2008 Impreza Connecting Rod Sound

[flameff77]

Hi everyone,

I am looking for some advice/feedback regarding a sound I am getting (very likely) from the Connecting Rod. Its almost a "clicking/knocking". The sound is heard when the revs are about 2500-4000 under light throttle. Its been happening for about 2-3 weeks now.

 

• 2008 Impreza 2.5 - Standard - 135,000KM (apx 84,000 miles)
• Oil has been maintained (5W-30 as the manual instructs)
• Did an oil change last week
• I did not over rev on a down shift

Here is a video where the sound can be heard while the car is being reved.

https://drive.google.com/file/d/1Z5N80iv4eaxlVKfdMqEarsLxMNlZSbod/view

 

From my research, this problem doesn't seem to be too common, but it does happen enough for there to be some attention. Here are some questions I have:

• Did you drive the car without fixing it? If so, apx how many KM did you use it?
• What would be the best approach to resolve this issue?
  • Engine rebuild
  • Engine swap
  • Connecting rod replacement
  • Sell it asap 
• Any vendors I can consider looking at for parts if I choose that route? I am in Canada if that makes any difference. 

Thanks in advance!

Edited November 24, 2019 by flameff77

[GeneralDisorder]

Cut the oil filter and check for metal. Could be a timing belt tensioner - hard to tell from the video. 

If it's a rod, you will see metal in the filter. DO NOT drive it. You will wreck the cylinder heads and they are EXPENSIVE. 

Best deal going is the Subaru reman short blocks for about $2350. 

Cylinder heads will need complete disassembly and cleaning - especially the intake rocker assembly - of all contaminated metal.

In the US this is usually about a $5,000 to $6,000 repair.

GD

Edited November 17, 2019 by GeneralDisorder

[flameff77]

On 11/17/2019 at 3:52 PM, GeneralDisorder said:

Cut the oil filter and check for metal. Could be a timing belt tensioner - hard to tell from the video. 

If it's a rod, you will see metal in the filter. DO NOT drive it. You will wreck the cylinder heads and they are EXPENSIVE. 

Best deal going is the Subaru reman short blocks for about $2350. 

Cylinder heads will need complete disassembly and cleaning - especially the intake rocker assembly - of all contaminated metal.

In the US this is usually about a $5,000 to $6,000 repair.

GD

Thank you for this reply. I didnt see any metal with the naked eye within the filter, any other symptoms that I can look at?

 

Anyone else have any comments? Thank you!