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Old 04-19-2007, 10:37 PM
d.delano's Avatar
Join Date: May 2004
Location: DC
Posts: 1,466
617 exhaust manifold studs

I have a leak at the manifold gasket, and was wondering if the studs were as prone to siezing and breaking off as on the 602/603 aluminum block engines. I was planning on using a fair amount of PB and heat as a precaution. Any advice on proceeding with this would be greatly appreciated as I'm pretty nervous about it.

'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)
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Old 04-19-2007, 11:05 PM
Posts: n/a
Any 22 year old exhaust nut has a good chance of breaking off from thermal cycling stress and rust.

Soak it with PB a few times and let it soak overnight if possible. You might even get a handheld propane torch and heat up the nuts really well if they resist coming loose.

Once you are ready to put it together, use lots of high-temperature anti-seize on the studs and new nuts.
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Old 04-20-2007, 05:40 AM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 37,990
otoh the benz fasteners are the least likely to break of anything i have ever worked on.

just be careful and use the pb and heat if necessary. make sure you have your wrench or socket fully seated. if it is a tough nut get a high quality six point socket on it too.

good luck

tom w
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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Old 04-20-2007, 02:48 PM
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Join Date: Jan 2007
Location: Taylorville, Il.
Posts: 157
the best penetrating oil I have found is Free All its not cheap but it will break anything loose if you let it soak long enough and the good old gas wrench doesnt hurt I think free all is around 8 bucks a can but its a good investment
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Old 04-21-2007, 10:52 AM
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Join Date: Mar 2005
Location: SoCal
Posts: 660
Most likely(or hopefully) you'll unscrew the stud from the block if the nut is stuck.
'85 300D Cal 280,000 miles
'07 C230 37,000 miles
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Old 04-21-2007, 12:52 PM
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Join Date: Jul 2004
Posts: 7,342
The best is KROIL used overnight- and several times overnight if you have the luxury. Then you have the old stand by of melting candle wax on the threads- it seeps into and frees the frozen hardware. Old "blue lips" is also the ticket.

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