Author Topic: Broke an engine stud flush with the case...  (Read 4081 times)

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Offline Medyo Bastos

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Broke an engine stud flush with the case...
« on: June 23, 2020, 11:15:06 AM »
...gotdammit


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Offline Medyo Bastos

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Re: Broke an engine stud flush with the case...
« Reply #1 on: June 23, 2020, 12:13:13 PM »
Got it




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Offline Stev-o

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Re: Broke an engine stud flush with the case...
« Reply #2 on: June 23, 2020, 02:39:11 PM »
Did you use the welder that was under the bed?!
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline dragracer

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Re: Broke an engine stud flush with the case...
« Reply #3 on: June 23, 2020, 02:49:06 PM »
Did you use the welder that was under the bed?!

Good one Steve o

Offline MRieck

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Re: Broke an engine stud flush with the case...
« Reply #4 on: June 23, 2020, 04:31:36 PM »
Did you use the welder that was under the bed?!
Come on.....we all know welders are kept in the bedroom closet.
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Offline Medyo Bastos

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Re: Broke an engine stud flush with the case...
« Reply #5 on: June 23, 2020, 09:02:10 PM »
i did grab it from under my bed!


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Offline PeWe

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Re: Broke an engine stud flush with the case...
« Reply #6 on: June 25, 2020, 03:40:08 AM »
I recently removed the cylinder studs from a 1975 750 case I have.
Same thing as my K6 years ago. It is much easier to get them to move by tightening with a quick, short twist by both hands. "Click", and remove them.

I used 2 std M8 nuts locking each other, held by 2  12mm spanners with constant torque together. Both hands needed.

Remove direct did not work, had tighten to the "click".
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Alan F.

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Re: Broke an engine stud flush with the case...
« Reply #7 on: June 25, 2020, 09:36:52 AM »
I recently removed the cylinder studs from a 1975 750 case I have.
Same thing as my K6 years ago. It is much easier to get them to move by tightening with a quick, short twist by both hands. "Click", and remove them.

I used 2 std M8 nuts locking each other, held by 2  12mm spanners with constant torque together. Both hands needed.

Remove direct did not work, had tighten to the "click".

I removed all but two on my K8 this way, these came out easily with two pair of vise-grip locking pliers as low on the studs as possible.

Offline johno

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Re: Broke an engine stud flush with the case...
« Reply #8 on: June 26, 2020, 04:20:00 AM »
If you get a tight one their a pain, I always give them an overnight soak with a squirt of thread lubricant, then give them a good tap on the top while it is still wet to jar the threads and help the penetrant to soak in, same again the next day then lots of tapping on top and sides of stud to jar the threads again then use a heat gun or flame to warm the alloy then bam do the two spanner trick discussed last thread, if feels tight still and not right then I get someone to tap the top of stud while I do the big turn. Be guided by the feel of the stud.....if it feels like it will break then it will so leave, soak again and lots of tapping the stud etc
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Offline Alan F.

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Re: Broke an engine stud flush with the case...
« Reply #9 on: June 26, 2020, 08:29:11 AM »
I was noticing how much my two stuck studs were twisting with the double nut and 2 wrenches method.

Next time I'll have to find a silver sharpie to draw a vertical line on the stud and make a video showing just how much the stud twists without breaking loose or snapping.

I thought I was seeing 20 to 30 degrees of twist. I really didn't want to fuss with a broken stud though so I moved on to other methods.
« Last Edit: June 26, 2020, 08:32:36 AM by Alan F. »

Offline PeWe

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Re: Broke an engine stud flush with the case...
« Reply #10 on: June 26, 2020, 12:02:23 PM »
The old Honda stock studs are really flexible.
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline MRieck

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Re: Broke an engine stud flush with the case...
« Reply #11 on: June 26, 2020, 05:41:21 PM »
The old Honda stock studs are really flexible.
Is that a euphemism for soft?
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Offline Medyo Bastos

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Re: Broke an engine stud flush with the case...
« Reply #12 on: June 26, 2020, 07:03:44 PM »
Yeah, i double nutted, and righty tightied before i leftie loosied...


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Offline PeWe

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Re: Broke an engine stud flush with the case...
« Reply #13 on: June 26, 2020, 10:25:38 PM »
The old Honda stock studs are really flexible.
Is that a euphemism for soft?
Not really, it return to its orientation like a spring. Only soft, stay twisted.
The stock studs can withstand rather much abuse.
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Stev-o

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Re: Broke an engine stud flush with the case...
« Reply #14 on: July 09, 2020, 04:15:58 PM »
Yeah, i double nutted, and righty tightied before i leftie loosied...


Thats how it broke?
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Medyo Bastos

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Re: Broke an engine stud flush with the case...
« Reply #15 on: July 09, 2020, 05:17:59 PM »
Yes, it is. It was still tough to take out, even with the heat involved.


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Offline johno

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Re: Broke an engine stud flush with the case...
« Reply #16 on: July 09, 2020, 07:16:21 PM »
Hell Medyo, when I seen you on this thread again I thought bugger, not another one  ;D glad its not 8)
GRASSHOPPER SOHC HONDAS ARE THE MEANING OF LIFE.

Offline Medyo Bastos

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Re: Broke an engine stud flush with the case...
« Reply #17 on: July 09, 2020, 07:23:02 PM »
Hell Medyo, when I seen you on this thread again I thought bugger, not another one  ;D glad its not 8)
No, not another, lol


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Offline PeWe

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Re: Broke an engine stud flush with the case...
« Reply #18 on: July 10, 2020, 02:56:35 AM »
A new nick name Studman or just The Stud! :D
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Stev-o

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Re: Broke an engine stud flush with the case...
« Reply #19 on: July 10, 2020, 06:16:31 AM »
A new nick name Studman or just The Stud!

"The Stud Breaker"!!
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Online Don R

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Re: Broke an engine stud flush with the case...
« Reply #20 on: July 21, 2020, 09:50:05 AM »
 That sounds painful.
No matter how many times you paint over a shadow, it's still there.
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Offline Tracksnblades1

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Re: Broke an engine stud flush with the case...
« Reply #21 on: July 21, 2020, 10:28:13 AM »
Yeah, i double nutted, and righty tightied before i leftie loosied...


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I always preferred double nutting a righty tighty over a lefty loosey....
Both both are good just a little different 😎
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Online Don R

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Re: Broke an engine stud flush with the case...
« Reply #22 on: July 26, 2020, 10:20:06 AM »
 By the way, thanks for posting the fix. Often, we never see of hear what the result was.
No matter how many times you paint over a shadow, it's still there.
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Offline Medyo Bastos

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Broke an engine stud flush with the case...
« Reply #23 on: July 26, 2020, 10:46:36 AM »
Don it took a good amount of effort even with the heat involved from building the weld to the top of the nut. I’ve never had one that tough before. It is a good thing the cases are aluminum

I honestly don’t waste my time with easy outs anymore. They break more often than not. I’ve used this way several times with great results.


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« Last Edit: July 26, 2020, 10:49:13 AM by Medyo Bastos »

Offline valt

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Re: Broke an engine stud flush with the case...
« Reply #24 on: August 01, 2020, 08:06:19 PM »
Honestly if I am having trouble with the studs and they are just going to be junk. I just heat them and bend them, then just use the stud itself to break it loose. Like a giant allen wrench!