Threaded studs on TJ oil pan screws
 

About half of the oil pan screws on my TJ are plain cap screws, and half
have a threaded stud projecting. None of the studs do anything that I can
see.

What are these studs for?

Re: Threaded studs on TJ oil pan screws
 

Alignment would be my guess. It is a pain to get a pan and gasket
started square so studs sound better than tying the gasket in place with
thread.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Richard J Kinch wrote:
>
> About half of the oil pan screws on my TJ are plain cap screws, and half
> have a threaded stud projecting. None of the studs do anything that I can
> see.
>
> What are these studs for?

Re: Threaded studs on TJ oil pan screws
 

Alignment would be my guess. It is a pain to get a pan and gasket
started square so studs sound better than tying the gasket in place with
thread.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Richard J Kinch wrote:
>
> About half of the oil pan screws on my TJ are plain cap screws, and half
> have a threaded stud projecting. None of the studs do anything that I can
> see.
>
> What are these studs for?

Re: Threaded studs on TJ oil pan screws
 

Alignment would be my guess. It is a pain to get a pan and gasket
started square so studs sound better than tying the gasket in place with
thread.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Richard J Kinch wrote:
>
> About half of the oil pan screws on my TJ are plain cap screws, and half
> have a threaded stud projecting. None of the studs do anything that I can
> see.
>
> What are these studs for?

Re: Threaded studs on TJ oil pan screws
 

Mike Romain writes:

> Alignment would be my guess.

This has nothing to do with gasket alignment. The studs are outside the
pan, on the screw heads.

Re: Threaded studs on TJ oil pan screws
 

Mike Romain writes:

> Alignment would be my guess.

This has nothing to do with gasket alignment. The studs are outside the
pan, on the screw heads.

Re: Threaded studs on TJ oil pan screws
 

Mike Romain writes:

> Alignment would be my guess.

This has nothing to do with gasket alignment. The studs are outside the
pan, on the screw heads.

Re: Threaded studs on TJ oil pan screws
 

Richard J Kinch wrote:
>
> Mike Romain writes:
>
> > Alignment would be my guess.
>
> This has nothing to do with gasket alignment. The studs are outside the
> pan, on the screw heads.

Then I would guess that the last person that took the engine apart lost
the pan bolts and just made do with what he found lying around on the
floor or bench.
This usually means those 'studs' have to go back into the 'same' holes
unless he got really lucky and the threads were the same. Most times I
see that, the threads have been chewed out to only fit the replacement
bolt. This is bad for oil leaks and future gasket replacements usually
too.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: Threaded studs on TJ oil pan screws
 

Richard J Kinch wrote:
>
> Mike Romain writes:
>
> > Alignment would be my guess.
>
> This has nothing to do with gasket alignment. The studs are outside the
> pan, on the screw heads.

Then I would guess that the last person that took the engine apart lost
the pan bolts and just made do with what he found lying around on the
floor or bench.
This usually means those 'studs' have to go back into the 'same' holes
unless he got really lucky and the threads were the same. Most times I
see that, the threads have been chewed out to only fit the replacement
bolt. This is bad for oil leaks and future gasket replacements usually
too.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: Threaded studs on TJ oil pan screws
 

Richard J Kinch wrote:
>
> Mike Romain writes:
>
> > Alignment would be my guess.
>
> This has nothing to do with gasket alignment. The studs are outside the
> pan, on the screw heads.

Then I would guess that the last person that took the engine apart lost
the pan bolts and just made do with what he found lying around on the
floor or bench.
This usually means those 'studs' have to go back into the 'same' holes
unless he got really lucky and the threads were the same. Most times I
see that, the threads have been chewed out to only fit the replacement
bolt. This is bad for oil leaks and future gasket replacements usually
too.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: Threaded studs on TJ oil pan screws
 

Mike Romain writes:

> Then I would guess that the last person that took the engine apart lost
> the pan bolts and just made do with what he found lying around on the
> floor or bench.

I expect these are original.

Re: Threaded studs on TJ oil pan screws
 

Mike Romain writes:

> Then I would guess that the last person that took the engine apart lost
> the pan bolts and just made do with what he found lying around on the
> floor or bench.

I expect these are original.

Re: Threaded studs on TJ oil pan screws
 

Mike Romain writes:

> Then I would guess that the last person that took the engine apart lost
> the pan bolts and just made do with what he found lying around on the
> floor or bench.

I expect these are original.

Re: Threaded studs on TJ oil pan screws
 

Richard J Kinch wrote:
>
> Mike Romain writes:
>
> > Then I would guess that the last person that took the engine apart lost
> > the pan bolts and just made do with what he found lying around on the
> > floor or bench.
>
> I expect these are original.

Ouch....

