How do you clean oil lines to the front oil cooler on a 69S

[MJHanna]

As they are not removeable what is the best way to clean them out?

[jameshtaylor]

Fortunately I've never faced this issue. Assuming that you didn't suffer an engine failure which filled these lines with pieces of metal (and requires serious aircraft quality cleaning if you don't want to destroy your next motor in short order,) I'd think about rigging some kind of small pump to push kerosene or another cleaning substance thru to a bucket where you could catch and recirculate it a few times. You might also think of pulling the oil cooler at the front so you could push cleaning fluid at that end while letting it drain out at the rear, one tube at a time. Again some sort of small pump is going to be needed to move the fluid along. Harbor Freight shows two small drill driven pumps for under $15.