dunc
Active Member
- Joined
- Aug 1, 2016
- Messages
- 255
- Location
- Crawford, CO
- Aircraft
- AR-1C 915is, RAF/SH/SC
- Total Flight Time
- 5000
eddie;n1135829 said:Yes it barely shows its just slightly higher than the belt and has a slight taper to the upper inside edge,which you cant see. it
looks like a end cover for the upper pulley
eddie;n1135911 said:Actually the belt stays on track by virtue of the 2 end pieces on the upper and lower pully,the bottom
one is on the inside and the upper on the outside,the belt can't move in either direction,also there is
no rubbing of the belt as the end pieces are moving with the belt and pully.And as for using the
upper motor mount tubes for adjusting the track on the RAF I have never heard of that before,and
I don't think that would even work the plate that the upper pully is mounted to would have to flex and that's
not possible to do with the upper engine mount tubes as the whole engine is mounted on rubber.And if
you could get it to flex it probably would crack from the stress. I buy my belt from Amazon.
There is one other thing about the RAF drive unit that should be mentioned,the cross bolt that holds the
drive unit in place should only be hand tight just snug it down don't put a lot of pressure on it as the plate
could crack,the three bolts on the collar will hold the drive from slipping its belt adjustment.
eddie;n1135958 said:That's right the belt and the end plates are turning at the same speed,I have never thought about track adjustment,I use goodyear belts however the name has been
changed to contitech hawk as continental tires bought the goodyear line of rubber products buts its still the same quality,My belt is 3 3/8" wide(85 mm),
and I paid $120 for the belt,I have never changed my bearings and have about 800hrs on them,I changed the belt at 400 hrs.My Subaru engine is producing
230 HP and I swing a 5 bladed 68" prop pitched to 14 degrees and so far the PSRU has been good.
You may be taking an increasing chance (with your crank pulley in particular), from what I've gleaned on the forum.I have never changed my bearings and have about 800hrs on them