| Author | Message | ||
| frank-id Unregistered guest Posted From: 67.136.154.90 Rating: N/A |
I'm working on making my Crown fan more effective. The current fan is a huge 5 blade fan that must pull air down an air tunnel. The radiator is side mounted and to maximise the air flow has some challenges. The fan is mounted to a shaft that incorporates the pulley that is driven by the crankshaft pulley. I'm converting to a nylon fan with 8 blades and is much lighter than the factory 5 blade fan. The fan mechanics have not been checked for many years. With some time and patience, the shaft was finally seperated from the other componets. The castelated nut and shaft threads did not fit and turn smoothly. The nut and shaft are extra fine thread pitch. I have no exotic taps for extra fine thread. What to do. After some thot, I used an old machinists trick. I found my container of four leaf clover fine valve lapping compound. The threads were coated with the compound and threaded the full length of the treads about 10 times. The nut threads the shaft smoothly and effortlessly. All the lapping compound was washed from all the parts. A little 30 weight oil and all is good. This is not a big deal, but a good challenge. The new roller bearings will be found tomorrow. Frank | ||
| R.C.Bishop (Chuckllb)
Registered Member Username: Chuckllb Post Number: 7 Registered: 7-2006 Posted From: 4.240.141.2 Rating: N/A |
Interesting, Frank...I've looked at mine for some time now, but decided..."if it ain't broke, don't fix it"...  Have you taken your radiator out or did you do this from the engine access? RCB '64 Crown Supercoach (HWC) | ||
| Gary Stadler (Boogiethecat)
Registered Member Username: Boogiethecat Post Number: 1205 Registered: 4-2002 Posted From: 72.192.189.52 Rating: N/A |
I've been there and done that as you may recall... I stuck in a giant 8 blade high pitched fan from Flex-a-lite that was originally a 24" that I had to cut down to 22" to make fit. I manufactured a new mount while putting in a fan clutch- that eliminated the need to mess with the old Crown bearings, and I put in a recored radiator that is a full 2 inches thicker than the factory one. All of this was needed to finally overcome "driving by the temerature gauge" in hot weather and high altitudes. Taking the radiator out is no big deal, other than the sheetmetal it's hung on two big bolts and that's it... and putting in a thicker-cored one was easy since the tanks are already wide enough to accomodate the thicker core. Dang, now one of my injectors went bad, so I gotta take the Jakes I just installed off again. Ugh. | ||
| frank-id Unregistered guest Posted From: 67.136.141.76 Rating: N/A |
Earlier I had changed my radiator. I discovered by trial that the DD Crown buses used a longer and higher core than the Cummins buses./ The factory fan assembly is very heavy. The fan assembly is the pathway for good engine performance and longivity. The 8 bladed fan makes lots of small bites of air instead of huge amounts. I do not have a method of measuring the volume of air moved by each size/design fan. The original bearings were just a little rough but still turning. PM the famous preventive maintainence. Takes a licking but keeps on ticking. Frank | ||
| Gary Stadler (Boogiethecat)
Registered Member Username: Boogiethecat Post Number: 1206 Registered: 4-2002 Posted From: 72.192.189.52 Rating: N/A |
Frank- A guy on ebay has lots of parts for your fan Item number: 170031791820 |