[supra mkiv]

I still have problems with my front main seal, i have purchased an original front main seal in from my local Toyota dealer. but it still leaking. when the car just sits at idle, so is it close, you can also keep the engine revs around 4000th and it is still close. but as soon as I drive the car and it gets a little boost pressure, then the leak begins .. have checked for crank walk and there is nothing. have also checked the PCV and no problem with taht. did a compression test before the engine was put in the car. and ranged from 10 to 11 on all cylinders ..

so need some advice where I now must search ..

 

[Kracin]

how was the seating surface when you installed it, any pics of before and after the install? how are you installing it? when you pull it out is the little spring still inside the seal or did it fall out on installation? have you tried connecting a gauge up to your crank ventilation to see if you are getting an excessive amount of pressure while driving and boosting? what brand seal are you buying?

 

[supra mkiv]

how was the seating surface when you installed it, any pics of before and after the install? how are you installing it? when you pull it out is the little spring still inside the seal or did it fall out on installation? have you tried connecting a gauge up to your crank ventilation to see if you are getting an excessive amount of pressure while driving and boosting? what brand seal are you buying?

from what I can see, there is no visible damage on either the crankshaft or the oil pump, where it should sit it is cleaned, and i have put in some fluently pack on the seal before it was pushed into the oil pump and it flush with oil pump housing, and the spring is still on the seal when i removed it. i have not tried to connect i gauge to the ventilation. how do i do that? it is a oem seal from my toyta dealer.

 

[Kruso]

Need more info on your setup. Is this a NA-t? or an original TT? Mods? We've had the same problem with the TT front oil pump on a NA block, too much oil pressure (due to no oil squirters on the NA block) causes the front main seal to leak out.

Kruso

 

[supra mkiv]

Need more info on your setup. Is this a NA-t? or an original TT? Mods? We've had the same problem with the TT front oil pump on a NA block, too much oil pressure (due to no oil squirters on the NA block) causes the front main seal to leak out.

Kruso

sorry it is a supra tt 1993 2jzgte

 

[Kruso]

By any chance do you have the part number off of your front main seal? Any chances of the seal having gotten damaged during installation?

 

[supra mkiv]

By any chance do you have the part number off of your front main seal? Any chances of the seal having gotten damaged during installation?

i dont hope so, cant see how i can be damaged under installation. no i do not have the part number. it is just leaking when i drive the car.. at idle and revs. it is not leaking at all..

 

[Kracin]

By any chance do you have the part number off of your front main seal? Any chances of the seal having gotten damaged during installation?

this, i can't think of much else with it being a stockish tt gte.... using a toyota seal, and having no damage to the surrounding seat. while packing the seal so it doesnt lose the spring.


there is not a lot else that will cause this thing to leak like that.

you are absolutely certain it is the front main seal leaking and not something else ???



aside from everything else, the only thing i can think is the seal is going in crooked and getting a flat spot and not seating on the side, or you may need to inspect the surfaces better... by some emry paper and remove any burrs or anything that could be causing an adverse effect on the seal


how are you installing it??? hopefully not a screwdriver and hammer

 

[supra mkiv]

this, i can't think of much else with it being a stockish tt gte.... using a toyota seal, and having no damage to the surrounding seat. while packing the seal so it doesnt lose the spring.


there is not a lot else that will cause this thing to leak like that.

you are absolutely certain it is the front main seal leaking and not something else ???



aside from everything else, the only thing i can think is the seal is going in crooked and getting a flat spot and not seating on the side, or you may need to inspect the surfaces better... by some emry paper and remove any burrs or anything that could be causing an adverse effect on the seal


how are you installing it??? hopefully not a screwdriver and hammer

no, I press it in with my fingers, so it is flush with oil pump house. I have not begun to remove anything yet, but strongly based on coming from down there
. because everything else was dry when I switched it

 

[Kracin]

no, I press it in with my fingers, so it is flush with oil pump house. I have not begun to remove anything yet, but strongly based on coming from down there
. because everything else was dry when I switched it

pressing an oil seal in with your fingers seems to be a real loose fit..... typically you have to tap in seals of that type in just a little..

 

[supra mkiv]

pressing an oil seal in with your fingers seems to be a real loose fit..... typically you have to tap in seals of that type in just a little..

I'm not sure I know what you mean, can you explain it a little closer

 

[choua01]

I'm not sure I know what you mean, can you explain it a little closer

he was saying that putting the seal back in with you finger indicated that the seal is too loose. Normally you should not be able to put the seal in with your fingers, there should have been some resistance.

 

[supraman74GTS]

pressing an oil seal in with your fingers seems to be a real loose fit..... typically you have to tap in seals of that type in just a little..

