NorthofSixty
Member
Both plugs appear to have antifreeze on them. It currently runs fine and not over heating or blowing the antifreeze out of the cooling system. Given that it has a belt driven water pump I am assuming the only way for antifreeze to get in is through a failing head gasket or cracked cylinder?
Or a cracked head. Most likely a head gasket.
RON HYDRAULIC YAM
Member
Seen lots of tractor anti freeze issues .. Anti freeze probably runs below 10psi and
120psi or more would usually push compression against the head area and push out
antifreeze as opposed to suck it in. Presume no combustion fuel/oil residue
in the coolant .. But the drawings appear to have jacketing into the crankcase
and possibly the coolant is being drawn into the crankcase and coming up with
the fuel mix. Presume also that you are losing coolant ?? otherwise it was in your fuel
container / lube tank or someone poured it into fuel but then it will normally
snuff the engine with pure coolant ... it is nice to know what was wrong as once
you tear it down , coolant goes everywhere ...Can you do a pressure hold test
on the coolant sys.. Is there any pressure still on the cap after shutting off a few minutes?
... awful question .. did you lick the plug to see if you it is sweet or bitress taste.
was there any colour ? You may just have a condensation issue in fuel tank..
Now my disclaimer .. i know nothing about your sled , just transferring my other
equipment knowledge into this situation .
Some sleds have drains in crankcase and no matter where it drains inside
gravity and the left over rad pressure can make it down to bottom in a few hours or days.
Good luck
Ron
120psi or more would usually push compression against the head area and push out
antifreeze as opposed to suck it in. Presume no combustion fuel/oil residue
in the coolant .. But the drawings appear to have jacketing into the crankcase
and possibly the coolant is being drawn into the crankcase and coming up with
the fuel mix. Presume also that you are losing coolant ?? otherwise it was in your fuel
container / lube tank or someone poured it into fuel but then it will normally
snuff the engine with pure coolant ... it is nice to know what was wrong as once
you tear it down , coolant goes everywhere ...Can you do a pressure hold test
on the coolant sys.. Is there any pressure still on the cap after shutting off a few minutes?
... awful question .. did you lick the plug to see if you it is sweet or bitress taste.
was there any colour ? You may just have a condensation issue in fuel tank..
Now my disclaimer .. i know nothing about your sled , just transferring my other
equipment knowledge into this situation .
Some sleds have drains in crankcase and no matter where it drains inside
gravity and the left over rad pressure can make it down to bottom in a few hours or days.
Good luck
Ron
NorthofSixty
Member
Thanks Ron. I bore scoped the cylinders and the entire perimeter of each piston is washed clean with some residual carbon build up only in the centre area. Plug ground terminals were clean as well with a clear wet coating that was a bit slippery like anti-freeze. I have a new head gasket on it's way but will likely do a complete tear down and install new seals and base gasket as well. I did not think the coolant jacket extended into the crankcase but if it does the base gasket could be the culprit. Will see once I tear it down.