[AT] Turbochargers

[Grant Brians]

My turbocharger experience does not include the specific scenario you 
experienced with the bad valves and towing, but on every turbocharger 
failure or wear situation I have encountered you can hear the crackly or 
metal noises. Rebuilds on turbochargers by a competent shop if only 
bearings are the issue should be reasonably affordable. I have had to do 
Massey, Ford, Same and Isuzu turbos. Only one of the Isuzu turbos caused 
major damage internally to the motors because the others were caught 
before doing so.
      Heat is the major enemy of turbocharger bearings. This is why 
diesel turbos usually are intercooled. As long as oil is present on the 
surface of the bearings, little damager can occur. Wear is the main 
reason why oil could not be on the surface of the bearings because it 
could then be worn off the surface. The lack of power could be air 
filtration, residual damage in the engine, air in fuel, timing or the 
turbo. If it is the turbo the sound is distinctive.... Record the sound 
and play it for a diesel mechanic at a fuel injection shop over the 
telephone and they should be able to determine if that is the issue.... 
I would also REALLY inspect the air filtration system and make sure no 
dust could be making it into the engine.
             Grant Brians - Hollister,California farmer of Vegetables, 
Nuts and Fruit
On 11/11/2015 3:10 AM, Cecil R Bearden wrote:
> It  has its own oil supply line, but when on the trailer, if air would
> flow through the exhaust pipe which was curved and open to the front,
> and both valves open on one cylinder (one valve head broken off the
> other bent severely) then the turbo would be spinning without oil being
> supplied to the bearings.   The lack of power is what really worries
> me.  It is as if the governor is wide open.  There is no reserve power
> when pulling the baler.  There is the possibility that it is leaking air
> into the fuel through the quick connector.  The squeak just does not
> sound like a belt, it sounds metallic.  It is a 4 hr job and between
> $600-$1500 for a turbo rebuild.
>
> Cecil in OKla
>
>
> On 11/10/2015 9:32 PM, Greg Hass wrote:
>> I have a limited knowledge of turbos so I will share what I know. First
>> of all, I don't think they would squeak as they have there own oil
>> supply line with oil being pumped to the bearings at all times. Second,
>> the blade tolerance is so close that any bearing wear will make the
>> blades rub the housing. At one time I was cutting hay with my cousins IH
>> 1066 and when I would shut it off I could hear what I thought was the
>> blades rubbing as they came to a stop. He was taking it to the dealer
>> for some other problem so I told him to have the turbo checked; it came
>> back with a new turbo. Also I have never heard of changing bearings,
>> your just replace with a new or rebuilt unit. As for the noise, I can't
>> say for sure but I have seen belts act like that. My wife's last car
>> would do that. When she started it in the morning, especially if it was
>> damp out, the belts would squeak like craze for a few minutes. I don't
>> remember if the noise stopped when the belts were replaced or not, but I
>> think it did or was not as bad. I'm thinking some of the noise was
>> caused by the older belts being glazed.
>>        Greg Hass
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