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Author Topic: jakes for 8v71 fit or not on 92?  (Read 6714 times)
white-eagle
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« on: November 14, 2008, 05:19:34 PM »

we have an 8v92t with high valve covers, no jakes

my local truck junk engine guy says he has a complete set of jakes for me.  when i asked, he said out of an 8v71.

can i use them?  how about part of them, buy the rest fo the parts from jacobs.  i'm tryin to save some money and he wants $400 for all under the valves.
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Tom
1991 Eagle 15 and proud of it.
8V92T, 740, Fulltime working on the road.

Fran was called to a higher duty 12/16/13. I lost my life navigator.
makemineatwostroke
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« Reply #1 on: November 14, 2008, 05:26:15 PM »

Manasst, look on the housing of the Jake if it is stamped 71 and 92A on the top they will work hard to find a set now days just for a 71 series 

make sure the solenoids are the right voltage those suckers cost about 80 bucks each X 4   have a great evening
« Last Edit: November 14, 2008, 05:34:14 PM by makemineatwostroke » Logged
TomC
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« Reply #2 on: November 14, 2008, 09:17:57 PM »

The actual Jake units are the same, but I believe you have to have different valve bridges between the 71 and 92.  Maybe Don Fairchild could chime in here.  Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
JackConrad
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« Reply #3 on: November 15, 2008, 04:21:51 AM »

Tom,
    As was mentioned, the actual Jake solenoids will work, but you will need 92 series bridges. If you get them make sure you also get the fuel jumper lines and longer bolts that bolt the Jakes to the heads, as well as the buffer switch and electrical wires.  Jack
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Growing Older Is Mandatory, Growing Up Is Optional
Arcadia, Florida, When we are home
http://s682.photobucket.com/albums/vv186/OBS-JC/
luvrbus
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« Reply #4 on: November 15, 2008, 06:21:25 AM »

Tom, always buy new jumper lines it is not worth the gamble on useing old fuel lines I made that mistake once ( was told not to btw ) and wound up with a crankcase full of fuel.I changed my gear ratio to 3.36 from 3.70 and the Jakes are not much help till 3rd gear now fwiw  good luck
« Last Edit: November 15, 2008, 06:28:15 AM by luvrbus » Logged
PP
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« Reply #5 on: November 15, 2008, 04:04:56 PM »

I can't help you with your question, but FWIW, I couldn't imagine driving my bus without Jakes. Love em, got to have em  Grin Grin
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bcaddel
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« Reply #6 on: November 17, 2008, 06:50:00 AM »

My son-in-law put a set of Jake Brakes on our 8v-71 two weeks ago. They came off of a 8v-92 he has sitting in his garage and they work great. I did have to spend almost $1,000 for parts like the different fuel cross over tubes, 24v solenoids and some longer bolts ($80 each). The new fuel cross over tubes are the ones with the "o" rings and I must have got one in wrong because I have about a quart more oil in the crankcase than when I started out on our trip over Donner this week-end. I will have to resolve that issue this week-end.

There is a 6% grade that last about 5 miles coming off of Donner Pass into California and I flipped the jake switch and the bus held 60 mph all the way down. I have read about the Jake Brakes for quite a while and I am a definate believer in them now that I have used them. Coming up and over Donner back to Reno was a different story though, 27 MPH up that same grade. Wish I had put the entire engine instead of just the Jake Brake.
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Bob Caddel, Las Vegas Nevada
1971 MC7, 8V71, Allison MT654
Songman
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« Reply #7 on: November 17, 2008, 09:06:45 AM »

Tom,

They will work for he most part. You'll have to change your valve bridges, possibly your fuel lines, and might have to change some electronics depending on if they are 12 or 24 volt. Obviously, you need 12v for the Eagle. If you want to use high idle, then it gets a little more complicated.

