Water leak in 3.1 (Fiero)

[twentyeight]

Hey all
I'm nearly finished swapping in (another) 3.1 block into an 86 Fiero GT. I used the timing cover that was on the original 3.1, which was on the Fiero 2.8 before that. On the back of this timing cover, just above the hose clamp on the oil filter side is a hole about the size of a #2 pencil. When I fill the water, it pours right back on the ground through this hole. Is it some kind of weep hole? I'd just fill it with JB Weld, but I'm concerned it may be a port for water jacket flow. Anyone have any ideas what it's about?

Thanks much

[geoffinbc]

Pics? Does the hole have threads in it?

[CNCguy]

On the back of this timing cover, just above the hose clamp on the oil filter side is a hole about the size of a #2 pencil. When I fill the water, it pours right back on the ground through this hole. Is it some kind of weep hole? I'd just fill it with JB Weld, but I'm concerned it may be a port for water jacket flow. Anyone have any ideas what it's about?

Thanks much

The hole is used to circulate coolant through the water pump while the T-stat is closed. It pulls coolant into the inlet side of the water pump from the front of the block. That hole is usually found on RWD blocks. FWD blocks don't have that hole and circulates the coolant through an external tube the runs from the T-stat area to the water pump.

You should be able to tap the hole in your cover for a 1/8" pipe plug to stop your leak and the circulation will be forced to go through your heater core.