what is this part and for what is on engine's bloc

[basamir]

Hi all,

Plz can you tell me what is the role of this part

and how can i check it plz?

 

[basamir]

it's installed abouve the Injection pump.
Any help plz

 

[mikestrivens]

some photos and a description of the part and its location would be helpful.

 

[basamir]

Ok part number 155 plz

 

[mikestrivens]

and the car details and what makes you think it needs checking?

 

[grober]

Its a heat exchanger for preheating the fuel. http://www.detali.ru/cat/oem_mb2.as...GM=717.417&CT=M&cat=19S&SID=07&SGR=120&SGN=04

 

[mattkh]

Its a heat exchanger for preheating the fuel.

Hi
Does it use warm water for the heat??

 

[basamir]

i think so but how i dont know????
And why heating fuel ???

 

[Number_Cruncher]

It uses the engine's coolant in the cylinder head's coolant space to heat the fuel.

There's a thermostat in there which allows warm fuel to bypass the heater. The fuel is heated to prevent waxing in the fine secondary filter. I suspect that in Barcelone, this part doesn't actually see much use.

There are only a few ways it can fai;

1) leaking coolant into the fuel - this would be quite obvious
2) leaking between the fuel and the outside of the heater - this would be quite dificult to track, as you would more likely get air in rather than fuel leaking out. To test, I would seal one port, and test under vacuum with a mityvac.
3) failure of the thermostat - I've never seen any specs for the thermostat or a reasonable test method.

 

[basamir]

It uses the engine's coolant in the cylinder head's coolant space to heat the fuel.

There's a thermostat in there which allows warm fuel to bypass the heater. The fuel is heated to prevent waxing in the fine secondary filter. I suspect that in Barcelone, this part doesn't actually see much use.

There are only a few ways it can fai;

1) leaking coolant into the fuel - this would be quite obvious
2) leaking between the fuel and the outside of the heater - this would be quite dificult to track, as you would more likely get air in rather than fuel leaking out. To test, I would seal one port, and test under vacuum with a mityvac.
3) failure of the thermostat - I've never seen any specs for the thermostat or a reasonable test method.

the climate is always hot is what I can remove this part.

 

[Number_Cruncher]

Why are you looking at and thinking about this part?

 

[basamir]

Why are you looking at and thinking about this part?

Because i have a gas oil escape in this part and a catch of air in the gas oil circuit :Oops:

 

[Number_Cruncher]

How do you *know* it's the heat exchanger? What tests have you done?

 

[basamir]

i changed all joint of pipes from injection pump to heater and filtre and also pre filtre, and i was push gas oil in the pipe wich one going to this part and i saw that escape exist.

Tell me plz if i remove this part and i past one pipe directly to pre filtre without this part, can the engine work correctly?

 

[basamir]

So can i have a nsewr plz!!!

 

[Number_Cruncher]

If I understand correctly, you have tested the heat exchanger by putting the diesel in it under some pressure, and you've seen diesel leaking out of the heat exchanger.

If that's right, then, temporarily bypassing it to check to see if it is the cause of any problem you're having can't do any harm.

It's not a hugely expensive part, and if you do find that your heat exchanger is causing you trouble, you can replace it, and keep your fuel system standard. As soon as you modifyyour engine, you make it difficult for anyone down the line to work on. Tempting as it might be, it usually costs more in the long run once you molest a standard car.

Do the local vehicle rules in Spain allow you to modify the fuel system in this way?

 

[basamir]

No, in spain it's forbiden to modify fuel system in this way but i want to test the car without this part to be sure that my problem is caused by this part.
Also, if the climat is hot and very hot in summer, i think that the heater is not necessary for having a good performance.

if i underrstand, the heater is working to heat fuel but if fuel is cold what's can happend in this case plz?

 

[Number_Cruncher]

>>if fuel is cold what's can happend in this case plz?

If the fuel gets too cold, it can wax up and block your fuel filters. Your engine would begin to lose power, and eventually might even cut out.

But, you're in Spain, and Summer is just around the corner - fuel waxing is not something for you to worry too much about! - to test your system, as a purely temporary measure, I don't see any technical problem - you'll have to make sure you're OK with respect to Spanish law though!

 

[basamir]

>>if fuel is cold what's can happend in this case plz?

If the fuel gets too cold, it can wax up and block your fuel filters. Your engine would begin to lose power, and eventually might even cut out.

But, you're in Spain, and Summer is just around the corner - fuel waxing is not something for you to worry too much about! - to test your system, as a purely temporary measure, I don't see any technical problem - you'll have to make sure you're OK with respect to Spanish law though!

It is reassuring what you say and it is true that if the climate is hot, fuel remains always harm.

i hope that will solve the problem of cuch of air in fuel circuit by eliminating the heate.

 

[basamir]

Up plz Cruncher what do you think about removing this part?