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  #1  
Old 05-11-2002, 07:24 PM
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E320 is getting a new head gasket

starting today. If anyone wants any pictures let me know.

The hardest part so far was getting the hose off of the bottom of the intake manifold. Listed as "vent pipe" on the print out from the CD rom. I called it something different while working to get it off . Another couple hours and I will have the head off. Got the intake manifold off today.

If anyone can tell me what is the sensor on the drivers side lower block, behind the throttle body area - please?? I can take a pic of it if ya'll need to see it . Also, what in the world is that "box" looking thing that is built into the middle of the intake manifold.

Gasoline stinks compaired to the diesel .

thanks
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  #2  
Old 05-11-2002, 07:33 PM
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That is a very cool apparatus !!!
It lengthens/shortens the intake to tune the intake to the engine RPMs. [ via a vac. controlled air flapper in that box].
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  #3  
Old 05-11-2002, 07:43 PM
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that little thing?!? Wow, very impressive indeed. Is there any cleaning/maintenance required? I have not really paid any attention to how other manufacturers do it.

I look at this engine laying there like this and imagine what it would look like with three Webers being charged with 3-4 psi of boost from a turbocharger mounted on the other side - well I can dream can't I.

It takes more time to get all the hoses and connectors off than the head off. Where's that 240D.
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  #4  
Old 05-11-2002, 09:52 PM
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If it's not too much trouble, I'd love to see some photos.

I have the same car and could use the education.
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  #5  
Old 05-12-2002, 12:35 AM
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Post 104 headgaskit

The little sensor at the block is a KNOCK SENSOR..That retards the Timing..
The black box is a Secondary intake shorter/bypass for better bottom end and midrange

FWIW I never took off the Intake MANIFOLD when I did Headgaskits on the 104 motor AND SAVED LOTs of TIME (Just moved it over)
I could do a 104 headgaskit in under four hours..
I WAS Doing LOTS of them when The 300E E 320 were under Warranty They PAID GREAT! 9/10 hours
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  #6  
Old 05-12-2002, 10:23 AM
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Here is a pic of the knock sensor (to the center right of the photograph). What is the name of the part to the left in the same photo?
Mark - I am slow at this stuff (this is my first E320) and will probably take about a week or so to do the job - depends on juggling work and kids activities.
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  #7  
Old 05-12-2002, 11:51 AM
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Looks like the throttle actuator to me.

The knock sensor doesn't retard the timing. It gives a generated voltage signal looking much like a graphical expression of noise to the engine management system. Based upon the controllers program levels of noise are reguarded as knock and the cylinder at fault (the system can tell which cylinder through calculation and the fact that there are two sensors). The management system then reduces timing after an event by 3 degrees. If after the next firing a similar judgement is found, another 3 degrees are removed. This goes on up to 15 degrees per cylinder, individually. If after a firing it is judged that there was not a knock then a degree of timing is replaced. Thus 15 degrees are removed in a possible 5 firing events but takes 15 firings without knock to return. This is dynamic and ongoing.
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  #8  
Old 05-12-2002, 02:12 PM
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Now my question Jim. Is the a head gasket for a specific reason, or a "just because" repair?
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  #9  
Old 05-12-2002, 08:29 PM
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That's what I thought it was called Steve - thanks. Where is the other knock sensor?

Over the past few weeks I had started seeing a little oil in the coolant reservoir and the other cars are running pretty good for now so I figured I would go ahead and take care of the head gasket. The car was not running hot nor showing any symptoms of having problems other than the oil in the reservoir. In addition, I wanted to go ahead and do it before it gets too much hotter (ambient conditions ) - it gets hot out there in that garage in the middle of the summer around here.

Haven't had much time to work on it today with it being Mother's day and all but give me a couple more hours and let me get by Sears to get the socket I need to remove the exhaust cam sprocket and I should have it off. Everything has been pretty straight forward so far.

I'll bet those first techs that started replacing these W104 cylinder heads gaskets liked to went into shock way back then when they "disturbed/ruined" the wiring harnesses during this job (prior to the original harness being known as a problem area).
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  #10  
Old 05-12-2002, 08:39 PM
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and pls. get a picture of the headgasket with those stainless steel inserts - just curious how it looks...
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  #11  
Old 05-19-2002, 10:23 PM
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It's off after going through the ordeal with the upper chain guide rail pin. I ended up pulling the lower cover off too. I have attached a picture of the block and I suspect the leakage was either at the passengers side front or rear of the block. I don't know. Should the area where oil was getting through to the coolant be visible? By the time I got the head pulled the gasket was distorted in a couple places and you could not tell too much about it. I will post a picture of the new head gasket when it is in place. Looks like I have a couple days worth of clean up to do now before starting to put everything back together.
Can anyone tell me if this engine is sleeved?
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  #12  
Old 05-20-2002, 12:52 AM
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Hey,

Enjoying your thread here (and some of your previous adventures with your 240D!)... Whatever happened to that car anyway?

I'm looking at a 86 300E and it needs both. After reading some posts from people who've done the valve seals, it sounds a bit tricky and dangerous if you drop parts into the engine. Would it be easier to change the valve seals with the head off?

How much further is it to go to change the pistions? Just thought while I'd be in there.... Maybe that's too big a job, though.

Anyway, any more pics or details of getting the head off would be appreciated!

Thanks... Good luck!

-m
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  #13  
Old 05-20-2002, 07:49 AM
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The niece is driving the 240D this summer while I save my $$ for that $1700 paint job.

Replacing the head gasket on a 103 engine is probably a piece of cake compared to the 104 (just guessing from the way the engine looks in Adam B's pictures).

The car is not using any oil so I do not plan on doing any work on the head other than changing the gasket. The key thing to doing the valve stem seal replacement without removing the head is to make sure the piston on the cylinder you are doing is at TDC. You can look at the cam lobe position to determine this. Put the #1 piston at TDC compression and that is the postion the cam lobes need to be at in the other cylinders when you do the seals in them.
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  #14  
Old 05-24-2002, 10:16 PM
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Got everything buttoned up and all that is left is to finish putting the cam cover and spark plug wires on and then top off the fluids. I am planning on flushing the cooling system a couple times, run it for 500 miles, change the oil and it should be good to go. Hopefully it will be at 200k+ miles before I have to do it again.
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  #15  
Old 05-24-2002, 11:12 PM
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Thumbs up

Glad to hear No more Problems!

Are you Keeping the Pin ?


Good Luck
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