silvertop 20v over heating

[deaf_rattle]

i have just about finished the silvertop 20v conversion into my Ae92 fxgt.
thing is, the car will run for about 2 mins, before the check engine light comes on and then the water temp gauge goes through the roof.

there is also frothing in the coolant system when this happens.

any suggestions?

cheers

[Hydra]

Did you fill it up correctly? What temp sender are you using? From memory the 20v one wont work with the AE92 dash?

[Draven]

does the check engine light come on before the temp starts to rise, or after?

and how fast does the temp rise? if it's markedly faster than a regular warm-up, I'd be rather concerned about the state of the headgasket

[STR8 2.8]

water pump might be cactus

[deaf_rattle]

i am using the ae101 sensors, but will swap those over tomorrow.
the gauge skyrockets about 20 seconds after the check engine light comes on.

I dont believe its a bhg yet, as the water isnt milky and the oil is still sweet.

anyway of checking to see if the water pump needs to be replaced?

thanks

[oldcorollas]

have you done a compression test? it is veyr possible the gasket has blown between a cylinder and the water jacket.. and have nothing to do with the oil.

[Dimmy]

i'd agree with oldcorollas, do a compression test

[TauhuTauhu]

yup, it might be the combustion chamber and the water slots inside....

i had tht too....u see frothing in the radiator

if it's not the gasket, it might be problem with your water piping

[Starfire]

Doesnt the silvertop flow it's coolant "backwards" when compared with other 4ag engines? Has the cooling system been hooked up correctly?

[takai]

Not technically "backwards" as such, but markedly different. I assume when you mean frothing in the coolant system you can see that through the rad cap, rather than through the block (xray eyes woot). As such you dont have to worry about what Starfire is getting at with the coolant not flowing past the thermostat and opening it, which i have seen happen a couple of times when doing these conversions.

If you are getting frothing in the coolant, i would be looking at the headgasket, a simple overheat will give you bubbling like it is on boil, but frothing takes an extra effort which is normally had through exhaust gasses in the coolant.

[limbo]

Try flushing out the coolant, there could be a clog in the system and put back plain water first to check for any rust buildup in the system.
I've never heard of a car that heats up that quick so i expect it will be the water pump

[Draven]

dude, at that low temp the thermostat will be closed tighter than a virgin's cooze, so a bare minimum of coolant should be flowing anyway, which makes me think there is probably another issue... I'm reasonably sure if you take your car to a rad place they can test for exhaust gases in your coolant, which could be an easy way to rule that out (very cheap, no replacing of parts).

[The Witzl]

water pump might be cactus

I think this is your answer. It is a VERY common occurence for 20V conversions to be done and have the water pump fail, only to cook your engine rather horrendously and require you to buy another engine.


Let me guess - you didn't change the water pump when you did the conversion??
(or worse still, someone else did the conversion for you)


Takai - i would also suggest that when this "engine cooking" happened, the head gasket went the way of the 7M.... thus giving the "frothing" coolant.

Remember what JP has said about a million times about his brother's 20V conversion ???

[deaf_rattle]

so would the throthing be a symptom of the bung water pump, or a symptom of the head gasket having blown because of a faulty pump?

cheers

[EldarO]

frothing of coolant = BHG

Temp skyrocketing could be the result of the temp sender (either stock or after market, im not familiar with 20 valves) placed on the radiator side of the thermostat, so when the engine heats up enough to open the thermo stat, hot water rushes to the temp sender, and thus your skyrocketing temp.

the coolant frothing means that water is actually circulating, unfortunatley this doesnt do much to either prove or disprove a bung water pump.

Sorry i cant help you any further champ.

Eldar.O.