« previous next »
Pages: [1]   Go Down

Author Topic: Re-use Conrod bolts  (Read 1240 times)

0 Members and 2 Guests are viewing this topic.

Offline HondaYo

  • Full Member
  • *
  • Posts: 33
Re-use Conrod bolts
« on: September 21, 2017, 12:07:14 PM »
Need to take my crankshaft apart in order to swich transmission chain.
 I´ve read that using old bolts for the big ends is Never an option. Allways get new ones because of the fact that they "stretch to hold"
 
Any opinions and/ or bad experiences about this.
Locktite?! I have to blame my own stupidity that I didn´t put a new chain in when I rebuilt the motor this spring.

Allready know the final answer, but I´m curious if anyone has tried :)

Cheers
Logged

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,289
Re: Re-use Conrod bolts
« Reply #1 on: September 21, 2017, 12:10:37 PM »
Quote from: HondaYo on September 21, 2017, 12:07:14 PM
Need to take my crankshaft apart in order to swich transmission chain.
Whats preventing you from just sliding the chain over it?  :-\
« Last Edit: September 21, 2017, 12:32:13 PM by flybox1 »
Logged
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline HondaYo

  • Full Member
  • *
  • Posts: 33
Re: Re-use Conrod bolts
« Reply #2 on: September 21, 2017, 12:30:08 PM »
The connecting-rods. I have the bottom half of the engine off. Sliding the camshaft out so I can remove the crank with the camchain and leave the head and cylinders with the pistons assembled. Working on the tranny so there´s no reason to take apart the top in my opinion.
Logged

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,289
Re: Re-use Conrod bolts
« Reply #3 on: September 21, 2017, 12:33:16 PM »
I see.
I reused the bolts on my build, and just double checked my torque.
Logged
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline strynboen

  • Old Timer
  • ******
  • Posts: 4,884
    • http://forums.sohc4.net/index.php?PHPSESSID=0hcclqejm9omp62j50rp7gsaf0&/topic,60973.0.html
Re: Re-use Conrod bolts
« Reply #4 on: September 22, 2017, 03:35:28 AM »
i just bay a new thain...its easy to pull the valve cover..and brake the chain..and put a new closed thain inn..then you have no vorryes of any link go bad..
have the crank aut gives a easy thange of these parts..and nev sealings/simmerings om the crank ends..they have dots..so no vay to thange them later..they are locked in the cases
Logged
i kan not speak english/but trying!!
http://forums.sohc4.net/index.php?topic=60973.0
http://forums.sohc4.net/index.php?topic=144758.0
i hate all this v-w.... vords

Offline magnum56

  • Enthusiast
  • **
  • Posts: 186
Re: Re-use Conrod bolts
« Reply #5 on: September 22, 2017, 11:17:12 AM »

I also reused my connecting rod bolts.

I don't subscribe to the thought that Honda made the rod bolts so weak,  that they should be unusable once torqued to specification. 
Logged
'74 CB750K

Offline HondaYo

  • Full Member
  • *
  • Posts: 33
Re: Re-use Conrod bolts
« Reply #6 on: September 22, 2017, 12:38:23 PM »
I agree! As I remember they are torqued to about 35-40 Nm (got notes somewhere) and that should not stress the life out of any bolt used only once..... But then again.
 I´ll give it a go and if my motor turns inside out, I´ll post a nice album for everyone to enjoy :)
Cheers 
Logged

Offline 754

  • Really Old Timer ...
  • *******
  • Posts: 29,050
Re: Re-use Conrod bolts
« Reply #7 on: September 22, 2017, 12:58:44 PM »
 After what my 836 went thru with stock rods, I would not even  worry about it on a stock motor.
« Last Edit: September 22, 2017, 04:30:16 PM by 754 »
Logged
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline Nic

  • Enthusiast
  • **
  • Posts: 140
Re: Re-use Conrod bolts
« Reply #8 on: September 22, 2017, 03:25:33 PM »
Quote from: strynboen on September 22, 2017, 03:35:28 AM
i just bay a new thain...its easy to pull the valve cover..and brake the chain..and put a new closed thain inn..then you have no vorryes of any link go bad..
have the crank aut gives a easy thange of these parts..and nev sealings/simmerings om the crank ends..they have dots..so no vay to thange them later..they are locked in the cases
He's wanting to change the primaries not the cam chain.
I've re used plenty of rod bolts with never a problem. If it's a big yee haa engine then prolly would but then you'd be using better rods as well.
Logged

Offline HondaYo

  • Full Member
  • *
  • Posts: 33
Re: Re-use Conrod bolts
« Reply #9 on: September 22, 2017, 06:40:50 PM »
Thank You Gentlemen. Feeling quite confident reusing the old bolts now.
 
 Got the crankshaft out letting loose the camchain from the camshaft and disconnecting the conrods with O-rings holding on to the bolts not allowing them to fall into the upsidedown pistons which are siting untouched in the barrels with the top on.
It´s allmost to easy. I could do this every Friday :)
 
 Letting loose the Firestorm tomorrow if the wheather gets any less rainy.

Enjoy Your weekend!  8)
 
Logged
Pages: [1]   Go Up
« previous next »