throttle body 1

[redlinej]

Hi,
i have being working with diesel generator for over ten year and only yesterday on a truck i came across a throttle body on a diesel engine and found it strange cause i never seen this before, so can you guys please explain its purpose.

 

[Lou Scannon]

aSSuming it's a modern emissions compliant diesel engine, the throttle body may be used for air/fuel ratio control, in service of the exhaust aftertreatment system, for example.

"Schiefgehen will, was schiefgehen kann" - das Murphygesetz

 

[MikeHalloran]

A throttle body closes gradually to control the manifold pressure of an SI engine.

What you probably have is a safety device called a shutoff. When you pull the cable, a blade or butterfly snaps shut, completely closing off the the Diesel's air supply.

Cutting off the air suppply is the only way to save a runaway Diesel from destroying itself. A runaway doesn't happen often, but it does happen. Diesels normally run with the air supply wide open, and speed is controlled by metering the amount of fuel oil that's injected. Unfortunately, Diesels will also happily run on their own lube oil, e.g. when a piston ring fails. Shutting off the fuel supply won't stop the engine if it's running on lube oil.

I personally think shutoffs should be required on all Diesels, but most manufacturers would prefer to saddle the owner with the cost of a runaway, and pretend it never happens to their engines.







Mike Halloran
Pembroke Pines, FL, USA

 

[redlinej]

thanks guys,but the lever that control the amount of air also control the amount of fuel at the same time ,the manufacturer of the engine is Toyota.

 

[hydroman247]

You got a model / year?

 

[WGJ]

On some 'modern' diesels, a throttle device is used to help control the ratio of clean air to EGR.

Bill

 

[1gibson]

A picture is worth a thousand words.

A complete description of the question, is usually worth an answer.

Year, make, model, # of cylinders, displacement, location (who knows what it could be if it is in California.)

 

[ivymike]

on a truck: so somewhere between 5 and 18 liters, most likely
the lever that control the amount of air also control the amount of fuel at the same time: If it's a mechanical rack engine, then it very likely does not have any "modern" emissions control equipment on it

Is this by chance a naturally-aspirated prechamber diesel engine (with indirect injection)?

 

[IceStationZebra]

Give WGJ a beer! ISZ

 

[WGJ]

Free beer? There has to be a catch.

Bill