PCV on diesel should i run a breather tank??

[scanoslux]

gday ive got a non turbo 3lt 5L-E diesel hilux and il modifying the air intake but wanna know whether or not the PCV should be kept running into the motor. I took the bend off the throttle body and it was packed full of crap but the inlet manifold was shiny and looked clean as, should i run a breather line with a little filter on it, and try and stop the soot blowing back in the motor? any one done or heard of doing this i know its common in petrol but not sure bout the old diesel,
cheers adam

[horseman]

If you don't run the PCV (due to emission and roadworthy standards anyway) you'll find in a very short time that your probably going to be blowing out the rear main oil seal or other seals due to pressure buildup in the motor. Where else is the pressure going to escape to? The PCV valve (Positive Crankcase Ventilation Valve, the name says it all) relieves oil pressure gas in the engine for the gases to be reburnt in the combustion process and if you block it off you will have dire consequences in seals in the engine blowing. The reason that the bend in the throttle body looked like crap is it is before the throttle body (and is not being combusted only flowing into the manifold). The inlet manifold clean means that the gases after the PCV valve are being burnt. No need to run a filter as this will clog much more readily. The gases need a free flow run into the manifold.

[scanoslux]

cheers mate thanks for the advicev ill keep it running i just wasnt sure if there would be any benefit, if shes still all clean i'l keep it that way

[Z()LTAN]

its not going to blow any seals...

it will push your dipstick out first...

Just run it into a oil catch can full of steel wool and be done with it.

[turbogu]

as long as the catch can is vented its fine, have a look at race cars and hot rods etc, every one runs em, just make sure you run big enough lines into it to allow it to breath well enough other wise you 'll run in to problems there with breathing, to give you an idea, ive got an lx slr race car with a turbo'd 186, if i run 5/8 dia it will push oil out of the thing every where under full load, i now run 2 x 1" dia lines into a big baffled catch can and all is fine

[RODEONICK]

If you don't run the PCV (due to emission and roadworthy standards anyway) you'll find in a very short time that your probably going to be blowing out the rear main oil seal or other seals due to pressure buildup in the motor. Where else is the pressure going to escape to? The PCV valve (Positive Crankcase Ventilation Valve, the name says it all) relieves oil pressure gas in the engine for the gases to be reburnt in the combustion process and if you block it off you will have dire consequences in seals in the engine blowing. The reason that the bend in the throttle body looked like crap is it is before the throttle body (and is not being combusted only flowing into the manifold). The inlet manifold clean means that the gases after the PCV valve are being burnt. No need to run a filter as this will clog much more readily. The gases need a free flow run into the manifold.

You need to get your facts straight before attempting to advise others. Diesel engine do NOT have throttle bodies.

[turbogu]

actually a lot of late model i.e electronic injected diesel do run thottle bodies

[RODEONICK]

actually a lot of late model i.e electronic injected diesel do run thottle bodies
can you give me an example? and WTF for? I think you must have misinformation however would be happy to be proved wrong.;)

[Shonky]

can you give me an example? and WTF for? I think you must have misinformation however would be happy to be proved wrong.;)

ZD30 has two butterflies in the intake tract, but they are not actually used to modulate throttle, the first one is used to reduce the intake air quantity to allow the engine to suck in reticulated exhaust gas as part of the EGR system.

This same butterfly also shuts off the air intake completely when the ignition is turned off to allow a smooth shut down rather than the typical diesel thump stop under compression.

The 2nd butterfly is there for the swirl control system to vary the amount of swirl in the combustion chambers before ignition of the fuel mixture. ;)

[turbogu]

ZD30 has two butterflies in the intake tract, but they are not actually used to modulate throttle, the first one is used to reduce the intake air quantity to allow the engine to suck in reticulated exhaust gas as part of the EGR system.

This same butterfly also shuts off the air intake completely when the ignition is turned off to allow a smooth shut down rather than the typical diesel thump stop under compression.

The 2nd butterfly is there for the swirl control system to vary the amount of swirl in the combustion chambers before ignition of the fuel mixture. ;)

Thanks Shonky, most new diesel these days are set up like that, hell even my mates factorty intercooled td 42 patrol has one, when we first saw that we all went what the fu.........

