Coolant Pressure Test
#11
11-30-2017, 10:19 AM
To answer you initial question, you could pressure test without the system being full you would just have to pump in more air.
Someone correct me if I'm wrong, but I didn't think the valley pan gasket actually sealed any coolant passages. Aren't all of those sealed by the HG? Shouldn't it just be limiting oil spray from the push rods and tappets?
I'd check what shavechevelle said, the coolant elbow into the lower manifold could be leaking and running down to the rear of the valley pan.
Someone correct me if I'm wrong, but I didn't think the valley pan gasket actually sealed any coolant passages. Aren't all of those sealed by the HG? Shouldn't it just be limiting oil spray from the push rods and tappets?
I'd check what shavechevelle said, the coolant elbow into the lower manifold could be leaking and running down to the rear of the valley pan.
Yes, the valley pan gasket DOES seal coolant passages.
That gasket not only keeps the oil in the lifter valley, but also seals the lower intake to the heads on each side.
It seals the air/fuel runners of the intake to the heads, as well as the coolant passages between the intake and heads.
Look closely and you will see the coolant passages in the heads. They are the smaller ports.
#12
11-30-2017, 10:29 AM
If the coolant hose elbow on the lower front was leaking, you would have coolant running down the timing cover.
Coolant could also run down the back of the block as well; but, it would have to be a substantional leak, and more noticeable at the front. Reason being, there are clamps on both the front and rear of the lower intake.
Coolant would have to run back over the top of the valley pan gasket(which would absorb a small amount of coolant in the process), then over the metal intake clamp, or seep between the clamp and valley pan gasket.
Would be very unlikely for a drip from the elbow to make it's way to the rear of the engine, without first running out the front, unless it was parked facing upward on an incline. But it would still drip out of the front once it was on level ground again.
Coolant could also run down the back of the block as well; but, it would have to be a substantional leak, and more noticeable at the front. Reason being, there are clamps on both the front and rear of the lower intake.
Coolant would have to run back over the top of the valley pan gasket(which would absorb a small amount of coolant in the process), then over the metal intake clamp, or seep between the clamp and valley pan gasket.
Would be very unlikely for a drip from the elbow to make it's way to the rear of the engine, without first running out the front, unless it was parked facing upward on an incline. But it would still drip out of the front once it was on level ground again.
#14
11-30-2017, 12:31 PM
Winching
Yes, the valley pan gasket DOES seal coolant passages.
That gasket not only keeps the oil in the lifter valley, but also seals the lower intake to the heads on each side.
It seals the air/fuel runners of the intake to the heads, as well as the coolant passages between the intake and heads.
Look closely and you will see the coolant passages in the heads. They are the smaller ports.
That gasket not only keeps the oil in the lifter valley, but also seals the lower intake to the heads on each side.
It seals the air/fuel runners of the intake to the heads, as well as the coolant passages between the intake and heads.
Look closely and you will see the coolant passages in the heads. They are the smaller ports.
#15
11-30-2017, 12:53 PM
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#18
11-30-2017, 01:27 PM
Valley gasket does have coolant passages thru it (I think).
You don't want the manifold to be freezing cold from cold air
coming into it.
And you don't want the manifold to be at a temperature differential
as compared to the head right?
This would cause expansion of the head getting hot
and the manifold might contract getting cold from the venturi
effect of air going into it.
and the net net will be movement of the metals on the valley gasket surface.
Not good.
So I am thinking they do have coolant going thru the manifold.
In fact they do!
Because the thermostat used to be attached to the Manifold.
And the coolant goes into the intake manifold.
Wow I would only use aviation permatex on the surfaces.
I think that is what I used on the Discovery 2 valley gasket.
You don't want the manifold to be freezing cold from cold air
coming into it.
And you don't want the manifold to be at a temperature differential
as compared to the head right?
This would cause expansion of the head getting hot
and the manifold might contract getting cold from the venturi
effect of air going into it.
and the net net will be movement of the metals on the valley gasket surface.
Not good.
So I am thinking they do have coolant going thru the manifold.
In fact they do!
Because the thermostat used to be attached to the Manifold.
And the coolant goes into the intake manifold.
Wow I would only use aviation permatex on the surfaces.
I think that is what I used on the Discovery 2 valley gasket.
#19
11-30-2017, 01:29 PM
My D1 had a leak at the back of the valley gasket and that had coolant just dripping under the valley gasket into the engine crankcase.
Probably munched some of my main bearings
In fact Robert, as you are saying the oil pressure is low - yep.
You might have gotten coolant into the crankcase and the mains
might be a bit slim.
I had a bit of a low end knock at idle on the 1997 D1
Probably munched some of my main bearings
In fact Robert, as you are saying the oil pressure is low - yep.
You might have gotten coolant into the crankcase and the mains
might be a bit slim.
I had a bit of a low end knock at idle on the 1997 D1
#20
11-30-2017, 02:22 PM
Valley gasket does have coolant passages thru it (I think).
You don't want the manifold to be freezing cold from cold air
coming into it.
And you don't want the manifold to be at a temperature differential
as compared to the head right?
This would cause expansion of the head getting hot
and the manifold might contract getting cold from the venturi
effect of air going into it.
and the net net will be movement of the metals on the valley gasket surface.
Not good.
So I am thinking they do have coolant going thru the manifold.
In fact they do!
Because the thermostat used to be attached to the Manifold.
And the coolant goes into the intake manifold.
Wow I would only use aviation permatex on the surfaces.
I think that is what I used on the Discovery 2 valley gasket.
You don't want the manifold to be freezing cold from cold air
coming into it.
And you don't want the manifold to be at a temperature differential
as compared to the head right?
This would cause expansion of the head getting hot
and the manifold might contract getting cold from the venturi
effect of air going into it.
and the net net will be movement of the metals on the valley gasket surface.
Not good.
So I am thinking they do have coolant going thru the manifold.
In fact they do!
Because the thermostat used to be attached to the Manifold.
And the coolant goes into the intake manifold.
Wow I would only use aviation permatex on the surfaces.
I think that is what I used on the Discovery 2 valley gasket.
An air leak between the manifold and head will suck air into the cylinder, lean out the air/fuel ratio, and will ruin the piston/cylinder(s) nearest the leak.
It can literally burn a hole in the top of a piston.