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 91 
 on: January 22, 2017, 06:44:01 AM 
Started by MC8Mike - Last post by luvrbus
Mainly low profile oil pan.



The 4000MH has the low profile oil pan

 92 
 on: January 22, 2017, 06:42:49 AM 
Started by MC8Mike - Last post by buswarrior
The latest Allison in a new Prevost H3 45, Volvo engine, regularly see the tach at 1000 rpm, 1100 rpm, 1200 rpm.

Busnuts need to be painfully aware that an older B500 can't/shouldn't be operated like these new ones...

As usual, there's more to the story...

happy coaching!
buswarrior


 93 
 on: January 22, 2017, 06:36:53 AM 
Started by MC8Mike - Last post by TomC
Mainly low profile oil pan.

 94 
 on: January 22, 2017, 06:22:23 AM 
Started by lvmci - Last post by bevans6
If you can read the signal on the R terminal with a volt meter depends on the meter, and what you want to know.  The alternator pulses on the R terminal are half-wave rectified DC, and since there are three diodes they pulse at three times per rotation of the alternator.  If you have a 24 volt system (nominal 24 volts, it's really 28 volts or whatever your regulator is actually set to regulate to) they will pulse from zero to plus 24 volts.  The reason it's called 12 volts is you are getting only half the pulses, so the average voltage is half of the normal output.  You can read them with a volt meter but what you read will depend on the meter, if I put my meter on RMS AC I would expect to read somewhere around 9 or 10 volts.  A typical digital voltmeter would not have a frequency range, but if it did it would probably read the frequency of the pulses, that's effectively what the tachometer is doing, of course.  If you know, or can calculate, the drive ratio of the alternator compared to the crankshaft you know the frequency anyway.

The main output of the alternator is through six diodes, and is full-wave rectified DC pulsating at six times the alternator rotation frequency, but because it is connected to the battery it is effectively a smoothed out plain old DC voltage.

What is it exactly you want to read?

Brian

 95 
 on: January 22, 2017, 05:37:41 AM 
Started by MC8Mike - Last post by luvrbus
The last 4000RDS (B500 with PTO for trucks) I drove, on partial throttle, it up shifted at 1,500 and didn't down shift until 1,000rpm-from the factory. Good Luck, TomC


There is a difference between the 4000 series and the B500 the "B" is a bus only transmission it is a $3500.00 upgrade from a 4000 in a Prevost fwiw,plus that Allison is a 5th generation it tells the engine what is needed 

 96 
 on: January 22, 2017, 04:57:50 AM 
Started by AstroLiner - Last post by Zephod
Weld it?

I have an arc welder and I'm in SC though my welding is fairly rough and ready.

 97 
 on: January 22, 2017, 04:56:01 AM 
Started by Danny Holder - Last post by bevans6
In the simplest way to explain it, you are running the right hand light and the left hand light in series, so they each get 12v shared from the 24 volt supply.  The relay adds a switched center tap connection to the 12 volt tap on the battery pair so that if one light fails the other side still has it's 12 volts and works just fine till you replace the bulb.

Brian

 98 
 on: January 22, 2017, 04:43:08 AM 
Started by MC8Mike - Last post by bevans6
I laughed when I read that comment that I made, and really laughed when I realized it was made in 2014, and now it's 2017!  Damn, time flies when you are having fun.  Auto project is on hold till spring, I lost my weather window.  I am making a guitar this winter instead.

Thank you very much.

Brian

 99 
 on: January 22, 2017, 04:39:39 AM 
Started by MC8Mike - Last post by blue_goose
jack you have the whole axle assembly , or  just the pig head  , anyone know if this will fit in a 8 housing that is for the 4:11
I have the head, MCI may be able to tell you if it will fit.   Model C  3121F1800
Jack

 100 
 on: January 21, 2017, 10:59:20 PM 
Started by MC8Mike - Last post by TomC
The last 4000RDS (B500 with PTO for trucks) I drove, on partial throttle, it up shifted at 1,500 and didn't down shift until 1,000rpm-from the factory. Good Luck, TomC

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