COOLANT LEAK ON 4MIL CUB?

[SLOPOKE21]

so i got an 03 4mil cub with a chariot head. i got coolant leaking off of the nuts on the bottom of the engine right where the studs from the top case come through. this is my first time running a cool head and want to know if the o-rings could be leaking? i pulled the head off and the o-rings looked fine but im gonna put new ones in. is there anywhere else it could be coming from? i did just have the clutch cover off but i dont think that has anything to do with it. my plugs are wet with coolant and i can tell by the pistons that its been burning coolant. are the o-rings worth a damn or is it better to put some silicone in there to?

[locogato11283]

its gotta be coming from the head if its in the cylinder. maybe you pinched an oring during the install.

 

you did make sure your plugs are back in the bottom of the cylinders right? there are two plugs on each side.

[SLOPOKE21]

yeah i checked them when i installed the cylinders and they were all in there. whats the trick for getting the o-rings to stay in place when putting the head on?

[bansheesandrider]

yeah i checked them when i installed the cylinders and they were all in there. whats the trick for getting the o-rings to stay in place when putting the head on?

Vaseline or grease

[RadarRacing]

X2 on it comin from the head. Get a new set for $25 and be careful puttin it back together.

[dajogejr]

Something to think about.

Since you are going to have to have the cylinder off anyways, take the studs out, find some 800 to 1000 grit wet/dry sand paper and a flat surface.

 

Hit the deck of the cylinder and the head with the domes in it. Just lightly...figure 8, for 4-5 seconds.

Make sure the whole surface of the deck (top of cylinder) and head get scratched up...so you know they're flat and will seal.

 

I know you said the bottom...just something else to double check once you have it apart.

 

The pipe thread plugs on bottom need to be just past flush in the cylinder. I always use some thread sealant on mine...or RTV. Those are pretty coarse threads...

More a piece of mind thing.

 

I use RTV for the Orings in the head. I just put a dab on my fingers and put a thin/sticky coat on the whole Oring.

Put spark plugs in the domes so you have good handles when lowering the head onto the motor.

Edited February 26, 2010 by dajogejr

[sleeper06]

I was thinking base plugs myself under the cylinder

[SLOPOKE21]

I got everything apart and the plugs are still in. I got new gaskets put in and some silicone to make sure that it seals good.

[papa_smurf49319]

let us know how it went when ya finish.

[SLOPOKE21]

i got everything together and went to kick it and it started spewing coolant right out where the dome and the head meet. im about to give up with these o-rings.

[dajogejr]

Did you check the surface of the deck and the head/shell/domes for flatness?

Did the head go on pretty smooth or did you have to beat the bejesus out of it?

A bent stud can make installation a pain...and can make an oring fall out of the groove.

The outer edge Orings tend to walk out more on me because of the sharp bends...

Edited February 28, 2010 by dajogejr

[XxMeltIcexX]

If that head doesn't go on smooth it will not seal up correctly. O-rings are not your problem here unless they are worn. Make sure those rings are set in place before you seal it up.