Snapped an intake manifold bolt... argh
Snapped an intake manifold bolt... argh
I was replacing the disintegrating and ineffective cork gaskets with new OEM MB gaskets + copper sealant today and got everything all ready to go and started tightening the intake manifolds. Finger tight, then 5 ft/lbs, then 10 ft/lbs. Everything looked good, then my first bolt to 15 ft/lbs... SNAP.
Sigh.
So my first question is... 15 ft/lbs is the correct specification for tightening the intake manifold bolts w/ a stock metal gasket, correct? I saw a few spots on the forum that said 10 ft/lbs but I believe those are for the cork gaskets. The SRT6 (which is what I have) service manual says 15 ft/lbs. And if it is 15 ft/lbs, why the heck did it snap on me? I had the correct setting on my torque wrench.
Second question, does anyone have a part number for a new set of bolts? I would prefer not to spend 50 bux on a new set of bolts, so if someone has a spare that I could buy off of them that would help me tremendously.
It's this one:
o
o o
o x
o
(Left manifold, center bolt closest to front of car, shown as x in my crude diagram)
Luckily it didnt snap flush to the block, there's about an inch poking out from the bottom. I'm assuming pliers and a strong grip will do it?
Thanks!
Sigh.
So my first question is... 15 ft/lbs is the correct specification for tightening the intake manifold bolts w/ a stock metal gasket, correct? I saw a few spots on the forum that said 10 ft/lbs but I believe those are for the cork gaskets. The SRT6 (which is what I have) service manual says 15 ft/lbs. And if it is 15 ft/lbs, why the heck did it snap on me? I had the correct setting on my torque wrench.
Second question, does anyone have a part number for a new set of bolts? I would prefer not to spend 50 bux on a new set of bolts, so if someone has a spare that I could buy off of them that would help me tremendously.
It's this one:
o
o o
o x
o
(Left manifold, center bolt closest to front of car, shown as x in my crude diagram)
Luckily it didnt snap flush to the block, there's about an inch poking out from the bottom. I'm assuming pliers and a strong grip will do it?
Thanks!
Last edited by mjgroves; 11-22-2016 at 08:48 PM.
Re: Snapped an intake manifold bolt... argh
l run in a tap to each hole before replacing a bolt to be sure the threads are clear, using my fingers without the handle. Then using the handle, I run it in and out as the aluminum is not forgiving. 15 ft pounds should be ok but is your torque wrench able to be set there??? ie is it the same one that you use on head bolts?? I got an inch pound wrench as a smaller tool is needed here. Enjoy WDY
Re: Snapped an intake manifold bolt... argh
l run in a tap to each hole before replacing a bolt to be sure the threads are clear, using my fingers without the handle. Then using the handle, I run it in and out as the aluminum is not forgiving. 15 ft pounds should be ok but is your torque wrench able to be set there??? ie is it the same one that you use on head bolts?? I got an inch pound wrench as a smaller tool is needed here. Enjoy WDY
These are stock bolts, but don't seem to take 15 ft/lbs. ???? Im confused.
EDIT: Is it possible I'm looking at the wrong specs? I'm trying to tighten the 6 bolts for the bolt holes you see in this picture:
I am using stock mercedes gaskets that go in between these and the block.
Last edited by mjgroves; 11-25-2016 at 04:26 PM.
Re: Snapped an intake manifold bolt... argh
If so, why does Rob list the specs at 10 ft/lbs on the cork gasket page? Difference in material?
NeedsWings Performance Products. NeedsWings Intake Manifold Gaskets
So 15 ft/lbs is wrong, what exactly are these specs for? I see this number all over the forum, what bolts are we talking about for this spec?
Last edited by mjgroves; 11-25-2016 at 11:19 PM.
Re: Snapped an intake manifold bolt... argh
Well, crap. I was looking at "Intake Manifold Bolts - 15 ft/lbs". So you're saying the bolts I am tightening now are "Cylinder Head Cover Bolts - 7 ft/lbs"?
If so, why does Rob list the specs at 10 ft/lbs on the cork gasket page? Difference in material?
NeedsWings Performance Products. NeedsWings Intake Manifold Gaskets
So 15 ft/lbs is wrong, what exactly are these specs for? I see this number all over the forum, what bolts are we talking about for this spec?
If so, why does Rob list the specs at 10 ft/lbs on the cork gasket page? Difference in material?
NeedsWings Performance Products. NeedsWings Intake Manifold Gaskets
So 15 ft/lbs is wrong, what exactly are these specs for? I see this number all over the forum, what bolts are we talking about for this spec?
What finish do you have on yours? Teflon?
Last edited by onehundred80; 11-25-2016 at 11:37 PM.
Re: Snapped an intake manifold bolt... argh
srt6 gasket and bolt torque specs 9-853 in the service manual
the picture in post 8 is cut off just shy of showing the next line which reads
Intake plenum to supercharger bolts at 7 ft/lbs, 10nm or 88 in/lbs
the "Intake manifold" line showing 15 ft/lbs I assume is referring to a NA intake manifold being bolted to the heads. this should be the same holes as the "supercharger to cylinder head bolts" that shows 17ft/lbs
Mercedes does not make service manuals, we lucked out when Chrysler realized that Americans would demand a service manual so we kind of got to take what Chrysler made us and overlook a few mistakes in there. the slk and c-class owners lucked out with the crossfire manual as well, or at least those that have realized it.
the picture in post 8 is cut off just shy of showing the next line which reads
Intake plenum to supercharger bolts at 7 ft/lbs, 10nm or 88 in/lbs
the "Intake manifold" line showing 15 ft/lbs I assume is referring to a NA intake manifold being bolted to the heads. this should be the same holes as the "supercharger to cylinder head bolts" that shows 17ft/lbs
Mercedes does not make service manuals, we lucked out when Chrysler realized that Americans would demand a service manual so we kind of got to take what Chrysler made us and overlook a few mistakes in there. the slk and c-class owners lucked out with the crossfire manual as well, or at least those that have realized it.