Installed the new 12 V alternator on the 235 then replaced the Dayco #15455 fan belt that came on the motor when I acquired it. The width is narrow and fits well, but it’s a bit too long and there’s no more room on the bracket to adjust out the alternator. I went to the Dayco website and plugged in the data for my 1954 235 to find the correct belt and the result was a #15415. The details show that it’s 4” smaller, which I’m sure will be too small. Can anyone give me the part # of a belt that would corrrectly fit my setup? I’m not particular about a brand. Thanks
Chuck 1950 Chevy 1/2 ton (all original) 1951 Chevy 1/2 ton (future streetrod) 1941 Chevy coupe 1938 Chevy coupe streetrod
You didn't indicate how much "too long" the #15455 belt is.
In peeking at the same source site your pictures refer to, these 3 belts all have the same Top width (.44) and Angle (36). Other available lengths are as noted next to these part numbers:
#15425 - 42.5 in effective length
#15435 - 43.5 in effective length
#15445 - 44.5 in effective length
The effective length listed for #15455 is "45.5" inches (you said too long) and #15415 is shown as "41.5" inches (you think too short).
In between those extremes is #15435 at "43.5" inches - maybe just right???
Let everyone know what you get and test results please. Pics always appreciated!
Good luck!
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
The 15455 belt you took off is 45.5" long (the last 3 digits in 15455). And the 15415 is 41.5" long, 4" shorter than the 15455. Get one in between, like a 15435 or 15440.
Unless the working diameter of your alternator pulley is the same as your generator pulley, getting a belt for your '54 is a bit of a guessing game.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
From the Chevrolet Master Parts List: 1953-55 com. (exc. hvy. duty gen.) belt width 3/8", length 41-3/8", notched, part number 3713313.
Crossing this to a replacement belt commonly sold today the length would be 41-1/2". You converted from gen. to alt. If alt. pulley dia. and width is the same as gen., use the stock length. If you installed a modified/conversion belt tensioner, that requires +/- belt distance, then determine what that difference is and recalculate the overall belt length accordingly. Allow for a small amount of belt stretch.
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."
Thanks everyone for the comments. Dan and Bill, I think the #15435 looks like it just might be the ideal length. You both picked that #, and I agree. I’ll try to find one at a FLAPS. this week to install over the weekend. Buoymaker I haven’t changed a pulley or added a belt tensioner, so all should be stock from what I can tell. I’ll let everyone know how it turns out after I find and install the 43.5” belt. Many thanks!
Last edited by Spotbiltxo; 10/10/20226:18 PM. Reason: Spell correction
Chuck 1950 Chevy 1/2 ton (all original) 1951 Chevy 1/2 ton (future streetrod) 1941 Chevy coupe 1938 Chevy coupe streetrod
