Help with timing part for a 1972 Mercedes-Benz 250/8 130.923 - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 08-20-2014, 01:25 PM Thread Starter
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Help with timing part for a 1972 Mercedes-Benz 250/8 130.923

My engine is a 130.923 and one of the what I think to be "Timing Chain Guide Rail Pivot Pin" (s) are missing from the front of the engine.


My question is are they both the same? or is there a specific pin for the upper and lower holes.

I ask because the ones I've found online varied a bit in size and shape and I'm not sure which one is which, or if there are even specific pins for each hole.

And also, how would I go about installing the replacement pin? would it be a matter of just putting it back in? or would that be too easy.

Looking forward to a response.

Thanks
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post #2 of 7 (permalink) Old 08-21-2014, 02:24 PM
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both of those should be same size and should be able to just slide in and tap with hammer. you should remove valve cover just to make sure the guide is straight when pin goes in there is a hole in guide that it needs to be in. i put a bolt in end and tap in with small hammer when bottmed out remove bolt put valve cover back on and drive

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post #3 of 7 (permalink) Old 08-21-2014, 06:31 PM Thread Starter
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Thanks so much for the reply.

OK and I think it would be wise to have a spare valve cover gasket on hand hey.

We only have a couple weeks of summer left here in Newfoundland so I want to get it on the road asap.

I just don't feel right driving the car without that plug spewing oil everywhere.

the person who owned it before me used it for, what seems to be, quite a while with that pin missing.

Does anyone know how or why those pins would be loose/missing. The parts sales manager guy Tim said those pins are normally next to impossible to remove so I'm really confused about that.
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post #4 of 7 (permalink) Old 08-22-2014, 06:29 AM
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they are usually a pretty tight fit. I would NOT use locktight, but maybe a dab of silicone on the outside after you put them in if they are loose, just to keep them from coming out again.

While you have cover off, check valve adjustment.
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post #5 of 7 (permalink) Old 08-22-2014, 08:31 AM
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Those pins are a press fit and if installed correctly will not come out on there own. Most are removed with a slide hammer so they should be tight. When you install new make sure you tap it in with a hammer until it bottoms out

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post #6 of 7 (permalink) Old 08-22-2014, 02:28 PM Thread Starter
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Thanks for the replies.


Upon further investigation I've found that the timing guide is missing alsoi put one of those cameras with a light on it in the valve cover (very carefully) and seen that there is no guide there at all.

So I'm going to order one now and hopefully have it for next week.

Is installing that a matter of just laying it in and securing it with those pins?

Thanks so much
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post #7 of 7 (permalink) Old 08-22-2014, 03:08 PM
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If the guide is missing you might need both pins the chain might have cut grooves in the on that's there. If it did remove any burrs on it before removing you don't want to gouge head when removing. Install is easy just set it against the chain and line up the holes slide pins in tap till they bottom out. If they slide in easy than a sealer 1/4 inch from end of pin might be warranted.

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