I had the same problem with the front main, but im single turbo and 115k miles on the car... sounds like its just the seal fittment to me (since you dont have an oil pressure guage the block pressure is unknown when the turbos spool... Id say ditch the seal you have and try again with a new one at the least, its not expensive... then what i did was freeze mine to help shrink it and used way more pressure than finger tight to install it....

if this continues to be a problem it could be the oil pump (if your still factory TT and stock, it shouldn't be a problem) but Power house racing does modify the pump to compensate for too much pressure...

 

[supra mkiv]

I have now tried to leave the car a few minutes at 2000 3000 4000 rpm without coming any oil out of fms .. so can it still be my problem otherwise the problem lies elsewhere?

has it no effect on the engine when it throw a little oil out while driving?
I am thinking of oil pressure - engine wear - bearings. So, I risked my engine break?

 

[RikTT]

Having not the right amount of oil in ANY engine's rotating assembly risks starvation and engine failure (oil pump, bearings etc) So yes to your question - damage, when oil is being lost under load.

Assuming this is still FMS realted, this is what I did when I replaced my FMS (OEM):
Grab another new one - the area for front main seal should be thorougly clean & making sure you do not nick or damage that area of the oil pump when removing the old FMS.

Get a piece of PVC pipe with the same size circumference as the FMS (I think 2 1/4" ?) and tap it in evenly after you placed it in by hand. Make sure the PVC pipe area is a flush cut piece and tap the seal to sit FLUSH with the housing.
Mine has held up well and has been exposed to substantially more power after a tunning session. Porper crankcase pressure ventilation helps

I do believe that after a few seal changes, that area may widen a tad, not noticeable to the naked eye, making it problematic and in line for a new oil pump. Basically buying time on a few seal changes.

 

[supra mkiv]

Having not the right amount of oil in ANY engine's rotating assembly risks starvation and engine failure (oil pump, bearings etc) So yes to your question - damage, when oil is being lost under load.

Assuming this is still FMS realted, this is what I did when I replaced my FMS (OEM):
Grab another new one - the area for front main seal should be thorougly clean & making sure you do not nick or damage that area of the oil pump when removing the old FMS.

Get a piece of PVC pipe with the same size circumference as the FMS (I think 2 1/4" ?) and tap it in evenly after you placed it in by hand. Make sure the PVC pipe area is a flush cut piece and tap the seal to sit FLUSH with the housing.
Mine has held up well and has been exposed to substantially more power after a tunning session. Porper crankcase pressure ventilation helps

I do believe that after a few seal changes, that area may widen a tad, not noticeable to the naked eye, making it problematic and in line for a new oil pump. Basically buying time on a few seal changes.

the pressure that may be behind the front main seal. has it something to do with the engine oil pressure? i have a atermarket oil pressure gauge indstall and can see there is good oil pressure on the engine cold as warm about 8.5 bar at idle cold and hot 3 bar at idle. it is not much it throws, after i have drived the car, there is no oil on the floor, there is little drops of oil pan..

i think the oil pump has drivede 135000 km.. bu cant it already be worn???

 

[93 twintrbo]

If you put some sealant on the outside surface of the seal, that is why it slid in by hand. The sealant makes the seals "slide" into place, but that makes them prone to leaking. There is a oil drainback hole to the pan just behind the front main seal seating surface. Its possible that drain hole is clogged? I always install front main seals "dry" with no silicone at all. Just clean bothe the oil pump and outside of the seal with brakeclean and tap it into place with a large socket. Never had one leak in 10+ fms that I have done.

 

[supra mkiv]

If you put some sealant on the outside surface of the seal, that is why it slid in by hand. The sealant makes the seals "slide" into place, but that makes them prone to leaking. There is a oil drainback hole to the pan just behind the front main seal seating surface. Its possible that drain hole is clogged? I always install front main seals "dry" with no silicone at all. Just clean bothe the oil pump and outside of the seal with brakeclean and tap it into place with a large socket. Never had one leak in 10+ fms that I have done.

I've done both seal + oil pump clean before installing the new seal, with thinner. so it should remove all dirt. On the new seal i put liquid gasket around, hoping it could hold the seal in place and help not to leak, certain there should be some scratches on the oil pump side

 

[Alpine2JZ]

I had this same problem a few years ago, I noticed that new seals didn't fit in as snug as they should and I would blow a seal every month. I replaced the oil pump with a new one and problem solved, I could even feel the difference when comparing the new and old seal seat.

Jordan

 

[cwtt]

I had this same problem a few years ago, I noticed that new seals didn't fit in as snug as they should and I would blow a seal every month. I replaced the oil pump with a new one and problem solved, I could even feel the difference when comparing the new and old seal seat.

Jordan

Wow, that is very interesting... Thanks for the video.