What's this seal for?

and as you happen to have the head off could you measure the hole in the back of the head that lets the coolant into the manifold, as i need to make that hole in the back of my gti head it would usefull to know the size and depth of the hole.
cheers
john

 

will do in a bit mate and get back with the figure for you

 

Heres a pic so you can get an idea for it :-



The small hole you see on the head is 0.8mm , the depth is around 610mm, the hole where the seal sits into on the manifold measures 220mm.

Hope it helps.

 

so the hole is 8mm or .8cm diameter but the depth seems alot is it 61mm/6.1cm?
cheers
john

 

sorry 8mm and 61mm

 

thats a well deep hole to drill
but thanks rich for the info
john

 

Can you weigh the seal please, for Chris Eyre?

 

weigh it? 4 real lol

 

it gunna weigh about 2grams probably

 

Need it down to the milligram really, for Chris and DaveD.

 

With regard to drilling the gti head for this water outlet. What head are we talking about?
Some k jet heads have a stub in this position that links the injector bosses so in event of a o ring failure the car does not run excessively weak on the affected cylinder. It may not be advisable to drill it without checking you will not hit a drilling.

 

TheSecondComing I will weigh the seal at work as our scale is dead accurate, will post tomorrow with the findings

 

it is a gti PB head with a 1.8 carb manifold attached

 

I think the PB digi one is ok to drill, but I will have a look at a head tomorrow and check.
It is not imperative that the inlet manifold has a coolant flow through it. You can just fit it as is and blank of the hose from the metal coolant pipe that would connect to the outlet from the inlet manifold.
NB. Do not mix up this inlet manifold coolant outlet and the servo take off from no 4 port runner!

 

thanks for taking a quick look for me
and don't worry about the coolant outlet and the servo line i have that one figured out

thanks
john

 

Had a look at a digi head today. I removed one of the injector bosses in it and checked there was no drilling like in some of the kjet heads.
It did not have this drilling so it would be ok to drill the water way for the carb inlet manifold on my head.
It may be an idea to whip out an injector boss next to where the hole is meant to be on your head ,to double check it is the same.

 

am confused what does the injector boss have to do with drilling a hole in the head, what was you looking for by removing said boss?

 

You cannot drill some k jet heads for the coolant outlet as this drilling that links all four of the injector bosses passes through where you would be drilling the hole for the coolant outlet.

 

so how do i know which head i have?, it is a certain part number?
thanks for all your help by the way, is it appreciated

 

If you can post up the casting numbers on the front of the head above the spark plugs that will help to confirm what you have.
A pic of the back of the head at the injectors and where the coolant passage would be will confirm too, if you do pics that is.