LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Leaking coolant, where from?!

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Old Nov 20, 2008 | 04:31 PM
  #21  
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Originally Posted by James Montigny
Not my diagrams, those are from ShoeBox's site (www.shbox.com).
Extremely useful.
You'll find similar diagrams in any GM, Haynes or Chilton's manual.

The WP is actually not too difficult to swap. 6 bolts
I usually drop my radiator fans to make it easier, but otherwise you can pull it
off without undoing much beyond the intake, hoses and accessory belt.
(and drain the coolant, obviously)

It's a great excuse to replace the stocker with an electric water pump.
http://www.projecttransam.com/projects9.asp
Thanks for the links, very useful. I read on one of the links that you can just rebuild your stock waterpump for less $? is this true? ive never heard of rebuilding a water pump
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Old Nov 20, 2008 | 04:36 PM
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Originally Posted by nik1703
Thanks for the links, very useful. I read on one of the links that you can just rebuild your stock waterpump for less $? is this true? ive never heard of rebuilding a water pump
You could rebuild a stock pump or trade it in for a remanufactured one, yes.
When you are done, you'd have a stock pump.
I've never rebuilt a stock pump, but it hardly seems worth it when you can
get a reman for $70 or buy one from someone parting out an LT1 for $30.

I suggested the EWP as a way to pick up a few HP out of the deal.
But you are right, it will cost you a little more.
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Old Nov 20, 2008 | 04:41 PM
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Originally Posted by James Montigny
You could rebuild a stock pump or trade it in for a remanufactured one, yes.
When you are done, you'd have a stock pump.
I've never rebuilt a stock pump, but it hardly seems worth it when you can
get a reman for $70 or buy one from someone parting out an LT1 for $30.

I suggested the EWP as a way to pick up a few HP out of the deal.
But you are right, it will cost you a little more.
How much HP are we talkin? maybe like 5? If i have the extra money laying around i'll pick one up.. or if anyone is selling one on here for cheap.

I dont even know if it's my waterpump, I should probably figure that one out first. lol
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Old Nov 20, 2008 | 04:51 PM
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Originally Posted by nik1703
How much HP are we talkin? maybe like 5? If i have the extra money laying around i'll pick one up.. or if anyone is selling one on here for cheap.


Originally Posted by nik1703
I dont even know if it's my waterpump, I should probably figure that one out first. lol
Yes, it might be something as simple as a leaking hose. (much easier and cheaper fix)
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Old Nov 20, 2008 | 04:57 PM
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jesus, 10 HP off a water pump? thats ridiculous. do you or anything else have experience with pulleys? i've heard they arent worth the money.
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Old Nov 20, 2008 | 05:00 PM
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Originally Posted by nik1703
jesus, 10 HP off a water pump? thats ridiculous. do you or anything else have experience with pulleys? i've heard they arent worth the money.
That's a hot topic around here.
My personal opinion is that they improve throttle response and help the engine rev faster.
They don't add as much power as they might on other motors.
Specifically, I like them on H/C cars because they have a higher idle and the overdrive alt pulley becomes unnecessary.

Would I do it on a stock motor? Probably not. Not at full retail price anyhow.
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Old Nov 20, 2008 | 05:03 PM
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Originally Posted by James Montigny
That's a hot topic around here.
My personal opinion is that they improve throttle response and help the engine rev faster.
They don't add as much power as they might on other motors.
Specifically, I like them on H/C cars because they have a higher idle and the overdrive alt pulley becomes unnecessary.

Would I do it on a stock motor? Probably not. Not at full retail price anyhow.
So basically you're saying that they're a poor mans lightweight flywheel? lol.

On my E36 M3 it got me about 5 HP, not bad, but it was 200 bucks. I probably wont waste my time with mods like that when i can spend 500 and get a ton more HP out of a cam.

Ill keep you guys posted tonight with some pictures, thanks for all the help
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Old Nov 20, 2008 | 05:40 PM
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I put a pulley on my car!
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Old Nov 20, 2008 | 05:48 PM
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so is the coolant hitting the k-member? there are plenty of places it could be coming out. i would say waterpump/thermostat housing first. rad hoses second. heater hoses third. rad 4th. overflow bottle 5th. get pics though.
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Old Nov 20, 2008 | 05:59 PM
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Originally Posted by sweetbmxrider
so is the coolant hitting the k-member? there are plenty of places it could be coming out. i would say waterpump/thermostat housing first. rad hoses second. heater hoses third. rad 4th. overflow bottle 5th. get pics though.
Im not sure.. ill check when i get home. warm it up and see where its coming from with my little flashlight.

