coco502

ok so I found this hole that is open on the d15b block and the same one is blocked on the d16z6 does anyone know if I should block it or not because when I was filling the radiator it started leaking from either that round hole or the one thats below that .....please let me know asap thanks

the first picture is from the d15b

freakasis

i wanna say theres suposed to be a hose barb on the manifold that goes there and a hose that goes from there to the thermostat housing or the water tube. but if its blocked on the z6 its prolly not needed. but just in case i would look at other d-series manifolds and try and find one with a hose barb there. honestly i dont think ive ever seen one without it. what manifold are you using?

coco502

im using the d16z6 manifold.... yeah there is a hose but is from the bottom one not for that top one and even the gasket has that hole so i dont know what to do any suggestions???

coco502

help plzz

bigweedy

did u change the intake manifold gasket for a new one, the old one usually never works

freakasis

my bad thats not the hose barb im thinking of...that one goes up tward the throttle body. and its there on your. so i dont know why it would be leaking. DID you change the i/m gasket? and did you scrape all the old gasket material off?

jalepanos22

Match up with the intake gasket that cover up the hole the most and use that gasket and put a lot grey silicone and you're good. Done it before.

coco502

I blocked the hole with some rubber and so far is holding up... and yes I changed the gasket.....
do you put silicone on the gaskets??? because the guy in autozone told me not to do it cuz it wasnt necessary as long as you scrape the old gasket material

freakasis

you should not need it. its only needed if you fuc/< up the mating surface.

jalepanos22

Yes. You should always apply silicone around water jacket/passage. Also because your gasket is not the perfect match that's why you should use the silicone.

coco502

ok ill do it again thanks... so does anyone knows what the hole is for???

0c00l

I'm guessing you put a D16Z6 head on a D15b? If so What head gasket did you use becuase I'm getting ready to do this as well and I couldn't find anywhere on all mini me write ups which gasket to use the d15b or d16z6. Every write up I find say's use new headgasket, like duh!

coco502

..... hopefully someone could confirm this

0c00l

Well I noticed on ebay the gasket kit for the d15b is like 40 ish and the d16z6 was like 30ish not that 10 dollars makes a difference to me but I just want to make sure I use the right one as well.

projectTeG

isnt that the egr port?

DCRB

i was just going to suggest this... especially with how much carbon build up is in that hole.

0c00l

Hey Coco I found this:

https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/89-d15b2-block-d16z6-head-head-gasket-1712006/

Who'd thunk it!

accord2civic2prelude

use the y8....and that hole is just a coolant line that the z6 doesnt use.

coco502

i got confussed ... I thought u were talking about the i/m gasket.... I used an entire longblock of the d15b so dont know what headgasket you should use ...follow what ^^^^ they say

coco502

so just block that hole??? and should be fine right?

freakasis

think of it this way. if you had the d15 manifold on there and it had an extra barb for an extra hose, what would you do with it? cap it off, right? because you couldnt do anything else with it. so thats all you need to do, just blcok it off before the manifold.