Needed spacer
Thread Starter
Le Mans Master
Joined: Feb 2011
Posts: 5,783
Likes: 400
From: Paoli, IN
St. Jude Donor '17, '19
Needed spacer
Hey Guys,
I installed gaskets for my exhaust manifold with a buddy of mine. No issues really, but when we put it all together we noticed we had a small gap between the front bolt of the manifold. That bolt holds up the alternator and then goes through the manifold and secures to the engine. However, there is a small gap, like a nut (or spacer) is missing. Does anyone know what is supposed to be here? I don't know if it was there before we changed it out or not but we don't remember hearing anything drop and we couldn't find anything under the car.
Thanks.
I installed gaskets for my exhaust manifold with a buddy of mine. No issues really, but when we put it all together we noticed we had a small gap between the front bolt of the manifold. That bolt holds up the alternator and then goes through the manifold and secures to the engine. However, there is a small gap, like a nut (or spacer) is missing. Does anyone know what is supposed to be here? I don't know if it was there before we changed it out or not but we don't remember hearing anything drop and we couldn't find anything under the car.
Thanks.
Thread Starter
Le Mans Master
Joined: Feb 2011
Posts: 5,783
Likes: 400
From: Paoli, IN
St. Jude Donor '17, '19
Race Director
Joined: Oct 2008
Posts: 19,295
Likes: 1,681
From: Long Island
The manifold bolts are different lengths - just as info incase you didn't know. It depends on weather they are holding A/c, Alt or another accessory.
Some years had thicker washers on the bolts to make up the length difference.
I ran a tap (bottoming) into each hole and was amazed at how much crud came out. Just used the tap to clean out the holes, not cut the thread.
Some years had thicker washers on the bolts to make up the length difference.
I ran a tap (bottoming) into each hole and was amazed at how much crud came out. Just used the tap to clean out the holes, not cut the thread.
Thread Starter
Le Mans Master
Joined: Feb 2011
Posts: 5,783
Likes: 400
From: Paoli, IN
St. Jude Donor '17, '19
The manifold bolts are different lengths - just as info incase you didn't know. It depends on weather they are holding A/c, Alt or another accessory.
Some years had thicker washers on the bolts to make up the length difference.
I ran a tap (bottoming) into each hole and was amazed at how much crud came out. Just used the tap to clean out the holes, not cut the thread.
Some years had thicker washers on the bolts to make up the length difference.
I ran a tap (bottoming) into each hole and was amazed at how much crud came out. Just used the tap to clean out the holes, not cut the thread.
Thread Starter
Le Mans Master
Joined: Feb 2011
Posts: 5,783
Likes: 400
From: Paoli, IN
St. Jude Donor '17, '19
Here are two pictures of what I am referencing. They might now help as it was tight in there and my cell phone is big. But you can see the gap in the bolt and the manifold in the green box. One photo is a wider shot than the other.
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Le Mans Master
Joined: Mar 2004
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From: Little Rock AR
That location is supposed to have a stud-bolt. The exhaust manifolds were installed, torqued tight, and sent out with engine. Accessories were added later at assembly plant. I seem to remember that fastener is a stud bolt with provision for the accessory bracket installed later. Bolt in that hole is in the wrong position. Maybe you used it in a different location? See picture in next post.
Last edited by stingr69; Dec 5, 2017 at 09:15 AM.
Thread Starter
Le Mans Master
Joined: Feb 2011
Posts: 5,783
Likes: 400
From: Paoli, IN
St. Jude Donor '17, '19
Can you show me a picture of the bolt I need? I will know if I put the bolts in the wrong order or if someone before me put it in wrong before I got it.
Last edited by ~Stingray; Dec 5, 2017 at 10:14 AM.
Race Director
Joined: Oct 2008
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From: Long Island
If the car is an L82 w/ac there is a compressor rear brace. The earlier cars had the A/C bracket plate bolted to the exhaust.
I would just get thicker hardened washers and go 1/16 to 1/8 thicker on the washers than the space and call it even. I use NEVER SEIZE on the bolts as I may want to remove them in the future.
Order a few catalogues - Ricks Corvette, Paragon, Zip etc - they have diagrams to help order parts and they also help identify parts.
Each year is different after 76 or so. I haven't worked on a 80 in a long time. The Chevy manual talks about French locks ? . I don't ever remember seeing any.. but most cars are not virgins...
I would just get thicker hardened washers and go 1/16 to 1/8 thicker on the washers than the space and call it even. I use NEVER SEIZE on the bolts as I may want to remove them in the future.
Order a few catalogues - Ricks Corvette, Paragon, Zip etc - they have diagrams to help order parts and they also help identify parts.
Each year is different after 76 or so. I haven't worked on a 80 in a long time. The Chevy manual talks about French locks ? . I don't ever remember seeing any.. but most cars are not virgins...
Last edited by BLUE1972; Dec 5, 2017 at 01:14 PM.
Thread Starter
Le Mans Master
Joined: Feb 2011
Posts: 5,783
Likes: 400
From: Paoli, IN
St. Jude Donor '17, '19
Ya, I am pretty sure that is not the bold that came out. All 4 bolts were just that, bolts. None of them had threads on both ends. I guess the spacer was missing prior. Is it really that big of a deal to get it?
Le Mans Master
Joined: Mar 2004
Posts: 7,510
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From: Little Rock AR
Thread Starter
Le Mans Master
Joined: Feb 2011
Posts: 5,783
Likes: 400
From: Paoli, IN
St. Jude Donor '17, '19
Thread Starter
Le Mans Master
Joined: Feb 2011
Posts: 5,783
Likes: 400
From: Paoli, IN
St. Jude Donor '17, '19
The more I think on this, the more I think we are talking about different bolts. If this were in the position I was thinking, there would be no way to unscrew it to take the manifold out. I will need to look again.
Melting Slicks
Joined: Feb 2005
Posts: 2,146
Likes: 115
Hi
It is possible that the bolt in that location was a bolt with a stud sticking out of the top of it. No spacer involved. You just put the bolt in and torque it down and then a nut, washer and lock washer attached to the stud sticking out the top of the bolt.
This might be the situation. Good luck, Terry
This might be the situation. Good luck, Terry
Hey Guys,
I installed gaskets for my exhaust manifold with a buddy of mine. No issues really, but when we put it all together we noticed we had a small gap between the front bolt of the manifold. That bolt holds up the alternator and then goes through the manifold and secures to the engine. However, there is a small gap, like a nut (or spacer) is missing. Does anyone know what is supposed to be here? I don't know if it was there before we changed it out or not but we don't remember hearing anything drop and we couldn't find anything under the car.
Thanks.
I installed gaskets for my exhaust manifold with a buddy of mine. No issues really, but when we put it all together we noticed we had a small gap between the front bolt of the manifold. That bolt holds up the alternator and then goes through the manifold and secures to the engine. However, there is a small gap, like a nut (or spacer) is missing. Does anyone know what is supposed to be here? I don't know if it was there before we changed it out or not but we don't remember hearing anything drop and we couldn't find anything under the car.
Thanks.