The International Cessna^® 170 Association

What is the difference between an 0-300, 0-300A, 0-300B, 0-300C, 0-300D?

Are Service Manuals available for the 0-300 series engines? Where?

Olan

The Overhaul Manual is available from Univair and Aircraft Spruce 877/477-7823.
The O300A is the standard engine (derived from C145-2) with improved cam/lifter materials and minor case changes. The O300B has provisions for a hydraulic prop. (Uses a remote gov.) The O300C is identical to an O300A except for a 6-bolt prop flange on the crank. The O300D is identical to a C except for provisions for an angle-drive (so-called "key start") starter motor and a vacuum pump.

Hi I just read about the B modle being equiped to operate an adjustable prop. Was this ever done? were they serviceable? Just seems like an answere lots of us are looking for ? Gene

Hi, Gene!
Sorry to have missed your inquiry way back in 2005 re: adjustable props in a B model. Don't know how I missed it.
As far as I know, (...and, I could be wrong...), no B models were ever equipped with the adjustable prop, other than a "ground adjustable" two-position McCauley. While it sounds interesting (Hey!, I'd like to try it myself!)... it apparently was not a huge success and has never been seen by the average 170 enthusiast.
Again, sorry for the long-delay in responding. - George

gahorn wrote:Hi, Gene!
Sorry to have missed your inquiry way back in 2005 re: adjustable props in a B model. Don't know how I missed it.
As far as I know, (...and, I could be wrong...), no B models were ever equipped with the adjustable prop, other than a "ground adjustable" two-position McCauley. While it sounds interesting (Hey!, I'd like to try it myself!)... it apparently was not a huge success and has never been seen by the average 170 enthusiast.
Again, sorry for the long-delay in responding. - George

A 170 with the McCauley 2 position prop showed up at the 2005 Petit Jean flyin and was photgraphed by our own Herr Fenstermacher. For those of you lucky enough to buy a 2006 170 Calendar (shameless plug... ) the photo can be seen on the April page.

Yes George if you had been to Petit jean in 05 you would have seen one of these. It is adjustable IN THE AIR not just ground adjustable.

The owner, Dave Bengtson, didn't realize what a rare prop he had. I seem to recall that Ron Massicot mentioned he had had one at one time as well.

Here is my photo.

While I am pleased to see that installation again, (I forgot that pic had been posted previously), I believe the C7 prop was not a factory design, but an "aftermarket" mod by McCauley. (Perhaps Gene didn't mean a factory original and that perception was only in my head. I don't believe the B-model was ever marketed by Cessna with that prop.)
I also believe the C7 (and the C20) were both subject to an expensive AD that required their ferrules and blade threads be truncated. The only place in the world that still does this work, last I heard, was in Germany and the cost is prohibitive, considering the prop blades have been out of production for some time now. The Cessna 175-C used that prop if it had the GO-300-E engine installed and the last two blades in existence as late as '96 were in Seattle and carried price tags of $8,000 each.
(My friend decided to sell his 175-C immediately and bought a different airplane.)

roger wrote:Hi I just read about the B modle being equiped to operate an adjustable prop. Was this ever done? were they serviceable? Just seems like an answere lots of us are looking for ? Gene

gahorn wrote:Hi, Gene!
Sorry to have missed your inquiry way back in 2005 re: adjustable props in a B model. Don't know how I missed it.
As far as I know, (...and, I could be wrong...), no B models were ever equipped with the adjustable prop, other than a "ground adjustable" two-position McCauley. While it sounds interesting (Hey!, I'd like to try it myself!)... it apparently was not a huge success and has never been seen by the average 170 enthusiast.
Again, sorry for the long-delay in responding. - George

Could Gene have been referring to the B-model ENGINE, as in the O-300B? After all, the thread is about engines. The O-300B engine can be equipped with a 2-position cockpit-controllable hydraulic propeller, as in the above photo.

Miles

Bruce, no Ron did not have that prop. I had the Koppers(originally called)then Aero-matic that was counterweight self adjusting if you had it set up right. The one at Petit Jean was the first time many of the old timers (if you want to callus that) had ever seen the adjustable prop-- still would be interesting to try. The aero-matic from another thread is now as per George is only usable on the B engine, which he and I had a long discussion about since as my paper work reguired on the dampened chrank. I could not believe that after it was approved on all this guy would only approve it for the B However it's his paperwork and approval. Ron

cessna170bdriver wrote: Could Gene have been referring to the B-model ENGINE, as in the O-300B? After all, the thread is about engines. The O-300B engine can be equipped with a 2-position cockpit-controllable hydraulic propeller, as in the above photo.

Miles

The B engine wasn't approved for the airplane according to my copy of the type certificate, and the prop approval specifies the C145-2H engine.