I have chased all manner of oil leaks on this 1973 SIII E
type V12 engine over the years. Issues with the rear
crankcase seal, and camblock have all been resolved!! I now
have a leak underneath at the engine front involving the
Oil Cooler and Oil cleaner( filter ) and its NOT from the
oil filter can. Because of the location I have raised the
front of the car and after a clean up, I have watched the
drips forming as the engine runs!One of the short bolts
(firmly screwed in ) holding the oil cooler housing is
leaking oil ( its UCB.131/13R 9 off , parts manual oil
cooler 25.08 ) This bolt has a standard serrated washer
metal washer ( C.30075/2 ); and the rest of the housing
bolts are all tight! Also the stud holding the Oil cleaner
housing, 25.07 C.35683 ( also firmly seated ) drips in a
similar manner. Does anyone know whats happening.I think
this might require the removal of the whole oil cooler
housing to investigate, but this would involve draining all
the oil and coolant first!!–
John M Holmes 1973 E Type SIII Supra 5Sp, 70 SII OTS 05XJ8L
Ontario, Canada
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from John M Holmes sent Thu 2 Oct 2014:
Morning John,
Any chance it could be coming from the two ‘O’ rings on the
oil cleaner housing? Parts C29426 on plate 30.07? I’ve had to
replaces those things twice now. Hope this is what it is
because you can replace them with out changing the coolant.
Cheers,
Lynn–
The original message included these comments:
I have chased all manner of oil leaks on this 1973 SIII E
type V12 engine over the years. Issues with the rear
crankcase seal, and camblock have all been resolved!! I now
have a leak underneath at the engine front involving the
Oil Cooler and Oil cleaner( filter ) and its NOT from the
oil filter can. Because of the location I have raised the
front of the car and after a clean up, I have watched the
drips forming as the engine runs!One of the short bolts
(firmly screwed in ) holding the oil cooler housing is
leaking oil ( its UCB.131/13R 9 off , parts manual oil
cooler 25.08 ) This bolt has a standard serrated washer
–
Lynn G.
68/85 ots, 73 2+2, Boise, Id., United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from John M Holmes sent Thu 2 Oct 2014:
Hi John,
i guess its the o ring c29828 on 25.07 causing the stud to
leak, the bolt leak can only be bad gasket–
Dave S3E,RR SS, BMW’02,Tr4a,Elise, http://www.xketype.com
Georgetown, Penang, Malaysia
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from David Lacey sent Thu 2 Oct 2014:
There are a number of things that can cause this:-
1/ Overtightening a bolt into a blind hole means that the casting
at the top of the thread may now have a hairline crack in it. This
means that oil will seep down the thread as the topside above the
blind hole is underwater, so to speak.
2/ General fatigue over the years combined with the fact that the
aluminium casting is not homogenous means that it may have a
slightly porous patch which is again, soaked in oil on the other
side.
Dirty fixes are to use liquid gasket under a bolt or chemical metal
as a patch. If you strip it down and identify the cause, then a
blob weld of aluminium or low melt alloy is a better fix.
3/ Sometimes you can see hairline cracks from grounding damage.
The O-rings are generally pretty bullet proof. The internal ones
will actually manifest themselves as a loss of maximum oil pressure
as any leak is still inside the sump and will result in drawing air
from the sumnp rather than oil.
kind regards
Marek–
v12 E-type running MS3/3X sequential lpg and petrol
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from MarekH sent Thu 2 Oct 2014:
In case you are in doubt where the leak is or where the oils
is coming from, an old trick is to wipe everything clean and
dowse the area with talcum powder. The oil will leave a
trace and reveal the origin of the leak.–
Ole-XKE1974
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Ole-XKE1974 sent Fri 3 Oct 2014:
Well…thanks for all the input.While I thought that I had
cleaned things up well before my first inspection, I did NOT
see everything. The leak is now sorted, after finding that
the 2 bolts that hold the oil assembly to the oil cooler
housing has stripped the threads in the cast Aluminum. After
some careful measurements with a caliper, and allowing for 2
washers and the thickness of the new gasket I ascertained
that I needed one bolt at 97.06mm and another at 95’66mm (
both cut from new 4’’ NC bolts )in order to use the full
depth of threads in the casting. Both oe bolts were 90.64 mm
. I would have liked to helicoil these bolt holes, but that
must wait until the oil cooler housing is off the oil pan!–
The original message included these comments:
In case you are in doubt where the leak is or where the oils
is coming from, an old trick is to wipe everything clean and
dowse the area with talcum powder. The oil will leave a
trace and reveal the origin of the leak.
Ole-XKE1974
–
John M Holmes 1973 E Type SIII Supra 5Sp, 70 SII OTS 05XJ8L
Ontario, Canada
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from John M Holmes sent Fri 3 Oct 2014:
Well, After 2 hot/ cool cycles the bolts let go…not enough
threads in the Al casting to do the job. Now in the throws
of removing the oil cooler housing. Coolant and oil drained
out and cross over bar removed. Next to remove the many
bolts holding the housing on the bottom of the oil pan.I
will see how it is to helicoil the pan to recieve the oil
filter housing bolts . They must be under considerable
stress to pull out the threads. We shall see!?–
The original message included these comments:
. I would have liked to helicoil these bolt holes, but that
must wait until the oil cooler housing is off the oil pan!
–
John M Holmes 1973 E Type SIII Supra 5Sp, 70 SII OTS 05XJ8L
Ontario, Canada
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–