Water pump pipe differences

chrysler kid · Sep 14, 2017

So I re did the head on a gst with an eBay 16g turbo

I'm comparing my 96 gst to the 98 which has the improved block design and black box ecu

My question

The cylinder head is getting hot much too quickly on the 98. It will boil out of the cap when I try to purge the system with the cap off

The coolant pipe is different on the 98. The water tube nipple is pointing downwards on the pipe, and the block fitting for the turbo coolant feed is facing the oil filter housing

On my 96 the water pump tube has a feed line directly before the oil feed, the 98 points down ward.

I believe the 98 has a water pump tube from a 1st gen eclipse, but I need info from some one who might know the difference

This is how it should look, the first tube in green going to the turbo is missing on my 98, it is pointing downwards on it now

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AdR · Sep 14, 2017

If it points downward and connects directly to the lower rad hose, it's a 1G water pipe and thermostat housing. If it points upward and mates with a rubber oring to the thermostat housing it's a 2g configuration.

Archer Fabrications · Sep 14, 2017

One in your picture is a 2g water pipe, but are you asking about the water pipe or the water PUMP

chrysler kid · Sep 14, 2017

The coolant pipe that runs under the exhaust manifold, from the water pump, that connects to the thermostat housing on the head.

Also the coolant port on the block under the large water pipe from the pump to the thermostat housing

I believe I found the answer, the automatic cars had the coolant pipe at the bottom which fed the turbo, and the coolant port from the block would vent into the oil filter housing.

At least, that is what I assume since extreme psi lists two different t25 coolant lines (manual/automatic). Also I've found other images of 2g cars with the same water pipe design and block water outlet

19Eclipse90 · Sep 14, 2017

The only water pipe for 2G turbo cars is MD306269, no difference between automatics and manuals. To that point, there is no variation in coolant pipes at all in or around the turbo in regards to transmission. The diagram above is the end-all-be-all OEM diagram for 2G turbo cars.

ExtremePSI shows (3x) joints for coolant:

coolant feed at block
coolant feed at turbo
coolant return at turbo

The water pipe has (2x) returns built into it and the other feed is at the thermostat housing.

Archer Fabrications · Sep 14, 2017

When your coolant boils over with the cap off, is your heat on? Heat needs to be on

chrysler kid · Sep 15, 2017

AdR said:
If it points downward and connects directly to the lower rad hose, it's a 1G water pipe and thermostat housing. If it points upward and mates with a rubber oring to the thermostat housing it's a 2g configuration.

The pipe itself points upwards to meet with the thermostat housing. I replaced the o ring to the thermostat housing a few days ago

19Eclipse90 said:
The only water pipe for 2G turbo cars is MD306269, no difference between automatics and manuals. To that point, there is no variation in coolant pipes at all in or around the turbo in regards to transmission. The diagram above is the end-all-be-all OEM diagram for 2G turbo cars.

ExtremePSI shows (3x) joints for coolant:
coolant feed at block
coolant feed at turbo
coolant return at turbo
The water pipe has (2x) returns built into it and the other feed is at the thermostat housing.

Yeah I get that. It's not like I or anyone else would weld a new tab onto the water pipe. There appears to be 2 different styles of water pipes, one with a feed directly under the o ring for the turbo, another style with a feed at the bottom of the pipe before the bend upwards to the housing. See picture below
http://www.dsmtuners.com/threads/water-pipe-block-off.378988/

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Archer Fabrications said:
When your coolant boils over with the cap off, is your heat on? Heat needs to be on

Heater is on, cap is off. Possible problem with a coolant feed line to the turbo is showing severe calcification and boiling coolant out of the fitting at the turbo. Not as much of a leak as it is a coolant ooze out of the fitting. I have removed exhaust manifold to inspect turbo for signs of oil seal failure and found valve seal failure

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Water pump pipe differences

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