Coolant Paths

[Kansei240sx]

I've been stripping my RB25DET down recently, heres a few pics.and after some cleaning, i know and ive seen many motors like this and the coolant paths are extremely awful and have all that orange corrosion and grime thats turned to goop, seen covered in the thermostat, in this next pic

What did you guys do or can do to clean this out the best way with out having to completely dismantle the engine, im only wanting to strip this motor down to the bare block and head, or pretty much what you see on this side.... Ideas?

[Spazz]

hot tank it to be 100% sure its clean.

[rbsileighty]

I did a new thermo and replaced all of the cracking lines, then took it to my friend at a dealership and had the system flushed twice... all clean now.

I also ran straight DI water in the system for a while before I had it flushed and that pulled out a lot of gunk as well... seemed to loosen things up.

[Kansei240sx]

Thanks , i got some tips at work as well, i work at a car dealership in the service bay as a porter, ill let you guys know when im done, this is a huge project and i've got a bunch of pictures posted, im making into a montage/video when im done which ill post.

[300Plus]

Part on topic part off but......

Why not stick a water hose in the top and let it flow out the bottum for awhile? not as affective I'm sure but wouldn't it work pretty good?

And I'm wanting to clean the oil system as well and my dad was telling me they use to use diesel fuel back in the day, just poor it in the top and let it drain out.

Whatca think???

[Kansei240sx]

Part on topic part off but......

Why not stick a water hose in the top and let it flow out the bottum for awhile? not as affective I'm sure but wouldn't it work pretty good?

And I'm wanting to clean the oil system as well and my dad was telling me they use to use diesel fuel back in the day, just poor it in the top and let it drain out.

Whatca think???

Gasoline or Diesel fuels are good solvents, just gotta be careful about the flammability level and makes sure you get ALL of it out.

[300Plus]

well givin a day wouldn't what didn't drain out of the pan evaporate? and what about the water hose idea?

[Darius]

I would do it outside or with the garage door open for a couple days to make sure all the pooled fuel has been given a chance to evaporate. Gas in your oil is very bad and adversely affects the oil's lubricating properties.

About the water hose in the block, I've never heard of someone doing this, but I doubt it would work as well as filling the system with distilled water and running the car that way. The water hose probably won't be able to push enough water around to get to the heater core and all the coolant routes in the head. Plus you dont want to run faucet water in your cooling system because the calcium carbonate will precipitate out of solution onto your radiator core and everything else with the increased temperature. It's weird that calcium carbonate becomes less soluble with an increase in temperature, so that's why you use distilled water.

[300Plus]

True.... I'm trying to prevent the junk in the coolant lines from getting into the rad. so I guess I could run it with now distilled water in the block and raditator and leave the upper hose off to collect the dirty water..... sounds like a plan.

as far as the diesel fuel it should evaporate but is there anything else anyone suggests running through the system?