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Old 08-25-2001, 05:21 PM
Coming back from burnout
Join Date: Jun 1999
Location: in the Pacific Northwest
Posts: 2,274
Direction of Engine Rotation CCW or CW ?85 300D

Can anyone tell me where I can find the direction of engine rotation on an 85 300D Turbo? I watched my 83 240D run and it is clockwise, but i dont want to guess--i am changing my timing chain. Thanks
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Old 08-25-2001, 06:10 PM
Join Date: Jul 2001
Location: Old Lyme, Connecticut
Posts: 3,596

They turn the same direction, but to make sure just inspect the fan. The engine direction of rotation is such that the fan turns to draw air through the radiator and then blows back on the engine (the air flow from the fan is in the same direction air flows with the car running, from front to back). The pitch of the blades should be such that when it is driven the blades push air from front to back.

I am more than certain the direction of rotation is clock wise, and I just checked my 350SD, and it is clock wise.

So, it sounds like you are back in business. Did you get the old chain back up out of the "chain box" at the front of the engine without taking the injection pump stuff and the crankshaft gear off? Good luck, Jim
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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Old 08-25-2001, 07:32 PM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 11,878
Clockwise as you face the engine for sure for the '85 300D.
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Old 08-25-2001, 09:18 PM
Coming back from burnout
Join Date: Jun 1999
Location: in the Pacific Northwest
Posts: 2,274
The engine is "sticking"

It won't turn CW!! The engine is jammed--I know why!
I fished the chain out, both sides. I was elated! I used piano wire! One second later I dropped a chunk of wire into the engine; my hands were slippery with oil from the chain.I took off the bottom oil pan to look for it and i couldnt see it.

With my luck I will have to pull the engine or disassemble thr front completely.

I am haunted!!
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Old 08-26-2001, 08:40 AM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 11,878
When you say the engine is "sticking" is this with the chain in place or not. If the chain is not in place then yes it is going to "stick" everytime the top of that piston hits that valve. If the chain is in place then the timing is not set right. Get a techs input but if you have been able to get the chain back in place you should be able to set the timing. If I were in this position I would try to get the marks lined up on the crank with the #1 at TDC and the cam mark lined up with the #1 to be in the TDC position. You should be able to tell when the camshaft is TDC on the #1 because both cam lobes will be in the "up" position. The will not be directly up but will be further away from the piston versus when the #1 piston is at TDC on the exhaust stroke. For what it is worth I have put a pic on here that shows what I do whenever I cut or mess around with a timing chain.

I would try moving a magnet around in the chain housing area to try to find the wire and remove it.
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Old 08-26-2001, 02:49 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
From your current position, I would suggest removing the rocker stands. By doing this the valves will stay closed. This will allow you to get the chain back together and be able to roll the motor over. Do that first and then with them still off set the crank on one and pull the cam gear off and set the cam right. Roll your chain in leaving the rockers off. You might want to remove the injectors so the engine will turn easier.

It is entirely possible that the injection pump timing has stayed correct versus the crank (as long as you do not confuse number 1 and number 4 cylinders (only the injection pump cares, the crank and cam don't). This is really important, remember it, if it don't start when its back together. You may be able to turn the cam 180 and have it be right. Let me know if you don't understand what I'm talking about here.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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