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Oil return from behind the cam oil seals.
http://www.gt4dc.co.uk/forum/viewtopic.php?f=13&t=6711		 Page 1 of 1
Author:  Nibbles [ Mon Aug 26, 2013 4:49 pm ]
Post subject:  Oil return from behind the cam oil seals.
Following recent discussions, the picture below shows the return path for oil from the front cam bearing.

Also, there is no chamfer on the holes for the dowel pegs on the front bearing cap or head, so no path along the channel in question. I would hazzard a guess it's there as an escape for excess sealant in the same way as those on the sump pan.

edit - having just done the oil pump on the MR2 engine, there is a similar channel round the pressurised parts returning back to the intake. I suspect it forms a double seal in that any seepage under pressure will escape at the channel leaving a second seal to the outside world that will not be under pressure.

Image
Author:  Sirius [ Mon Aug 26, 2013 8:34 pm ]
Post subject:  Re: Oil return from behind the cam oil seals.
Chris - thank you very much for this!

Correct me if I am wrong, but basically - I don't need to take the car apart?
Author:  Nibbles [ Mon Aug 26, 2013 8:56 pm ]
Post subject:  Re: Oil return from behind the cam oil seals.
Correct.

For future reference it is probably better to keep sealant away from the channel as it reduces the liklehood of leaks as above - it means the last part of the joint to the outside world has very little pressure across it. I notice they also have a similar channel on the sump / oil pump between the high pressure ports down to the filter and the 'gasket' area.

Out of interest, I've never put sealant on the front journals and never had a leak from them so I guess the theory works.
Author:  TrackToyFour [ Mon Aug 26, 2013 10:45 pm ]
Post subject:  Re: Oil return from behind the cam oil seals.
After Friday night's discussion I closely examined the cam and the bearing caps. The doweled bearing cap is cross drilled into the stud orifices. Combined with the other 'pressure relief holes' I get the impression that Toyota went to considerable lengths to protect the cam seal by venting pressure wherever possible into the top of the cylinder.
Author:  martinking6 [ Tue Aug 27, 2013 10:59 pm ]
Post subject:  Re: Oil return from behind the cam oil seals.
I simply put a very thin smear on the mating face of the cap, its so slight that you can hardly tell theres any on it, the face fit will seal it but ~I use the sealant just incase of any face discrepancies, the channels ive always suspected as somewhere for the oil to run back from the seal

Whos told you that you need to take it back apart mike ? Worse case scenario is an oil leak from cam seal ive seen some seriously splodged with sealant in the past dont worry about it mike

Martin
Author:  Sirius [ Wed Aug 28, 2013 11:16 am ]
Post subject:  Re: Oil return from behind the cam oil seals.
Hi Martin,

No one said to take it back apart, that's just what I was expecting we would have to do before Chris had looked at a head for me. It was just discussions over a curry on Friday night.

I will leave well alone. :)

Cheers.
Author:  martinking6 [ Wed Aug 28, 2013 8:43 pm ]
Post subject:  Re: Oil return from behind the cam oil seals.
Aaahh bollocks another curry without me lol

Martin
Author:  TrackToyFour [ Wed Aug 28, 2013 10:41 pm ]
Post subject:  Re: Oil return from behind the cam oil seals.
If you're ever 'darn sarf' Martin I'm sure you would be the guest of honour at our local curry house!
Author:  Sirius [ Wed Aug 28, 2013 11:44 pm ]
Post subject:  Re: Oil return from behind the cam oil seals.
Yep and you'd be welcome to have to stay at mine, although I don't have a menagerie of pets only a cat:

Image

Not as scary as an 8ft snake!!
Author:  TrackToyFour [ Wed Aug 28, 2013 11:47 pm ]
Post subject:  Re: Oil return from behind the cam oil seals.
Hmm, jungle beast Atom has his moments, as Claire discovered!
Author:  martinking6 [ Thu Aug 29, 2013 12:06 am ]
Post subject:  Re: Oil return from behind the cam oil seals.
Angel is now heading towards 12ft her growth rate is unbelievable lol

The night over sounds like a plan, I will deffo take you up on this some time :-)

Martin
Author:  Muddy Water [ Thu Aug 29, 2013 6:49 pm ]
Post subject:  Re: Oil return from behind the cam oil seals.
TrackToyFour wrote:
If you're ever 'darn sarf' Martin I'm sure you would be the guest of honour at our local curry house!

+1
Would be good to see you...it's been a while
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