[AT] Oliver 990

[cecil bearden]

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----- Original Message ----- 
From: "charliehill" <charliehill at embarqmail.com>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Friday, March 05, 2010 10:38 PM
Subject: Re: [AT] Oliver 990


> Steve you are generally right but if they are very well maintained it is
> possible to stop the leaks and they don't really burn much oil unless they
> have a lot of wear on them.  If the oil rings get worn and you leave one
> sitting running idle it will accumulate oil in the air boxes and run away 
> by
> burning the engine oil.   I've seen a 3-53 and a 6-71 run away.  It'll 
> make
> you run for cover.
>
> Charlie
> ----- Original Message ----- 
> From: "Steve W." <falcon at telenet.net>
> To: "Antique tractor email discussion group" 
> <at at lists.antique-tractor.com>
> Sent: Friday, March 05, 2010 4:19 PM
> Subject: Re: [AT] Oliver 990
>
>
>> charliehill wrote:
>>> You probably have Ralph and didn't know it.  They were common in tractor
>>> trailer trucks in the 60's and 70's.  Often called 318 Detroits or 350
>>> Detroits which was their HP rating.  There was a version of the 8V92
>>> called
>>> a 8V92TT.  It was supercharged and had twin turbochargers (TT).  It was
>>> about 425 hp set up for a truck.  The RPM operating range for those
>>> engines
>>> was 1600 to 2450 RPM.  Being 2 stokes they were not intended to be 
>>> lugged
>>> or
>>> run at low rpm and usually had at least a 10 speed transmission and most
>>> of
>>> the time a 13 or 15 speed.  Once you got used to all that shifting they
>>> were
>>> a lot of fun to drive.   The 13 speeds were basically a 5 speed with a
>>> direct drive and a low and overdrive aux. gear on the back end of the
>>> tranny
>>> that was shifted with an air valve so you didn't have to shift the lever
>>> as
>>> much as it sounds like.
>>
>> Add in just about every large custom fire engine built and many boats
>> and road equipment.
>> There are two easy signs that a vehicle has a 2smoke Detroit in it.
>>
>> Look under it and you will usually see large oil spots (have yet to see
>> one that didn't leak oil)
>> Look near it for the 33 or 55 gallon drum of oil for it (have yet to see
>> one that didn't need some oil added if they were being used)
>>
>> The Detroit is a fun engine but it does have one MAJOR drawback. Because
>> of the engine design it is possible for them to run backwards! We had
>> the ALF engine in service for about 2 weeks when one of out crew parked
>> it on a slight incline. He was trying to back it into a driveway and
>> lugged it down enough that it flipped.
>>
>> This drawback in trucks and dirt equipment was a bonus when used in a
>> boat. They actually would set up one engine to run clockwise and one
>> counter-clockwise to negate the torque effect. Plus they could shut
>> down, hit a different selector and the engines would run in reverse to
>> allow better dock and station keeping.
>>
>> The other minor problem involved the way they feed oil and fuel into the
>> engine. The design is OK unless a couple seals fail. Or the fuel rack
>> control fails. Then you get a runaway engine. In this case you hit the
>> control found ONLY on a Detroit equipped engine. The Emergency Shutdown
>> switch or lever. It closes a BIG flap in the intake and shuts off the
>> airflow into the engine.
>>
>> -- 
>> Steve W.
>>
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