I just received my FD that has been sitting for 4 years and I have some work ahead of me. First thing before I think about trying to crank it over is to flush the Anti-freeze gunk out of the whole system including the heater core. I need to drain the gas out of the tank and replace with fresh 93 octane. I also need to drain the oil and change it, once its running I'll let it idle for a bit than replace the oil and filter again. Replace plugs and wires.

My main concern is to get the old coolant out of the system which is thick and brownish.

How can I go about getting the coolant out of the system/motor/heatercore?

 

http://www.scuderiaciriani.com/rx7/h...ng_system.html

 

remove the thermostat, upper, and lower radiator hose. Then run water through the thermostat housing using a garden hose. i think you have to leave the car in ingition 2 and turn on the heat also to open up the heater core passage.

that should flush out the system (not including the radiator).

i haven't done this personally but it seems logical.

anyone else?

 

Thanks... I was thinking the same but needed some assurance.

Im replacing the fuel filter this week which isnt a problem but am not sure how I should remove the gas in the tank which is hella old.

 

Thanks.. that hit the spot

 

What they're saying on that site is to flush the radiator, fill it and than run the car, replace it and run it. Trust me if youd see this sludge in the AST than you wouldnt want to run it either.

~nitro

 

Are you sure that thick brown solution isn't CRC block-weld or some other coolant system sealant?

 

I'm not sure.. I can take a picture of it but its ugly.

 

http://home.comcast.net/~frank.s/DSC01726.JPG

 

nt

 

I can't really tell from that pic. It could just be rust. A coolant flush is not that hard, but you'll be waiting for things like fill-up and drainage. You can get to the radiator plug right through the undertray. To help prevent air pockets, disconnect the TB coolant line. After my first drainage, I filled up completely with distilled water, ran the engine from a few minutes and re-drained. Then I filled the system with 66% distilled water and 33% anti-freeze (because I'm in Florida). To burp the system I parked the car nose-up on a ~30 degree incline and ran the engine for just a minute. I put in some more coolant mix and I never heard the coolant level warning buzzer again.

IMPORTANT: Don't forget to reconnect the TB coolant line before running the engine.

 

Thanks for all the help, I'll be doing these things this weekend.

After the coolant flush I will be replacing the thermostat to finish the job.

 

Where did you find an incline in Florida? Run it up on a curb?

I advocate Jon's method - by never introducing anything but distilled water and coolant you're better off, IMO.

Dave

 

I have about 3/4ths a tank of gas in it what should I do? should I just run the car till its empty, add some additives or try to drain it. Dont forget its been in there for a little over 3 years. It will start right now.

 

Drain it if you can, at the very least siphon a lot of that old fuel out. For better coolant system burping, use this tool: https://www.rx7club.com/3rd-generation-specific-1993-2002-16/radiator-cap-funnel-eliminate-air-bubbles-342309/

-s-

 

Open your gas cap and push open the flapper door. Give it a good smell. Does it smell at all like wood varnish (the kind you would use to stain wood furniture a darker color)? If not, then I would use the gas and just keep the car in the lower RPM range until the next full tank of gas.

 

Ok than I will replace the fuel filter when she runs out.

 

Hmmm... I wonder if you have Evans coolant in there. It's supposedly purple at first, then quickly turns brown when it's exposed to engine heat (which is supposed to be normal).