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bwmac's Avatar
 
Join Date: Mar 2010
Location: Fort McMurray, Alberta, Canada
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Were do you install the rad flush tee

I was thinking of installing the flush tee in the front 1 inch hose that connects between the rad hoses.
what's your thoughts
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Names Brad, Canada, Fort McMurray.
Car is a 1989 928 5L AT from Japan, 17" rims, 95,000 k vin#WPOZZZ92ZKS842476
Old 07-02-2010, 06:39 AM
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Petie3rd
 
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in a word....dont.
if you want to flush the radiator drain it from the blue plug on the bottom of the passenger side then remove both of the radiator hoses and put in the hose,
or you can remove the whole radiator from the car , if you want to flush the engine then you need to remove the block drains each bank holds about 1.5 gallons of coolant and add water through the top radiator hose connection to the water bridge.
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Old 07-02-2010, 07:36 AM
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OK I have to ask why not? is it due to possible pressure damage?
I plan on running a can of 10 min flush through it to remove the rust, then flush it out with water till it runs clean, then drain and refill with aluminum compatible antifreeze.
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Names Brad, Canada, Fort McMurray.
Car is a 1989 928 5L AT from Japan, 17" rims, 95,000 k vin#WPOZZZ92ZKS842476
Old 07-02-2010, 07:57 AM
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Because they are all expensive custom hoses with multiple diameters and there are other ways to flush. Like drain, refill, repeat. Or 16 gallon shopvac on one big hose, flush solution / water on the other. You can pull 100 gallons backward through the thing as fast as you can dump the shopvac. Or combo.

There's also a stigma against cobbling them up or even, as you've seen, bypassing the WSM. Huge negative perception amongst the typical Porsche owners group I've found. (Though some of them sure love adding modified race parts).

Do what you are comfortable with. Just expect negative reactions, like when you took the girdle off the block without removing the engine.
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Old 07-02-2010, 08:01 AM
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first of there should be no rust in the system as it had an aluminum block,
second the cleaner may damage the headgaskets and cause them to fail .
a flush for the 928 should merely be, drain radiator and block, refill with distilled water drain and fill with your favorite coolant i suggest Zerex Zo5 coolant found at NAPA
As an aside just adding a T isnt going to flush much as the block will be holding 3 gallons and the flush system wont circulate through the block so it drain the radiator and then both of the block drains first
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Last edited by Mrmerlin; 07-02-2010 at 11:59 AM..
Old 07-02-2010, 11:56 AM
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I expect the rust came from the oil coolers or water pump.
I didn't use the flush chemical since the car is old and I don't want to cause a head gasket leak on our trip.
pulled drains and let the water flow.
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Old 07-04-2010, 09:20 AM
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Flushing will not achieve anything unless you also remove the block drain plugs (two 13mm headed bolts on underside of the block).

I flushed my '87 repeatedly until it ran clear after failing to remove the block plugs. I used the radiator flush in a bottle stuff to run the car up to temp before draining and flushing. I also flushed using a hose pipe to keep the system full while the engine was running, so the pump circulated clean water through the block.

Then I figured out how to get the plugs out (drilled a flat onto the side of the rounded-out head, and used a punch and hammer to get them turning).

I was amazed at the huge amount of sediment that came out the block even after all the flushing.
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Old 07-04-2010, 03:50 PM
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that huge amount of stuff that came out was probably a good part of the exposed headgasket material that the cleaner was circulating around.
, so the gaskets are cleaned where the coolant flows, but now they are also thinner and quite possibly they will begin to leak in a short while.
A leaking headgasket will first be noted along the top edge of the block along the V you may see a crusty white material along the edge of the gasket then you may have a cylinder begin to get coolant in the bore
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1988 S4 Auto , Color is Elfenbein Perlglanz, Pearl Gray
1985 Porsche 928 Euro 5 speed , Black on Black 16V
2011 BMW K1300S Magma red
Old 07-05-2010, 05:41 AM
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Old 07-05-2010, 05:41 AM
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