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Belleville washers

Posted: Sun Aug 23, 2015 10:36 pm
by Juro
The four center bolts on the intake manifold include Belleville washers.

What is their purpose? There are two per bolt.

Re: Belleville washers

Posted: Mon Aug 24, 2015 10:18 am
by 3X00-Modified
um... never heard of this type of washer being used on the intake... I'm guessing someone put those there and they weren't there before. Especially if there are two per bolt... GM would never do something like that.

Re: Belleville washers

Posted: Mon Aug 24, 2015 7:25 pm
by Asylum
Ya that is something you would never see on our cars.

On an Intake manifold? WHY?

Re: Belleville washers

Posted: Thu Aug 27, 2015 7:35 pm
by Juro
Service Manual shows them here:

service manual.pdf
(642.71 KiB) Downloaded 117 times
service manual2.pdf
(552.21 KiB) Downloaded 131 times

Re: Belleville washers

Posted: Thu Aug 27, 2015 7:43 pm
by Asylum
Well throw the damn things away. You don't require them!

There is absolutely no pressure or force there for that requirement.

Both Jon and I have quite a bit of experience with these engines, and they are not required!

:beer:

Re: Belleville washers

Posted: Thu Aug 27, 2015 8:45 pm
by Juro
What about that big speech about GM engineers?

Re: Belleville washers

Posted: Thu Aug 27, 2015 8:51 pm
by 3X00-Modified
I guess it would have helped to identify lower intake manifold... Would have made a bit more sense.

And to add to it if it's in the manual then why are you asking about it?

The lower intake is held down with 4 long bolts on the 3x00 motors and there is only a single washer that's center is rubber lined... The dual stacked washes is what made me think it was not an original item.

Re: Belleville washers

Posted: Thu Aug 27, 2015 10:01 pm
by Juro
"intake manifold" per Service Manual

Curious

again, Service Manual shows two per bolt

Re: Belleville washers

Posted: Fri Aug 28, 2015 8:54 am
by 3X00-Modified
Yes there is an UPPER and a LOWER... Clarity on what your describing can sometimes help eliminate confusion.

And once again I say... if your going by the "book" why are you asking about them... Just use them.

If you want to know why they are used then just look up what they do...

https://en.wikipedia.org/wiki/Belleville_washer

Re: Belleville washers

Posted: Mon Aug 31, 2015 10:13 am
by Stencil
If I recall correctly, my 2.8 and 3.1 engines had the dual washers on the lower intake manifold as well. I don't recall seeing them on the 3x00 setups.

Re: Belleville washers

Posted: Wed Sep 09, 2015 7:30 pm
by CorvetteBeretta
Mine have 2 also and all the extra bolts I have 2, I've never changed them.