Low compression

Tiny
KIMMY2452
  • MEMBER
  • 2009 MERCEDES BENZ C350
  • V6
  • 75,000 MILES
What repairs would be needed if there is low compression in cylinder two?
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Thursday, May 17th, 2018 AT 8:17 PM

5 Replies

Tiny
JIS001
  • EXPERT
Here is a repair guide on compression testing that should help you narrow what is causing the low compression:

https://www.2carpros.com/articles/how-to-test-engine-compression

Let us know what you find with the added tests. Also, a cylinder leak down test can help narrow down if an intake or exhaust valve is leaking or a bad head gasket or bad rings are present.
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Thursday, May 17th, 2018 AT 11:11 PM
Tiny
KIMMY2452
  • MEMBER
I had the compression test done, and was told that the replacement of the right cylinder head needs to be replaced. Do they mean that the right cylinder head gasket is needed? I was told that the part is $5,784.00, and with labor $8,000.00. However, when I look online, the part is only a couple of hundred dollars. I want to confirm that when they say replacement of the right cylinder head, they are referring to the right head gasket.
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Friday, May 18th, 2018 AT 5:35 AM
Tiny
JIS001
  • EXPERT
No, it seems like they are saying to replace the cylinder head itself.
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Friday, May 18th, 2018 AT 8:52 AM
Tiny
KIMMY2452
  • MEMBER
Does the price seem accurate for the cylinder head?
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Friday, May 18th, 2018 AT 10:31 AM
Tiny
JIS001
  • EXPERT
If it is at a dealerahip then it is close. You may want to look around to see if the head can be serviced. Talk to a machine shop also to see if those heads are serviceable. You may get lucky and may just need a valve job.

Did they tell you what was wrong with the head? Like a burnt or sticky valve?
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Friday, May 18th, 2018 AT 3:25 PM

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