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#1
11-26-2010, 07:28 PM
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Bumping the engine
Hi,
I know this has been discussed before, but searching via phone isn't helping me much. For a w123, what is the best way to turn the engine electrically, for compression testing or valve adjustment? I don't have a device to do it, but I guess it is really two wires, right? What do I jumper to do it? Thanks!
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Current Diesels: 1981 240D (73K) 1982 300CD (169k) 1985 190D (169k) 1991 350SD (113k) 1991 350SD (206k) 1991 300D (228k) 1993 300SD (291k) 1993 300D 2.5T (338k) 1996 Dodge Ram CTD (442k) 1996 Dodge Ram CTD (265k) Past Diesels: 1983 300D (228K) 1985 300D (233K) 
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#2
11-26-2010, 08:34 PM
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on the passanger's fender near the battery, three screws in a junction block with a plastic cover. jumper one of the large screws to the small screw.
most 240's don't have it though. for a 240, you'd need to attach the wires to the starter solenoid itself...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#3
11-26-2010, 08:48 PM
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For a valve adjustment I use the crank bolt, you can be much more precise with rotating the cam to the correct position. It's 27mm socket.
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Andrew '04 Jetta TDI Wagon  '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#4
11-27-2010, 06:24 AM
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For valve adjustment, I use the key. I can look through the gap under the open hood with the valve cover off and see the front couple lobes on the cam, so I can see how far I'm bumping the engine over. I haven't done a compression test, but I'd probably use the key and a helper.
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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.
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#5
11-27-2010, 06:46 AM
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See Crank shaft front?
for the crankshaft manual option
__________________
1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior  Don't leave that there - I'll take it to bits!
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#6
11-27-2010, 08:38 AM
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I typically do turn the engine by the 27mm on the crank. However it doesnt help for compression, and getting up and down doing valves is annoying.
I think for valves from now on Ill remove the GPs to make turning easier and be able to visually examine them.
__________________
Current Diesels: 1981 240D (73K) 1982 300CD (169k) 1985 190D (169k) 1991 350SD (113k) 1991 350SD (206k) 1991 300D (228k) 1993 300SD (291k) 1993 300D 2.5T (338k) 1996 Dodge Ram CTD (442k) 1996 Dodge Ram CTD (265k) Past Diesels: 1983 300D (228K) 1985 300D (233K)
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#7
11-27-2010, 08:56 AM
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Turning by hand give you more control, less power. One poster year or 2 back broke a valve when adjusting them, here's how.
Was adjusting a tight valve, kept turning the cap CCW (wrong way) to create clearance, which he never got. HMM, not sure why. Had the wife bump the starter so he could go on to the next one. BANG! Cap and part of the valve flew off who knows where. He had turned the cap enough to create a TDC interference with the piston. Winding the motor manually would have caught the mistake w/o harm. =8-0
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CC: NSA All things are burning, know this and be released. 82 Benz 240 D, Kuan Yin 12 Ford Escape 4wd You're four times It's hard to more likely to concentrate on have an accident two things when you're on at the same time. a cell phone. www.kiva.org It's not like there's anything wrong with feeling good, is there?
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#8
11-27-2010, 09:34 AM
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I'm sorry to have gotten it the effect of the Bowden cable and the vacuum control the wrong way round - I've added an Edit in my post (#2) with an apology!
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1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior Don't leave that there - I'll take it to bits!
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