Question about 1995 Mercedes-Benz S-Class

1 Answer

Knockin in the engine

I have a mechanic that says to check out the knocking in my engine that he would have to take off the head of the engine. 5 hours to take of off and 5 hours to replace it. Thus, 10 hours of labor to just check out the noise. This seems excessive. What is usually the labor involved to remove the head. The mechanic has done a compression test and it pased. He is saying I might have to replace the engine. Could this be something minor? Treated by some different oil to lubricant valves and lifters to stop the knocking?

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Mercedes-Benz Master
  • 5,687 Answers

Hello, There is usually a book the garages use called a "Flat Rate Repair Manual". This book is suppose to detail the procedures for the repair and give the mechanic an idea of what to charge.
This means if you call around, you can get a time estimate(multiply by hourly rate) of the labor.

Yours is one of those cases where there is not a diagnostic device to predict the problem and you need an old school mechanic to listen to the engine. Someone who is experienced can tell you what the problem is before opening the motor.

If you have a "rod knock", you have to go through the oilpan and/or pull the motor and you can get away with working on just the one cylinder thats bad. But the good news is if the noise is a hydraulic lifter and you have an overhead camshaft engine some of the parts are more accessible. You would not need to pull the head.

You are in a tight spot. To check out more prices use the telephone. The repair places need to hear the car before they can say much. If it is a hydraulic lifter sometimes STP can help. The 10 hours does sound extreme unless that would go to pulling the motor. Tell the current shop you can not pay for bad guesses and have them explain what part they intend to replace.

Posted on Jul 03, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

I hear a knocking sound when ever I start my engine

check oil level if low add oil ---if oil milky in color like chocolate milk possible internal damage from --blown head gasket-damaged head --the knock from engine usually means that damage to a piston rod has occurred [rod knock] and knock usually doesnt throw an engine code and usually fatal to engine will need a mechanic to diagnose how bad or what extent the noise is with engine

Aug 09, 2016 | Cars & Trucks

1 Answer

Pulley knocking

check if your pulley vibration rubber is broken, Just to do a test first,is to mark the pulley with a vertical line either using a tippex or any paint,start the engine and switch immediately off, check the pullet to see if the line changed,like breaking the line. If so then you need a new pulley.

Sep 16, 2012 | 2008 Ford F-350 Super Duty

1 Answer

Knockin REAL loud has oil, checked vacuum its good,any help please

It could be a rod. The only other thing I know of on a chrysler engine that would make a knocking noise is the hydraulic chain tensioners on the camshaft.

Feb 02, 2011 | 2001 Chrysler Sebring

1 Answer

Waterleak nopressure in hose loud knocking at top of engin

That doesn't sound good. It appears you have 1 of 2 issues. The no coolant is a bad/blown head gasket or cracked engine block. When the head gasket is bad or block is cracked the coolant leaks into the cylinder blows out the exhaust (have you noticed the smell of coolant or white smoke in the exhaust) then runs by the pistons and into the oil pan (check your oil level it is probably way high) where it mixes with your oil and reduces its viscosity/lubrication. After prolonged driving with coolant/water in the motor your bearing will wear prematurly and cause parts to become looser then they are (hense the knocking sound). If you continue driving with the knock the motor will have a mechanical breakdown and more then likely throw a rod. THis is usually a motor swap at this point. Some mechanics will replace the bearings but either or you will nee extensive work to correct. The head gaskets need to be replaced/checked and the head for warpage/seepage and possibly a cracked block plus fixing the damage to the lower end. Its usually cheaper to purchase a new/used motor as this is somehting that will cost $1000's of dollars so please pick a reputable mechanic for this kind of work... If you have an extended warranty this is the time to use it..

Oct 01, 2009 | 2002 Kia Sedona

2 Answers

2002 lincoln ls camshaft sensor..

It sound's to me like you'r mechanic is changing electronic sensors & part's when you havea mecanical problem!
Try another mechanic & get a second opinion I would !
Hope this help's but honestly don't go on changing electronics!

Sep 21, 2009 | 2002 Lincoln LS

1 Answer

Knockin noise in engine

Could be a lifter getting sticky. What engine, amount of mileage, and how often does it get serviced, and type of oil used, can all play a part in that.

Apr 05, 2009 | 2004 Dodge Ram 1500

1 Answer

Engine knocking

big end or main bearing.

Dec 22, 2008 | 1988 Toyota Pickup

1 Answer

I have a 2004 Sonnata 6cyl. This morning I went to start it up and the engine made a loud knocking noise and the engine light came on. Could this be from low oil?

ok did the knocking noise speed up as you pressed the pedal? if so id check the oil first and see if that helps at all and if it continues to make the knockin sound you might have a thrown rod/piston. The oil can effect the the pistons being as it is the lubricant for the pistons to move up and down in the bores(cylinders) but the low oil would only cause the engine to start knocking if there hasnt been any oil added as needed for a long while. has you engine got hot or warmer than usual? the could also be a symptom of low oil.

Dec 01, 2008 | 2006 Hyundai Sonata

Not finding what you are looking for?
1995 Mercedes-Benz S-Class Logo

242 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercedes-Benz Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers


Level 3 Expert

81400 Answers

Joseph Prosser

Level 3 Expert

772 Answers

Are you a Mercedes-Benz Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides