1JZ oil leak

[Halle Terry]

Ok,

So as you know, I've been fighting a yellow sticker for the past few months. Mostly I'm being knocked back by oil leaks. I'm now aiming for my 6th pass on Monday and I'm getting awfully close to figuring out what is causing me all this shit.

So far this has been done to prevent oil leaks. However I am finding oil still present on the bottom on the bell-housing.

Rear main seal, this was done by a reputable workshop and both themselves and I have double checked that it is NOT the rear main seal (I pulled off both left and right side inspection plates + inspection grommet on the sump, they checked it using a little camera)

Front main seal, this was done by myself and Tristan (ovaxitd) who we all know is a Toyo guru, there is no oil leaking on the front of the motor now (there was shit loads before)

Cam cover seal was ALSO done by said reputable workshop, as I found lots of oil being deposited within the spark plug valley.

So far I've narrowed it down to the possibly somewhere on the head as I've found lots of oil that's been combined with sand etc on the back of the motor. The coilpack cover is not closed off on the end, so what I think I've figured out is the oil is being deposited in the spark plug valley (all plugs are all sitting in oil at the moment) and making its way backwards out of the valley onto the back of the motor and eventually onto the bellhousing and making its way down.

Now my question is to you guys is, what is causing the oil to be deposited there?

[Risk10k]

Plugs in oil?? Just the rocker cover seal

[Lump]

cam cover seals?

[upgarage]

gearbox leak?

input shaft seal or gasket for plate

[Halle Terry]

cam cover seals?


Plugs in oil?? Just the rocker cover seal

Done that, and supposedly the guys said they used a fuckload of sealant on it as 1J's have a habit of weaping from there.


gearbox leak?

input shaft seal or gasket for plate

Oil is dark in colour and the gearbox fluid is clear, there was a minor leak but it was because the filler point was loose.

[Skitzo]

Buy a nissan.

[Risk10k]

Have you degreased the block as best you can to locate the leak?

Hows your PCV? Do you have a catch can setup? Do you have a dirty ass impeller?

[Lump]

Done that, and supposedly the guys said they used a fuckload of sealant on it as 1J's have a habit of weaping from there.

.
shouldnt need any sealant at all if the gasket is new (which it definately should be) for an oil tight seal.
I use a little sealant just to hold the gasket inside the cover for ease of installation.
did they use a a brand new gasket???

[Halle Terry]

shouldnt need any sealant at all if the gasket is new (which it definately should be) for an oil tight seal.
I use a little sealant just to hold the gasket inside the cover for ease of installation.
did they use a a brand new gasket???

Yeah they did, it was an unopened one from Toyota I ordered, so defiantly an OEM item.


Have you degreased the block as best you can to locate the leak?

Hows your PCV? Do you have a catch can setup? Do you have a dirty ass impeller?

No to a catch can setup, but that might be worth while looking into. I'm about to mash the back of the car with degreaser, I've hit the underside a bunch of times but it didn't really tell me much, maybe hitting it from the top is the best method.

I hate to sound like an idiot, but what's a PCV? And what's an impeller?

[Lump]

pcv = positive crankcase ventilation valve (fitted to rocker cover & breather line)
impeller - turbo inlet wheel

sounds like dodgey mechs that use a heap of sealant on a new rocker gasket imo

[Risk10k]

I hate to sound like an idiot, but what's a PCV? And what's an impeller?

Positive Crankcase Ventilation, its a valve so PCV Valve

I DID see this on wikipedia!


The early generation 1JZ-GTEs combined the inherent smoothness of an inline 6 cylinder engine with the revving capacity of its short stroke and early power delivery of its small, ceramic wheeled turbochargers. The ceramic turbine wheels are prone to delamination in the setting of high impeller rpm and local temperature conditions, usually a result of higher boost. The first generation 1JZ's were even more prone to turbo failure due to there being a faulty one-way valve on the head, specifically on the intake cam cover causing blow-by to go into the intake manifold. Also on the exhaust side a decent amount of oil vapor flows into the turbos causing premature wear on the seals. The later 2nd Gens had this problem fixed and in Japan there was actually a recall in order to repair the 1st Gens, though that does not apply to 1JZ's imported to other countries. The fix is simple, and involves replacement of the PCV valve (2JZ); all parts are available through Toyota.



Impeller is just your turbo wheel, if its dirty as shit you will more than likely need a catch can and looking into other causes.

[Alt_F4]

Check for split pipes or loose hose clamps on your breather pipes around your head.
It doesn't take much of a split to make a mess.

[upgarage]

Oil is dark in colour and the gearbox fluid is clear, there was a minor leak but it was because the filler point was loose.

and....?

clear gbox oil + dust inside bellhousing (from clutch) = dark oil

[Skitzo]

Positive Crankcase Ventilation, its a valve so PCV Valve

I DID see this on wikipedia!



Cheers for that, may be something i should look into when i eventually up the boost on mine.

[Halle Terry]

and....?

clear gbox oil + dust inside bellhousing (from clutch) = dark oil

I'm just fairly certain that it's not the gearbox. I pulled apart the gearbox a last year and made sure I reassembled it with lots of gasket shit etc. That and the inside of the bell-housing is pretty clean. The gearbox has been cleaned and from looking from the top down, I can see it's already collected heaps of grit on the top of the gearbox already.


Positive Crankcase Ventilation, its a valve so PCV Valve

I DID see this on wikipedia!



Impeller is just your turbo wheel, if its dirty as shit you will more than likely need a catch can and looking into other causes.

I just checked my PCV valve, I'm assuming you mean the little pipe that's connected to the exhaust side cam cover? And feeds into the inlet for the turbo?

There's a little bits of oil on the join on the turbo side. That said, surely a leak there is not causing the huge leak into the rocker cover right?

[Halle Terry]

Also, easiest way to check the impeller?

[mitchy]

surely cleaning everything would be the easiest way to find where the oil is originating from?
there cant be too many places to leak from that would deposit oil on the top of the engine.

[stumps.]

You would be surprised how much can leak from a faulty pcv or vacuum hose. Also if the pcv is faulty the crankcase can become pressurised which will push oil out of your seals.

[Lump]

Also, easiest way to check the impeller?
remove air intake to turbo & have a look, check shaft play while your there!

excessive blowby will cause oil leaks too

[cplagz]

Do you have half moon seals in your head?

they fit in here
http://i118.photobucket.com/albums/o96/yuepeng05/cams%20install/Picture021.jpg

I had a similar leak and that's what it was (albeit a BMW motor) but same thing... leaking down back of head/block and into bellhousing.

Got new seals ($3 ea) and some Permatex Blue... problem solvered. If you not done them - get some and swing over to my place and ill give you the PB sealant, I got a whole tube.

[mxracer]

i have a spare vvti 1jz here with no leaks .. $800 and its yours .. im sure u have spent more time and effort looking for the leaks , than replacing the whole motor !!

start by cleaning(pressure washing ) the whole motor down .. get under it and spray the fu%K out of it , justcover your intake/ alarm if u have one and degrease it best u can .. then you shold be able to see where exactly the leak is coming from .. by sounds of it , your beating around the bush atm

[S_E]

Rocker cover bolts tight? I had the heaps of oil in the valley thing, found the bolts that the coil cover, er, covers were loose, mine may have had rocker cover gaskets 10k before that, but not 100%.

[mxracer]

Buy a nissan.

at least a toyota still runs , even if its bleeding a bit of oil

[ovaxitd]

DEGREASE your fuckin engine gook. Told u too do it or bring it to me with money for degreaser and 4pack of jacks and I'll do it for ya.

Your chaser is the dirtiest one I know of. If u had of done it earlier u wouldnt be in this position. Bring it to workshop after 930 tomorrow clown.

[SK]

oil in spark plug tubes would indicate a rocker cover gasket to me but cant confirm on the internet lol

[eScoRt20]

DEGREASE your fuckin engine gook. Told u too do it or bring it to me with money for degreaser and 4pack of jacks and I'll do it for ya.

Your chaser is the dirtiest one I know of. If u had of done it earlier u wouldnt be in this position. Bring it to workshop after 930 tomorrow clown.

Tristan is always at the shop from 6:30am onwards. arrive then, and if he is not there, just keep calling his mobile, as he will be around the corner trying to break into bottle shop. he will lie to you at this point in time, and try to tell you he isnt at the shop. dont beleive him. keep pestering him until he gives up trying to break into the bottleshop.

[Halle Terry]

Hahahahaha, Tristan's rage makes me happy.

[gav]

This thread makes me LOL

[KyeBidz]

I thought asians were supposed to be smart...

[mitchy]

http://images1.memegenerator.net/ImageMacro/3928996/Iz-like-TimLees-dumb-brother.jpg

[BIGS]

There are too many so called 'reputable' work shops, sounds like a recheck is needed of their job.

[peaknwa]

rocker cover bolt will come loose after a while once you have done a new gasket i check mine all the time and get a bit of turn on them most of the time. My guess rocker cover leak and if it is gearbox you can smell the different in gear oil and engine oil.