Buy a reverse flush kit and some heavy duty cooling system cleaner first.
Taking out your freeze plugs will not help all that much and could cause you
a lot of grief if not done correctly.
I would also remove the rad and have it boiled out or have a shop put a
heavy flush into it. Different shops do different things.
Mike
----- Original Message -----
From: <ambradley@attbi.com>
To: <datsun-roadsters@autox.team.net>
Sent: Saturday, May 11, 2002 11:46 AM
Subject: Best way to clean water passages
> OK, this is for my PL411 w/J13, not my Roadster, but I
> imagine the method is the same. Short of dipping the
> block to clean up all the gunk, is there a good way to
> clean the water passages? I assume I'll have to take
> the head off, and I may take the freeze plugs out.
>
> My car has been overheating a bit (not horribly) and so
> I drained the radiator *again*, but this time I decided
> to drain the block too. I turned the drain valve and
> nothing came out. I removed the draincock from the
> block and still nothing came out. I poked in there
> with a screwdriver and it's packed with black soot.
>
> I figure either I've got a head gasket leak cramming
> soot into the passages - although the car's not
> overheating badly (only hits high after 10 minutes on
> the freeway, doesn't go too high in stop & go traffic)
> and the radiator isn't spewing compressed air - or
> could it be something else built up over the years?
>
> So I guess I have two questions: (1) how did it get
> there? and (2) can I clean it by snaking some pipe
> cleaner or something through the water passage holes in
> the top of the block? If so, what should I use?
>
> I'm not ready to rebuild the engine yet. I'm moving in
> two weeks and will be cash poor for a while. I've got
> a gasket set so this shouldn't cost much.
>
> TIA for your advice!
>
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