122S head gasket

[niveketak]

Originally Posted by Clan

perhaps the water pump impeller has rusted away , well worth getting the pump off to examine first , easy to put back with a gasket and a few rubber rings .

Thanks for that will take it off tomorrow and have a look.

[c1800]

If you are going to change the water pump while you’re in there, you want the OEM style with the cast impeller. The after market ones have an impeller stamped from sheet metal. The cast impeller provides better circulation at idle to keep the temps down while stuck in traffic on warm days.

Also a good idea to flush the block with a garden hose through the thermostat hole in the head and remove the draincock on the side of the block near the oil filter and blow compressed air in there while flushing.

[niveketak]

Well I took the water pump off and it is fine, very clean and all apparently working well. So I decided to take the head off and found bubbles of water in the rearmost exhaust port which would seem to indicate the head gasket had been leaking and would account for the steam from the exhaust after I had topped up the water when it had cooled down and restarted. Just need to check for warping, no cracking that i can see so fingers crossed. Will change the waterpump and both of the metal water pipes as they are pretty cruddy inside.

[Clan]

Originally Posted by niveketak

Well I took the water pump off and it is fine, very clean and all apparently working well. So I decided to take the head off and found bubbles of water in the rearmost exhaust port which would seem to indicate the head gasket had been leaking and would account for the steam from the exhaust after I had topped up the water when it had cooled down and restarted. Just need to check for warping, no cracking that i can see so fingers crossed. Will change the waterpump and both of the metal water pipes as they are pretty cruddy inside.

can you see any signs of breakage of the head gasket? Use a magnifying glass . Also any scorch marks on the head or block where the combustion gas is leaking out ? Yes get the head checked for flatness with a certified Straight edge .

[niveketak]

Not had chance as yet to do a really close look will have to wait till the morning as am out this afternoon.

[blueosprey90]

I'm no expert on these engines, but I would think that with a bad head gasket you would get water in the cylinder, not in the port. So I would be concerned with a cracked head.

[Ron Kwas]

niveketak;

Following with interest...I'd recommend removing Exhaust Valves (at least for #4) and checking for cracks...and as others have noted...our Cyl Heads are quite strong...I had a Cooling Sys leak on an acquaintance's car leak out and overheat the head to the point of browning the paint, and melting a piston, but everything remained straight as an arrow...no machining required...

Good Hunting!

[kishor]

Originally Posted by niveketak

After my thermostat stuck and Ruby boiled I have changed the thermostat but she still boils when driven slowly so I suspect the head gasket has gone. I am taking the engine out as the sump gasket needs changing so will buy a gasket kit.
Anybody changed the head gasket, any issues with the change.

Hi

It's most likely a dirty radiator than the gasket as these don't usually blow gaskets that easily. Flush out the radiator and this should keep the temp down

Ta
Kassie

[Clan]

Originally Posted by Ron Kwas

niveketak;

Following with interest...I'd recommend removing Exhaust Valves (at least for #4) and checking for cracks...and as others have noted...our Cyl Heads are quite strong...I had a Cooling Sys leak on an acquaintance's car leak out and overheat the head to the point of browning the paint, and melting a piston, but everything remained straight as an arrow...no machining required...

Good Hunting!

Thats what I found when working on them in the 70's ..