Picked up a new to me 2000 F4, giving it a tear down and changing all the usual suspects and find a small amount of oil in the coolant (oil looks fine fyi).

Appreciate this could be one of umpteen things but I'll start with the easier stuff and see where I get to. Having read a few post online, the oil cooler looks like a reasonable source of the leak and easy to address first... but looking at it it appears to be a sealed unit with no gaskets between coolant/oil flow to change... so am i looking at a straight swap for a new cooler?

https://www.fowlersparts.co.uk/parts...il-panoil-pump



Thanks

 

If you remove the oil filter and pressurize the cooling system, you will see if it's leaking or not. That kind of cooler doesn't fail all that often. I'd be surprised if yours was bad.

Don't overlook the water pump. Coolant is at higher pressure than the oil there, with not much separating them.

 

Yeah I think the references i'm reading to the cooler failing are more on the F2 and F3 where it was a totally different design.

I don't have a pressure test kit for the radiator, So i'll go for the take it off and have a look at it approach in the first instance!

I need to give the bike a serious clean and degrease at the weekend then get a better look at everything including the water pump. I'm right in thinking the oil/coolant seal within the pump isn't serviceable so it's a straight swap?

Basically trying to rule out everything I can before pulling the cylinder head.

 

If the pump seal is bad, you have to replace the pump.

Some auto parts stores will rent/loan you a tester. It's the same connector as some cars. Bring your cap with you....