vn still overheating
hey got a dec89 VN commodore and i have changed the waterpump and thermostat and it still seems to overheat, the radiator looks fairly new in the car, so what else could it be? i noticed that i can see and hear water sizzling by the L/H rocker cover gasket (passengerside) so what could that possable mean? would it be cheaper to get another motor put in as i can get one for $1000 fitted?
cheers
Water at the rocker cover gasket? I don't think that's normal.
Are you constantly having to fill the water up in radiator at all?
yes i am now having to constantly fill it up, but theres no milky oil so thats where im getting confused. what could it be?
Well then there's a good chance that your head-gasket isn't blown.
What about your welsh plugs? Are any of those leaking?
i might just go out and have a look, where abouts are the welsh plugs located on the vn motors, i have the morot with the thermostat at the back of the motor
Donating Member
Inlet mainfold gasket is most likely culprit if you hear it leaking near rocker covers.
Originally Posted by Smidy
They're all over the place.
Yeah, you've got an S1 motor.
oh right, yeah i hear it and see it sizzling and its leaking at the top passengerside rockercover closest to the throttlebody end
Where?
Up the top near the manifold?
yeah up the top
where i have circled is the area where the water is leaking from
I'm not 100% sure, so anyone who know's otherwise, please correct me if I'm wrong, but there maybe a possibility that you manifold gaskets gone, and leaking water.
Donating Member
inlet mainfold gasket as i stated above
sorry this is gunna sound stupid but where is the manifold gasket and how hard is it to change?
also does the rockercovers have to come off? is it reasonable easy job to do? what has to come off do you know? and is the manifold gasket where the 3800 sit on top of ?
also would it cause it to overheat? as when it starts getting hot i can hear it bubble back into the overflow bottle, but when it cools down i still have to put a fair bit of water in it
Donating Member
no raocker covers dont need removing but changing manifold gaskets is a big job. Basically the whole manifold between the heads needs to come off. The gaskets that need replacing are between each head and the manifold. gasket set is about $30 and you'll need to drain cooling system, depressurize the fuel rail and disconnect the hoses at end of the rail all other obstructions removed. Theres about 8-10 bolts the need to come out and then whole manifold will lift off replace gaskety and rubber seal at front and back of block the install is reverse of removal
no worries, so do i just ask for a manifold gasket set or a water manifold gasket set?
also how do i depressureize the fuel rail? take the vaccuum hose off?
and would that still cause it to bubble watter backinto the overflow from radiator when hot?
Donating Member
ok ask for an inlet manifold set to suit vn s1 there might be 2 kits one will just be gaskets the other will have things like the thermostat housing gasket. get the bare kit. depressurising fuel rail is done by removing fuel pump fuse and cranking engine for a bit.
Yes it can overflow to bubble as pressure is forced back through cooling system
cool, thankyou for your help, much appreciated, now ill see if that fixes the problem hopefully
so the throttle body has to come off does it? also when i undo all bolts i can change both sides at the same time with the inlet manifold?
also here is a picture of the gasket set, what ae the 2 blue long thingd for?
Donating Member
you amy get away without taking tb and elbow off though it could give you more room. Yes change both side the other one likely on the way out. The blue things are the seal for front and back of block when you pull it off you'll see where they go
i should take a picture for you!! i got my manifold off ill be back
here u go a picture.. some1 could mark the picture on paint or something to show u where they all go.. i cant remember exactly what the gaskets are called
well i changed the manifold gasket put it all together now it has a loud hissing sound and reving high? what could that be?
what kind of hissing?? like water touching hot metal like ur extractors? firstly clean ur engine with degreaser so its easier to see where ur problem is its dirty as
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