Bypass water passage EA81 intake manifold.

Wombat · Post by **Wombat** » Tue May 11, 2010 10:18 am

Hi, is there a way to bypass the water passage that goes under the carby.
Can this be done by rerouting hoses or only by serious surgery which i will not attempt. Many Thanks Dave.

RSR 555 · Post by **RSR 555** » Tue May 11, 2010 10:41 am

Wombat wrote:Hi, is there a way to bypass the water passage that goes under the carby.
Can this be done by rerouting hoses or only by serious surgery which i will not attempt. Many Thanks Dave.

seems to be a big operation.. why, what you planning? this may give me a better idea for my response

Post by **TOONGA** » Tue May 11, 2010 10:45 am

yes it can be done but you wil have to get the water passages on the manifold tigged shut and the little hoses that go into the block will need to be bypassed as well you will need to find a new spot for your tempreture sender

TOONGA

Wombat · Post by **Wombat** » Tue May 11, 2010 11:11 am

Too complicated i feel. Was just looking for an easy way to stop coolant flowing into the manifold. Thanks for responses.
Will wait for new weber adapter plate to arrive and try once again. Third time lucky maybe.

Post by **TOONGA** » Tue May 11, 2010 11:23 am

you could make steel or aluminium plates (3-5 mm) that are the shape of the manifold gasket and are cut so the water jacket is sealed off but not the intake, then put them between the manifold and the heads and no more water in the manifold

TOONGA

RSR 555 · Post by **RSR 555** » Tue May 11, 2010 11:39 am

TOONGA wrote:you could make steel or aluminium plates (3-5 mm) that are the shape of the manifold gasket and are cut so the water jacket is sealed off but not the intake, then put them between the manifold and the heads and no more water in the manifold

TOONGA

Yep.. this would work but I wouldn't go any bigger than 3mm otherwise there won't be enough thread on the bolts to hold the manifold down correctly.

preno · Post by **preno** » Tue May 11, 2010 12:08 pm

im guessing the adaptor plate u got from redline was the 10-213? (i think?) with a threaded hole at the front? and coolant could flow up into this and then into the manifold?

ive just put one of these on my brumby an all i did to stop the coolant coming up was i put a little bit of waterproof gasket sealant in the hole in the manifold and the hole in the bottom of the adaptor. Also threaded a bolt into the hole at the front of the adaptor plate with some loctite(long enough to cover the small hole that the coolant comes up from). havnt had any problems with coolant flowing into the manifold. hope this helps, might save u a bit of money not buying a new one.

cheers

matt

Gannon · Post by **Gannon** » Tue May 11, 2010 6:26 pm

If you are doing this to keep the intake manifold cool you are wasting your time.

Unless you completely insulate the manifold all over, the hot air off the radiator and heat that radiates off the engine block are still gonna heat the manifold up.

Post by **TOONGA** » Tue May 11, 2010 7:23 pm

he isn't doing this to keep the manifold cool he is doing it to stop a redline adaptor from causing a coolant leak in to the manifold

TOONGA

Gannon · Post by **Gannon** » Tue May 11, 2010 8:06 pm

Ah.

Never mind then

openflame06 · Post by **openflame06** » Tue May 11, 2010 10:04 pm

I used waterproof gasket on my L series wagon to prevent the leak, the coolant as far as I am aware is meant to flow to help heat the carbuerettor and manifold so I dont think bypassing it all together is the greatest idea. Thats just me though.

2coupedup · Post by **2coupedup** » Tue May 11, 2010 10:44 pm

i had a long arguement with a guy on ebay who sold me a new redline adapter, gaskets are crappy with these kits, cut your own for both sides of the adapter out of a bit thicker gasket paper and cover both sides with gasket sealer (remeber waterproof and heat resistant gasket sealer or form-a-gasket), then when putting the adapter on be sure that the 2 bolts into the manifold through the adapter plate are not tightend anymore than the 2 going through the weber and adapter into the manifold or you will lift one edge of the adapter... after assembling DO NOT start the engine untill the gasket sealer has had plenty of time to set/seal...

since i dont this i have had no problems other than finding out i now need to rebuild my weber lol...

cheers

steptoe · Post by **steptoe** » Tue May 11, 2010 11:32 pm

as i said in another post it was a rather simple job to drill the hole out to suit either M10 or M12 thread, tapped it and shoved bolt down with thread goo or tape, maybe 15mm or more to cover the hole pipe also drilled out the metal pipe from memory, tapped with M8? and plugged them too

Wombat · Post by **Wombat** » Wed May 12, 2010 5:55 pm

Thanks to all that responded. I have now managed to get the job done so there are no leaks. (New Adapter Plate) and everything at this stage seems fine.
Keep up the good work. As a new member of this site and new to Subaru's
i appreciate your help in matters that are at this stage are a mystery to me.
Many Thanks & All The Best.