Topic: Idea for engine installation

[Keith]

Forgive the poor sketch; my idea for a one-person engine installation jack. Fabricate a stand with casters, weld or bolt a Harbor Freight trailer jack to it ($30), then fabricate bracket that lines up with engine mounting lugs. Jack will allow up/down and rotation of engine. I think it will work. Thoughts?

[pickleknuckles]

Looks like it'd work real well. Could even use an electric trailer jack or one w/a 3/4" or 19mm nut for an impact driver so you don't have to worry about clearance for the crank handle.

Sent from my Pixel 8 Pro using Tapatalk

[MauiK3]

What would it fasten to on the side of the CB750 SOHC motor?

[Keith]

Two motor mounting lugs on the engine block.

[M 750K6]

Ingenious. I seem to remember, when my 750 went in, there was also a bit of tilting required, it didn't just go in on the same vertical plane as the frame. Difficult to be sure that was the case, as it was all a bit frantic!

Not that it defeats the invention, if that is the case, leave some wiggle room to be able to tilt the frame towards / away from the engine, perhaps creating any tilt with some thin wood offcuts slid under one side of the bottom frame rail.

Be interested to hear how it goes. If it works, I'd buy one!

Martin

[HondaMan]

I might suggest something I also always do:
1. Remove the oil pan and oil pump.
2. Make a steel (mine is 0.2" thick) plate in the shape of (mostly) the oil pan opening, use at least 4 screws to hold it onto the engine in place of the pan This buys you 3/4" more space for installation.
3. Flatten off the top of the flange on the right-lower-front engine bolster in the frame (with a file). This is the source of the "fiddling" that happens when trying to install the engine. This buys you another 1/4" of space, making it a full 2" of installation room.
4. Then try for that straight-shot install.

[Dunk]

Indeed tilting at angles is required with oil pan installed and frame mount top edge not ground down. Just did it yesterday. I did remove the valve cover breather vent cap, gives a smidge more wiggle room. I'll be grinding down the lip on the frame mount before it goes back in.

[kerryb]

I like this idea, but can’t figure out a bracket that wouldn’t be in the way when trying to position the engine for bolts.  I use the ‘c-hook’ method that I learned about on here.  It allows control of the tilt too.

[HondaMan]

I like this idea, but can’t figure out a bracket that wouldn’t be in the way when trying to position the engine for bolts.  I use the ‘c-hook’ method that I learned about on here.  It allows control of the tilt too.

+1 on this approach: someone here made wooden C-hooks for us for a while: I have one!