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joeheb
Senior Member
121 Posts |
 Posted - 01/30/2013 : 12:09:40 PM
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| 1999 DT466 mid size bus with hydraulic brakes (just fyi): bus runs just fine, idles just fine. When you're at a stop and take your foot off the brake the bus takes off as if you are stepping on the accelerator but the RPM don't rev up. I checked the RPM with the laptop and it's right on the money, checked the RPM on a sister bus and the RPM were exact (690-700). The transmission shifts just fine, oil is not burnt. Torque converter??? Haven't tried changing filter and oil in the transmission yet I'm gonna wait on some tips from you guys. Thanks. |
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mastertech
Senior Member
178 Posts |
Posted - 01/31/2013 : 08:41:07 AM
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| sound like a at545 converter on the verge of breaking up inside. Hows the fluid look? |
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joeheb
Senior Member
121 Posts |
Posted - 01/31/2013 : 08:54:31 AM
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| Oil looked ok, I changed oil and filter yesterday to see if it would make a difference but no luck. I asked the transmission guy if my problem was a torque converter issue, he sais there is no way it's the torque converter. I asked 2 transmission guys and they both said the same thing. I really do think it's the torque converter my self, when the engine gets to operating temperature is when it starts, cold engine works normal. |
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Thomasbus24
Administrator
USA
3169 Posts |
Posted - 02/01/2013 : 10:19:39 AM
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| AT545 converters are notorious pieces of crap that like to gut themselves internally. I'd suspect it as well. |
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eddo
Senior Member
USA
62 Posts |
Posted - 02/01/2013 : 10:42:54 AM
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my thoughts would be torque convertor as well. Not sure how it could be anything else that would cause that?
From what you are describing- it's as if, as idle, the engine is hooked right up to the rear end- the trans has no neutral while in gear. Correct? What about when you actually put in into neutral? |
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joeheb
Senior Member
121 Posts |
Posted - 02/01/2013 : 11:26:22 AM
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Neutral works just fine. When the engine is at operating temperature is when the problem begins. Putting the transmission in neutral is no problem, when you're driving and come to a stop, when you let off the brake the bus goes as if you are on the accelerator. The engine sounds like it's under a load when you're on the brake, as if you're braking and stepping on the accelerator at the same time. quote:
Originally posted by eddo
my thoughts would be torque convertor as well. Not sure how it could be anything else that would cause that?
From what you are describing- it's as if, as idle, the engine is hooked right up to the rear end- the trans has no neutral while in gear. Correct? What about when you actually put in into neutral?
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IBTMech
Top Member
USA
960 Posts |
Posted - 02/01/2013 : 6:56:23 PM
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| Is this an AT or an MT transmission? If it's an MT, you could have a lockup clutch piston seizing in it's bore creating a drag on the engine through the lockup clutch. It will cook your oil eventually and do a number on your torque converter. (Been there twice.) |
If it doesn't fit, FORCE it.
If it breaks, well, it needed replacing anyway.
Pullin' wrenches for 45 years. |
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joeheb
Senior Member
121 Posts |
Posted - 02/04/2013 : 05:56:07 AM
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AT 545.quote:
Originally posted by IBTMech
Is this an AT or an MT transmission? If it's an MT, you could have a lockup clutch piston seizing in it's bore creating a drag on the engine through the lockup clutch. It will cook your oil eventually and do a number on your torque converter. (Been there twice.)
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joeheb
Senior Member
121 Posts |
Posted - 02/11/2013 : 05:14:11 AM
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| Update: It's fixed!!! It urned out to be the torque converter, both transmission guys that build transmissions for me said there is no way it could be the torque converter, so i replaced it anyways and VOILA....fixed the problem stated in the description. Thanks to all who chimed in. |
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IBTMech
Top Member
USA
960 Posts |
Posted - 02/11/2013 : 3:04:45 PM
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| Probably the stator was seized. |
If it doesn't fit, FORCE it.
If it breaks, well, it needed replacing anyway.
Pullin' wrenches for 45 years. |
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joeheb
Senior Member
121 Posts |
Posted - 02/12/2013 : 1:31:24 PM
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Wiered thing is, it only acted up when it reached operating temperature. I know very little about transmissions, I've only replaced them never repaired them.quote:
Originally posted by IBTMech
Probably the stator was seized.
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Never had this problem before.