I have PM'd you several times over the past 3 months telling you that we can help you with Jakes. Not sure if you are getting them or not. I am helping out Don Fairchild and we can get you all the Jakes you need.
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Sam 4106
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« Reply #8 on: November 17, 2008, 04:49:46 PM »

Hi Songman,
Are the Jakes the same on both right hand and left hand turning engines? How much does Don charge for a complete set of Jakes for a GM4106 with 8V71 left hand rotation engine, with 12 volt solonoids, buffer switch, driver control switchs, and the rest of the parts needed for a conplete installation. The kit would need to be shipped the me for local installation. I don't want to make another trip to the west coast without Jake brakes. I smoked one of the rear brakes on highway 14A going down into Ten Sleep, Wyoming and don't want a repeat of that experience. Kind of made my wife nervous for the rest of the trip. E-mail address will be in my profile if I can figure out how to put it in, or you can PM me if you know how to do that from this board. I don't know how to do that.
Thanks for your help, Sam 4106
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1976 MCI-8TA with 8V92 DDEC II and Allison HT740
white-eagle
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« Reply #9 on: November 17, 2008, 05:06:01 PM »

songman, pm in your mailbox.  thx.
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Tom
1991 Eagle 15 and proud of it.
8V92T, 740, Fulltime working on the road.

Fran was called to a higher duty 12/16/13. I lost my life navigator.
Songman
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« Reply #10 on: November 17, 2008, 11:45:12 PM »

Tom and Sam,

I will talk to Don and get back with both of you. It may be a few days because we are on the road on the way to Seattle for a show. I will get details and prices for both of you.

Thanks,
Dale
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white-eagle
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« Reply #11 on: November 19, 2008, 05:17:32 PM »

i just got a rough price quote from ww williams for installing a used set of jakes on my 8v92.  they figure.  i'm trying to figure if i can afford jakes and installation before i buy a set just to let them age on the shelf.
they figured 30 hours to install at $103 per hour, plus $1700 for parts for the buffer switch ($500) and fuel lines ($1200).

they siad they would have to dismantle radiator, and get the wires back from the front.

i thought jacob's had a video showing jakes install in about 1 day by a sales engineer.  i realize a bus is just a tad tougher than sitting in an open hood truck or bulldozer.  but 20 hours more??

anyone have a thoughts or suggestions?
guess i'll have to lose weight a little and learn how to do it myself.  Sad
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Tom
1991 Eagle 15 and proud of it.
8V92T, 740, Fulltime working on the road.

Fran was called to a higher duty 12/16/13. I lost my life navigator.
luvrbus
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« Reply #12 on: November 19, 2008, 05:47:13 PM »

Tom, the wire is already there for the Jake on your model 15 I will look the tag number up for you, I bought new fuel lines for my 8V92 from Stewart and Stevenson last year for less than 200 bucks and the fast idle buffer switch was less than 300 bucks and it does take a little over a day to install for us non pros. 1200 dollars for fuel lines is 75 bucks each never have I saw them for over $15.00 and that was from a local shop that bought it from Williams             good luck
« Last Edit: November 19, 2008, 05:57:04 PM by luvrbus » Logged
white-eagle
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« Reply #13 on: November 19, 2008, 05:54:30 PM »

you installed yours yourself, luvrbus?  not that i would try it myself, but ...

Nick told me his took 10 hours to install, and cost him $500.  that sounds more than reasonable to me.

my 15 has a different engine from the original.  still high valve covers, but no jakes, no buffer switch and maybe, no wires?  i know the switch is still there though.

thanks for the info on parts.  if i can get the basic under valve cover jakes from someone, then i'll look for the other stuff.
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Tom
1991 Eagle 15 and proud of it.
8V92T, 740, Fulltime working on the road.

Fran was called to a higher duty 12/16/13. I lost my life navigator.
luvrbus
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« Reply #14 on: November 19, 2008, 06:04:28 PM »

I installed mine and your 15 will have a wire from the factory for the jakes at rear the 15 has more room than my 05 in the engine compartment with a 8v92 stuffed in it      good luck
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