First drive, first problem

[tpepmeie]

Originally Posted by Dynomite

And would BLOCK TB Coolant at the Injector Housing.

I wouldn't advise doing this, though lots of people continue to encourage it. That part of the circuit is designed to assist the bleeding of air from the system. Blocking it could potentially restrict the ability to purge the system of air as designed. The only acceptable way to keep coolant out of the plenum, IMO, is to tap into the top of the coolant outlet pipes (there is a cast boss which almost looks like it was designed for this) and pick up the bleed circuit from that point rather than the plenum fitting. Only then could you safely plug the coolant passage into the plenum.

Lots of opinions on this, but I know I am not the only one who feels blocking that passage is a bad idea. Your mileage may vary.

[Dynomite]

Originally Posted by tpepmeie

I wouldn't advise doing this,
Lots of opinions on this, but I know I am not the only one who feels blocking that passage is a bad idea. Your mileage may vary.

Always something
The air is flushed out of Injector housing manifolds and into top of radiator where the air meets the same path back to coolant reservoir as the TB coolant. The coolant flow through Injector housings flushes all air into the radiator. The small TB coolant passages are often blocked in any event by corrosion and scale.

It is assumed the air gets pushed out of the injector housing coolant manifolds on each side (equally) since they are higher than the radiator coolant line going back to the coolant expansion tank on passenger side (the highest point in the coolant system).

It appears that the water pump pressure and resulting coolant fow into each cylinder block (right and left) would be equal since the coolant flow is separated equally on the face of the front cover where the water pump is mounted. There are two holes of equal size that go into the front of each cylinder block (right and left) from the front cover. In other words, the coolant is not pushed from the water pump into a single flow after which the flow is divided but rather the coolant flow is divided at the impeller of the water pump.



If the water pump can pump 100 GPM (385 cubic inches/sec) through two ports (lets assume 1-1/4 inch diameter or 1.23 square inches cross section each port), the coolant velocity would be 156 in/sec or 13 ft/sec in each port. That is intuitively enough flow to prevent a bubble of air going the other way in that flow assuring all air is pushed out of the system.

So......you and others who feel I do not know what I am talking about have fun removing plenums

I am busy at moment putting my ZFdoc Black Label Trans in
my 95'

[Paul Workman]

Certainly making no claims to expertise, but with an ear to those who have blocked off (plugged) the coolant through the throttle bodies, I have not had issues attempting to fill the block, after having done so successfully several times now.

After discussing the issues and experiences with Marc and Cliff, my method amounts to lifting & tipping the front of the car up & leaning toward the left side just enough so the air collects on the right side. Then I remove the cover of the right side coolant tube and fill the block through that port. (It occurred to me there must be a reason for those covers. And, if not for removing air and/or topping off the coolant, why have them...was my thinking...)

As an aid to knowing it there is a significant amount of air left in the block after attempting to refill it, I collect the coolant I drained (w/o spilling any) and if it all goes back in, then I feel assured I don't have an air lock the block.

So far, so good. Your mileage may vary.

[Kevin]

Originally Posted by Dynomite

Always something
The air is flushed out of Injector housing manifolds and into top of radiator where the air meets the same path back to coolant reservoir as the TB coolant. The coolant flow through Injector housings flushes all air into the radiator. The small TB coolant passages are often blocked in any event by corrosion and scale.

So......you and others who feel I do not know what I am talking about have fun removing plenums

I am busy at moment putting my ZFdoc Black Label Trans in
my 95'

starts looking up plane tickets from where you are to me...

[tpepmeie]

Originally Posted by Paul Workman

Then I remove the cover of the right side coolant tube and fill the block through that port. (It occurred to me there must be a reason for those covers. And, if not for removing air and/or topping off the coolant, why have them...was my thinking...)

Hi Paul. I'm trying to visualize what you describe here as covers. I'm sure I'm just being slow, but can you help me understand what you're talking about?

[Dynomite]

Originally Posted by Kevin

starts looking up plane tickets from where you are to me...

My latest technique for refilling the LT5 with coolant (I have several workable techniques) is to let the ZR-1 sit on a level surface. I fill the coolant overflow under passenger side headlight 3/4 full.

1. I fill the black coolant reservoir next to passenger window with coolant until no bubbles appear.
2. I take vice grips and close off the coolant line to the overflow container under passenger headlight.
3. I blow into the black coolant reservoir pressurizing the coolant system. The coolant level goes down in the black coolant reservoir and air bubbles back from the radiator.
4. I do this several times until I get no more bubbles from the radiator.
5. I then start the engine and let it idle with hand on Injector Housing Coolant Manifolds. If they do not get warm within a minute (they always get warm so far), I would repeat the process one more time.

Then I take ZR-1 for a ride and rev it up to flush any remaining air from the coolant system. I refill the coolant overflow under passenger side headlight 2/3 full and recheck after each run and cool down of the LT5. All the air will be flushed out of the system after three runs and cool downs.

[LGAFF]

all you have to do is slowly fill it then put the coolant plugs in the ih when it breaches, so much drama

[Dynomite]

Originally Posted by LGAFF

all you have to do is slowly fill it then put the coolant plugs in the ih when it breaches, so much drama

What is "it"?
Coolant plugs in ih?

Originally Posted by Kevin

I'm so tired of fighting with this car.

This is dramatic.............cannot someone drive over to Kevin's and help him?

[Kevin]

Originally Posted by Dynomite

This is dramatic.............cannot someone drive over to Kevin's and help him?

had a discussion with my wife about the car today she's named it "that little bitch". She made the point that it hasn't run right in the 10 years we've been together for more then a few months.

[Dynomite]

Originally Posted by Kevin

had a discussion with my wife about the car today she's named it "that little bitch". She made the point that it hasn't run right in the 10 years we've been together for more then a few months.

But Kevin..........
It's not the car, it's the people - Doug Johnson

You need more people that can take a look at your car.........