Engine knock

Tiny
MFANAFUTHI DLAMINI
  • MEMBER
  • 2015 BMW 318I
  • 1.8L
  • 4 CYL
  • 2WD
  • MANUAL
  • 433,659 MILES
Vehicle started having an engine knock after timing without a timing tool. Could this be the cause? Is there any remedy?
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Saturday, May 28th, 2022 AT 11:57 AM

7 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

If it was running okay, you would have had the timing close enough and it wouldn't have caused damage. Is the noise loud enough for you to record and upload for me to hear? Also, is the engine oil clean and full?

Take a look through this link. You may find it helpful.

https://www.2carpros.com/articles/engine-noises

As far as the noise, there is always a remedy, but the expense needs to be studied first.

Let me know.

Joe

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Saturday, May 28th, 2022 AT 10:17 PM
Tiny
MFANAFUTHI DLAMINI
  • MEMBER
The engine was running fine. It just did not have power. The oil is full and clean, just changed two weeks ago.
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Saturday, May 28th, 2022 AT 11:35 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

It sounds like a low-end knock (crankshaft related). When you rev the engine, does it increase in speed? If you place it in gear, does it get more pronounced?

Is the mileage you indicated above accurate for this engine?

Let me know.

Joe
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Sunday, May 29th, 2022 AT 7:19 PM
Tiny
MFANAFUTHI DLAMINI
  • MEMBER
Thank you for your response.
Yes, the knock does increase. It doesn't get pronounced when the car is in gear. The engine mileage is 433691 km.
Excuse the late response. It's time zones.
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Sunday, May 29th, 2022 AT 10:07 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
No problem with the time zones. Chances are, you have a main bearing on the crankshaft which is worn beyond tolerance causing the sound. There are also thrust bearings in conjunction with the main bearings that can allow excessive play in the crankshaft. With the engine off, grab the crankshaft pulley and see if there is in and out play.

This type of problem is more common when you have a manual transmission due to added pressure on the flywheel.

As far as a repair, yes it can be done. However, because of the mileage, I feel you will likely have more time and money into rebuilding the engine than finding a good used one. Once the engine is apart, you will find a lot of other things needing attention just from normal wear (based on mileage).

If you want to replace it or overhaul it, let me know. I'll help you get through it either way.

Take care,

Joe
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Sunday, May 29th, 2022 AT 10:15 PM
Tiny
MFANAFUTHI DLAMINI
  • MEMBER
Thank you, I want to overhaul the engine. Question, do I have to buy a new oil pump or fit a used one? I have a spare oil pump that came from another engine that had a problem with valve stem seals. Please guide me on the parts I need to buy. I appreciate your assistance.

Kind regards.
Mfanafuthi
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Sunday, May 29th, 2022 AT 11:54 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

If you plan to rebuild the engine, I wouldn't recommend using a used pump. As far as what to purchase, that is nearly impossible for me to determine without the engine in front of me. When you do this, you need to take things apart, check to make sure they are not worn beyond specification, if the cylinder bores aren't beyond specification if the crankshaft journals are not worn too far, cam bearings, and the list goes on.

Normally, I have the overhaul procedures, but the 318 isn't offered in the US, so I don't.

If you could find a good, low mileage used engine, chances are it would be less expensive to repair the vehicle. When you overhaul one with this many miles, it can get expensive very quickly.

I hope this makes sense.

Let me know if you have other questions.

Joe
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Monday, May 30th, 2022 AT 6:34 PM

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