I need help to find out what is happen to my 68 250 - Page 2 - Mercedes-Benz Forum

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post #11 of 15 (permalink) Old 03-28-2010, 03:20 PM Thread Starter
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Date registered: Feb 2010
Vehicle: 1967 230s, 1968 250
Location: PA
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finally i drain the oil and change the oil flter.there was little broken pices of brass and metals in the filter and the oil pan . I clean it and pure new oil, started right up, but there comes the knocking when the engine goes high and there is tiny bubbles in the oil, and the antifreeze is still clean. any body knows what is happening.
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post #12 of 15 (permalink) Old 03-28-2010, 03:48 PM
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Is the oil milky and foamy looking after it's run for a while? Did you try removing the spark plug wires one at a time when it's knocking, as I indicated above? Did you remove the valve cover and check that out? Sounds like it's something in the lower end if you're pulling pieces out of the filter an pan, or possibly timing chain tensioners. If it's the chain tensioners, you can also get an idea with the valve cover off. You can use a flashlight and look at the chain (looseness) and maybe (I don't remember) see a tensioner. The spark plug check will tell you if it is a lower end bearing problem. Is it still running smoothly on all cylinders?
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post #13 of 15 (permalink) Old 03-29-2010, 04:58 AM Thread Starter
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Date registered: Feb 2010
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No it's not foamy or milky. it just have about two or three tiny dots when i pull out the dipstick. i'm not even sure if its a bubble because its so tiny.the engine still runs smooth but then if i give it heavy acceleration, it knocks like using a small hammer on a solid metal.I didn't get to do the rest of the test then got cought up with the rain. i will check it during the week
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post #14 of 15 (permalink) Old 03-29-2010, 09:43 AM
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Good luck, Joey. The way you describe the noise, "small hammer on solid metal", doesn't sound too good. Have you been able to ascertain whether the noise is coming from top or bottom? The way you describe it sounds like the bottom end though. Let's hope it's not.
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post #15 of 15 (permalink) Old 09-03-2012, 10:23 AM
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Date registered: Jul 2012
Vehicle: 1967 250S, twin Weber carbs, automatic trans, power windows, A/C, R134a conversion
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You have a bad rod that requires replacement. The engine needs to be pulled out for the work. The problem will get worse each time the engine runs. You might be able to determine which rod it is by pulling each spark plug (0ne at a time) and reving the engine. When the knock stops, that's the problem one.
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