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#1
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Timing chain, replace it at 5* stretch now?
Or not? How much stretch is acceptable and if you had the valve cover off on your 1983 300 TDT and a new chain ready to go, would you replace it now or is 5 degrees of stretch no real big deal?
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#2
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I would and eliminate worry.
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1999 w140, quit voting to old, and to old to fight, a god damned veteran |
#3
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How are you measuring it?
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42 |
#4
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That's kinda where I've been leaning! I had the head at a machine shop less than 1000 miles ago and didn't bother to replace the chain then because it looked OK to just drive carefully around town close to home to let everything "settle in."
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#5
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I'm looking at the timing mark on the Camshaft and lining it up with the matchmark on the cam tower while rotating the engine in the normal direction of rotation by turning it at the crank pully. When the Camshaft mark lines up at the cam tower, the harmonic balancer marks are 5* degress late, maybe a slight bit less.
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#6
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I'd worry more about the guides, rails & tensioner than I would about the chain.
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1984 300SD Turbo Diesel 150,000 miles OBK member #23 (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination |
#7
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I did replace the tensioner spring and the slipper foot when I had the head off. The upper guide rails have been replaced as well.
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#8
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Have you got an offset key in the cam sprocket or the "normal" one. I have a 2.5 degree offset key here which would fix your problem if you want it...
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Marty D. 2013 C300 4Matic 1984 BMW 733i 2013 Lincoln MKz |
#9
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5 degrees is not bad, any more and it becomes questionable. The general rule of thumb is replace the chain every 100,000 miles. I know there will be some that will disagree. It's not hard to do, and with the right crimping tool, can be done in a couple of hours. The last one I did was on the 300D, it had several degrees of stretch, a new chain made a world of difference. The worst one I saw had 12 degrees of stretch, surprised it even ran.
There are some users who will rent the correct crimping tool for a small fee and deposit. Check the tool rental forum. Others have used vise grips, it's a real pain in the ass to do, but can be done. If you do decide to replace the chain, use a press on master link. Although it makes the job easier, I have not seen an "easy clip" link in years, they were discontinued from MB in the late '90's.
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DO IT RIGHT THE FIRST TIME, DON'T BE A HACK Political Correctness is NOT part of my vocabulary and finally FIGHT CRIME...SHOOT BACK '82 240D Stick '85 300D Auto Drove my first MB at age 16 1960 300SL W190 Last edited by AMH; 01-22-2009 at 04:37 PM. |
#10
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Quote:
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42 |
#11
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timing chain
Roll a new chain in, it,s that simple.
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#12
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Why risk a bad crimp with a known good chain? Why spend hundreds of dollars when it should only cost a few?
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42 |
#13
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Quote:
I do not know if the chain was previously replaced or there is an offset key installed (never worked up enough intrest to check the key yet).
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84 300D, 82 Volvo 244Gl Diesel |
#14
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This is a factually incorrect statement.
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#15
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The reading you got with the Camshaft Bearing Tower alignment method is a good indication you should check further and use the 2mm method to do so. This would also give you the spec you need to pick an offset key; if you want to use on.
To answer the question I think I would replace the Chain if it goes up to 6 degrees stretch as measured by the 2mm method. If not replacing the Chain I would insert an offset key to return the Camshaft Timing to normal and re-time the IP.
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84 300D, 82 Volvo 244Gl Diesel |
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