help re cool down of crdi diesel engine

**wiper** · December 29th, 2007 11:03 AM

Good am. I would like to ask if it is necessary to cool down the crdi diesel engine of innova diesel, hyundai tucson and the likes. I asked from hyundai regarding my concerned , they say its not necessary because of the intercooler but he speaks only for the hyundai but not sure of other brand. But with vgt crdi engine of carens and crdi of innova, may I ask if we should cool down the engine, if yes for how long.

**Trebuchet** · December 29th, 2007 11:23 AM

I drive an Innova, it do have a turbo but no intercooler.

The SA said to cool down the engine between 2 to 5 mins.

The reason behind this is to release the build up pressure in the turbo itself after driving the car above 80 KPH... and during LONG drives.

And if you're city driving and haven't reach the speed 80 KPH and above, I guess it's safe to not cool down the engine.

BUT for me, city driving or long drive... I still follow what the SA advised.

HTH

**scharnhorst** · December 29th, 2007 12:41 PM

it's not the engine that needs to be cooled, it's the turbocharger. particularly the oil in it.

you'd need to cool it down if you revved the engine hard during the trip.

you can opt to drive really gently (keep it under 2000 rpm) for the last 5-10 minutes of your trip instead of leaving it idle for 5 five minutes.

That or get a turbo timer, which automatically shuts down the engine after a set amount of time after you "turn off" the car.

**C190** · December 29th, 2007 01:03 PM

Originally Posted by scharnhorst

it's not the engine that needs to be cooled, it's the turbocharger. particularly the oil in it.

you'd need to cool it down if you revved the engine hard during the trip.

you can opt to drive really gently (keep it under 2000 rpm) for the last 5-10 minutes of your trip instead of leaving it idle for 5 five minutes.

That or get a turbo timer, which automatically shuts down the engine after a set amount of time after you "turn off" the car.

turbo timer ranges 3k up...
some car alarms are with TT

**CVT** · December 29th, 2007 01:09 PM

Originally Posted by scharnhorst

it's not the engine that needs to be cooled, it's the turbocharger. particularly the oil in it.

you'd need to cool it down if you revved the engine hard during the trip.

you can opt to drive really gently (keep it under 2000 rpm) for the last 5-10 minutes of your trip instead of leaving it idle for 5 five minutes.

That or get a turbo timer, which automatically shuts down the engine after a set amount of time after you "turn off" the car.

This is what I do especially during long drives,- just keep the RPM at about 2K so that the turbo is not engaged, just before I stop for rest or fuel.

5000:boom:

**wiper** · December 30th, 2007 01:23 AM

can you check again, i think the innova have an intercooler. It is situated in the front like the radiator. thanks

**washburn** · December 30th, 2007 03:50 AM

nope wala pong intercooler innova
2.5 Liter Diesel, 4-Cylinder, In-line 16V, Double Overhead Camshaft (Turbo Charged) (2KD-FTV)

not like the fortuner
Direct Injection, 4-Cylinder In-Line, DOHC 16 Valve, Variable Nozzle Turbo with Intercooler (1KD-FTV)

**Drave** · December 30th, 2007 08:58 AM

Originally Posted by scharnhorst

you can opt to drive really gently (keep it under 2000 rpm) for the last 5-10 minutes of your trip instead of leaving it idle for 5 five minutes.

That or get a turbo timer, which automatically shuts down the engine after a set amount of time after you "turn off" the car.

I also do this because I don't have a turbo timer or didn't have it set in my alarm. Fast highways are usually isolated from city streets, therefore, as soon as I leave the highway, I have to traverse some slow streets, and that is the time when I don't rev my engine too much to cool down my turbo.

**ARB** · December 30th, 2007 10:04 AM

sir having an intercooler does not mean that you dont need to cool down the turbo. the work of the intercooler is to cool the air from the turbo before entering the manifolds.

you need to idle the engine after running it because the turbo is still spinning and if you turn off the engine right away the oil supply is cut to the turbo. no oil supply plus a spinning turbo equals worn bearings. that is why idling it will make the turbo stop spinning. since it is powered by the exhaust gasses, during idle there is less exhaust gas force to spin the turbo.

that is why it is a wise investment to buy a turbo timer. yesterday we had a client who bought a turbo timer for his trooper. I asked why only now since his trooper is old already. he said he just replaced the turbo because it broke due to not having to idle it down when it was still new.