Hey fellow owners. I just purchased a 93 with a new motor, clutch, and important engine stuff. Apparently, the person who had the car before me tried to up the HP by removing the airpump and in the process, hooking the waterpump up backwards. Dumbass. Anyways, I just bought the car with a new mazda motor and the guys who put it togethor said that the line you will be able to see in the pic, was plugged when they got it and could not find where it goes on the vaccum line schematic. Can anyone tell me if this line is supposed to be plugged, if it needs a one way valve, or if it goes to something. Thanks for the help.

 

There is normally just a rubber cap on that nipple, it looks like it was used for a line to a boost gauge. That is what I am using mine for.

Matt

 

No, that line doesn't go anywhere, both of my 7's where capped off like that and they where totally stock.

 

From the factory that nipple is plugged and goes nowhere. That is why they could not find it on a vac diagram. I would be slightly concerned if the shop didn't know this and I was paying them to work on my car. That is the nipple that most people hook their boost guage up to BTW.

 

Like the previous post. Boost Guage they come factory with a rubber nipple on them.

 

Normally the line is plugged/capped. Most use it to run a hose to a boost gauge.
regards,
Crispy


Geez take 3 minutes to get a post up and 5 people have answered the question already!

 

Thanks all. I had a feeling that was what it was for.

 

I would love to see a picture of how you hook up a water pump backwards. I didn't know that was possible. Maybe the "dumbass" hooked it back up wrong when he installed the "spark plug elimination kit". Yeah, that's it!

 

LOL...spark plug elimination kit!!

 

You can hook a water pump up backwards. The fins either push water through the engine, correct, or if run backwards pull the water out of the block. That will last for about a minute until the backpressure bust all the fins off the water pump.

 

Well, no, you cant hook it up backwards. I really hope that a shop didn't charge you to "hook it up correctly." If they did, you should never go back.

The "fins" or impeller on an FD water pump is attached to a shaft that is pressed into the water pump bearing in the pump cover. If you put that in backwards, the impeller would be on the outside, and the pulley would be inside the water pump housing. Or, if you could somehow turn the impeller around on the end of the shaft (which I think is impossible), the coolant would just flow backwards throught the engine. There would be no "backpressure" created. There is no check valve in the system. And even if there was, it would surely not create enough force to shear the fins off of the impeller. Think about it.


Basically, I replied to your comment as a way of saying "Think before you type." I noticed that you are new to the forum, and I assume new to FD's. Yet you are trying to argue a point that requires specific knowledge of not only the FD cooling system, but fluid mechanics, strength of materials, and physics. Maybe you should consult an professional engineer that has owned four FD's and done an engine swap before you try to argue this point further.

Jeff Bernardo, PE

PS--Remember, everything you type on here is open to scrutiny, and you can't take back what you say. Unfortunately, there are numerous people that post on this forum that have absolutely no idea what they are talking about. It is okay to say you don't know about something, like you did with the UIM nipple. Just don't fake it. Remember, it is always better to be silent and let us wonder if you know something, than to open your mouth and prove that you don't.

 

 

Actually, with the airpump removed, one can run the drive belt around the water pump pulley on the "wrong side" and thus run the pump in the wrong direction. Hard to see how someone could make this mistake but it could happen I guess. And I'd suspect the car would overheat within minutes.
Crispy