www.gt4dc.co.uk
Maintain, Modify and DRIVE your GT-Four


It is currently Thu Mar 28, 2024 3:55 pm




Post new topic Reply to topic  [ 12 posts ] 
Author Message
PostPosted: Mon Aug 26, 2013 4:49 pm 
Offline
Group B
User avatar

Joined: Sat Sep 02, 2006 3:13 pm
Posts: 3679
Location: Bournemouth
Car Model: None
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

_________________
If at first you don't suck seed, try drier grain.

Image


Top
 Profile  
 
PostPosted: Mon Aug 26, 2013 8:34 pm 
Offline
Club Staff
User avatar

Joined: Wed Jul 13, 2005 12:14 am
Posts: 3265
Location: Camberley, Surrey
Car Model: ST205
Chris - thank you very much for this!

Correct me if I am wrong, but basically - I don't need to take the car apart?

_________________
GT4DC Events Co-ordinator
1996 ST205 UK


Top
 Profile  
 
PostPosted: Mon Aug 26, 2013 8:56 pm 
Offline
Group B
User avatar

Joined: Sat Sep 02, 2006 3:13 pm
Posts: 3679
Location: Bournemouth
Car Model: None
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.

_________________
If at first you don't suck seed, try drier grain.

Image


Top
 Profile  
 
PostPosted: Mon Aug 26, 2013 10:45 pm 
Offline
Club Staff
User avatar

Joined: Wed Jul 13, 2005 12:06 am
Posts: 4743
Location: Perth, Western Australia
Car Model: ST205
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.

_________________
Don
GT4DC Chairman
1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp


Top
 Profile  
 
PostPosted: Tue Aug 27, 2013 10:59 pm 
Offline
Group N

Joined: Tue May 01, 2007 9:21 pm
Posts: 212
Location: lancashire
Car Model: None
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

_________________
We now have a new website

https://www.mkautorepairsandtuning.uk/

http://www.facebook.com/pages/Mk-Auto-R ... 7894641634

Image


Top
 Profile  
 
PostPosted: Wed Aug 28, 2013 11:16 am 
Offline
Club Staff
User avatar

Joined: Wed Jul 13, 2005 12:14 am
Posts: 3265
Location: Camberley, Surrey
Car Model: ST205
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.

_________________
GT4DC Events Co-ordinator
1996 ST205 UK


Top
 Profile  
 
PostPosted: Wed Aug 28, 2013 8:43 pm 
Offline
Group N

Joined: Tue May 01, 2007 9:21 pm
Posts: 212
Location: lancashire
Car Model: None
Aaahh bollocks another curry without me lol

Martin

_________________
We now have a new website

https://www.mkautorepairsandtuning.uk/

http://www.facebook.com/pages/Mk-Auto-R ... 7894641634

Image


Top
 Profile  
 
PostPosted: Wed Aug 28, 2013 10:41 pm 
Offline
Club Staff
User avatar

Joined: Wed Jul 13, 2005 12:06 am
Posts: 4743
Location: Perth, Western Australia
Car Model: ST205
If you're ever 'darn sarf' Martin I'm sure you would be the guest of honour at our local curry house!

_________________
Don
GT4DC Chairman
1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp


Top
 Profile  
 
PostPosted: Wed Aug 28, 2013 11:44 pm 
Offline
Club Staff
User avatar

Joined: Wed Jul 13, 2005 12:14 am
Posts: 3265
Location: Camberley, Surrey
Car Model: ST205
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!!

_________________
GT4DC Events Co-ordinator
1996 ST205 UK


Top
 Profile  
 
PostPosted: Wed Aug 28, 2013 11:47 pm 
Offline
Club Staff
User avatar

Joined: Wed Jul 13, 2005 12:06 am
Posts: 4743
Location: Perth, Western Australia
Car Model: ST205
Hmm, jungle beast Atom has his moments, as Claire discovered!

_________________
Don
GT4DC Chairman
1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp


Top
 Profile  
 
PostPosted: Thu Aug 29, 2013 12:06 am 
Offline
Group N

Joined: Tue May 01, 2007 9:21 pm
Posts: 212
Location: lancashire
Car Model: None
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

_________________
We now have a new website

https://www.mkautorepairsandtuning.uk/

http://www.facebook.com/pages/Mk-Auto-R ... 7894641634

Image


Top
 Profile  
 
PostPosted: Thu Aug 29, 2013 6:49 pm 
Offline
Club Staff
User avatar

Joined: Mon Mar 26, 2007 5:53 pm
Posts: 1736
Location: Another Shire County
Car Model: ST185
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

_________________
Vice Chairman
1990 White UK Celica ST185 - Project DTM
1997 Cream BMW R1200C (as seen in James Bond "Tomorrow Never Dies")
2005 Jaguar X-type 3.0 Sovereign AWD Automatic
Blood Bikes - https://www.freewheelers.org.uk/


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 12 posts ] 


Who is online

Users browsing this forum: No registered users and 21 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group