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vontrial · Joined: 25 Aug 2006 Posts: 90 Location: MS

I have a Detriot engine that has a lot of blow by mechanic said some det,engine does that. its a 430/500. Also thinking about pulling flabed,my wheelbase is239,trans 10 speed with 3:90 ratio just wondering would that be good spec since a lot of load will be heavy.. I use 1 gallon of oil between oil changed 12000 miles I changed oil every 15,000. Avg about 6.3 miles per gallons, Thanks

ChrisSai · Joined: 09 Feb 2005 Posts: 34 Location: MidWest

Is the blowby coming out of the bottom tube? I have seen Detroits that test good on the Dyno but still have alot of smoke coming out of this tube. It may be a failing air compressor.

vontrial · Joined: 25 Aug 2006 Posts: 90 Location: MS

Yes it is coming from the bottom tube

roadranger

vontrial wrote: I have a Detriot engine that has a lot of blow by mechanic said some det,engine does that. its a 430/500.
We got that same motor/rating with the some problem. It started when the coolant system sprung a leak and the motor ended up severly overheated. That was over a year ago and it hasn't gotten worse. Motor has no torque at low end though - don't know if it was OK before. Very unpleasant motor to drive, if it didn't have a 13 speed you'd have to rev the crap out of it to keep from falling off the low end of the torque curve when you shift up. Much prefer our m11/330hp tractor - that's how bad it is :shock: ! Our detroit 470hp/1800rpm tractor has plenty of torque down to 1000rpm but that 430/500hp/2100rpm detroit just has no guts unless you get it up over 1200rpm and then it takes forever for the turbo to spool up :cry: .

mrpersons · Posted: Wed Sep 13, 2006 9:25 pm Post subject:

<b>roadranger</b> Check your intercooler for leaks (have it pressure tested), sounds like that may be your problem there.

roadranger · Posted: Thu Sep 14, 2006 4:34 am Post subject:

mrpersons wrote: Roadranger, check your intercooler for leaks (have it pressure tested), sounds like that may be your problem there.
Yah, I suspected that is the place to start - but it ain't my truck and the boss likes to wait until something gets really bad to fix it. Also the MPG sucks, I only get 6.25 out of the aerodynamic truck (Int'l Eagle condo w/side extensions and 13 speed) with this 500 detroit where I get 6.75 out of a less aerodynamic truck (Ford Aeromax w/wing and 10 speed) with a 410 cat - both 3.70 rear ends. The Detroit in the better truck should be at least .25 better, not .5 worse! :shock:

vontrial · Joined: 25 Aug 2006 Posts: 90 Location: MS

What exactly is the intercooler and what is it purpose, would like to know before I carry to have it check. The blow by is a white smoke. Thanks again

roadranger · Posted: Fri Sep 15, 2006 4:08 pm Post subject: Re: Intercooler

vontrial wrote: What exactly is the intercooler and what is it purpose, would like to know before I carry to have it check. The blow by is a white smoke. Thanks again
Actually I think he was talking about it being a possible reason for my lack of low end torque - can't imagine how it would cause blow-by. Anyways the intercooler takes the air compressed by the turbocharger (which heats it up big-time) and cools it down 300 degrees or so. Looks liike a radiator placed in front of the coolant radiator. Cooler air has more oxygen per volume so the engine computer can inject more fuel for more power if the air is cooler. If there is a leak the pressure doesn't build as fast as the RPM's come up so the computer won't inject as much fuel at lower RPM's as it would normally which give you the low torque I'm experiencing.

uncleal13 · Joined: 30 Nov 2005 Posts: 75 Location: Humboldt, SK

Blow by can also be a sign of worn piston rings.

roadranger · Posted: Fri Sep 15, 2006 7:45 pm Post subject:

By the way, my blowby is so bad that I can't leave it running without folks coming up to me to tell me my truck is "overheating" :shock:

allan5oh · Posted: Sat Sep 16, 2006 12:32 am Post subject:

Uhm, white smoke blowby? Hows your coolant doing? Is your oil pressure higher then normal? What does your oil look like?

vontrial · Joined: 25 Aug 2006 Posts: 90 Location: MS

Well kinda like white smoke or fog, roadranger my isn't quite that bad. thanks for info on intercooler

SteveBooth · Joined: 18 May 2005 Posts: 3501

My Detroit 60 does the same thing once in a while. Mine looks like fog or steam and not a darker smoke color.

vontrial · Joined: 25 Aug 2006 Posts: 90 Location: MS

My coolant is fine although I noticed I have a leak around the bottom of radiator around the neck, oil pressure is fine also my oil look fine. Will get my oil changed Monday and check on leak on radiator and have my intercooler check. Thanks

stranger · Joined: 08 Oct 2006 Posts: 59

[quote]roadranger wrote:
Motor has no torque at low end[/quote]

Check the rubber hose from the compressor to the intake. I should be blue if it is a factory hose. This hose is pressurized by the intake to help the compressor build air faster.

If a hole comes in this hose, which usually happens on the lower back side, you will lose a lot of air charge to the engine. This results in low horsepower and torque, and decreased fuel mileage.

This is very easy to check and replace.

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