vanguard 16hp in my 680?

[dan]

Well I have this 680 and this 16hp motor laying around so I decided to put them together. I took some measurements from the wasted 14hp kohler and the 16hp twin fits in nice. My questions are what electric PTO and drive adapter ( the part that attaches to the fly wheel ) to use? The shaft is 1" , can someone suggest a model or part # I could use to find these on Ebay or the like? I'd like to buy used if possible.
Thanks for your help!

If any one has any thoughts or ideas on this mod please pass them along!

Dan

Well the 580 came with a Briggs so see if the clutch drive plate will fit the Vanguard from a 16hp opposed Briggs. You can make an adaptor plate from the clutch drive plate to a hydro drive shaft.

On the pto???? you may have to find a 1" pto for a Vanguard, just check pulley size for a match, 4" X 5/8" ???? I think???

Or any one with a 1" id bearing and then adapt it to the bolt pattern on the mounting plate to the Vanguard.

Scott

Here is an adaptor plate (1/2" steel plate) I made for my 982, Onan to a CV drive shaft, using simple hand tools.

Anything can be done.

Scott

[dan]

Thanks for the reply! I found some pics of a 580, it looks like my 680,could I use parts from the 580 and make this a bolt in swap?? Are the frames the same? could it be as easy as finding a used drive shaft and related parts and PTO from a 580 and dropping this 16hp twin into my 680?? Boy that would be nice!!

Dan

[Matt G.]

The 1641 was a bit later tractor that had a 16 hp vanguard in it. You could probably use the PTO clutch from that if the crank output shaft is the same.

The driveshaft from a 580 will not work because the 580 is not a hydro. The front rag joint just bolts directly to the flywheel through a couple of steel spacers. It looks like the vanguard engine has the same interface, or at least the version in the 1641 does.

Matt and Dan,

I'm posting in defense of myself-

I never look at things for what they are but for what they could be, just he way my mind works.

The part on the left is a Briggs drive plate with the pins removed. Card board in the center is a pattern for a 1/4" steel plate adaptor. Part on the right is a Kohler coupler adaptor that your 682 is already using, you have the part.

The drive shaft you now have will likely need to be shortened or modified one way or the other, that's a given regarless of what adaptor you use.

This plate would take me about 1 1/2 hours to make including cutting down the shaft and drilling a new pin hole. This set up will cost me nothing as I already have the parts.

I would cut the plate round, drill out the 1 1/8" hole in the center and then drill the three holes to bolt the adaptor to the drive plate. I would then drill and tap the four 1/4-20 holes for the rag/coupler adaptor that is already on the 682 (part to right).

I know I don't answer all questions this clearly, time does not permit, however I'm only showing that with simple tools you can adapt and make things work and work well.



Scott

Also let me note that I have no idea if the Vanguard and the Briggs use the same drive plate/cup/adaptor, this you'll have to determine.

Scott

[Matt G.]

Scott-

There is no need to do what you've posted. The horizontally-opposed B&S in the 580 has the front rag joint bolted more or less directly to the flywheel...there's two 3/8" tapped holes that are the same distance apart as the holes in the rubber disc. See below parts 4 and 5:

I can't say for sure if every B&S Vanguard has the same bolt pattern, but the parts diagrams for the 1641 make it seem plausible. That interface seems to be fairly common among Briggs engines.

Assuming all of this works, he'll need one 722-3001 rubber flex disc and two 711-3001, as well as the spherical ball bushing 741-3004, and none of the stuff you're showing.

[dan]

Matt, Scott

First let me thank you for helping me in this project, the 680 came in pieces and did not have the drive shaft or related parts so this part of the mod is up for grabs. While I was searching I came across a link that someone had put a universal joint on the trans side (cubfaq.com) cool idea!

Scott, that adapter looks great! I will look around my garage what I can come up with, What do you think about putting two of the briggs drive plates together (like a flying saucer) then bolting the kohler coupler to that? I don't know if I have the tools to make that adapter (with out hurting myself) and keeping it centered. This is fun, I like the challenge! How is that CV joint made? Could I use something like that with the drive shaft and fab the trans side?

Thanks again guys!
Dan

[dan]

Matt, there must be another part that connects to the flywheel that I cant find? The nut on the crank would be in the way, I see though how this would all work!