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#1
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Oil pump replacement??
Hi all!
Its been a while which means the ol girl has been running fairly well. Till this weekend....... Took her on her first extended road trip in a while. did fine on the way up, on the way back, oil pressure started dropping. she usually pegs at 45 psi, it dropped to 30 while running on the freeway, 0 at anything below 40mph. I pulled over and checked for obvious leaks, proper oil level etc. she had oil, and no major leaks. added a bit of oil just in case, which brought oil pressure up but only for about 5 miles. Parked her overnight, and virtually no oil under car the next morning. Im guessing its a faulty oil pump. Haynes manual has very little about replacing, only place they show it is as part of a lower end rebuild. Im really hoping I dont have to drop the engine just to replace the oil pump..... Any advice/insight on the issue? 1969 230/8 which makes it a m180 engine. thanks so much! Marc |
#2
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I don't know but if it is like the later model benz motors the oil pump can be replaced by dropping the small pan.
Tom W
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#3
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Oil pump failure on my 1963 190c at about 130k miles was slow and gradual, eventually after a year dropping from 10lbs to around 5-7 at idle and dipping to 32 when driven hot gliding along at hwy speeds. Early 4cyl engines were known to wear out pumps, notso much with 6cyl m180's.
Suddenness of yer oil pressure probs tell me it might not be the pump. I'd pull the cluster and check the guage for possible insidious leak behind the dash on yer 114 first. Another culprit could be blockage at sender unit thats spring/ball operated. It's mechanical guage system you understand with hollow tube running from sender to guage coil. Cracked hollow guage coil behind the dash is not uncommon with w123 vdo guages especially, not dissimilar set up to yer w114. Otherwise replacing the pump on my 4cyl 190c wasnt difficult after dropping the pan, pretty much an easy out and in failsafe operation. Hardest part was pulling the pan. New pump was $150 in parts but that was 20 yrs ago. Pump itself is collection of gears that drive oil pressure. Pumps gradually and slowly fail when gaps wear between gear teeth beyond spec.
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'80 300SD/ w116 '79 240D 4-spd '71 750cc Guzzi previously owned: '83 240D 4-spd '77 280SEL 4-spd '74 280/8 '72 250/8 '65 220Sb 4-spd '63 220Sb 4-spd '63 190c 4-spd '61 220Sb 4-spd '60 190b 4-spd |
#4
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Yes,it`s only the small oil pan that has to be removed....
over 350$$ on the russian site...there are some cheaper Febi...Laso...Swag (probably from the same source)-150$$...anyone that has ever tried them?? |
#5
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Agree - before you tear into the pan, you might want to get a reading from another gauge.
If the readings are correct, a clogged filter or a clogged pickup screen, or possibly something blocking the oil return should also be considered
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Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe |
#6
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Ok, thanks! that is heartening news on both fronts. Havent torn into the dash at all yet so thats a good idea. it'll be a week or two till I can get to it, but I'll update asap.
M |
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