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Anyone ever replace heater hose nipples in the block?
Posted 08 November 2012 - 11:27 AM
Anyone ever replace one of these somehow?
I assume if no replacement is available I would have to remove the bad nipple and tap the hole for a threaded nipple (hmmm, steel or brass?), unless I could get lucky and find some steel line (big brake line?) that could be a decent press-fit.
Tapping the hole for a tapered nipple would be nerve-wracking, given how thin the boss in the casting is right there. Would also have to make sure it didn't introduce a restriction as the only coolant flow before the thermostat opens is through that line.
Posted 08 November 2012 - 01:57 PM
that nipple is actually on the water pump. it has to be since it is not on the t-stat housing / cover. a short 'ell' shaped hose connects it to a metal pipe that is bolted to the block and runs back and up to the heater hose.
the other heater hose nipple is on the coolant crossover pipe under the intake manifold. both can rust.
but neither is in the block. i don't know how hard it is to remove the lower one with the engine in the car. i never knew it was there until i did the head gaskets and by then the engine was already out.
Edited by johnceggleston, 08 November 2012 - 02:08 PM.
Posted 08 November 2012 - 02:30 PM
If the H4s are different I guess that's why I never heard of them being replaced before.
Edited by CNY_Dave, 08 November 2012 - 02:52 PM.
Posted 09 November 2012 - 10:33 AM
Drilling and tapping should be fine. I would probably use a non-pipe thread and coat the threads with pipe dope or Indian Head shellac before installing the nipple to prevent leaks.
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