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  #1  
Old 09-13-2003, 01:03 AM
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Join Date: Jul 2003
Posts: 61
Transmission failure from high idle?

I just heard a story about MB transmissions failing while sitting in park or neutral and idling at higher rpm - 2500 or so. The examples I heard were during high-idle emssions testing (pre smog dyno) in CA, and when people would rev thier engines while jumpstarting another car. According to the story, some MB transmissions maintain elevated internal pressure when revved up, even when in park or neutral, and the pressure causes pump failure.

Is there any truth to this one?
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  #2  
Old 09-13-2003, 12:59 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
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How in heaven's name could the pressure be any different in neutral than in gear? The pump turns the same speed either way, and that's where the pressure comes from.

However, "rocking" one of the newer trannys while stuck in snow and overspeeding it in low/reverse WILL fry them, I've seen it.

Peter
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1972 220D ?? miles
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1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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  #3  
Old 09-13-2003, 10:01 PM
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Location: St. Albert, Alberta, Canada
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You're thinking of the ZF automatic made for BMW. The front pump ceases operation at idle, and allows auto-boxes that are used in stop and go traffic conditions to overheat and die an early death. Getting 100k-miles out of a ZF tranny is a big deal as most won't go that far.
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Old 09-13-2003, 10:55 PM
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Hmmmm.

The ZF22 on the Volvo TurboDiesel has 220,000 on it and is the only thing that hasn't given me trouble yet......


Peter
__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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