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#1
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Rotate Crankshaft Before R&Ring Vacuum Pump?
For some reason my searches are not locating any any threads on how to replace a vacuum pump on a MB diesel. Lots of them saying to do it though.
It doesn't look very hard but I was mostly wondering if you first need to rotate the crankshaft to a specific position to relieve compression on the vacuum pump spring to facilitate easier removal and installation. Thanks.
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1993 W124 300D 2.5L Turbo, OM602.962 2000 Chevrolet Cavalier, 2.4L DOHC 2002 Ford Explorer, 4.0L SOHC 2005 Toyota Prius, 1.5L http://www.fuelly.com/sig-us/40601.png |
#2
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I turned mine to "OT" and had no problem with spring tension it was on my 603 but from what i have read the 602 is the same. Don
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Red Green "This is only temporary,Unless it works!" 97 E300D 157000 miles 87 300TD ?141k? miles |
#3
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I've never really noticed if the crankshaft pulley is marked. I look for the "0T"...zero degrees TDC I guess?
Thanks for the tip btw.
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1993 W124 300D 2.5L Turbo, OM602.962 2000 Chevrolet Cavalier, 2.4L DOHC 2002 Ford Explorer, 4.0L SOHC 2005 Toyota Prius, 1.5L http://www.fuelly.com/sig-us/40601.png |
#4
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I dont think you can know where to rotate the engine to release the tension on the VP before you pull it. Shouldn't be a problem, just be very careful with a bottom allen, its easy to strip out. On reinstalling the V/P line up the valleys "up and down" on the little "roller coaster track" of the timing device, that will mean the V/P will not be under pressure.
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1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
#5
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I don't know at what t timing mark the crank needs to be to relieve the pressure off the vacuum pump, but it's not TDC. I don't know why they didn't design it that way, but at TDC, the roller bearing of the vacuum pump is against one of the cams of the timing gear.
There is no reason that I know of that the pump needs to be put on at TDC. I would rotate the crank until the vacuum pump can be inserted without pressing against the timing gear.
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Michael LaFleur '05 E320 CDI - 86,000 miles '86 300SDL - 360,000 miles '85 300SD - 150,000 miles (sold) '89 190D - 120,000 miles (sold) '85 300SD - 317,000 miles (sold) '98 ML320 - 270,000 miles (sold) '75 300D - 170,000 miles (sold) '83 Harley Davidson FLTC (Broken again) :-( '61 Plymouth Valiant - 60k mikes 2004 Papillon (Oliver) 2005 Tzitzu (Griffon) 2009 Welsh Corgi (Buba) |
#6
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That's how I've done it before.
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress. |
#7
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Quote:
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1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
#8
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X2 Some pressure during removal may actually help break the pump loose. Start with the bottom screw and loosen all before you remove any.
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Charles 1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/mercedes-benz-cars-sale/296386-fs-1-owner-83-mb-300d-turbo-rebuild-parts.html |
#9
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I appreciate all the tips...thanks!
On the 602 I can see the cam lobes on #1 when I remove the oil fill cap. If I knew where to position the lobes to place the timing gear in the correct position for zero vacuum pump compression I could do it that way.
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1993 W124 300D 2.5L Turbo, OM602.962 2000 Chevrolet Cavalier, 2.4L DOHC 2002 Ford Explorer, 4.0L SOHC 2005 Toyota Prius, 1.5L http://www.fuelly.com/sig-us/40601.png |
#10
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What I am trying to say is "there is no need to know" even if you could tell by looking into the oil fill.
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1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
#11
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Quote:
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1993 W124 300D 2.5L Turbo, OM602.962 2000 Chevrolet Cavalier, 2.4L DOHC 2002 Ford Explorer, 4.0L SOHC 2005 Toyota Prius, 1.5L http://www.fuelly.com/sig-us/40601.png |
#12
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No, I don't think so, Like CR said, might help. You cant tell where the roller is anyway before removing the VP.
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1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
#13
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Answer
Quote:
http://www.peachparts.com/shopforum/diesel-discussion/229331-vacuum-pump-rebuild-thread.html#post1927867 |
#14
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I was under the impression the 602 pumps could not be rebuilt?
The Pierburg R&R instruction say to pour 50 ml of fresh motor oil into the new pumps suction port when the engine is running. I guess either port will be OK, right? This is to fill the space behind the gasket dam for initial lubrication, correct? Also, any sealant needed for that metal gasket? Nothing is mentioned in the instructions about this however. Thx!
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1993 W124 300D 2.5L Turbo, OM602.962 2000 Chevrolet Cavalier, 2.4L DOHC 2002 Ford Explorer, 4.0L SOHC 2005 Toyota Prius, 1.5L http://www.fuelly.com/sig-us/40601.png |
#15
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I was also under the impression that the 60x pumps could not be rebuilt. There is no rebuild kit available.
Maybe I should look at this rebuild thread... There are 7 rebuild threads in the above link. Which one is for the 60x???
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Michael LaFleur '05 E320 CDI - 86,000 miles '86 300SDL - 360,000 miles '85 300SD - 150,000 miles (sold) '89 190D - 120,000 miles (sold) '85 300SD - 317,000 miles (sold) '98 ML320 - 270,000 miles (sold) '75 300D - 170,000 miles (sold) '83 Harley Davidson FLTC (Broken again) :-( '61 Plymouth Valiant - 60k mikes 2004 Papillon (Oliver) 2005 Tzitzu (Griffon) 2009 Welsh Corgi (Buba) |
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