I posted earlier about my disintegrated fan and over sized radiator. Len said I needed a new vibration damper. I've got one on the way from the OEM - Vibratech. I guess I'm stuck with the radiator, as I can't locate an original replacement. What I now need is a new fan. I can't find a mfg. ID anywhere on the broken hub mounted fan I have. Does anyone know where I can get an OEM style or an improved aftermarket? This goes on a 4104 with a 671.
Thanks,
Gordie
Go to Horton web site and click on fans they will ask the questions like number of blades and size and match it you may have to notch the blades on one side for a GM Contact Larry Hall or someone with the Western GMC Bus Nuts I bet those guys can find you a radator
good luck
I think you have an 04, it had a rubber isolator on the fan drive, My limited experience has been that any fan mounted directly to crankshaft will not hold up because of the vibrations generated by the diesel combustion process. If you use a crank mounted fan you need an isolator.
I had a local metal fab shop build my radiator tanks and side supports from 1/8 steel for my 04, then I ordered a custom built core to fit those tanks. If your radiator is mostly too tall I think a commercial radiator shop should be able to shorten your core, if not you could have a new core built the size you need.
Ken
Are the tanks on your radiator too large too? If the tanks are the right size a good radiator shop should be able to install a new core. I found a local radiator shop that specializes in commercial and heavy duty radiators that replaced the core on my radiator. They happened to have the right core that had been on the shelf for a long time.
I have a friend with a DDEC 6-71 in a 4104 he did away with the GM fan drive he made a fan drive using shafts ,pulleys, pillar block bearings and belts for the fan drive he got tried of worrying with the GM drive falling to pieces
luvrbus,
I had considered two other solutions other than going back to direct crank drive. Electric fan by Electric Fan Engineering, but I'd need 10" between engine and radiator. The motor is 2.5 hp and draws 70 amps! The other was a design like your friends. With that I could get more tha 2100 rpm and not worry about the balance on the crank. I drew one up, but would like to see your friends if he has any picks. And also pulley ratios.
Thanks,
Gordie
Quote from: belfert on July 22, 2012, 07:21:35 AM
Are the tanks on your radiator too large too? If the tanks are the right size a good radiator shop should be able to install a new core. I found a local radiator shop that specializes in commercial and heavy duty radiators that replaced the core on my radiator. They happened to have the right core that had been on the shelf for a long time.
I have no idea how it compares to the OEM radiator. I haven't been able to find original dimensions. I have an original Parts Book which has an exploded view of the radiator which is bolted flange construction. The radiator I have measures 30"W, 37"H, 4.5" thick. The top tank is 6" tall. The bottom is 4" tall. I think I could take of 1" from the bottom tank and 2" from the top. Plus I may be able to raise the radiator another inch. If I go this route, my only remaining issue the fan.
I took the fan assembly apart and found the mfg. name and part # on the INSIDE. Somebody should talk to their marketing dept! The company is Multi-Wing America. I emailed them and I think I can get replacement blades. So now the question is - will a new harmonic balancer likely prevent further fan disintegration? And, should I stick with this "close to OEM" setup? What's your vote luvrbus?
Gordie
Hi Gordie,
Rick West (gg04) installed a DDEC 6-71 TA in his '04 and had trouble keeping it cool with the stock radiator. He purchased a fan from Flex-A-Lite that was designed to be a "pusher", drilled out the rivets to reverse the blades and machined the center hub opening to the size of the original '04 fan.
He says it keeps his turbo'd 6-71 cool and he has been using this for some time now. I purchased the same fan (have the part number at home) from Flex-A-Lite recently for just over $200.00 but have not yet modified per his recommendation - or installed. Because I am having a bit of trouble keeping my 6-71 NA cool on long uphill pulls in summer months, I am looking forward to this upgrade and hope it solves my problems.
I will PM you the part number and also see if I can find Rick's original post wherein he describes his modification and installation of the fan.
Kevin
Me I would install the shaft,belts and bearing and spin the fan faster and use a good Horton 12to 16 blade fan with a 2 speed clutch
A 4104 always get hot unless you drop a gear and spin the fan faster on a climb the long hard pulls are a killer for the GM setup
good luck