Jump to content
SAU Community

Recommended Posts

Hey Guys,

Dunno if this is the right section but here goes.

About 2000ks ago I did an engine bay paint and pretty up when I upgraded my Turbo, Injectors, clutch etc on my 33 gtst. Everything has been fine up until the last week or so (Or I should say I only noticed it a week or so ago) when I noticed oil droplets on the garage floor. Not heaps of oil but oil drops none the less.

Last night I went for an approx 70k drive so I thought I"d put some paper down and see if I could find the source of the leak when I got home.

I pulled into the garage and turned the car off and looked under it to find a droplet about the size of a twenty cent coin on the paper under the part where the gearbox attaches to the engine (The bellhousing?)

Now if had a look and a feel around the engine (albeit at night) and I cant seem to find the source of the leak. Its not the sump plug as I first thought it may have been when I first noticed spots and I am thinking that maybe when I painted the cam covers and put them back on it hasnt sealed properly and oil is somehow running down the back of the engine and to this spot. Is this possible?

Ive had 4 dyno runs in the last few months including a full day at the mechanics checking over all my work to make sure I put everything together ok and nothing was said so I figure this is a new leak.

Any ideas?

If its something major like a big end Id hear it wouldnt I?

This is a meticulously maintained car so it has got me baffled.

Ive added a pic to show where the oil drips from

100_8983.jpg

and others to show how clean I keep the bay (So i would notice a leak)

100_8734.jpg

100_8733.jpg

Link to comment
https://www.sau.com.au/forums/topic/288577-rb25-oil-leak/
Share on other sites

Ha ha...

It is a pain, its the seal where the gearbox shaft goes into the engine, not an expensive part , the one for my ute was 15$ from memory. but a pain to get at..

you'll now if ya clutch starts slipping cause its covered in oil...lol

Edited by doozooby
Link to comment
https://www.sau.com.au/forums/topic/288577-rb25-oil-leak/#findComment-4834453
Share on other sites

^^^ Good call there. And.........old Holden rear mains practically leak from birth but don't seem to do much by way of degrading the clutch performance. My old ute don't seem to care one way or the other at least. See how it goes, if it is rear main & has only just started it probably isn't a major issue. Buy drip tray from supercrap for garage floor.

Cheers GW

Link to comment
https://www.sau.com.au/forums/topic/288577-rb25-oil-leak/#findComment-4834683
Share on other sites

Thanks for the input guys.

Ill have a really good look over it this arvo to make sure it isnt leaking from the cam cover area.

By the sounds of it tho its the rear main.....shouldve just changed it when i did the clutch. Lesson learned

Link to comment
https://www.sau.com.au/forums/topic/288577-rb25-oil-leak/#findComment-4834710
Share on other sites

mine's sweating oil to the general sump area all around ... mechanic looked at it and it looks like the rocker cover gaskets / halfmoon seals need replacing and it seems pretty common on skylines. Check the rear of the rocker cover near the firewall ..

Link to comment
https://www.sau.com.au/forums/topic/288577-rb25-oil-leak/#findComment-4834754
Share on other sites

mine used to leak from the same spot too at the gearbox. i thought it was the rocker gasket so i got that cleaned and replaced. prob came back later and got it re-cleaned and tightened by another workshop and it's still back. I then had the car up on a hoist and the mech pointed out it could possibly be coming from the oil line from under the turbo to the block so when you drive turbulence disperses the oil around the back of the block making it look like its leaking from the rocker gasket. I have yet to get it fixed but it does make alot of sense.

Link to comment
https://www.sau.com.au/forums/topic/288577-rb25-oil-leak/#findComment-4835106
Share on other sites

Did you look at the cam covers at the rear? the half moon rubber seals at the back ALWAYS leak, check for oil down your block around the back and sides.

Well just had a good look over and under the car in the light and I "THINK" GT-RZ win the prize for this one. Just under the half moon on the passengers side is covered in fresh oil, cant see it but when I wiped my hand over it could feel it.

I went around and re-tightened all the cam cover screws and I was suprised that they were a little loose (Could tighten about a 1/4 turn) Maybe cause I put new gaskets and Half moons in when I did the mini rebuild they have now "seated" a bit???

are you sure its definetly motor oil??

