Thread: Adaptor shaft

Vern, well spotted - only realised after posting it - 10 points. How're the kids?

Here are some photos of the Outcast shaft for and aft (for Ancient ) of the transfer case.

Pretty much all the oil seal landing is used. The shaft is no where near knocking the pto cover plate.


IMGP3224.jpg

IMGP3225.jpg

Here my finger points to the approx depth of the clearance machined into the back of the adaptor, to allow for the protrusion of the MSA output shaft. Not much meat left for splines on a floating shaft as a two piece. Yet looking at Ancient's photos he seems to have substantial shaft.

IMGP3226.jpg

IMGP3227.jpg

Leads me to question - did Ancient recess his oil seal further in so his drive flange could protrude more into the t/c to get the extra spline length - or is Ancient's case a different length to the Outcast/Sheldon set up which I thought were much the same length by a couple of mm. Without any measurements for Ancients floating shaft it is hard to determine.

My shaft sits in the input gear about the same distance.
As for the kid, he's much better thanks, stopped pooping blood which is good☺

Just found an early comment on the Isuzu to LT230 thread indicating Grubbs case length at 180mm. Outcast is 173mm.

The difference of 7mm may be the make or break of a floating shaft for the Outcast case, meaning I may not be able to join you in buying one. Will keep reviewing the rest of the thread to see if the size of Sheldons case stayed 180.

Would still be interested if someone could measure the overall length of Sheldons adapter shaft.

Now on page 117 the length is quoted as 175mm.

The thread indicates that some people were going to adapt their MSA to the LRover engine bell housing. Mine is all NPR truck. Were there different lengths of Sheldon adaptor casing depending on whether you were all truck or adapted to LRover bell housing - can't see detail regarding this so far in the thread and may have been a detail sorted in personal emails.

Vern, is yours all NPK truck or LRover bellhousing?

Back to reading...

Originally Posted by workingonit

The inside of the MSA drive flange - involute anyone?

Attachment 89497

Looks involute, 30o pressure angle to me.

square splines are an inferior design. I can't see why Isuzu would use them as they seem to consistently demonstrate good engineering practice.

Finished reading. Nothing more to add in that regard.

I've muddied enough water. Asked enough questions.

Had a thought.

Make a simple full length shaft, fully SAE10. No oil seal landing. In fact the shaft could be over length and cut back by those with different length cases. Maybe slightly waisted to create a failure point where you want it.

Transfer the oil seal landing to the adaptor drive flange.

Drill the adaptor drive flange to take the simple SAE10 shaft. The spline hole can be straight through but plated later to stop oil leaks and stop the shaft bumping the MSA drive shaft.

So attach your adaptor drive flange to the MSA drive flange.

Put on your case.

Insert your simple shaft.

Followed by the input gear if your a 1.22.

Given the drive shaft does not reach the pto cover, and to stop it floating to the pto cover, bung some obstruction into the space that is easily removed later.

You could use a draw bar to secure the shaft but what to do if the bolt breaks with the shaft? Can't get the last bit of bolt out to put in new shaft so back to removing whole transfer case.

Issues. Oil lubrication. Whether the adaptor drive flange at the oil seal area will be thick enough, my calcs showing about 6mm wall thickness.

Sketch with simple shaft as described previously but showing some other thoughts quickly discarded.

IMGP3228.jpg

Originally Posted by workingonit

Sketch with simple shaft as described previously but showing some other thoughts quickly discarded.

IMGP3228.jpg

A simpler option would be for the flange not to be drilled through - leave a dead end and a small oil 'well'. Then you have a free/floating shaft. Attach a block of brass to the pto cover so it can only move a few mm each way. The brass block can be designed to double as an oil feeder and the shaft movement will help lubrication.

Plenty of full floating axles allow the shaft to float like this.