4106 fan clutch drive control

[richard5933]

Did the fire equipment still run 2-strokes when you were there? Maybe there's someone else from the dept. that can lend you a hand running the rack.

[Friday1]

In 2002 I helped write specs for 6 Peterbilt based pumpers with Cummins power. That was the end of Detroit diesel except for Series 60's in some of the million dollar ladder trucks. Two stroke Detroits did us well. We had some late 1940's pumpers and ladder trucks with 6/71's and an old FWD that were repowered from Waukashaw or Continental gas engines. You know, vehicles with real fenders! All the old pumpers were custom built Peter Pirsch, Seagraves, Sutphen, or American LaFrance so they had gas power rear axle ratios. After the diesel engines were installed, one would spin the dual rear tires but top out at 35 mph. So they put a real tall gear in the next one and it would go 75 mph. That was when there were 11 firemen doing the repairs. That group only had 3 men who were really mechanics and the other 8 were sent there as punishment and that meant they were on an 8 hour day. Line firemen worked 24 on 48 off and one tour of duty off each month. So when real mechanics came over to repair the terrible fleet it was a struggle-"We never replace any drums  or discs, that cost too much. Just put a set of pads and shoes on and get it back out there." It took us 3 mechanics about 3 years to have the fleet standing tall and the admin cried the whole time  that maintenance cost was never this high. Yeah, everything was held together with tape and bailing wire. Now they lease pumpers from a couple of outfits. Nobody working there now is a Detroit guy. I could do the easy half of the rack if I had someone coaching me. I doubt if I could do the inside half due to 2 back surgeries has made me not very bendy anymore.

[RJ]

Friday -

I found and scanned a GM Service Bulletin about the Torus drive for the engine cooling fan. I've attached it to this post for you, hopefully it will answer some questions.

On another topic, PD4106-326, if you don't know already, was delivered new in March of 1961 as fleet number S-654 to Safeway Trails, HQ'd in Washington, DC.  Safeway was, and I think still is, a Trailways affiliate carrier.

FWIW & HTH. . . 

[Friday1]

Thanks so much for the PDF. Great info to have. I removed numbers 38-53 the pinion and everything that made up the drive for the AC system. I made an aluminum plug and installed it in place of that. My cooling system is working great. I had to have the radiator recored and all new hoses when I got home from picking it up in Phoenix. The PO was very honest and told me the radiator was bad...... after I got there to inspect the bus. I gulped hard and got in the driver seat and said a little prayer for the radiator and took off.[/img]  When I blocked off my Toros drive oil to make the fan run all the time, the fuel mileage dropped. The plastic fan has 9 blades vs 8 blades on the OEM fan. It moves a lot of air.