Heavy Duty Engine

First Start

Category:

Howto & Style

Tags:

• Diesel
• Engine

[TestECull]

Someone tell these dipshits to let the damn thing idle for a minute before they kill it. They'll fry turbos quite frequently if they let them spin down without oil pressure.

[TestECull]

All engines are subject to the same wear factors. As such, they're all just as likely to have internal mechanical failure. The reason Japanese engines seem to outlast contemporary American engines is that they're better with the electronics that run the damn things. Note how American engines went from stone cold reliable to complete shit as they got more and more electronically controlled.

[TestECull]

@ricturtle Oil coking is not the only way a turbo can fail when the engine is shut off as soon as it drops to idle. When the oil pump stops working the turbo loses oil flow, but the turbo keeps spinning VERY fast. It then runs dry of oil. When it runs dry you get metal-to-metal wear, and that fries turbos FAST.

Let it idle for 90 seconds before killing the motor.

[ricturtle]

@TestECull I don't care if i answered a comment that is now a only 1.7 years old........ I was wondering whether you understood the concept of oil coking up??? As a mechanic i think that you are panicking for no apparent reason. a short run will never coke bearings.

When you run a turbo under heavy load and turn it off straight away then your turbo will screw up.

[seapeddler]

Turbo with ceramic impeller/housing and ceramic bearings. Run nitro if you wish.

Can't coke, as nothing can stick to it.

[ricturtle]

@TestECull, Technically you are both right and wrong, In my opinion and for my 20 cents worth a turbo will die when you shut down an engine at full load when it it glowing red, then it will coke up oil, Then i AGREE that you should wait and let the engine idle for a few moments, then shut down the engine, How ever when you shut down said engine the turbo will still be running for a couple of minutes with out oil, the only exception to this is the big ship engines and they have there own oil.

[TestECull]

@ricturtle 1: You replied to a year-old comment.

2: If the turbo is spooled when the engine is shut off it spools down with no oil. They coke up the bearings. Constantly shutting it off while the turbo is spooled will prematurely wear the turbo bearings out, and when that happens the turbo fails.

RTFM of any turbocharged vehicle, you'll note they all universally stay to idle the engine.

[ricturtle]

@TestECull I have been around engines for a long time and i have never seen a turbo crap out after a short run like that.

[ricturtle]

there is no load on that engine, What is the point of idling an engine for a minute or 3 minutes when the engine is cold, The idea of idling engines before shutdown was to let the engine cool itself before it shut down or else you end up with a dead turbo and an engine in thermo shock. but that turbo is ok as it was not red hot

[flaskandsarnies]

My turbo is still going strong and i don't cool it aftera run, thats 5 years now...

[flaskandsarnies]

There are some generalisations going on here, some turbos have foil bearings, some run on a film of oil, some use special ball bearings, they all get hot but it is relative, agreed if it is red hot then i would let it cool a bit first, bt what these guys seem to be doing is almost not loading the engine and the turbo doesn't appear to be working much, and diesels exhaust runs cooler than gasoline engines.

Anyway this could go on forever as an arguement, lets just agree to differ.

[TestECull]

The turbo is still twirling around at nearly 100,000 RPM with no oil. It will seriously shorten it's life. You need to let a turbocharged engine idle for a few seconds before shutting it off, load or no load.