Low compression

KIMMY2452

MEMBER
2009 MERCEDES BENZ C350
V6
75,000 MILES

What repairs would be needed if there is low compression in cylinder two?

Thursday, May 17th, 2018 AT 8:17 PM

5 Replies

JIS001

MECHANIC
3,411 POSTS

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

KIMMY2452

MEMBER
3 POSTS

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

JIS001

MECHANIC
3,411 POSTS

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

KIMMY2452

MEMBER
3 POSTS

Does the price seem accurate for the cylinder head?

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Friday, May 18th, 2018 AT 10:31 AM

JIS001

MECHANIC
3,411 POSTS

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?