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Thread: re-carbed, and now over heating? engine degreaser? water pump fail?

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    Default re-carbed, and now over heating? engine degreaser? water pump fail?

    hey fellas,

    I just finished putting Therputic Z Carbs on my 71 240 the other day...cranked right up but engine began smoking so I shut it down.

    I've put a lot of time into engine degreaser and wiping it off with a rag (not hosing off) all over the block / engine compartment. in some cases it has air dried in hard to reach spaces...

    I did forget to re-add cooling system fluid that I lost during carb removal...it took about the entire upper portion of the radiator to fill back up.

    engine began smoking again after restart , also ruptured the thermostat housing gasket which began leaking coolant...

    I tested the thermostat and it opened very slowly in boiling water, but ran motor without it after replacing gaskets. Seemed to work for the brief time I ran it but did not verify with a long time of running at idle.

    today I put a new thermostat in (180degree?) and filled cooling system back up, even jacking up the front end two feet...but motor started to smoke (white coming off the block)...I shut it down and felt the thermostat cover but it was cool...top of radiator cool.

    I let it set for a few minutes and restarted until it smoked a little then shut it down....I was hoping to bump the temp up little by little to get the thermostat to open and I believe that has happened, being how the top pf the radiator got warm.

    Is that the best indicator the thermostat has opened?

    Is the engine degreaser partially to blame for white smoke coming from areas on motor? (not exhaust)

    the engine temperature gauge initially did not even read warm when I overheated the motor... but today with the three brief periods of running the motor ( two minutes?) I got the gauge to read a quarter inch under half way point. top of radiator was warm.

    what's the pressure I should feel on the upper radiator hose? it felt warm but not much more pressure than when engine off...

    there's no pulley fan, and the electric fan has never worked to my knowledge, but the Z ran fine prior to the carb exchange, and I've tested the electric fan by a straight battery connection so it will work...but currently I'm worried if thermostat is taking too long to open while rest of motor is burning off degreaser or melting...

    also I have yet to tune the new Ztherapy carbs...so could they be running too lean at first?
    Last edited by bounce; 08-17-2011 at 01:05 PM.

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    I will remove radiator cap, turn on heater and run zee Z with front jacked up this afternoon to purge air if there is any.

    still would like input on pressure / resistance to squeezing on upper radiator hose with thermostat open/ closed. ?

    I'll check oil to see if I put water into it now that I've overheated at least once (when thermostat gasket failed)

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    Registered User Zforce's Avatar
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    How can you be sure the engine was overheating ? did the radiator boil over ? If you put engine degreaser on the motor that will certainly cause smoking but only for a few seconds till it burns off. Did you just replace the carbs or the whole intake ? does your intake manifold circulate water though the carbs or just the intake ? Not sure I understand what sqweezing the radiator hose is going to do besides burning your skin off.
    1971 240Z hls30-17121 L28/E-31 SU's "B" 4-speed 3:70 gears.

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    Registered User olzed's Avatar
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    The symptoms you mention (cold radiator and hot engine).
    sounds as though you have an air lock in your block.
    This is what I did, and it seemed to fix the problem.
    Loosen the hose clips on the hose that runs along the right side of the block, then start the engine. With
    engine idling, grasp the front hose clip area of the hose, and give it a few twists. You will probably see air
    bubbling from around the hose. don't forget to top up the radiator as you go, then tighten the hose clips.
    I have had to do this a couple of times after draining the water.
    The smoke you mention, at a guess, would be the degreaser burning off .
    Last edited by olzed; 08-17-2011 at 03:59 PM.

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    Quote Originally Posted by Zforce View Post
    How can you be sure the engine was overheating ? did the radiator boil over ? If you put engine degreaser on the motor that will certainly cause smoking but only for a few seconds till it burns off. Did you just replace the carbs or the whole intake ? does your intake manifold circulate water though the carbs or just the intake ? Not sure I understand what sqweezing the radiator hose is going to do besides burning your skin off.
    squeezing upper radiator hose to identify pressure / open thermostat.

    No I'm not sure the motor over heated...but when I was monitoring the smoke coming off the motor the thermostat housing gasket let go, spilling coolant.

    the degreaser I used was thick and goopy and did settle into areas where I suppose would take a little longer to burn off than normal?

    never boiled any water.

    I did the carb swap with Z Therapy...plus fuel bar. Intakes? I don't know...everything from the spacers was replaced. water does still circulate through the carbs.

    I'm thinking there was or still is an air lock...

    thanks for your response
    Last edited by bounce; 08-17-2011 at 04:12 PM.

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    Quote Originally Posted by olzed View Post
    The symptoms you mention (cold radiator and hot engine).
    sounds as though you have an air lock in your block.
    This is what I did, and it seemed to fix the problem.
    Loosen the hose clips on the hose that runs along the right side of the block, then start the engine. With
    engine idling, grasp the front hose clip area of the hose, and give it a few twists. You will probably see air
    bubbling from around the hose. don't forget to top up the radiator as you go, then tighten the hose clips.
    I have had to do this a couple of times after draining the water.
    The smoke you mention, at a guess, would be the degreaser burning off .
    loosen clips, twist hose so that it kinks on itself, squeezing itself? or is it supposed to rotate completely? I'm not understanding fully but I'll look at the hose today for sure...

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    So your definition of over heating the motor is smoke coming off the outside of the motor after cleaning it and not by gauge reading or boiling water/af coming out of the radiator?
    things will only bother you if you let them.

    82 280zxt 4 spd auto
    73 240z--lsd, cv axles
    short throw info

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    close enough I reckon, gauge never left the cold peg when I thought I smoked it.....when the thermostat housing gasket puked I thought for sure I was over heating...

    update: smoke dissipated eventually, never did/ could get any more water in the radiator.

    I eventually got the engine hot enough to push water out the top of the radiator with the cap off....put the lid on it and kept an eye on the temp gauge....

    turned on the electric fan and the gauge maintained the pictured reading below...even on test drive for half mile at 55mph..



    I don't recall it being this hot prior to the carb change..perhaps I'm still lean? I think overheating issue is over, false alarm, I'm a newb, scared and don't have money to make stupid mistake repairs...

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    whats that middle temp reading increment on the gauge supposed to be temp wise? 180?
    Last edited by bounce; 08-17-2011 at 07:24 PM.

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    Looks fine.
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


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    hooray!!!!!!!!!!

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    yay
    -72 240Z "Goldie"

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    Temp looks OK.
    Good you have it sorted.
    What I meant was to LOOSEN the clamps on the engine side hose, and with the engine running, move the hose around on its pipe stub, so that you burp out the air and some water, then tighten the clamps with the engine still running, and a water hose from your garden tap trickling into the radiator. Worked for me twice.
    Last edited by olzed; 08-18-2011 at 02:55 AM.

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    Registered User Hunter260Z's Avatar
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    My temp has never gotten to the halfway point on the gauge. The only time it's gotten close was when I was running app. 90mph for about 2 miles. The outside temp was app 92.I have replaced the water pump,radiator, so that could be why my Z runs a little cooler. I think you are running a little warm.
    Ray
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    Purchased 5/23/1974

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    The center line on the temp gauge is about 165 degrees.

    Bonzi Lon
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    Registered User Hunter260Z's Avatar
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    I'm running a 170F thermostat. 180F is standard.
    Ray
    1974 Datson 260Z
    RLS30-27748 Matching #'s
    L26 Stock w/72 Round Tops
    Interpart Front Spoiler
    Addco Front & Rear Sway Bars
    My Very First Car
    Purchased 5/23/1974

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