Dropped pin into timing chain cover and probably sump - options? - Mercedes-Benz Forum
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post #1 of 57 (permalink) Old 08-01-2019, 06:23 PM Thread Starter
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Dropped pin into timing chain cover and probably sump - options?

While I was replacing the water pump I decided to replace the timing chain guides, sprockets and chain since I had most of the stuff out of the way. I was putting in the last driver side upper guide pin with a hammer and small metal 1.5" dowel when the dowel jumped and fell into the distributor opening. I could hear the clink clink sound as it fell down behind the timing chain cover and most likely into the sump. idiot me had a rag in that opening for the last 3 days and decided to pull it to do some cleaning up. The manual was not clear to me as to the oil plumbing/flow but I think there is a pick up screen in the sump and I should be ok. My first thought is just leave it there as it will not get through the screen. Is there any reason to worry if the dowel is rolling around the sump or should I prioritize getting that thing outta there before I fire up the car?
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post #2 of 57 (permalink) Old 08-01-2019, 06:46 PM
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Is your oil pan full? You might be able to flush it out by just draining the oil.
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post #3 of 57 (permalink) Old 08-01-2019, 06:54 PM Thread Starter
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Yep, the oil pan is full. Not sure what my chances are of it getting rolling down to the drain hole if I change the oil. It is currently on ramps so maybe that would increases the odds........ Maybe I should just wait until it's ready for an oil change in ~2000 miles and take my chances. If there is a strainer/screen I should be ok.........yes?
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post #4 of 57 (permalink) Old 08-01-2019, 06:56 PM
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Yep, the oil pan is full. Not sure what my chances are of it getting rolling down to the drain hole if I change the oil. It is currently on ramps so maybe that would increases the odds........ Maybe I should just wait until it's ready for an oil change in ~2000 miles and take my chances. If there is a strainer/screen I should be ok.........yes?
I believe there is, but I wouldn't take the chance to save money on something like that.
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post #5 of 57 (permalink) Old 08-01-2019, 07:04 PM
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Attach magnet to oil pan bottom to trap it or drain oil and fish with magnet through drain hole.
How large is the pin?


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post #6 of 57 (permalink) Old 08-01-2019, 07:10 PM Thread Starter
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Ok......I'll drain the oil and if it doesn't come out I will put a borescope in the drain hole with a small hook or magnet to see if I can hopefully find it and retrieve. It is 1.5" long and slightly smaller than the diameter of the timing chain guide rail pin threads.
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post #7 of 57 (permalink) Old 08-01-2019, 10:28 PM
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Probably a stupid question but have you tried fishing around in the hole with a thin extendable magnetic pick up?
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post #8 of 57 (permalink) Old 08-02-2019, 05:48 AM
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Originally Posted by Aussiemerc View Post
Probably a stupid question but have you tried fishing around in the hole with a thin extendable magnetic pick up?
Did you mean down the hole that it fell through? Might be worthwhile, but lot's of steel parts that the magnet could stick to. A thin borescope might be worth trying down the distributor hole, but is there a straight passage down past the gears? Through drain hole might work if pickup can be bent so it can 'scan' the bottom of the sump.

If the pin is in the lower pan, and the pan is aluminum, it might be possible to use a strong magnet against the pan and drag the pin close to the drain hole (after first draining). Bit hit or miss, so knowing where pin is with borescope would help.

Good luck with it.

Last edited by MBGraham; 08-02-2019 at 05:58 AM.
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post #9 of 57 (permalink) Old 08-02-2019, 06:44 AM
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You want to be sure it is in the pan. It wont cause a problem there, but if is stuck in the timing gear area, that could be awful.

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post #10 of 57 (permalink) Old 08-02-2019, 06:46 AM Thread Starter
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I'll try my borescope from the top first through the distributor passage. Hopefully it fits. Not sure if the end of my borescope will fit in the oil drain hole. The pin is stainless steel so it's hit or miss on if a magnet would work. If you look at the pic there's really nothing in the way between the distributor gear hole and the sump unless it hung up on the timing chain cover which is doubtful. So I probably won't see it if it's sitting in 10 qts of oil. Is there a screen on the oil pick up port in the sump?
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