[RODEONICK]

shit hey learn somethin new every day hey. I still really wouldn't call it a throttle body though. I wonder what the manuals refer to them as. Thanks for your explanations guys muchly appreciated.:thumb:
Cheers Nick.

[fullmetaljacket]

I still really wouldn't call it a throttle body though. I wonder what the manuals refer to them as.

got one fitted to my "B" diesel in my 78mdl 40, the book refers to it as a stopper plate or throttle valve (which is the only point on the engine that the accelerator cable connects to) . The "valve" and "stopper plate" only adjust air flow into the engine, and by the positive and negative air pressures applied to either side of the plate during accelleration and decelleration causing vacuum (vac lines connected from the throttle valve to the injector pump), which in turn delivers the desired ammount of fuel from the injection pump to the injectors via ammount of vacuum applied

wow, all that in only 2 sentences.....someone knows grammer good

[BEU77Y]

I've just fitted a catch can to our 105. Kept the original 18mm hose to the can with a 6mm breather hose off the top.

How much air is supposed to be coming out of the breather???? Mine feels like enough to blow out a candle at idle..... Is that too much?

Just hoping I don't have to start checking compression etc.

[Tonka_Tough]

got one fitted to my "B" diesel in my 78mdl 40, the book refers to it as a stopper plate or throttle valve (which is the only point on the engine that the accelerator cable connects to) . The "valve" and "stopper plate" only adjust air flow into the engine, and by the positive and negative air pressures applied to either side of the plate during accelleration and decelleration causing vacuum (vac lines connected from the throttle valve to the injector pump), which in turn delivers the desired ammount of fuel from the injection pump to the injectors via ammount of vacuum applied

wow, all that in only 2 sentences.....someone knows grammer good

the 2H in my 47 is exactly the same.

as for venting hte gas in the crank most of the big trucks just have a hose that drops down just below the steer axel. you if you look closely you can see a bit smoke coming out of them when at the lights, pretty normal realy but im not sure how their set up at the block.

[Bernz]

most truck ones just run a breather out of the rocker covers out to atmosphere but have a hose running down to stop everything getting filthy from the small amount of oil etc in the fumes.
I think its a good idea to go with the catch can, as I had a turboed 1HZ and on a steep hill one day at full noise, a lot of oil pooled at the back of the rocker cover, where the breather hose outlet is and it was plumbed into the intake and the engine started running on the oil, I swtiched it off and she just kept overspeeding. Hate to think what RPM it got too. The only way i stopped it was to rip it into 4th and stall it, then slide backwards down the muddy hill :) . Same thing happened to my mate too, with a NA 1HZ. Both started up fine again after it, but its a small mod to do to save an expensive failure.

[turbogu]

thought id put these photos up from a u.s diesel site im on, 5.9 cummins, twin pumps, twin turbos in a rail dragster and a big ass throttle body to control it all

[L2004x4]

I have a 94 L200 with the 4D56 td and ive added a catch can as the intake pipe down to the turbo was black. heres a pic, the breather pipe stops bout an inch from the bottom of the can.

[del97td]

jeeps and volkswagons come with catch cans standard

[troopymad]

most truck ones just run a breather out of the rocker covers out to atmosphere but have a hose running down to stop everything getting filthy from the small amount of oil etc in the fumes.
I think its a good idea to go with the catch can, as I had a turboed 1HZ and on a steep hill one day at full noise, a lot of oil pooled at the back of the rocker cover, where the breather hose outlet is and it was plumbed into the intake and the engine started running on the oil, I swtiched it off and she just kept overspeeding. Hate to think what RPM it got too. The only way i stopped it was to rip it into 4th and stall it, then slide backwards down the muddy hill :) . Same thing happened to my mate too, with a NA 1HZ. Both started up fine again after it, but its a small mod to do to save an expensive failure.

dont like the sound of that mate
i might fit a catch can to my 1hz,its pritty dirty (oily soot etc) in the intake
pipe

whats the actual main benifit doing this mod?

i checked to see if there was much presure or what i call blow by -but mine
has not one bit at all .

[sc00by]

i have a oil catch can on my 2.8TD triton, it has stoped the grime buildup alot in the intake & intercooler. i bought a catch can and filled it with steel wool from coles just empty it every oil change, very simple mod and worth it i think.heres a pic, its the black thing with 2 hoses attatched at the back :o