Okay, so I've started working on my Bolens HT23 Repower... planning to put a Ruggerini RD200 2 cylinder air-cooled diesel in it.
This is the same size block as the Ruggerini RD180 used in the Ariens GT18, though the Ariens runs the drive shaft off the fan side of the engine (like a Cub Cadet 102, etc.). It is very similar to the Lombardini air-cooled diesels uses in the AC 920 and the Simplicity 7790. The engine gets about 18-21 hp depending on the application.
I posted a short video and some information about the engine in January 2015... you can find the link here:
The biggest challenge I face right now is to get an adapter to fit the short 1:5 tapered shaft on the PTO side of the Ruggerini. The shaft is only about 1 1/4 inches long, and tapers to within 1/8 inch of the face of the crankcase. There is a threaded hole of approx. 12mm in the shaft that can be used to hold the adapter on.
I found a person on eBay that makes tapered adapters so people can use genset engines on other items. His price was WAY reasonable, and as soon as I can define how to hook up the drive shaft to the adapter, I'll have him do the work for me.
Drive shafts with U-joints need to have a little room to slide in and out as the shaft turns, especially if one shaft is offset from the other.. Bolens does this by fixing the engine side of the shaft with a key way and set screws, and only uses a keyway on the pump input shaft so it can move. I don't care for this design as it causes wear on the pump shaft, which is way expensive to replace or repair.
I have a chain coupler that will fit the Ruggerini, although it would probably have enough flex to it, it probably isn't a good idea to use it with a drive shaft with U-joints.
What I'm thinking of doing now is to have an adapter made with a center pilot hole and a 4 hole bolt circle and put a stub shaft on to it. I've even ordered a Kohler stub shaft... it is 1" diameter with a 1/4 inch key way.
Assuming I can get it to clear the hydro pedal cross shaft, I would run the engine side of the drive shaft loose so it can slide on the shaft (I'll have to put a bushing on the shaft to adapt the 1" stub shaft to the 1 1/*' U joint. I'll put a zerk fitting in the yoke to keep it lubed. The pump side of the shaft will be fixed so it can't slide.
The disadvantages I see with this is that this will make the already short 19" drive line about 4 inches shorter...I'm concerned that this may be a problem, since the engine output and the pump input are not inline with each other... there's about a 1 1/2" difference with the engine shaft being higher than the pump...
I'm not familiar with setting up a driveline, etc. does anyone see any problems with this setup? Input appreciated.
I've attached a drawing of the PTO side of the engine that gives the shaft dimensions...
Edited by Utah Smitty, June 02, 2016 - 12:35 AM.