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240D oil pump rebuild
My '76 240D w115 oil pump seems to be losing its prime after sitting for long periods of time. On initial startup it takes a full 10 seconds to peg the oil gauge. I'm sure it is not the gauge, because the engine is definitely smoother and quieter once it reads full pressure. Once on the road, it behaves quite well, holds appropriate pressure, and doesn't smoke any more than expected. It only sees about 200 miles per year, but I'm afraid to start it up too many more times before I attempt a fix. I know the pump is still available, but I recall seeing somewhere deep in the forums that someone here rebuilt their pump, complete with instructions and part numbers. That thread has proven to be elusive, despite numerous searches. Can anyone help with this? Has anyone here rebuilt their own oil pumps? It should be noted that this is a relatively new issue. Before last year, the gauge took just a couple of seconds to rise to the top. Now it is much longer.
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1981 240D 4sp manual. Ivory White. |
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? Guessing you're talking about the 6 & 7 MM O-Rings in the oil filter's shaft ? .
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-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better |
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Those are the two.
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1981 240D 4sp manual. Ivory White. |
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Never had to deal with that area thankfully. Do the two o rings prevent the oil draining down when the engine is off if functional? If so you could not develop readable oil pressure until the filter chamber is refilled first.
I am sure of nothing in this area but just some thoughts. More likely wrong but why not just change the old probably bad very tired old o rings and see what results? I certainly would before digging into the oil pump. Many oil filter setups if not most have an anti drain back valve. Those o rings are probably well over any reasonable service life expectation of use anyways. New oil filters of some brands even include the o rings I think. Actually the first poster to respond pointed out that indeed they created an identical problem on his car. Last edited by barry12345; 05-17-2018 at 04:43 PM. |
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Oil Pressure Issues
Thanx Shern ;
I have the very same issue in my '82 240D and was wondering what to look at next since the rest of the engine is essentially new . I was wondering if there was an anti - drainback valve in that canister .
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-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better |
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Thanks, I changed all the o rings on the last oil change. It's due again, since it's been well over a year (closer to two). No rush because it's only been about a thousand miles. When I change it again, I'll change the o rings too. The oil pan is dented--been that way since I got it, and I have a new one to put on. Since I'm doing that, the oil pump is right there. That being said, I'll remove the filter canister first and confirm that the o rings are in there, and in the right place.
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I am wondering the same thing about the oil pump. Seems a check valve, if there is one, may be getting weak. The car only has 76k miles but sat in a garage for many years.
Last edited by 76w115; 05-17-2018 at 09:39 PM. |
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OM616/617 Oil Filters
? I thought they were all the same ? .
Mine too is out side the engine, left rear .
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-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better |
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The OP has a W115= different in many ways.
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All Diesel Fleet 1985 R107 300SLD TURBODIESEL 2005 E320 CDI (daily) LOTS of parts for sale! EGR block kit http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html 1985 CA emissions 617 owners- You Need This! Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst. Sanden Instalation Guide (post 11): http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html |
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Halfway through 1976 they changed to the w123. Mine is a March 1976, still a w115. Confusing sometimes to get parts, you really have to enter the vin number, especially when ordering from the dealer.
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Does the oil filter housing have the spring at the inside bottom and both filters in it i.e., the primary and the secondary. Check that the camshaft oiling tube is in place, not loose and creating a loss of pressure.
How bad is the dent in the oil pan? Does it seem bad enough to be related...causing a restriction in the rubber foot on the oil pump pick-up screen? Also check that the pump is bolted up tightly. Good luck and keep us posted!!!
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"Rudeness is a weak man's imitation of strength" - Eric Hoffer |
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I too thought that was a gas engine only set up of an early vintage. You might consider posting this problem in the vintage section of the site as well. It also was mounted horizontal as well. I never owned a 115 diesel. Or is it basically the later diesel filter set up just mounted lower? Well since it has O rings in there it is not like the gas engine oil filter setup. After some thought it possibly is just the same type filter housing mounted in a different location on the block. I guess I still learn something every day. This model in diesel was really scarce even when new in my current area of the country. At the time the 114 gas models sold fairly well. I saw no visual difference between the 114 and 115 models. Anyways it probably still is just the o rings. A pretty easy fix. Still there was a 114 coupe with this engine in it sold used locally about ten years ago that sounded factory. Special order I wondered or converted? Last edited by barry12345; 05-18-2018 at 06:51 AM. |
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Thanx for the clarification Rich ! I'd missed that .
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-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better |
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