| Author | Message | ||
| Patrick levenson (Zubzub)
Registered Member Username: Zubzub Post Number: 275 Registered: 5-2007 Posted From: 70.51.33.234  Rating: N/A |
Posted this on the other board but some don't frequent it....so. Hi I bought a nice Aux pulley drive: [IMG]http://i392.photobucket.com/albums/pp3/zubzub_photos/Alt%20conversion%204104/IMG_2522.jpg[/img] [IMG]http://i392.photobucket.com/albums/pp3/zubzub_photos/Alt%20conversion%204104/IMG_2523.jpg[/img] for the back of my 6-71 so that I could get rid of the huge useless generator back there: No pic of pre removal...but if you have one you know what it looks like. The new P drive came with its own internal gear that is supposed to bolt to the cam gear: [IMG]http://i392.photobucket.com/albums/pp3/zubzub_photos/Alt%20conversion%204104/IMG_2524.jpg[/img] The old Gen was driven by this internal gear, here it is in the engine: [IMG]http://i392.photobucket.com/albums/pp3/zubzub_photos/Alt%20conversion%204104/IMG_2519.jpg[/img] Here it is out: [IMG]http://i392.photobucket.com/albums/pp3/zubzub_photos/Alt%20conversion%204104/IMG_2526.jpg[/img] With the spacer: [IMG]http://i392.photobucket.com/albums/pp3/zubzub_photos/Alt%20conversion%204104/IMG_2525.jpg[/img] This is what the cam gear looks like without an internal gear drive bolted to it: [IMG]http://i392.photobucket.com/albums/pp3/zubzub_photos/Alt%20conversion%204104/IMG_2527.jpg[/img] The old gear drive won't fit the new P drive and the bolt holes on the Cam gear are larger than the bolt holes on the new gear drive. The P drive housing bolts up OK and the spacing from driven gear to the cam gear face is OK: [IMG]http://i392.photobucket.com/albums/pp3/zubzub_photos/Alt%20conversion%204104/IMG_2532.jpg[/img] but I will need to bore out the holes on this: [IMG]http://i392.photobucket.com/albums/pp3/zubzub_photos/Alt%20conversion%204104/IMG_2524.jpg[/img] by 1/16 (old bolts 27/64, new drive gear 23/64. This gear will not be pushing much....tops a 160 amp so I wouldn't mind some reassurance that it will have no trouble even though the wall of the gear will be 1/32 thinner. Now that I write it down sounds minor.... Buddy who sold it to me said it would bolt right up, but my bus guy says it is from a 6V71, personally I have no idea but I think I can get it to work. Can't return it as it was a liquidation sale.... My next concern is the size of the pulley....diameter is 5 5/16", (bottom of the belt V)....is this going to drive the usual truck alts fast enough?....IE is there a particular speed I should look to drive my new Alt at and will the aux drive pulley size allow that? I know I should be able to change the Alt pulley, but presumably if I go too small I might get slippage. As alway info links etc appreciated. | ||
| Dal Farnworth (Dallas)
Registered Member Username: Dallas Post Number: 502 Registered: 7-2004 Posted From: 98.20.55.33  Rating: N/A |
"This gear will not be pushing much....tops a 160 amp so I wouldn't mind some reassurance that it will have no trouble even though the wall of the gear will be 1/32 thinner. Now that I write it down sounds minor.... " Zub, The old dual field generator is actually 140-160 amps on each field. The carbon core regulator is set up so that it only draws from one field until the original AC blowers kick in. This gives you a total of 280-320A as needed. I reset mine so that the dual fields are always on and have had little or no problem. However: Like you, I am going to move into the 6th decade of the 20th century and replace the gear drive generator with a single 135 amp Leece-Neville alternator. Replacing the internal gear drive with a pulley, except I'll use the other end of the 6-71 and run from the cam gear there. | ||
| Patrick levenson (Zubzub)
Registered Member Username: Zubzub Post Number: 276 Registered: 5-2007 Posted From: 70.51.33.234 Rating: N/A |
My bus didn't even come with the original V reg so I gave up before I started....probably would have learned me up something if I had worked it out but for now I'll just try an Alt. Not as easy as I thought, the DD seem very interchangeable but there are small differences here there and everywhere. | ||
| Dal Farnworth (Dallas)
Registered Member Username: Dallas Post Number: 503 Registered: 7-2004 Posted From: 98.20.55.33 Rating: N/A |
Yeah, I found the same thing when I was doing some other stuff on the 6-71 back when I was about 15. Now, I'm a tad bit older, and I'm finding more and more that doesn't work the same as it use too. | ||
| Dave Walker (Chrome_dome)
Registered Member Username: Chrome_dome Post Number: 264 Registered: 3-2010 Posted From: 75.210.11.200  Rating: N/A |
Zub, can you use a smaller dia. bolt and use some small metal bushings to fit the larger holes? Instead of boring out the other holes. Chromie | ||
| marvin pack (Gomer)
Registered Member Username: Gomer Post Number: 1351 Registered: 3-2007 Posted From: 71.55.178.71  Rating: N/A |
I have found the same as Dallas and Chromie now I use copper tubing to make the space up aroung the bolts. sometimes I have to split it and then make the sucker fit that way. Gomer | ||
| Patrick levenson (Zubzub)
Registered Member Username: Zubzub Post Number: 277 Registered: 5-2007 Posted From: 70.51.33.234 Rating: N/A |
It is the cam gear that has the larger hole, I don't want to helicoil it or whatever as a failure there would really suck.....I guess the start shaped driven gear could crack at the thin wall but for me it is the simpler solution. | ||
| Dal Farnworth (Dallas)
Registered Member Username: Dallas Post Number: 504 Registered: 7-2004 Posted From: 98.20.55.33 Rating: N/A |
Zub, Living in Quebec, you should have a bunch of truck wrecking yards near you, if not recycling yards. Spend a few days seeing what there is to offer... On the other hand, I found an interior cut gear in my junk that is obviously from the Detroits, (Can't fool Me Lol LOl Lol), I'm just not sure which Detroit it;s from... Send me some dimensions via email... in my profile. | ||
| Patrick levenson (Zubzub)
Registered Member Username: Zubzub Post Number: 278 Registered: 5-2007 Posted From: 70.51.33.234 Rating: N/A |
Hey thanks for the offer Dallas, but I have my solution. John Vickers contacted me with the info that he just drilled out the holes in his star shaped drive (like mine) and it worked fine, and has held together for years so I guess I'll keep it simple. I'm just glad the weather is nice and I have a little spare time to work on my bus this week. | ||
| Brian Evans (Bevans6)
Registered Member Username: Bevans6 Post Number: 29 Registered: 5-2009 Posted From: 65.92.50.157 Rating: N/A |
The drive plate is hardened steel, and is the same piece as used for the compressor drive on my 8V71, it is hardened for wear resistance on the teeth more than anything. drilling it will be fine. The original bolts holding it on where special self-locking bolts, so when you put it back on use high quality bolts, clean them and the holes exceptionally well and use red loctite. If possible torque them with a torque wrench. Not ones you want coming loose... Brian |