[MAD_83supra]

2 Toyota techs told me that the little hose from the top of the cam cover to the intake throttle body is not enought to vent the internal pressures, specially if i want to go turbo. (5mge)

Also, I replaced the front seals and I am still leaking very badly from the front pully. So,

I cut the hose from the block to the cam box, the one next to the distributor and put a T and ran a second hose to a breather. I put the breather up high so oil would drain back to the crank ( I ran the hose and breather over to the top area of the clutch resevoir.
Well, this set up just blows a ton of oil out, and puffs like a smokestack.
Is this normal?? My plan was to go to a oil catch can, but I dont think it can handle all this blowby? I have new rings but have not checked compression lately.

 

[SupraFiend]

Dude! Thats not your PCV hose! Sounds like your oil feed line that feeds oil to the head from the oil pump! PUT IT BACK HOW IT WAS!!

The PCV valve feeds into the intake. There shouldn't be any oil running though this hose, even with blow by. You do not want to put a breather in there, just a catch can. Your engine expects the crank case gases to be plumed back into the intake. It helps lower combustion temps among other things. If these techs were saying that hose doesn't allow enough air flow then they're implying that maybe you should tap another hole and run another hose to your intake. If your blow by isn't very bad though you won't get that much coming out of that hose, being turbo will only make it worse if you have bad blowby.

 

[SupraDOHC]

Has anyone tried to take a spare intake cam cover and put it on the exhaust cam side. I might try it since I have a spare set in my basement. I get alot of blow-by too. Is the deal on the throttle body a valve or is it just a hole into the intake?

 

[MAD_83supra]

Dude! Thats not your PCV hose! Sounds like your oil feed line that feeds oil to the head from the oil pump! PUT IT BACK HOW IT WAS

Ahh,, no.SupraFiend. its the crankcase vent hose and it goes up to the to the cam box..then the pressure goes out from the cam box through the little tiny short hose from cam cover to the throttle body(PCV). This hose will soon go to a catch can and that small hole in the throttle body will be capped. I dont want to boost pressure backing up into the head and crankcase.

it looks like the lower pressure from this test has reduced the front seal leaks, I will clean up the engine this weekend to see. This is just a temporary thing till i get a catch can.. I think thats a good idea about venting the other side to a catch can too.

 

[SupraFiend]

I"m still not sure which hose your talking about that runs from the block to the cam towers. If oil is passing through it though, I'd leave it be. As for the hose that actually vents the crank gases to the throttlebody, sure put a catchcan in there if you like, but you shouldn't have any oil passing through it. I also would route it back from the can to the throttle body. I've experimented with this on AE86s. We tried it without the second line routing the gases back to the intake (just let it vent to the atmosphere), and we noticed higher gas milage and obnoxious gases getting into the cabin. I've heard from mechanics that the stock ecu tunning is depending on those gases being there, they help keep combustion temps down and such.

 

[FWDsux]

The hose he is talking about is the oil filler overflow line or something like that. It goes from the oil filler to the block straight to the pan. It can get clogged and cause some problem. I think excess oil sonsumption is one. This hose is ~45 bucks from Toyota.

 

[StanS]

FWDsux

You say that the approx. 3/4" dia hose from the oil filler that goes
down the side of the block can get clogged and cause oil consumption?
I recently developed hi oil consumption. Will check that hose.

StanS

 

[MAD_83supra]

i had to replace this hose(block to cam tower) they get old and crack and leak, but just buy regular rubber hose made for pcv. its $3 from Autozone.

this morning moved the "T" much lower to the block so that the hose i installed goes uphill to the pcv breather ($11 from Autozone). I It took it for a long hard run(250 miles at 80 to 100mph)This worked much much better, no oil blowing out now but i can smell it so.. now I will put a in a catch can. NOt sure how they work or how the hoses run.. yet

it also looks like alot less oil comming from my front seals ( this was my goal)

I will know more once I clean all the old oil up.

 

[Dave A.]

I wonder if there's a way to install a regular inline style PCV valve to help manage the additional volume of blow-by gases that occur on an engine with forced induction? I know for a messy fact that if the PCV orifice in the TB on a turbocharged 5M gets plugged with crud that the crankcase pressure can shoot way up under boost and literally blow the crankshaft seals out of the block. If you're planning to drive your turbcharged MKII during the cold months of Winter, make certain that the PCV system is unobstructed and working up to par.
Also, I don't think the 5M has any direct open connection(s) between the cylinder head and the block to allow for passage of blow-by gases up into the cylinder head area, except for that one single large hose that connects the crankcase to the intake cam tower on the cylinder head. Venting the exhaust side of the cylinder head sounds like a good idea, but please correct me if I'm wrong: I don't think there is a passageway for blow-by gases to enter into the exhaust side cam tower? :?:

 

[Dave A.]

