Removing prop driver VW 1834

Gary T · Post by **Gary T** » Fri Sep 24, 2010 7:01 pm

Hi all,
first post, new member - treat me gently!

I need to remove the prop driver from a SAUER VW 1834 engine fitted to a Tipsy Nipper. Can anyone point me in the right direction, i.e. is the big nut a R/H or L/H thread and is there an easy way of locking the crank to prevent rotation?

Thanks in advance

PS, despite repeated e-mails to SAUER, I've never had a reply, nor do I have a manual! Can anyone help?

Noel Howard · Post by **Noel Howard** » Thu Oct 07, 2010 3:52 pm

Hello Gary,
I usually wait to see if anyone else answers messages, but as on one has I will give you my twopence worth.

I presume you are refering to the propeller flange or hub. If this is fitted to the dynamo pulley drive end of the engine, then the bolt is a conventional right hand thread. (I seem to remember it is an M14 bolt) It will have some locking arrangement, or threadlock to prevent it from unscrewing in flight. It will, in any case be very tight. You can bolt a piece of angle iron, or similar to the flange to stop it turning. The end of the crankshaft should be an interference fit in the hub. That is the shaft will be about 0.0015 inches greater in diameter than the hole in the hub. This means that you will need a suitable puller to remove the hub. Unless you are suitably equipped you will need the services of a workshop that has a puller to carry this out.
Unless you really need to detach the hub, I would suggest you leave it well alone.
Noel.

Rob Swain · Post by **Rob Swain** » Fri Oct 08, 2010 11:34 am

With my albeit limited experience of aviation (not Sauer) VW 1834s I have to agree with Noel - leave the prop hub alone if at all possible.

The Acro hub on the conversion I rebuilt had to be removed using a hydraulic press once the crankshaft had been removed from the engine.

The fixing bolt was nothing special as I recall - just rather large. I acquired a new long one to draw the hub back on after I'd changed the main crankshaft bearings. That came from a fairly normal fasteners and engineering supplies place.

Gary T · Post by **Gary T** » Sat Oct 16, 2010 6:52 pm

Thanks for the reply fellas - much appreciated. Have been cleaning the hub with Micromesh metal and it's coming up well. When it's all done I'll show my inspector and see if he's happy that there's no pitting and therefore no requirement to remove.