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Discussion Starter · #1 ·
Hi all, I've gotta problem with my built FE3 weither it's normal or not I don't know for sure so I'll post it here. My coolant is slowly draining when I was street tuning. From full to min on the reservior coolant tank after about 8 runs. I'm guessing theres a leak somewhere in the head gasket ( Kia ). I'm using ARP studs and torqued at about 95lbs also double check the torque after breaking in engine and was off a bit. This was before street tuning. No sign of coolant leaks or smell. I just want an opinion before i do another head gasket job. Also boosting @17 lbs on pump 93

Thanks
 

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Discussion Starter · #5 ·
Engine - Mazda FE3
HG - Kia
ARP studs and nuts
Head was milled due to warpage

Stock 86mm bore just honed to seat new rings. Hopefully it's not a cracked wall. If i remember correctly i kept on adding coolant in the reservior when breaking in engine but drained very slow. Just didn't seem right to me until I was street tuning. Must be going somewhere. I'll do a compression test across the cylinders to see what numbers I'm getting. Any other ideas??
 

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or a cracked head. i just bought me a new head due to such problems.
cracked near the spark plug hole cilinder #4
 

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I'm not too sure on this but i'll suggest anyway..
If it's a cracked head, wouldn't there be a build up of coolant leaking into the oil causing it to mix into a milky residue (check in engine oil cap??)?
And also, if the head gasket is leaking then wouldn't there be oil leaking into the coolant causing a milky build up in the cooling system (radiator, overflow bottle etc..)?
I guess whether the oil leaks in to the cooling system or vice versa would depend on which has higher pressure.

i have a similar problem with mine where i recently had the head machined and rebuilt due to warpage. i also lose coolant very slowly but i think it's due to too much pressure pushing the coolant out of the overflow bottle. I'm' not sure what's causing this.
The onfusing thing is that it doesn't always leak, sometime is does and other times it won't.
My oil isn't milky so i know there's no mixture between oil and coolant.

if you have a look at the photos i posted in the gallery you can actually see a small puddle on the corner.
http://www.mx6.com/forums/gallery/216390-new-cai-addition-plus-car-photos.html
 

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If you aren't 110% certain that your rad cap is in perfect shape you should replace it with a genuine OEM mazda or nissan one. Without pressure the cooling system can NOT function properly.

Fred.
 
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