saxavordian
Well-Known Member
Could be the hoses breaking down or if the hoses are brand new and the antifreeze is fresh this could be cleaning out residue of newness. Does the film feel oily or can you slide on a piece of paper.
Nodge68
Well-Known Member
It could be residential oil from your rebuild. Flush the system and see if it returns. If not, then you'll have found the cause.
If it returns, the only place the oil can originate, is via the head oil feed drilling. It only takes a tiny amount of lint from the cleaning process, to cause a problem.
Fingers crossed it's residential oil from the previous repair.
If it returns, the only place the oil can originate, is via the head oil feed drilling. It only takes a tiny amount of lint from the cleaning process, to cause a problem.
Fingers crossed it's residential oil from the previous repair.
htr
Well-Known Member
Only one hose hasn't been replaced - the lower of the two heater hoses. All the rest are about two years old.
I'll see if I can recover some and see if it's an oil based substance.
Nodge68
Well-Known Member
Looks like engine oil to me. It'll be a residential amount from the last rebuild or new from a tiny creep from the oil feed to the head.
Best course of action is to disconnect the bottle from the cooling system so you can drain it into another container.
Clean out the bottle thoroughly and flush the system.
Then monitor to see if there is a reoccurrence.
saxavordian
Well-Known Member
Just thinking if flushing he could monitor the outflow for the oily slick. As he showed in the picture the oil was black so with water and antifreeze being glycol the oil should carry from flushing.
saxavordian
Well-Known Member
Try the paper trick with oil or grease the paper will become translucent. Next try the clump dry then see if the residue breaks down into powder. Oil stay sticky while rubber harden to powder. Other than that if it were green then you have the andromeda strain for which you need to see a doctor
Nodge68
Well-Known Member
It is, as said, quite common to see this after a rebuild.
Over time the oil residue finds its way to the highest and coolest place in the system, usually the tank. It clumps together as oil won't mix with water.
Flush the tank and system, then clean the tank with detergent, not an oily chemical like white spirit.
Standard washing up liquid is fine for cleaning the tank out.
Nodge68
Well-Known Member
I personally wouldn't use a chemical cleaner as harsh as dishwasher power. Have you seen what it does to aluminium?
I find a good dose of Fairy Liquid works well enough, although it does foam a bit. It definitely cleans out all oil residue and won't damage anything in the process.
Just make sure it's flushed out thoroughly.
teddywood1
Well-Known Member
my wife's had that after engine rebuild and yes agree with nodge use washing up liquid