Was it the end of a production year or something where they ran out of
the proper bolts? I got 'lucky' that way on my CJ7. They ran out of
stock AMC rear ends so they put a Dana 44 in...

The only time I normally see the studs on top of the nut like that is
when a bracket or wire needs to be bolted on after the part is assembled
or as I mentioned, someone screwed up and lost parts.

Is there any pattern to them or are they just random? Maybe they are to
position the engine in an assembly jig or something? Are they pointy
ends, slot ends, hex ends or just flat?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: Threaded studs on TJ oil pan screws
 

Richard J Kinch wrote:
>
> Mike Romain writes:
>
> > Then I would guess that the last person that took the engine apart lost
> > the pan bolts and just made do with what he found lying around on the
> > floor or bench.
>
> I expect these are original.

Ouch....

Was it the end of a production year or something where they ran out of
the proper bolts? I got 'lucky' that way on my CJ7. They ran out of
stock AMC rear ends so they put a Dana 44 in...

The only time I normally see the studs on top of the nut like that is
when a bracket or wire needs to be bolted on after the part is assembled
or as I mentioned, someone screwed up and lost parts.

Is there any pattern to them or are they just random? Maybe they are to
position the engine in an assembly jig or something? Are they pointy
ends, slot ends, hex ends or just flat?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: Threaded studs on TJ oil pan screws
 

Richard J Kinch wrote:
>
> Mike Romain writes:
>
> > Then I would guess that the last person that took the engine apart lost
> > the pan bolts and just made do with what he found lying around on the
> > floor or bench.
>
> I expect these are original.

Ouch....

Was it the end of a production year or something where they ran out of
the proper bolts? I got 'lucky' that way on my CJ7. They ran out of
stock AMC rear ends so they put a Dana 44 in...

The only time I normally see the studs on top of the nut like that is
when a bracket or wire needs to be bolted on after the part is assembled
or as I mentioned, someone screwed up and lost parts.

Is there any pattern to them or are they just random? Maybe they are to
position the engine in an assembly jig or something? Are they pointy
ends, slot ends, hex ends or just flat?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: Threaded studs on TJ oil pan screws
 

various fasteners go on them for auto trans lines and o2 sensor wires

Richard J Kinch wrote:

> About half of the oil pan screws on my TJ are plain cap screws, and half
> have a threaded stud projecting. None of the studs do anything that I can
> see.
>
> What are these studs for?

Re: Threaded studs on TJ oil pan screws
 

various fasteners go on them for auto trans lines and o2 sensor wires

Richard J Kinch wrote:

> About half of the oil pan screws on my TJ are plain cap screws, and half
> have a threaded stud projecting. None of the studs do anything that I can
> see.
>
> What are these studs for?

Re: Threaded studs on TJ oil pan screws
 

various fasteners go on them for auto trans lines and o2 sensor wires

Richard J Kinch wrote:

> About half of the oil pan screws on my TJ are plain cap screws, and half
> have a threaded stud projecting. None of the studs do anything that I can
> see.
>
> What are these studs for?

Re: Threaded studs on TJ oil pan screws
 

philthy wrote:
> various fasteners go on them for auto trans lines and o2 sensor wires

Woo hoo.. a correct answer. :)

http://www.revbeergoggles.com/temp/side-i6.jpg
At the bottom you see the O2 sensor connector.
That's pushed on one of those studs that hang down from
the oil pan. Rather than make many different setups
for each production vehicle they simply put studs where
they would be needed no matter what vehicle the engine
will be installed in.


> Richard J Kinch wrote:
>
>> About half of the oil pan screws on my TJ are plain cap screws, and
>> half have a threaded stud projecting. None of the studs do anything
>> that I can see.
>>
>> What are these studs for?

Re: Threaded studs on TJ oil pan screws
 

philthy wrote:
> various fasteners go on them for auto trans lines and o2 sensor wires

Woo hoo.. a correct answer. :)

http://www.revbeergoggles.com/temp/side-i6.jpg
At the bottom you see the O2 sensor connector.
That's pushed on one of those studs that hang down from
the oil pan. Rather than make many different setups
for each production vehicle they simply put studs where
they would be needed no matter what vehicle the engine
will be installed in.


> Richard J Kinch wrote:
>
>> About half of the oil pan screws on my TJ are plain cap screws, and
>> half have a threaded stud projecting. None of the studs do anything
>> that I can see.
>>
>> What are these studs for?

Re: Threaded studs on TJ oil pan screws
 

philthy wrote:
> various fasteners go on them for auto trans lines and o2 sensor wires

Woo hoo.. a correct answer. :)

http://www.revbeergoggles.com/temp/side-i6.jpg
At the bottom you see the O2 sensor connector.
That's pushed on one of those studs that hang down from
the oil pan. Rather than make many different setups
for each production vehicle they simply put studs where
they would be needed no matter what vehicle the engine
will be installed in.


