Setting Base Timing on a Gen2 motor - Page 3 - Mercedes-Benz Forum
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post #21 of 31 (permalink) Old 01-28-2019, 10:23 PM
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I just went out and checked the balancer. I now see it has come to rest with a nipple raised up on the edge of the balancer in front of the pointer. Is that the TDC marking? If so I do believe I had it at the wrong setting and the 0 I used wasn't TDC 0. I should have done better research and double checked ALL markings on the balancer. I only made sure to put it back on in the right place not to become familiar with it as I should have. I can use a socket and rotate the crank bolt to where it needs to be if I know what I am looking for.
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post #22 of 31 (permalink) Old 01-28-2019, 10:28 PM
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Please see attached is that the TDC nipple?
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post #23 of 31 (permalink) Old 01-29-2019, 12:04 AM Thread Starter
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That nipple is not TDC IIRC.
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post #24 of 31 (permalink) Old 01-29-2019, 04:15 AM
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The nipple is only for the pickup bolted to the little bracket on the front cover. That applies only to the diagnostic plug.
You need to line up the pin from the water pump and the -0- marking in the harmonic balancer.
The HB only goes on one way, the bolt pattern is specific, you can’t mess that up.
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post #25 of 31 (permalink) Old 01-29-2019, 04:45 AM
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Actually is not that hard to install the HB the wrong way, it happened before in this forum, the offset of that one screw is not much and apparently it can be forced into the wrong hole.

The attached should help (besides the PM I sent you last night). The pictures are from the 116 engine but the 117 has the exact setup (except the HB is a different color). Remember to check that in that position you also have the piston of #1 at TDC with both valves closed.

In conclusion: piston #1 at TDC with both valves closed, the "0" matching the pin and the distributor's rotor at the mark on the housing.
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post #26 of 31 (permalink) Old 01-29-2019, 05:29 AM
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get that crank on the big 0, and note where the rotor is pointing. I had this happen, most likely your dizzy is 180 degrees off. So at ZERO if it isn't pointing at 1 cyl, pull it out and replace it slightly forward of #1 since when it is seated, the rotor will turn CW to point at #1 directly. Don't get frustrated when putting the cap back on. I made a $125 mistake and put cap on crooked in my haste, broke it while screwing it in. Breathe during the process, it will work just fine.


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post #27 of 31 (permalink) Old 01-29-2019, 06:35 AM
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He took the HB off to do work on the WP. Your advice is correct if the HB was put back in the correct position. To confirm that the #1 piston has to be at TDC, or it will not work. In fact the above mentioned FRM procedure makes a reference to #1 piston too on the last page, last paragraph.
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post #28 of 31 (permalink) Old 01-29-2019, 07:18 AM
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Originally Posted by liviu165 View Post
Actually is not that hard to install the HB the wrong way, it happened before in this forum, the offset of that one screw is not much and apparently it can be forced into the wrong hole.

The attached should help (besides the PM I sent you last night). The pictures are from the 116 engine but the 117 has the exact setup (except the HB is a different color). Remember to check that in that position you also have the piston of #1 at TDC with both valves closed.

In conclusion: piston #1 at TDC with both valves closed, the "0" matching the pin and the distributor's rotor at the mark on the housing.
You said it: ....”can be forced into the wrong hole”.

If you have to force it, it’s clealy not lined up correctly. All the bolts should be able to hand thread into the crank.
Therefore there’s only ONE way the HB is designed to fit. Of course one CAN mount it incorrectly it you do have to try pretty hard.
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post #29 of 31 (permalink) Old 01-29-2019, 07:25 AM
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If you’re totally uncertain, and don’t want to remove the valve cover to check for closed valves, like liviu suggested (good suggestion), you can still turn the engine to #1 cylinder TDC. That’s right bank front cylinder.
Then line up the HB to -0- on the pin. You should be able to thread the bolts into the crank. If you can’t, turn the engine over 180*, and repeat the above.
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post #30 of 31 (permalink) Old 01-29-2019, 08:41 AM
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In the past someone on this forum did install the HB the wrong way and surprisingly was able to install all 6 bolts, so is not that hard.
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