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Old 03-04-2002, 10:18 AM
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Join Date: Oct 1999
Location: New York City Burbs
Posts: 177
What Size?? 190E Timing Chain Tensioner Nut

I am finally going to get to that timing chain job that I have been avoiding for a couple of months for my 84 190E 2.3 gas motor.

What size allen socket do I need to get the chain tensioner cap nut off?

I dont want to rip the alternator out and then find out I dont have the right tools, only to prolong the job another week.

Thanks folks.
Patrick Leber
'84 190E 2.3
'83 Porsche 944 (track car)
'84 Porsche 944 (parts car)
85.5 Porsche 944 (sled)
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Old 03-04-2002, 01:52 PM
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Join Date: Sep 2001
Location: Lathrup Village, Michigan
Posts: 2,939
I think you need a 12mm for the plug and a 17mm for the outer ring. This was answered more completely a few months ago when I did my rebuild. You can search on my username and 'tensioner'.
Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
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