Yeh man definately motor oil

Just to be cautious I have cleaned all the bell housing and as much of the block as I can reach and I will take it for a spin tonight and have another look after she gets really warm for any other leaks, but Im hopeing Ive found it so I dont have to take the Gearbox out again. That was a bitch to do without the "proper" tools.

Ill keep you guys posted on the results

Thanks for the help peeps.

Link to comment
https://www.sau.com.au/forums/topic/288577-rb25-oil-leak/#findComment-4835188
Share on other sites

mine's sweating oil to the general sump area all around ... mechanic looked at it and it looks like the rocker cover gaskets / halfmoon seals need replacing and it seems pretty common on skylines. Check the rear of the rocker cover near the firewall ..

Yep, mine leaks here too :)

are you sure its definetly motor oil??

mine drips oil from the same spot but its not motor oil (bit more redish)

think mine is coming from one of the power steering lines.

And here :bunny:

Edited by doozooby
Link to comment
https://www.sau.com.au/forums/topic/288577-rb25-oil-leak/#findComment-4835206
Share on other sites

Did you look at the cam covers at the rear? the half moon rubber seals at the back ALWAYS leak, check for oil down your block around the back and sides.

And here :)

mine used to leak from the same spot too at the gearbox. i thought it was the rocker gasket so i got that cleaned and replaced. prob came back later and got it re-cleaned and tightened by another workshop and it's still back. I then had the car up on a hoist and the mech pointed out it could possibly be coming from the oil line from under the turbo to the block so when you drive turbulence disperses the oil around the back of the block making it look like its leaking from the rocker gasket. I have yet to get it fixed but it does make alot of sense.

Not sure about here :bunny:

I just keep coming back here to see what a clean engine bay looks like.....

Edited by doozooby
Link to comment
https://www.sau.com.au/forums/topic/288577-rb25-oil-leak/#findComment-4835212
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • ok so if i wanted to go 18's i would go for 8's  in front 30+ or 32+ off set at front and the back 9 would be ok? what offset should i aim for.. then can i do some  hunting for wheel rim choices..    If i get this - will this fit all around: Size: 18 x 8.5 +37 - n what tyres size tyre should i get for front n back?  
    • Absolute f*cking nightmare. I had to take breaks constantly, and I was always pissed off when I got home. The line split in Italy on day 2 (we drove from the Netherlands), lol. Driving any narrow European town was... well, sh*t.   Appreciate it man. Here, I'll just drop a favourite from the load I took on Saturday.   I'll update here when things happen with the car, the thing is, with stock power and almost everything chassis-wise taken care of, there really are no problems. 268,000kms now and counting.  
    • Ah! I actually managed to snag a lightly used set.... that aren't so suitable for me right now. They don't work on a GTT without some cutting or creative heat moulding. I thought about reselling them myself cause I didn't want to murder them, but it looks like I'm probably going to attempt to murder them/melt them because I may as well. @GTSBoy @PranK can somebody close this thread?
    • Hey mate,  I have a set, one is slightly damaged but wont be noticable once installed.  Shoot me a message if your still after them 
    • I couldn't wait But, the black constant tension hose clamps were too thick and there wasn't enough clearance at the T/B and I couldn't get it to seat properly, so I had use a silver one there I also added some 3" silicone over the alloy bit that goes through to hole on the radiator support as it looked like it was sitting on the edge of the hole in the radiator support, I never noticed a rattle or anything, but there was a witness mark It is basicly done, and I can live with the silver hose clamp at the T/B, I will get a black clamp for the head vent though where it is attached to the bulkhead fitting  It never stops...LOL, only issue now with the shock tower brace is it slightly touches the under bonnet liner now, if I leave it it will either wear some paint off the brace where it touches, or damage the liner, so I removed the liner to see what I have to work with, with the liner removed I have about 20mm of clearance, but sadly the middle part of the underside of the bonnet is only dusted with paint and looks crap, so I cannot have that, but.... as I have a roll of Carbuilders premium under bonnet insulation in the garage laying around that is only 5.5mm thick (we were going to use it on the boys Patrol, but he crashed the front of it a few months and it was written off, hence why he now drives my old Honda Accord Euro), I'll use the OEM liner as a template and get the Carbuilders stuff fitted up to cover that dusted paint up
×
×
  • Create New...