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Author Topic: Motor serial # info  (Read 4901 times)
RickB
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81 MCI 9 smooth side 8V71 Allison 754




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« Reply #15 on: October 19, 2010, 06:10:01 PM »

It says on the chart that I have a 74-75 era 8V92. It would have been the 1622nd 92 ever made. But what about the clear 8v71 embossed on the aux drive pulley?

Don was right that the 71 series starts with 8VA and the 92 starts with 8VF

Is anyone else confused here?

Nick is this a practical joke of some kind? Grin

Rick
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luvrbus
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« Reply #16 on: October 19, 2010, 06:23:02 PM »

Rick, here is what that serial number covers 1974, 8v92 N/A 9270 injectors 280 hp not a chance for that serial number to be a after cooled block they just added a turbo no type cooling in the early 1974 models I think it stared in the 3000 serial numbers


good luck and sorry
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RickB
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« Reply #17 on: October 19, 2010, 06:44:27 PM »

Clifford,

Do I have to have the aftercooler if I'm only running 13-15lbs of boost? I figure that the wet sleeve has got to be more heat resistant than the dry sleeve and they ran without aftercoolers at first didn't they? I'm not looking to try and get 450 HP out of it. 350 would be one heck of an improvement. Not to mention the help in the mountains.

Thanks to you and Don for helping all of us so much.

Rick
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belfert
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« Reply #18 on: October 19, 2010, 06:48:27 PM »

My limited knowledge is that MCI didn't put 8V92s into their buses until quite late in the MC9 run.  You have an MC8 so it would be highly unlikely to be an 8V92 from the factory.  The motor could certainly have been replaced at some point.
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Brian Elfert - 1995 Dina Viaggio 1000 Series 60/B500 - 75% done but usable - Minneapolis, MN
RickB
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« Reply #19 on: October 19, 2010, 06:52:00 PM »

Brian,

Actually I have a 1981 9 model so the motor has definitely been changed out at some point.

RB
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RickB
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« Reply #20 on: October 20, 2010, 03:47:27 PM »

Alright Clifford and Don,

One of my mechanics doesn't believe I have the 92 the other does. I pulled the valve cover and found I have blue 7E60 injectors, the 4 valve heads and the only numbers I could find were as follows:

On the inside of the valve cover stamped into the head was 72210 L

on the outside casting toward the rear of the motor outside the valve cover was: 5117433

If my motor was rated at 280 HP with 9270 injectors I am thinking that 60's are robbing me of even more of my power.

I'm on the hunt for exhaust manifolds and plumbing for the turbo and then I'm hoping you guys can help me decide which turbo and injectors I should use. I know they are interchangeable but I found some of the old 92 series sticker on the breather.

Did I tell you all that I found documents of new mains and rod bearings 20 k miles ago!! ;DWoo hoo

RB

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luvrbus
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« Reply #21 on: October 20, 2010, 03:59:42 PM »

Rick, you have 71 series heads,  the 8v92 head will be 892222 you have a 71 series buddy 


good luck
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RickB
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81 MCI 9 smooth side 8V71 Allison 754




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« Reply #22 on: October 20, 2010, 04:27:13 PM »

Clifford,

Two questions and then I'll go to a corner and pout Angry

Is there any way they stuck 71 heads on a 92 block? I can't imagine they would bolt right on

So if it is an 8v71 with the serial # on the block how am I ever gonna be able to get parts that fit?

A 71 with 7E60 injectors? that has to be like a 225 HP motor... I get the feeling Gumpy's gonna start believing me when I complain about HP  Grin Grin

Is anyone else a little confused here? #'s on the head say 71        #'s on the block say 92.... whatever

Nick your 8V7192 comment is starting to seem entirely possible.

Rick
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belfert
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« Reply #23 on: October 20, 2010, 04:40:01 PM »

Actually I have a 1981 9 model so the motor has definitely been changed out at some point.

I'm getting my posters confused I guess.  I don't know why I thought you had an MC8.  MCI did do some factory installations of 8V92s in the MC9, but not sure what year(s).  Custom Coach has a 1983 MC9 for sale with an 8V92.  No idea if factory or not.
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Brian Elfert - 1995 Dina Viaggio 1000 Series 60/B500 - 75% done but usable - Minneapolis, MN
Dave5Cs
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1979 MCI MC5Cs 6V-71 HT-740 Allison, Roseville, CA




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« Reply #24 on: October 20, 2010, 09:44:59 PM »

Ah Rick stop it What are you B-----ing about I still have a 6V Can you put 12 V heads on a 6V LOL Grin

Dave
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robertglines1
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« Reply #25 on: October 21, 2010, 04:49:40 AM »

..Awhile back..someone posted a seller had a 871 with 92 heads on it. the response was the valves would hit sleeve's/ with that said would it not be opposite? they would bolt up? Your mechanics and for sure me or confused..either way enjoy the beast with family. Bob
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Bob@Judy  98 XLE prevost with 3 slides --Home done---last one! SW INdiana
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« Reply #26 on: October 21, 2010, 05:06:51 AM »

Head bolts are different between a 92 series and 71 series fwiw


good  luck
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robertglines1
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« Reply #27 on: October 21, 2010, 05:13:36 AM »

Thanks for clarification the head exchange ?no go. Bob
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Bob@Judy  98 XLE prevost with 3 slides --Home done---last one! SW INdiana
RickB
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81 MCI 9 smooth side 8V71 Allison 754




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« Reply #28 on: October 21, 2010, 05:58:02 AM »

The pickle that this puts me in is how am I gonna get parts for a motor that has part #"s from a dry sleeve and a wet sleeve on the same motor?

Can you imagine the discussion at the parts counter?

"Yessir I know the block say's my motor is a 92 but my heads say 71 would you care to guess?"

The torch is getting warmed up to cut that tow hitch off... just kidding... kind of

Rick
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Geoff
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« Reply #29 on: October 21, 2010, 06:33:59 AM »

Rick--

You have a strange engine.  For your information when a new replacement block came from Detroit it was up to the mechanic to stamp the serial number on it.  Maybe somebody goofed.

--Geoff
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Geoff
'82 RTS AZ
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