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06-10-2006, 06:16 PM
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Threads on cylinder head stripped - Suggestions please
Vehicle : '86 300E M103 Engine
I was replacing the valve guide seals and when I removed one of the four bolts (item 13 in the attached image) that holds the one of the camshaft bearing caps (item 12 in the attached image), I noticed that the threads were stripped. All I did was unscrew the bolt and found that the thread was stripped. Note: In the manual(job 05-2190), it says to replace the camshaft bearing cap bolts (item 13) with longer bolts to avoid threads stripping - so I guess that this is a known issue What are my options. Can I just leave it to let just 3 bolts hold the bearing cap in place, or with the head in place, can I "carefully" drill and tap and install a helicoil. Or, do I have to take the head out to a machine shop and have them do it. Any and all suggestion are appreciated. TIA.
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1986 300E (3/2002) Rear ended and totaled (10/2009) 2000 Xterra (5/2000) 1992 400E (11/2009) -Sold 1986 300E (12/2009) - Sold 2004 E500 Wagon (6/2013) - Sold 
Last edited by hs_300e; 06-10-2006 at 07:03 PM. 
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