Unidentified hole?

[ChrisfromVT]

There is a small threaded hole next to the #1 spark plug hole on my '87 inline 6 tower of power.
What is this hole and should it be plugged?

 

[ChrisfromVT]

Re: Unidentified hole?

Also forgot to mention that water comes out of this hole when motor's running, but it doesn't seem to be affecting performance.
What goes there?

 

[ChrisfromVT]

Re: Unidentified hole?

Could this be for a water temp sender or something of the like?
Anyone?

 

[narvlebenoit]

Re: Unidentified hole?

I gess it could.I have one on my 90 h.p. and it has a plug in it.

 

[ChrisfromVT]

Re: Unidentified hole?

I'm a bit freaked out...
The water is actually coming out of the #1 plug hole! I pulled all the plugs and they all have water intrusion evidence. Does this mean that the water cover gasket is shot??

 

[narvlebenoit]

Re: Unidentified hole?

Iam having the same problem my plugs are super clean .read mine on page #4 need help with motor.

 

[ChrisfromVT]

Re: Unidentified hole?

The plugs aren't super clean. They seem to be firing fine, but they all had a milky substance around them (like water and oil mixed together). Could they hace possibly not been seated right?

 

[narvlebenoit]

Re: Unidentified hole?

Chris I took a look at mine an I have that little hole to the one with the plug is between #3 an #4.I dont think the milky stuf is from the plugs not being seated.

 

[verado7]

Re: Unidentified hole?

exhuast and or water jacket gaskets are leaking - possibly a warped water jacket cover also - the hole next to plug could be a water sender -the simple one that goes to warning buzzer is usually smaller than the sender hole for the guage - you can plug them but it would be wise to install another sender -preferably aftermarket because your motor will die quickly before you even know it -should the water pump fail at any speed .

 

[Surfer Dave]

Re: Unidentified hole?

this is for a water pressure gauge