4.2 petrol boiling over after 5mins!!!

[Bloodyaussie]

For sure.... as stated Parksy probably did it as cheap as you could but he did all the work himself but it still probably cost him close to $1500 as you need a vrs Gasket set new head bolts as they are stretch to yield and oil and coolant and the head work.

[Dales300exc]

Head gasket. And drop your coolant mix back to 50/50 max. Any more and you loose heat transfer effectiveness.

[Parksy]

Including oil and coolant I think I paid about $1200 to do the job with a new head. I ordered the kit off eBay which included new bolts, all seals and gaskets and valves. Runs like a dream now.

[tiny]

Thanks fellas, i'm up for a new head then...
There goes the new rifle

[billyj]

sounds like a head, as mentioned check the plugs when mine failed at no6 there was a slight green tinge to that spark plug, you could also do an exhaust gas test on the cooling system. doing it yourself it will probly cost about $800-$1200 by the time you get the head checked/machined, a GENUINE head gasket, new head bolts, exhaust & intake manifold gaskets, from memory it takes around 4 hrs to strip and about 5-6 to re assemble set tappets flush oil etc


edit. if it has gone between no6 and the rear cooling ports check if the bolck is corroded at all, mine was corroded to the point i only had 1mm of gasket material + the soild fire ring which led to a repeat failure, solution was to have the ports in the head welded and epoxy the offending ports in the block, been running like that for about 25k kms now and sits on 82 deg all day even with a turbo bolted to the side of it

[billyj]

found a couple of pics that show the area im talking aboutepoxied.jpghead.jpg

[Dales300exc]

I wouldnt jump to the conclusion its a head. If you oil is still clean chances are the head isnt cracked. They normal mix oil and coolant if the heads cracked. Most wont even know theres a problem until the gas freezes up due to low water.

We just changed a gasket on my mates for the same issue, filling the overflow with water.

[Alitis007]

Is your viscous fan working ??

To get your head reconditioned it will roughly cost $1500 - $2000 depending on how much work your head needs, it might go a bit over that if you need a new casting or other hang ons like fan belts, hoses etc and generally includes a service and tune aswell