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cayoterun

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Posts posted by cayoterun

  1. Thanks for all this help, and hope ya'll have patience.

    He wants to put a B series on a late model running gear such as a Pete/w cat power, etc, for a working road truck.

    The rear end of the hood, fender extentions on the long noses were what I was wondering if they would match the front of the B61 cab. We could have one complete running 61 and a parts 61 to work with if he used my old B61. Cab mounts and such would have to be made to get it all to sit on a late model frame. It may better to throw sentiment away and just get a B long nose, cab and all.

    To switch subjects to Trannys for my V-12

    #1: How heavy are duplex-triplex trannys? I need to hold weight down on this, because it'll be on a 1 ton frame and suspension. The V-12 weighs almost 1500# alone.

    #2: Isn't a duplex just low and direct in the aux? Triplex is low-direct-high in aux?

    #3: Are the gear ratios the same in the duplex and triplex main box?

    Thanks again

    Cayoterun

  2. Cayoterun.

    There are some people here who know a lot more than I do but I'll give this a shot -

    I think that all of the B model cabs themselves are essentially the same dimensions. The fenders, hoods and radiator shells are different from model to model.

    There are also, however, some differences in some of the cab panels. For instance, a concave, or curved back panel was an option on any of the B cabs. Its' purpose was to allow a longer trailer to be legally hauled. So it is primarily an East Coast option, where the length laws were shorter than west of the Mississippi.

    On some of the heavy duty B81 & 83 cabs I have seen a different floor pan, which I understand may have been an option on any B cab. It provides a drop of about 2" to allow for a taller driver.

    On the B-66 & 67, the engine protudes through the firewall into the cab which reduces the interior room by quite a bit. Add the concave back panel, and the B-67 is not a good choice for anyone but a skinny, small guy. I'm trying to figure out how I will fit in my own!

    So to answer your question, I think you could get a B-61, 73, 75 or any of them other than a B-66 or 67. You might fab up a dropped floor pan like the factory option, and you really should be quite happy with the room.

    Good Luck!

    Paul Van Scott

    I'm learning alot a new tidbits about the B's. It's been over 45yrs since I was around them, and they were all alike with the same company, except the one I used here on the farm.

    My son should be showing up on this site. He carries a wireless computor on the truck with him. He needs to be learning with the "old man", too.

    Thanks to all,

    Cayoterun/Okla

  3. This is probably one of those storys that is only funny if you were there....

    My very first job was at a gas/service station, (remember those)?, and the small oil distributor that filled the tanks had a 66 GMC tanker with the V-12 GMC gas engine. It had a different sound. His bulk plant was about three blocks away as the crow flies, and about seven blocks by street route. In a weeks time, we would get three deliveries of 500 gallons of gasoline, a barrel of straight 30wt. oil, and a bulk load of 10W30, or 10W40 depending on season.

    This GMC tanker did not have a fuel tank that was used, it had a fuel line that was run to the tank on the back. Every time my boss would pay for gasoline he had to complain about paying for 500 gallons, but getting only 490 because that truck was sucking down his gas and it couldn't be proven otherwise!

    I once asked about gas mileage on that truck and if I remember correctly; Three to three and a half is what it typically acheived.

    That truck was finally retired in 1974. It still exists, but hasn't been ran in as many years due to the passing of the owner.

    Rob

    Your story matchs one here. One of our bulk distributors put a V-12 road tractor under his bulk semi tank truck he hauled from the refinery down state. His mileage was right on target with yours. Didn't take him long to trade for a diesel.

    I don't think he had a gas line to the trailer tho.

    Cayoterun

  4. Guys, I am really curious - what kind of power did the GMC V-12 pump engines develop?

    And did it develop the same power on gasoline as on natural gas or propane?

    Looks like a neat project - just saving it from the scrap yard is a good thing!

    Thanks,

    Paul Van Scott

    These #s are from my factory maintenance manual:

    Cubic In. 702.4

    Bore: 4.56

    Stroke: 3.58

    Comp. ratio: 7.5

    S.A.E. hp 99.80

    Gross Brake hp @ 2400rpm 275 Max recommended rpm 2400

    Gross torque 630 @ 2400

    Net torque 585 @ 2400 Torque #s aren't a typo. The motors are luggers.

    Since natural gas and propane doesn't develope the same as gasoline, I know that when they needed to be bored, they had a

    propane/hi-altitude slightly domed piston they used which are in the engine I have.

    I don't understand GMCs hp ratings, as it seems they should be rated higher.

    I really like to hear them start and run. They have a sound all their own. and LOUD.

    Hope this is helpful and not too long winded.

    Cayoterun

  5. Is there any of those old cummins engines that burn diesel and natural gas still out there in the field?

    I have not been out there in a long time .

    They're still using alot of natural gas coverted cummins, Minneapolis-Molines here. Many of them have changed to straight diesel engines now. For awhile, they could burn diesel cheaper than natural gas from wells on their own land. Don't make sense, but the gas companies that produce them had them bound by contract. Many foreign diesel motors, Dawoos, etc. are used now too. Won't be many years 'til irrigation will be history here. Water table falling, hence weaker wells, high fuel costs, etc. We never did drill wells on our place, and glad we didn't.

    Cayoterun

  6. I looked at the video of the engine running.I have worked on those engines years ago when they were used in the trucks.I see it is on propane and i wander if there is still a problem with the rings seating when on propane. When i worked propane engines we most the time could break them in on gasoline but if we could not there was special procedure to build one that was going to start up on propane. I have seen good results out of propane and natural gas when done right.

