cost? the machine work should be about 150-250 for a valve job and resurface, plus another 10-15 bucks per exhaust seat thats installed.

How much does it cost to replace an oil seal?

This seal ensures that engine oil does not leak out. If it starts to crack or otherwise malfunction, you will be left with an oil leak. You will pay between $650 and $850 for this replacement. The labor should cost around $700, while parts are only about $35.

What do I do if my valve stem is leaking?

If the valve stem is leaking, you can easily fix it yourself with a valve stem tool. You only need a valve core tool and a package of new valve cores (both inexpensive).

How do I know if I have bad valve seals and piston rings?

It simple to test. If you accelerate and blue smoke continues until RPM is high all the time these are rings. If you see smoke just few seconds after acceleration these are valve seals. The more idling time the more blue cloud with acceleration also indicates the valve seals are bad.

Why do tire valve stems leak?

If you have older valve stems, they may go bad over time, due to use, dislocation, and exposure to chemicals on the road, such as road salt. If your valve stem is damaged, there will be a slow and constant leak. This leak could come from either the body of the valve, or the base of the valve, where it meets the tire.

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