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  #1  
Old 10-11-2008, 04:13 PM
Willjayc
 
Join Date: Dec 2006
Location: Orillia, Ontario
Posts: 53
240D Cam Timing/Possible tooth slip?

I just bought a 1981 240D, (my birth year car!) after selling my two previous MB's ('77 300D and '79 240D) about 6 months back. This new one is a beauty find for somewhere like Ontario where we don't get too many that are not full of holes.

First on my list was an oil change and valve adjustment, which I have done well over a dozen times before, but apparently I'm a little rusty, I was turning the engine backwards for a few valves before I realized. I've turned everything back proper (clockwise, which I think I'll never forget again) and adjusted all of the valves. Now when checking my cam timing by lining up the cam notches, my crank is retarded by about 6 degrees. I didn't check it before, was it likely set like this or Did I skip a tooth?

I have read all of the searches I can find on timing and cam timing and found mention of skipping a crank tooth equal to about 7 degrees....did this likely happen by cranking the engine backwards?

Is it an issue? How can I fix it?

I'm afraid to start the car!

Help much appreciated.

Thanks,

Will

PS....I was turning the engine over by the crankshaft nut and not the camshaft nut.


Last edited by willjayc; 10-11-2008 at 05:01 PM.
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  #2  
Old 10-11-2008, 06:09 PM
Stevo's Avatar
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Join Date: Apr 2002
Location: NW WA
Posts: 6,299
I believe is more like 18, but you need to check the IP timing. Your crank/cam timing is off 6 degrees which means its time for a new chain. If your IP timing is off it will be very hard to start, I would fire it up.
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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"
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  #3  
Old 10-11-2008, 07:52 PM
Willjayc
 
Join Date: Dec 2006
Location: Orillia, Ontario
Posts: 53
I had the car running after I bought it for a few days and it seems to run like a dream compared to my last two MB's when I picked them up.

FYI: Milage is 249,000 km (152,000 miles), I plan on doing the timing chain soon.

Thanks for the advice. I think I'll start it up.
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Old 10-11-2008, 09:33 PM
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Join Date: Apr 2002
Location: NW WA
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I think allot of folks have turned the engine backwards before they found out it was a no no. With 6 degrees of stretch I would think it possible to jump a tooth, but hopefully all will be well.
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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"
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  #5  
Old 10-11-2008, 10:14 PM
Registered Hack
 
Join Date: Mar 2008
Posts: 4,642
I still do not understand how this is possible. The chain tensioner has a locking mechanism that keeps it from retracting when there is no oil pressure. I can't imagine how enough slack is generated on either side to jump a tooth anywhere.
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Old 10-11-2008, 10:24 PM
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Join Date: Nov 2004
Location: Nova Scotia, Canada.
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The ratcheting tensioner was introduced into production in a certain year I am unware of. Chances are it's chain stretch.
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  #7  
Old 10-12-2008, 12:19 AM
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Join Date: Apr 2002
Location: NW WA
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I don't believe any tensioners for the 616s are ratcheting.
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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"
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  #8  
Old 10-12-2008, 12:32 AM
ForcedInduction
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7 degrees is worn but fine, throw an offset woodruff key in the cam gear and adjust the injection timing.

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