When you refill these cooling systems.. do you have to bleed them? or just fill em up and thats it?
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Old Nov 20, 2008 | 06:01 PM
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Originally Posted by nik1703
Im not sure.. ill check when i get home. warm it up and see where its coming from with my little flashlight.

When you refill these cooling systems.. do you have to bleed them? or just fill em up and thats it?
There are two bleeder valves to the front/left of the throttle body.
Use those to bleed air out while you add water/coolant.
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Old Nov 20, 2008 | 06:25 PM
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maybe its any one of these parts!?!?!

if not i can give a bunch more recommendations, clueless answers and screen shots
Attached Thumbnails Leaking coolant, where from?!-lt1-explosion.jpg  
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Old Nov 20, 2008 | 06:27 PM
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Originally Posted by gectek
maybe its any one of these parts!?!?!

if not i can give a bunch more recommendations, clueless answers and screen shots
Way to narrow it down for him LMAO


Here's your cooling system
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Old Nov 20, 2008 | 06:28 PM
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Originally Posted by James Montigny
Way to narrow it down for him LMAO


Here's your cooling system
Originally Posted by gectek
maybe its any one of these parts!?!?!

if not i can give a bunch more recommendations, clueless answers and screen shots
lol yeah thanks guys.

i will update tonight when i get home..
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Old Nov 20, 2008 | 06:34 PM
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When my water pump went that's exactly where it was leaking, I'd wager that's what it is.
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Old Nov 20, 2008 | 06:36 PM
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Originally Posted by grossesexy
When my water pump went that's exactly where it was leaking, I'd wager that's what it is.
you know whats awesome though? it lost a LOT of coolant because i drove around all day not realizing it was leaking and the needle never moved, stayed cool and i was driving hard. these cars are awesome, if this was my E36 M3 one bubble of air in the system or a drop of coolant on the ground would mean it would overheat and warp the head.
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Old Nov 20, 2008 | 06:39 PM
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Originally Posted by nik1703
you know whats awesome though? it lost a LOT of coolant because i drove around all day not realizing it was leaking and the needle never moved, stayed cool and i was driving hard. these cars are awesome, if this was my E36 M3 one bubble of air in the system or a drop of coolant on the ground would mean it would overheat and warp the head.
Wait until you replace the water pump and drain and refill. Air gets in the system very easily then and it will heat up quickly, so make sure you watch that and bleed it appropriately.
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Old Nov 20, 2008 | 06:47 PM
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Originally Posted by grossesexy
Wait until you replace the water pump and drain and refill. Air gets in the system very easily then and it will heat up quickly, so make sure you watch that and bleed it appropriately.
well, i predict a bleed in the very near future, so ill probably be reading up on proper bleeding instructions. this is what i know from previous experience.

1. fill up system with coolant
2. start the car and warm it up a little
3. open the bleeder screw, let some air out, close it.
4. rev the car up a little, 1500RMP for a minute or so
5. open bleeder screw, let air out. close it.
6. repeat until air stops coming out
7. done

sound right?
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Old Nov 20, 2008 | 06:52 PM
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Originally Posted by nik1703
well, i predict a bleed in the very near future, so ill probably be reading up on proper bleeding instructions. this is what i know from previous experience.

1. fill up system with coolant
2. start the car and warm it up a little
3. open the bleeder screw, let some air out, close it.
4. rev the car up a little, 1500RMP for a minute or so
5. open bleeder screw, let air out. close it.
6. repeat until air stops coming out
7. done

sound right?
If you open the bleed screw with the pump running, it will spew out more coolant than air.
I leave the screws open while I slowly fill the radiator, shut them when fluid appears.
Finish filling the radiator.

Start car, let it idle until the tstat opens. (watch gauge, it will drop)

Stop, let cool, repeat above steps until air is gone.
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Old Nov 20, 2008 | 07:31 PM
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Originally Posted by James Montigny
If you open the bleed screw with the pump running, it will spew out more coolant than air.
I leave the screws open while I slowly fill the radiator, shut them when fluid appears.
Finish filling the radiator.

Start car, let it idle until the tstat opens. (watch gauge, it will drop)

Stop, let cool, repeat above steps until air is gone.
That's how I've been doing it too.
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