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Old 10-21-2013, 08:55 PM   #11
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Re: RPM's on a Cummings

Thanks Nat I'll take a look, mine runs off the alternator
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Old 11-12-2013, 12:23 PM   #12
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Re: RPM's on a Cummings

Finally found time to open up the dash theres a black screw on the tach that when I turned it was able to bring the rpms at idle showing 900rpm and when holding the pedal down 3500 rpm, does anyone know what the idle rpm should read I'm thinking around 500rpm's but going to start researching
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Old 11-20-2013, 01:57 AM   #13
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Re: RPM's on a Cummings

The 5.9L and the 6.7L Cummins in the Dodge pickups like to idle at about 600RPM and hit the redline at about 2800 rpm.
Which Cummins do you have in the bus? I have the 855 CID 250 hp Cummins in two of my x-military trucks, and they do not want to go over about 2200 RPM max at factory redline or you better bring a big box to put the parts in!
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Old 12-04-2013, 11:12 AM   #14
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Re: RPM's on a Cummings

Quote:
Originally Posted by dburt
The 5.9L and the 6.7L Cummins in the Dodge pickups like to idle at about 600RPM and hit the redline at about 2800 rpm.
Which Cummins do you have in the bus? I have the 855 CID 250 hp Cummins in two of my x-military trucks, and they do not want to go over about 2200 RPM max at factory redline or you better bring a big box to put the parts in!
I have the Cummins 6CTA8.3 250hp, at least thats what the build sheet says, I was giving everything the school was giving when they bought the bus including blueprints, this thing even has a binder that list every single part & who manufactured it that went into the bus
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Old 12-04-2013, 02:48 PM   #15
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Re: RPM's on a Cummings

if you get the engine serial number I can get that infomation for you.

Chuck
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Old 12-13-2013, 01:16 PM   #16
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Re: RPM's on a Cummings

Quote:
Originally Posted by cschlessman
if you get the engine serial number I can get that infomation for you.

Chuck
Thanks, I have a line on a couple of 1988 Crowns that are going to be crushed in a few weeks, their close by so it sounds like I can get a Tach & altenator pickup off them & try that first, I'll let you know, Stuart
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