    All this engine has known is natural gas. It ran stationary on a 10" water pump from '64 thru '85. I tore it all down, and cleaned all the gunk out I could. Put a used head and two used pistons in and it runs pretty good now. Of course, new parts are history. It has .30 over propane pistons, and standard bearings. The engine has the equievelent of 5.5 million miles on it. That's stationary, 24/7 for about 6 mo. a year for 21 yrs. No telling how many times it was overhauled, at least one bore job. All engines run a long time on the pumps. Must be the constant temp, lube, & rpm. The farmers loved these and V-6s both. The sure burned lots of fuel. It smoked pretty bad on first start up, but changed one head and piston, and it runs pretty clean now. It will always use some oil tho. A neighbor had one, burned propane while natural gas line was being worked on. It used 22 gal an hour on propane.

    They are a simple and easy old engine to work on, aren't they? I'm enjoying trying to get it up and running in something. Feel like I'm saving a piece of GMC history.

    Cayoterun

  7. post-2012-1200852301_thumb.jpgpost-2012-1200852329_thumb.jpg

    The V-6/V12s were built by GMC from '60-'66. I went to work for the guy that put this engine in service in 1964. I came out of the Army and started taking care of it in Feb. '65. Decided I wanted to do something besides old cars/travel trailers. The engines are almost all gone to the scrape pile. Found this in a neighbors barn. Was reunited with her after 42 yrs. She's up and running now, and am wanting to put her on a 1-ton truck frame and suspension/w a '62 GMC cab and front clip. Have a video of her first start and run on Utube.

    Cayoterun

  8. Well..........like mentioned it could have a choice of three different trannys. Duplex(10 spd), triplex(15 spd), Quad(20 spd). Is there a tag above winshield(in center) that shows shift pattern. It should unless someone removed it, or tranny was changed. Try shifting both levers and see what kind of pattern each has.

    The Duplex will have the right stick only move forward/back(compound) and the left stick will be 5 spd.

    The Triplex and Quad box will have left stick(compound) either 3 or 4 spds and right stick will be 5 spd.

    The extra splitter on handle could be PTO control? or tailgate control? Two speed axle someone added? Who knows?

    The B was made '53-65 with alot of configurations, three cab designs, two hood lengths, two hood widths. Price? That usually depends on what you are willing to pay, what he is willing to sell for. Location has alot to do with pricing also. $1500 might be good price, others might want $5500 for same truck. The floor is easily replaced, as I put a new one in my truck after I bought it. It was rough in the corners under windshield(that leaked) and I cut it all out and replaced it.

    Hello, Hope it's ok to ask my question on this thread?

    It pays to look and read. We were wondering what years the Bs were built, and bingo, here it is. '53-65. I knew of the two hood lengths, but didn't know about the cab designs and hood widths.

    My son is 6'4" and the B Models were never very "tall" friendly. Is there a cab/w long hood with more leg room?

    Also, I'd better 'fess up. I sold my B61 several years ago, so maybe shouldn't have listed it as it appears I still own one.

    Thanks,

    Cayoterun

  9. Welcome to the site Cayoterun. I've seen you on the 67-72chevytrucks site also. How's that v-12 coming along? Always look at truckpaper.com sometimes b models appear around your way or relatively close. Good Luck

    Thanks for the welcome. NoClueJoe66

    Been slowed down on the V-12 lately. Had two family funerals to attend in NM.

    Have the motor up and running pretty good, just trying to match a clutch/pressure plate, and 5over tranny. Meantime, been taking trucks apart. The direction we're going now, we'll use a '72 Ford 159" wb frame & suspension, '62 GMC cab/front clip, & 9' flatbed. Not too crazy about the twin-I beam, but in good shape and cheeep. This truck won't be driven very much anyway.

    If anyone here has an extra 5spd overdrive, 1 1/2" 10 spline /w a 1" pilot input shaft tranny, I'd sure be interested.

    Thanks,

    Cayoterun

  10. Cayoterun,

    You might contact B61 Fred on this site.

    He has several B73 or B75 trucks that he might consider selling.

    All are in need of restoration, but have decent sheet metal, if my memory is correct.

    And, he is in southern Indiana, which isn't too bad for you.

    Good Luck!

    Paul Van Scott

    I'll try to find B61 Fred. I'm not familiar with this site navigation yet, as well as not too good with computors.

    All my son really cares about is good cab and sheetmetal. He wants to hide a late model driveline under it, slick it up real nice, and go turn some heads. I've always liked fixing up the old iron and now both my sons have caught the fever. When we finish one, we want to use and enjoy them.

    Thanks,

    Cayoterun

  11. Hello,

    First time here. Drove road trucks in the early '60s. Was around B Models, both tri-plex and duplex. Always liked the trucks. Moved to farm in western Okla mid '70s. Used a '64 B Model, duplex, single axle for years hauling farm machinery locally for own use. Two sons grew up with the truck, now one of them wants to find and restore a B75 with a modern drive line under it.

    I've restored 9 late 50s-60' convertable cars, 2 old travel trailers, and now working on putting a 1964 GMC V-12 propane motor in a one ton truck. All as a hobby.

    I like the idea of him wanting to fix up an old B75 to road worthiness, so have found this site looking for info and learning what you guys are working on. He is a road driver now, but both of us will be reading this forum.

    Now retired, rented out farm, but still live here and have the shop to tinker in.

    Looking forward to learning what's going on in the old B Models world.

    Thanks,

    Cayoterun

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