1997 S320 Head Gasket Replacement - Mercedes-Benz Forum
 
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post #1 of 6 Old 03-29-2013, 04:54 PM Thread Starter
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1997 S320 Head Gasket Replacement

Thanks to all who responded to my post on oil in the cooling system. I resigned myself to have to replace the head gasket as there is an oil leak involving the u shaped seal on the timing chain cover.

I have the engine torn down using the below links as a guide and am ready to set the cam positions before removing the timing chain. I am very concerned as what I am reading is not what I am seeing on the car. I am under the impression from these instructions that when the engine is set at 30 degrees btdc the dowel holes on the intake and exhaust cams should be in position to take a 4mm dowel to lock the cam so the timing chain can be removed. What I see is that the intake cam dowel hole is where the documentation states it should be but the exhaust cam is not lined up according to the documentation. Can someone help me with the proper procedure to set the cams.

Thanks for all your help.

http://www.continentalimports.com/ser_ic100345.html
http://www.peachparts.com/shopforum/...ad-gasket.html
http://www.justanswer.com/mercedes/1...e-replace.html
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post #2 of 6 Old 03-29-2013, 09:09 PM
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Are you sure you have number 1 cylinder at tdc?

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post #3 of 6 Old 03-30-2013, 04:27 AM Thread Starter
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No, It is set at 30 degrees BTDC.

Is 0 TDC where it should be for the intake and exhaust cams to be doweled with a 4 mm rod?
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post #4 of 6 Old 03-30-2013, 05:16 AM
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Originally Posted by jfarmer64 View Post
No, It is set at 30 degrees BTDC.

Is 0 TDC where it should be for the intake and exhaust cams to be doweled with a 4 mm rod?
OK I see where you have gone wrong, you misunderstood one of your links, in that link it says at 30 deg BTDC with chain removed the engine can be rotated without the valves hitting the pistons, this has nothing to do with timing.

The timing on the 104 engine is done with the crankshaft pulley set at 0/T or TDC on number one cylinder;
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post #5 of 6 Old 03-30-2013, 05:30 AM
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And now one serious word of caution, if your engine has the timing chain tensioner that comes in two sections, ie an inner and an outer section, the inners need to be removed BEFORE fitting the outer tensioner case to the engine and then you can insert the inners and tighten them up.

Failure to do this may cause the exhaust camshaft to snap off, as there will be way too much tension on the chain, I have seen this too many times over the years and that was techs doing the job.

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post #6 of 6 Old 04-07-2013, 06:52 PM Thread Starter
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Thanks for the feedback and input. Well we did the deed this weekend.

Got a subscription to All data DIY... very detailed instructions and along with the links above, did this in about 15 hours. Also helped to have the right tools.

Thanks for the warning on the cam tensioner. when I saw how tight the timing chain was getting during reassembly, went back and rechecked how it was to go together.

Car runs great and upon inspection of the Head Gasket, it was indeed crunchy...

Again Many thanks
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