Flush after layup

[petrolhead]

My engine hasn't been run for a couple of years, it's partially disassembled (lower unit off) and before reassembly and running I want to flush it through to remove any accumulated crud from the cooling passages, not that I think there's much if any, but just to be sure.<br />I don't want to start stripping the powerhead, and I was wondering if there's anything I can use to flush it that would dissolve any aluminium oxide etc..., and maybe help to prevent any further corrosion, rather like kettle descaler (although I'm not suggesting I use that of course!).

 

[crazy charlie]

Re: Flush after layup

You can do something simple like using white vinegar.It works quite well for cleaning.There is also a product called salt-x or Salt away that is for the same purpose.Charlie

 

[petrolhead]

Re: Flush after layup

I may try the vinegar, I don't think the engine has ever been run in salt water, or if it has then not recently. <br />Would vinegar dissolve aluminium oxide? I've used acetic acid solution for cleaning copper components prior to brazing and it's quite aggresive, really etches the surface after just a few minutes, I don't know how it would work on aluminium?

 

[Solittle]

Re: Flush after layup

What motor do you have??<br /><br />I would take the T-stat cover off then backflush via the water pickup tube in the lower unit. Forget the chemicals.

 

[petrolhead]

Re: Flush after layup

1958 Johnson 18hp (FD-12), it doesn't have a thermostat.<br />Flushing via the water tube is what I was thinking, with enough pressure it should dislodge dust, dead insects, spiders nests etc..., but I was thinking some sort of additive might do a better job.