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  #1  
Old 06-20-2013, 10:04 AM
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(Double) Checking Timing Chain Stretch

Morning Merc-guru's,

Finally got around to checking the timing chain (err...remembered to check it) when doing my normal (maintenance) valve adjustment. Having never done it before I wanted to get confirmation that I'm reading this right...I used the 2 mm method described in the FSM...and it looks like I'm at 12* (If I'm reading the FSM correctly, the target is 11* so I'm pretty happy) If I'm reading this right. Thoughts?


'85 300D 167000 mi. 70k of which are mine.
617.952 engine
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(Double) Checking Timing Chain Stretch-timing-6-19.jpg  
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  #2  
Old 06-20-2013, 07:08 PM
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Quote:
Originally Posted by 300dOwner View Post
Morning Merc-guru's,

Finally got around to checking the timing chain (err...remembered to check it) when doing my normal (maintenance) valve adjustment. Having never done it before I wanted to get confirmation that I'm reading this right...I used the 2 mm method described in the FSM...and it looks like I'm at 12* (If I'm reading the FSM correctly, the target is 11* so I'm pretty happy) If I'm reading this right. Thoughts?


'85 300D 167000 mi. 70k of which are mine.
617.952 engine
I would be happy with 4 or 5 degrees but would start thinking about a new chain, at 11 degrees I would be ordering my new chain and reading up on the job.
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Old 06-20-2013, 08:46 PM
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Very timely for me. I did my valves last fall but did not check the chain ( long story ) Then today I am driving down the road and ticking off items I need to repair on the SD this weekend. I looked down at the odometer and crud she just hit 216,000 miles SOOOOOO ! One more item for the list. But on a high note she is running so damn good !
Alan
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Old 06-20-2013, 10:24 PM
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Well...I thought I was ok



A bit confused here and wanting to get things clarified....what timing should ideally be displayed??

Attached are 2 of the pages I went by in the Service Manual

See Step 7 in the first pdf referencing "intake valve opens" and the chart in the second pdf re: the 11* timing..

Thoughts ???
Attached Files
File Type: pdf FSM 215:4.pdf (244.7 KB, 118 views)
File Type: pdf FSM 220:1.pdf (263.4 KB, 113 views)
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Old 06-20-2013, 10:50 PM
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I need to do this this weekend for my 81 240. The FSM is as clear as mud IMHO on what all this means? Is there a step by step write up for idiots like me?
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Old 06-20-2013, 11:13 PM
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When you are doing the 2mm Method what ever degrees you end up with and see on the Crank Damper you need to compare to the chart in the Factory Service Manual to see the actual degrees that it is off.
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Old 06-21-2013, 12:22 AM
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Thanks 911....I believe I'm all set then
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  #8  
Old 06-21-2013, 12:24 AM
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NC-Diesel

I hit the manual for my info but shoulda searched a bit more .... there's just a huge amount of wisdom on this site ... like this:
PeachPartsWiki: Measuring Timing Chain Stretch
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  #9  
Old 06-21-2013, 12:27 AM
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Quote:
Originally Posted by 300dOwner View Post


A bit confused here and wanting to get things clarified....what timing should ideally be displayed??

Attached are 2 of the pages I went by in the Service Manual

See Step 7 in the first pdf referencing "intake valve opens" and the chart in the second pdf re: the 11* timing..

Thoughts ???
You are correct. The spec per your procedure is 11 ATDC for a used chain.

Others are confused...........as usual.
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  #10  
Old 12-03-2013, 12:43 AM
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Checking timing chain

Bring the cam mark up to alignment with the notch at #1 cylinder near TDC.
Read the degrees on the crankshaft pulley.
If the reading is above 5 degrees you should consider a new chain and tensioner.
Snapped old stretched cam chains destroy diesel engines.
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  #11  
Old 12-03-2013, 04:37 AM
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Quote:
Originally Posted by DB444 View Post
Bring the cam mark up to alignment with the notch at #1 cylinder near TDC.
Read the degrees on the crankshaft pulley.
If the reading is above 5 degrees you should consider a new chain and tensioner.
...
My recommendation is not to do this - well not to do this and rely only this method to ascertain if either a chain should be replaced or an offset key should be fitted.

By all means do this quick check - but the so called 2mm lift method is a much more reliable method.

The problem with the 2mm method is that it is complicated. It is particularly complicated if you are doing it for the first time. But like anything it gets easier each time you do it.
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