> Richard J Kinch wrote:
>
>> About half of the oil pan screws on my TJ are plain cap screws, and
>> half have a threaded stud projecting. None of the studs do anything
>> that I can see.
>>
>> What are these studs for?

Re: Threaded studs on TJ oil pan screws
 

DougW writes:

> Rather than make many different setups
> for each production vehicle they simply put studs where
> they would be needed no matter what vehicle the engine
> will be installed in.

OK, I'll buy that.

Consequently it doesn't matter if they go back in the same pattern.

Re: Threaded studs on TJ oil pan screws
 

DougW writes:

> Rather than make many different setups
> for each production vehicle they simply put studs where
> they would be needed no matter what vehicle the engine
> will be installed in.

OK, I'll buy that.

Consequently it doesn't matter if they go back in the same pattern.

Re: Threaded studs on TJ oil pan screws
 

DougW writes:

> Rather than make many different setups
> for each production vehicle they simply put studs where
> they would be needed no matter what vehicle the engine
> will be installed in.

OK, I'll buy that.

Consequently it doesn't matter if they go back in the same pattern.

Re: Threaded studs on TJ oil pan screws
 

"Richard J Kinch" <kinch@truetex.com> wrote in message
news:Xns98A1DDBA9A8Esomeconundrum@216.196.97.131.. .
> DougW writes:
>
> > Rather than make many different setups
> > for each production vehicle they simply put studs where
> > they would be needed no matter what vehicle the engine
> > will be installed in.
>
> OK, I'll buy that.
>
> Consequently it doesn't matter if they go back in the same
> pattern.

No but what does matter is that they get the proper torque.

Earle

Re: Threaded studs on TJ oil pan screws
 

"Richard J Kinch" <kinch@truetex.com> wrote in message
news:Xns98A1DDBA9A8Esomeconundrum@216.196.97.131.. .
> DougW writes:
>
> > Rather than make many different setups
> > for each production vehicle they simply put studs where
> > they would be needed no matter what vehicle the engine
> > will be installed in.
>
> OK, I'll buy that.
>
> Consequently it doesn't matter if they go back in the same
> pattern.

No but what does matter is that they get the proper torque.

Earle

Re: Threaded studs on TJ oil pan screws
 

"Richard J Kinch" <kinch@truetex.com> wrote in message
news:Xns98A1DDBA9A8Esomeconundrum@216.196.97.131.. .
> DougW writes:
>
> > Rather than make many different setups
> > for each production vehicle they simply put studs where
> > they would be needed no matter what vehicle the engine
> > will be installed in.
>
> OK, I'll buy that.
>
> Consequently it doesn't matter if they go back in the same
> pattern.

No but what does matter is that they get the proper torque.

Earle

Re: Threaded studs on TJ oil pan screws
 

Earle Horton wrote:
> "Richard J Kinch" wrote...
>> DougW writes:
>>
>>> Rather than make many different setups
>>> for each production vehicle they simply put studs where
>>> they would be needed no matter what vehicle the engine
>>> will be installed in.
>>
>> OK, I'll buy that.
>>
>> Consequently it doesn't matter if they go back in the same
>> pattern.

As long as they support what ever you need hanging off
them. I'd dry-fit everything first just to make sure.

> No but what does matter is that they get the proper torque.

And step the torque so the gasket and flange don't get squooshed
out.

--
DougW

Re: Threaded studs on TJ oil pan screws
 

Earle Horton wrote:
> "Richard J Kinch" wrote...
>> DougW writes:
>>
>>> Rather than make many different setups
>>> for each production vehicle they simply put studs where
>>> they would be needed no matter what vehicle the engine
>>> will be installed in.
>>
>> OK, I'll buy that.
>>
>> Consequently it doesn't matter if they go back in the same
>> pattern.

As long as they support what ever you need hanging off
them. I'd dry-fit everything first just to make sure.

> No but what does matter is that they get the proper torque.

And step the torque so the gasket and flange don't get squooshed
out.

--
DougW

Re: Threaded studs on TJ oil pan screws
 

Earle Horton wrote:
> "Richard J Kinch" wrote...
>> DougW writes:
>>
>>> Rather than make many different setups
>>> for each production vehicle they simply put studs where
>>> they would be needed no matter what vehicle the engine
>>> will be installed in.
>>
>> OK, I'll buy that.
>>
>> Consequently it doesn't matter if they go back in the same
>> pattern.

As long as they support what ever you need hanging off
them. I'd dry-fit everything first just to make sure.

> No but what does matter is that they get the proper torque.

And step the torque so the gasket and flange don't get squooshed
out.

--
DougW