Author Topic: Install CB750 Motor alone without lifting anything  (Read 2957 times)

0 Members and 1 Guest are viewing this topic.

Offline dgilling

  • Hot Shot
  • ***
  • Posts: 343
Install CB750 Motor alone without lifting anything
« on: March 16, 2015, 12:23:05 PM »
I mainly work alone late at night so I knew early on that I would need to come up with a clever way to get the motor in.  I looked all over the web and found this stand http://www.dotheton.com/forum/index.php?topic=31317.0

The design looked fairly simple, my dad is a good welder and he had some left over materials around.  I decided to give it a shot.  I didn't have the motor or the frame with me when we made the stand and i purely went off of the website.

Required tools for Engine Mount:
Borrowed Engine hoist
Engine base stand
Engine freestand

The reason I didn't have to lift anything is because of the engine hoist, but now after doing the engine mount I think you could do everything without the engine hoist except for needing something to hold the frame.  Since it was my first time to ever mount a motor I wanted to make sure I was covered in all areas. 

Me and hondaman put the base on the motor at his house.  It wasn't too bad, and once the bolts were snugged up it worked as a good base stand.  Having the two independent legs is ideal for install and removal of the base stand. 



When i first slid the freestand up to the motor I thought I severely miscalculated my bolt hole alignments.  After going back and looking at my reference, I realized that my example made the base stand much taller.  Exactly three 2x4's taller.  I used the engine hoist to raise up the motor and get the blocks under the stand.  This put the bolt holes almost spot on. 

These holes below should line up.



The engine now at the correct height.  Make sure that the 2x4's do not stick out and interfere with the freestand base legs. 



Once I had the engine raised I slid the freestand up to the motor to where the front right bracket hole lined up with my freestand bolt hole.



I installed a regular bolt that I had laying around.  The holes were almost lined up exactly so getting the bolt in was really easy. 



He're the bolt from a different angle.



Next I took a regular short ratchet strap and wrapped it around the alternator cover and the main beam on the stand and tightened it till it was snug.  All the weight was still on the blocks at this point so I put the engine hoist on a D-ring attached to the base to pull up on the motor and remove the blocks.  I probably didn't need to do this but I wanted a safety backup anyways. 



I used U-bolts on the back.  I went with these just in case i needed to do small adjustments.  These worked out pretty good in the long run too as they were very easy to remove and didn't interfere. 



I released the engine hoist and the stand held very sturdy.  After two clicks on the ratchet strap the engine was level. 





Next i removed the base stand.  Again, really east to do with the independent legs. 



I used the engine hoist to hold the frame that way I didn't have to hold it up with my own strength.  It worked good because the hydraulic has a lot of granularity for adjustments and wheels to roll the frame forward.



I just changed the bar tape on my road bike so I had the old stuff.  This is perfect for protecting the frame.  It has a sticky back and wraps on super thin with good padding.



Installed in 3....2.....1









It went so fast that I really didn't get that many pictures.  The actual act of trying to put the frame on the motor took me about 8 minutes.  The bolts were really easy to put in.  I followed Hondamans advice. 

front bottom bolt first
back bottom bolt second
rear top bolt

don't tighten anything till all bolts and brackets are on. 

After I put in the bottom frame bolts I could remove my engine stand.  I placed some blocks under the frame and sat the engine on the table.  I'll post some more pictures of the final steps later.  My table has caster and i wanted the engine high while I still work on things.  When I get the wheels ready I'll install the fork and swing arm and set this sucker on the ground. 

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,301
Re: Install CB750 Motor alone without lifting anything
« Reply #1 on: March 16, 2015, 12:26:49 PM »
Outstanding!  8)
'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 mineā€¦"

Offline dgilling

  • Hot Shot
  • ***
  • Posts: 343
Re: Install CB750 Motor alone without lifting anything
« Reply #2 on: March 16, 2015, 01:27:14 PM »

Offline AintNoEasyWay

  • Hot Shot
  • ***
  • Posts: 706
Re: Install CB750 Motor alone without lifting anything
« Reply #3 on: March 16, 2015, 01:29:04 PM »
ahh... that engine looks so sick!

Offline JamesH

  • Enthusiast
  • **
  • Posts: 249
Re: Install CB750 Motor alone without lifting anything
« Reply #4 on: March 16, 2015, 01:59:33 PM »
Awesome thanks for sharing...

Offline markb

  • When I finish my current project I might be a
  • Master
  • *****
  • Posts: 1,615
Re: Install CB750 Motor alone without lifting anything
« Reply #5 on: March 16, 2015, 02:13:12 PM »
Another great example of working smarter instead of harder.  Some may think it seems like a lot of work but once you have the tools made that's when you save time and your back and you don't ding up those nice finishes.  ;)
1969 CB750 sandcast #97 restored - Sold Restoration thread link
1969 CB750 sandcaxt #576 - Sold
1969 CB750 sandcast #1553 - Sold
1969 CB750 sandcast #1990 - Sold
1969 CB750 sandcast #5383 restored - Sold Restoration thread link
1970 CB750 K0 restored - Sold
2010 H-D Tri Glide Ultra Classic (Huh?)

Offline ekpent

  • Really Old Timer ...
  • *******
  • Posts: 13,512
  • To many bikes-but lookin' for more
Re: Install CB750 Motor alone without lifting anything
« Reply #6 on: March 16, 2015, 06:13:35 PM »
Just yanked an engine yesterday for a quickie cam deal at a VJMC meet/ workshop on a members bike. Less than an hour the engine was on the operating table the old fashioned way, two guys and a pair of gloves. When all the wheels and hardware etc is viable you have to do it the old fashion way---   Grunt----   :D   For you guys with an already put together bike don't over think it, just pull it like they probably did in the shops back in the day. !
« Last Edit: March 16, 2015, 06:21:10 PM by ekpent »