Help ASAP

[Mike69cuda]

Carriage Bolt is not grade 5, the minimum
strength automotive bolt for any application under

Carraige bolts are Hardware Grade, Grade 2 or softer and Grade 5 is the minimum strength Automotive fastener for ' High Stress' applications. You can tell the difference by using a fine file & cutting a small slot with Corner of File. Grade 8 is usually the hardest(some Aircraft & Specialty are harder)
I would bet the stud you cut out of new mount was Grade 8, so you've effectively made that mount weaker, and under tension that Carriage Bolt WILL stretch and eventually fail, so you had better run a Torque Strap or you'll get a big surprise.
All you saw years ago was a piece of chain, every Hot Car had them then.
Also saw that Rod End in a post & that style rod end notoriously weak, look at top of it in pic, not much metal above sphere of joint. Seen those break & might be engineered to break for certain reasons. The Clevis style on the bottom is bullet proof. I'd bet he used that cheap rod end to help alignment. Better to use Clevis & space it properly.
Or Old School Era Correct

Do you have any evidence that the stud in the motor mount is grade 5? It is not a bolt, it is a metal stud welded to a flat piece of metal. Is the plate grade 5 also?

I would generally agree with you on grade 5. However you do not seem to have any evidence to back up your specific assertions.

The failure mechanism I have observed is the rubber isolator delaminating from the metal plate. The chain does not solve the problem of the mount failing, it just keeps the engine from moving a lot when the mount fails. The engine can still change position with a broken mount.

 

[Woody500]

Do you have any evidence that the stud in the motor mount is grade 5? It is not a bolt, it is a metal stud welded to a flat piece of metal. Is the plate grade 5 also?

I would generally agree with you on grade 5. However you do not seem to have any evidence to back up your specific assertions.

The failure mechanism I have observed is the rubber isolator delaminating from the metal plate. The chain does not solve the problem of the mount failing, it just keeps the engine from moving a lot when the mount fails. The engine can still change position with a broken mount.

I'm not sure you deserve an answer. My proof is out ther find it yourself.

 

[Woody500]

If you ignore Engineering Standards you do so at your own risk and you endanger others as a result. Including those you love!

 

[mygasser]

I'm not sure you deserve an answer. My proof is out ther find it yourself.

why do folks take things the wrong way all the time these days. now i took his post to read that he was curious how you knew the spec of fasteners used in the application, where it appears you read he was calling you a liar. really? please just re-read or at least ask someone what they meant before taking offence. not everyone is having a dig and as i was taught when growing up.... 2+2 does not equal 5
neil.

 

[Woody500]

why do folks take things the wrong way all the time these days. now i took his post to read that he was curious how you knew the spec of fasteners used in the application, where it appears you read he was calling you a liar. really? please just re-read or at least ask someone what they meant before taking offence. not everyone is having a dig and as i was taught when growing up.... 2+2 does not equal 5
neil.

As in conversation it's all about how you say something, whether you insult someone or not.

 

[RustyRatRod]

Carriage Bolt is not grade 5, the minimum
strength automotive bolt for any application under

Carraige bolts are Hardware Grade, Grade 2 or softer and Grade 5 is the minimum strength Automotive fastener for ' High Stress' applications. You can tell the difference by using a fine file & cutting a small slot with Corner of File. Grade 8 is usually the hardest(some Aircraft & Specialty are harder)
I would bet the stud you cut out of new mount was Grade 8, so you've effectively made that mount weaker, and under tension that Carriage Bolt WILL stretch and eventually fail, so you had better run a Torque Strap or you'll get a big surprise.
All you saw years ago was a piece of chain, every Hot Car had them then.
Also saw that Rod End in a post & that style rod end notoriously weak, look at top of it in pic, not much metal above sphere of joint. Seen those break & might be engineered to break for certain reasons. The Clevis style on the bottom is bullet proof. I'd bet he used that cheap rod end to help alignment. Better to use Clevis & space it properly.
Or Old School Era Correct Chain!

Some heavy suspension and frame bolts are grade 10 and 12. I've had some in my hand. Also, some of the heavy duty metric fasteners on vehicles are even harder. The U bolts that hold the lower control arm shafts on 60s and 70s Chevy and GMC trucks for example are grade 10.

 

[RustyRatRod]

As in conversation it's all about how you say something, whether you insult someone or not.

It's not just in conversation. Seems almost everybody below a certain age these days has a chip on their shoulder always lookin to show somebody else how "badass" they are. Shootings at car shows? Birthday parties? Seriously? We never heard of such when I was growing up.

 

[mygasser]

It's not just in conversation. Seems almost everybody below a certain age these days has a chip on their shoulder always lookin to shoe somebody else how "badass" they are. Shootings at car shows? Birthday parties? Seriously? We never heard of such when I was growing up.

agreed, i've lost count of the times i've overheard youngsters say ''what you looking at?'' when out in public
neil.

 

[RustyRatRod]

agreed, i've lost count of the times i've overheard youngsters say ''what you looking at?'' when out in public
neil.

Right. That's the exact attitude I'm talkin about.

 

[mygasser]

i'm sure if us grumpy old farts got together we could put the world to rights, lol.
neil.

 

[Dartswinger70]

"...what are you looking at?" "..oh nothing, I wasn't looking at his neck man..."

 

[Jeff Seighman]

agreed, i've lost count of the times i've overheard youngsters say ''what you looking at?'' when out in public
neil.

A freaking idiot, that's what I'm looking at.

 

[MILO]

Oh in the mirror

 

[Woody500]

It's not just in conversation. Seems almost everybody below a certain age these days has a chip on their shoulder always lookin to show somebody else how "badass" they are. Shootings at car shows? Birthday parties? Seriously? We never heard of such when I was growing up.

85 yr old schoolmate of my dad, when I asked about this subject 20 yrs ago he said he saw a stabbing in the alley behind Shortridge HS in the early 30s, just no guns. Knives or fists. Easier to talk them down maybe. Guns are immediate.

 

[Woody500]

i'm sure if us grumpy old farts got together we could put the world to rights, lol.
neil.

When Alonso missed the Speedway driving for McLaren, I knew a that bunch of retired guys I know, could've done a better job than they did!

 

[Woody500]

Do you have any evidence that the stud in the motor mount is grade 5? It is not a bolt, it is a metal stud welded to a flat piece of metal. Is the plate grade 5 also?

I would generally agree with you on grade 5. However you do not seem to have any evidence to back up your specific assertions.

The failure mechanism I have observed is the rubber isolator delaminating from the metal plate. The chain does not solve the problem of the mount failing, it just keeps the engine from moving a lot when the mount fails. The engine can still change position with a broken mount.

I'd said minimum Grade 5 for auto and you're right, those studs are probably Grade 8, and I said to check for hardness with a file. Do it enough times & you can get a feel for it.
Metal plates probably mild steel, to keep cost down, and can't be hardened so its softer than grade 5 bolt.

 

[Mike69cuda]

Geez, what happened here? I thought I was just sharing a clever idea for fixing motor mounts. I certainly didn’t expect the Spanish Inquisition….

 

[WymanV]

NOBODY expects the-

Oh, bugger.

 

[dd386]

1971 Plymouth Scamp 360 small block the motor mount drivers side has broke again ? Can anybody help me get the correct motor mount or kit it or repair advice. I can't find anyone to fix the mount correctly . Steering wheel is shaking with clunking noise. I would appreciate


Will this kit work for the scamp?