Also, I don't think the 5M has any direct open connection(s) between the cylinder head and the block to allow for passage of blow-by gases up into the cylinder head area, except for that one single large hose that connects the crankcase to the intake cam tower on the cylinder head. Venting the exhaust side of the cylinder head sounds like a good idea, but please correct me if I'm wrong: I don't think there is a passageway for blow-by gases to enter into the exhaust side cam tower? :?:

Oh man! I must have forgotten to wake up this morning!! If their were no direct passageways for oil vapor and blow-by gases to flow between the cylinder head and the crankcase, how in the heck would oil return to the oil pan from both cam towers. And, how in the heck would one be able to fill the sump with oil through the intake cam tower if their were no direct passageways? Duh!!!! Sorry for the long-winded misinformation! :roll: I need a LOT more sleep.

 

[SupraDOHC]

I get quite a lot of blow-by and my best guess to what is causing it is my bad valve stem seals on my exhaust side. I get 180+ psi on all cylinders and I still burn about a quart of oil every 1500 miles(mobil 1 syn). I'm gonna take a look inside my exhaust cam tower tommorrow and maybe try and fit an intake cam cover on it and maybe run it to check if blow-by comes out and if so how much.

 

[Joseph]

now I will but a in a catch can. NOt sure how they work or how the hoses run.. yet

The air going through the PCV hoses and back into your intake has oil vapor and moisture in it which over time builds up in your PCV hoses/fittings, intake manifold, throttle body, etc.. The idea behind the catch can is to take whatever PCV hose(s) you have running back into your intake and connect them to the catch can. Then have another hose from the catch can going back to the intake. That way the oil/moisture/blow-by crud gets caught in the catch can and the air leaving it is cleaner.

Summitracing.com is good source for inexpensive catch cans, although you'll probably have to add a second fitting like I'm doing with the Moroso can I got from them for about $25. The Greddy CC is sweet but it's also $100!

HTH

 

[MAD_83supra]

Ok gays ,. its been a long day,.. ( YEAH! MARLINS!)

I washed the engine bay down with a gallon Mineral spirits and my compessed air spayer /siphon feeder.. then garden hosed it . then simple green.. and more garden hose.. -compressed air to blow all the water from the spark plug galley then i drove i t around the city for a hour.

NO leaks !! none.. but this is how is happens.. when i take the car on the highway, at a 4 to 5 k on the tach for 4 hours .. thats when i get all the oil flying off the cam belt.


so, I am off to get a good catch can, but why dont i see a drain plug or petcock on the bottem of the GReedy.. what happens when it fills up?

I will probably for now, vent the catch can to a filter breather (the one i am using now). as long as its high in the engine bay.. no more oil has come out of it either.. just stinks at stop lights.

Monday is highway day.. hopefully this fixes the oil gushing eruptions.

 

[MAD_83supra]

Update:My leaks have been greatly reduced since I "T"'d a hose and filter off of the large hose that vents the crank to the cam tower. I bought a Greddy catch can and it on the way.

I still have a small leak comming from the crank seal. But it is liveable.Before the venting I would blow a 1/2 quart of oil out in a tank of gas.
I have the plastic cam cover off and now I get a line across the underneath of the hood of oil which I just wipe down everyday after a long drive.(twice yesterday, It was a 500 mile day)

 

[SupraFiend]

whats the milage on your motor? Part of your problem may be that your oil seals have worn grooves in your journals. If you have new seals and new rings you really shouldn't have much for blowby. Most blowby that you get in the case is from rings. If your valves don't seat perfectly most of the blowby from that will end up in your intake and exhaust ports, some will get past your valve stem seals but usually its the blowby from the rings that is most significant.

Catch cans can be done very simply and cheaply. The gehtto solution, which is what I did for the time being with my wifes corolla, is an oceanspray bottte with two hoses plumed into it. Works great, its clear so I can see how much is in it and I can pull it out and empty it whenever I want. Another cheap solution, but much better looking, is to make a canister from PVC pipes. Cheap and simple to do and looks much better. Its just a bit of pita to check the level, you have to take the top off or just run a clear line from top to bottom of the can so you can see what its at.

 

[DKJones96]

Also, I don't think the 5M has any direct open connection(s) between the cylinder head and the block to allow for passage of blow-by gases up into the cylinder head area, except for that one single large hose that connects the crankcase to the intake cam tower on the cylinder head. Venting the exhaust side of the cylinder head sounds like a good idea, but please correct me if I'm wrong: I don't think there is a passageway for blow-by gases to enter into the exhaust side cam tower? :?:

no there is nothing taking blowby to the exhaust side.

if your getting that much blowby that your pcv system can't handle it you need some engine work. and these engines DONT have a pcv valve they have a single orifice. your orifice might be clogged. are you sure it's from the crank seal? there are 4 seals up front there. oil pump is right above the crank so maybe your oil pump is leaking?

 

[ddd228]

crankcase pcv vent hose-no catch can

Tee a hose into the crankcase/valvecover hose and run it to the back of the car? Into the air filter opening?Old school draft tube right onto the street? Stuffit into the vapor cannister?Dump it into the cat?:crossjerk

 

[Chrisfrom1986]

Dave, this thread is over 3 years old...

 

[ddd228]

I dug around and didn't find what I wanted so I posted again.There is a lot of confusing info about this. Oil lines? Pcv VALVES?