20v gets hot fast after start up, SOLVED. silly mistake

[Wanabe_Garage]

I recently changed my head gasket into an 0.8 mm metal head gasket, after puting the head together I set the cam timing following the timing marks then set the ign timing at 10degress without advance.

funny thing is that the engine gets real hot fast after about 20-30 seconds its already at 80degrees temp from dead cold on a 20degree day.


**** problem solved silly mistakes like not grounding the diagnostics to stop the timing advance i had the base ign timing wrong... this could have contributed to the engine getting hotter as i had this problem the first time i started my 20v

also, the wire from the temp sensors must have been grounding to give a reading that did not cool but only got hotter, also my referce the temp sensor for the fan was reading backwards so when the fan turned on at what i thought was 70 degrees or so only about 40degrees

boy is my face red

thanks everyone

[Dale]

Could one of the water galleries be blocked, or water hoses on the wrong way etc? air in the cooling system?

I doubt timing would be making it overheat so fast, a tooth out it wouldn't be real bad anyway.. and if you checked with a timing light and it's 10 degrees base timing them it's right (assuming that's what the motor is meant to be set to)

[30psi 4agte]

Was the gasket on the correct way ?? All the coolant galeries lined up on the block??

That is very fast for the temp to be rising!! Are you sure it is the actual temp ?? Ie it isnt a faulty gauge or temp sender ??

[nick.parker]

You cannot heat an engine that fast. I ran mine (4AGZE) 3 or 4 times at idle for a couple of minutes each time over a period of half an hour with no coolant line attached when I was doing work on the motor to check it. It doesn't heat up super quick.

[Jorrs]

that is very weird, im going with gauge not being accurate and a faulty coolant line ?

my 20valve driving around sits on 79 degrees and only moves up past 82 at high speeds in middle of summer.

[Wanabe_Garage]

10degrees base timing thats right.

well, if it was water blockage it would rise that fast. as i have had such a problem before.
i lined up the head gasket the right way im sure.

I think my senders are correct as ive got the fan to turn on at 70degrees atm and thats what the meter is telling me from the back of the head too.

detonation? im not sure how to know its happening....

am i saying detonation i mean pre-ignition

[wilbo666]

well, if it was water blockage it would rise that fast. as i have had such a problem before.

I tend to think along the lines of nick.parker....

I don't think it would be possible for it to raise that fast!

Anyone care to do the thermal modeling of it? Simply a basic model that involves the x litres of coolant and the mass of the block would suffice I think.

Also another way to think about it...an engine make how many kw at idle? Not many...lets say 2kW...so 2000W (about a kettle!)....

I think a kettle is more efficient than an engine....and I'm pretty sure a kettle would struggle to get the water to 80+degC in 30 sec...?



Cheers
Wilbo

[Wanabe_Garage]

hmmm... this is giving me some hope
ill suss it out

[merc-blue]

Was anything else changed apart form the head gasket? was this engine in the car and working before the gasket change?
There is somthing faulty in the temp sender/gauge,
Its damn near impossible for it to heat up that quick

[Jorrs]

is the water pump seized ?

[Wanabe_Garage]

everything was working fine before the water was begining to recieve oil
i changed into a metal head gasket

i changed the butterfly openings slightly...

umm... i dont have a convention water pump i have an ewp with controller but ive had that in forever

i noticed the trd head gasket had smaller holes to let water through
im also thinking maybe the pump is going to fast to effectivly disspurse heat

i dunno... ill be home soon... if problems persist ill post a video!

thaks for the help!

[Vios-GT_07]

does the car even idle properly and rev properly? if it's not then i'd be pointing at some ignition issues, namely ur cam timing marks.. did u replace the belt as well by any chance? just in case u have a belt that's longer / shorter by a tooth...

[merc-blue]

water moving to fast wont casue it to heat that quickly, do you have a IR thermometer or similar or sit a thermometer ontop the radiator if its not reading within a few degrees fo your guage theres somthing wrong,
what sort of EWP are you using, unless it pushes like 500LPM it wouldnt be casueing any problems,
the timing will be out slightly due to change in gasket thickness, (the reason adjustable gears were invented, for when teh block is decked/new gasket)
But that wouldnt cause that much heat that quickly,


I recently had a mustang heat up to 180degrees while cranking, somone forgot to put the earth straps on and it was earthing thought the capilary line causing it to head up quickly, but i assume your using a electric gauge not mechanical

[adamaw11]

Check that you havn't accidently welded the coolant temp guage to the exhaust manifold

Seriously, where is the temp guage reading from?, when idling touch that area, and decide whether there's any way that could possibly be 80 degrees.

[Wanabe_Garage]

yeah i put my finger in the radiator, i can handle it if its 80 degreees

I hope this is a silly mistake and the sensor is stuff or wiring gets groiunded accidently