extra antifreeze?

[jehay]

nytro turbo has about 300 ml more antifreeze in the overflow then the day before. So i ementy it and 100 km later another 250 ml in overflow. The antifreeze looks normal and so does the oil. What could be the problem sled seems to run fine. Only thing is i rolled it once over and the antifreeze overflow was full after that. So i put the antifreeze back into the rad. Maybe i have a air lock if so how do you get it unlocked? thanks

 

[Transporter]

It should suck it back in on its own.

 

[jehay]

It should suck it back in on its own.

but it should suck it back in when it is cool it is the next day and it still is high I have taken out 1 litre of antifreeze out of the overflow and it seems to keep coming in there but yet my rad is full

 

[#1Leaddog]

Antifreeze

My guess is blown head gasket.

 

[NM]

It is air pressure blowing past the gasket and into the cooling system. The air displaces the coolant and blows it past the cap into the overflow bottle. Keep your eye on it so you don't get an airlock and overheat the motor. We are trying to find better rad caps with higher rated pressure. A buddy just pressure tested his cap and it only held 11 lbs.

 

[sledheadd]

It is air pressure blowing past the gasket and into the cooling system. The air displaces the coolant and blows it past the cap into the overflow bottle. Keep your eye on it so you don't get an airlock and overheat the motor. We are trying to find better rad caps with higher rated pressure. A buddy just pressure tested his cap and it only held 11 lbs.

Good info Neil let us know when and where you find a cap.
I am on the search for one also.

 

[jehay]

so does this mean i have a blown head gasket or is it ok but just turn down the boost untill we find a better rad cap

 

[jehay]

It is air pressure blowing past the gasket and into the cooling system. The air displaces the coolant and blows it past the cap into the overflow bottle. Keep your eye on it so you don't get an airlock and overheat the motor. We are trying to find better rad caps with higher rated pressure. A buddy just pressure tested his cap and it only held 11 lbs.

if that was the case would you not find oil in your antifreeze there is nothing in mine?

 

[Polarisrocks]

I am having a similiar issue, three hard pull on a bigger hill and it emptied out the main and it spit out plug/cap on the overflow. I filled the bottle under the rad cap that morning and didnt touch the overflow it was plumb full. Whats the level supposed to be in the overflow bottle? Can boost be blowing by a gasket and resealing itself for a ride out down the trail to the truck?

 

[Motleyone]

Been there and had all these issues. If your resevoir cap is blowing off you have a head leak for sure. It takes some serious pressure to blow that sucker off so you definately have exhaust gases blowing through your head shim or gasket and into that closed coolant system, the pressure has to released somewhere. Head gaskets can be a funny thing, you really need to take care in installing them and then torquing the head down. It seems that every sled and every install has it's challenges. I torqued down a shim and 2 gaskets on an Impulse kit and we have ran it at 16lbs without an issue. I installed just a stock gasket on low comp pistons on my personal sled and it blew out twice on me at 16lbs. Under 5-10 lbs of boost no issues, under 10-16lbs it would blow out the resevoir cap everytime and the sled would overheat. I went to head studs and had a pro do the istall, no issues.

I am having a similiar issue, three hard pull on a bigger hill and it emptied out the main and it spit out plug/cap on the overflow. I filled the bottle under the rad cap that morning and didnt touch the overflow it was plumb full. Whats the level supposed to be in the overflow bottle? Can boost be blowing by a gasket and resealing itself for a ride out down the trail to the truck?

 

[NM]

so does this mean i have a blown head gasket or is it ok but just turn down the boost untill we find a better rad cap

You should probably turn your boost down for now. A higher pressure cap may not fix the problem, but it will probably help. Headstuds also help to about 18-19 lbs boost.

 

[Sapling-Thrasher]

My guess is blown head gasket.

We have a winner!! Ding ding ding!!



Been there and it sucks....

 

[jehay]

oh crap!I got to greedy with boost i guess. How big of job is it replacing head gasket how many hours? My mechanic at yamaha told me 7-8 hours engine has to come out?! Can a averge guy do this repair? Would head studs help to not blow the gasket?

 

[sledheadd]

oh crap!I got to greedy with boost i guess. How big of job is it replacing head gasket how many hours? My mechanic at yamaha told me 7-8 hours engine has to come out?! Can a averge guy do this repair? Would head studs help to not blow the gasket?

Head studs will help like NM said up to 18 - 19 lbs. I'm not sure if it can be done without removing the motor.

 

[NM]

oh crap!I got to greedy with boost i guess. How big of job is it replacing head gasket how many hours? My mechanic at yamaha told me 7-8 hours engine has to come out?! Can a averge guy do this repair? Would head studs help to not blow the gasket?

I'm pretty sure it's not the gasket. Turn the boost down and the problem goes away...that is not head gasket. For some reason the Nytro's are prone to bleeding air into the coolant system at higher boost. It can be fixed with more$$$$$$$$$$$, but we would like to try a higher pressure cap first.
My sled only did it one day at 22 lbs boost. If I run under 19 lbs then no problems. If the gasket was blown then the problem would always be their. The only gaskets I have seen blown on Nytro's were a result of overheating, which could have been a result of pushing out coolant and airlocking, so just keep an eye on it and turn down the boost.

 

[Motleyone]

You CAN do it yourself and you CAN do it with the motor in but I don't recommend it. The problem is on the Nytros the timing chain tensioner bolt is way down below on the back of the motor. You need to remove the back engine mount bolt then prop the motor forward as far as it will go just to get at the tensioner. The valve cover is a real pain in the *ss to get on because of the rubber gasket, don't seperate it from the valve cover if you can help it. If you are not familiar with timing adjustment then do not even attempt it. Off by one sprocket tooth is very bad, off by 2 and kiss your motor goodbye. You also need someone else there to help you most of the time. You have to crank the motor over to TDC and be sure everything is perfect. Once you release the tensioner you need to turn the motor over by hand a few times while keeping tension on top of the cam sprockets so that the chain does not jump after all your hard work. You also need to be very good at torquing bolts to spec and have very good tool to do so. A bad or slightly off tourque wrench will cause you issues down the road.

My advise is trust it to a pro.

oh crap!I got to greedy with boost i guess. How big of job is it replacing head gasket how many hours? My mechanic at yamaha told me 7-8 hours engine has to come out?! Can a averge guy do this repair? Would head studs help to not blow the gasket?

 

[jehay]

I'm pretty sure it's not the gasket. Turn the boost down and the problem goes away...that is not head gasket. For some reason the Nytro's are prone to bleeding air into the coolant system at higher boost. It can be fixed with more$$$$$$$$$$$, but we would like to try a higher pressure cap first.
My sled only did it one day at 22 lbs boost. If I run under 19 lbs then no problems. If the gasket was blown then the problem would always be their. The only gaskets I have seen blown on Nytro's were a result of overheating, which could have been a result of pushing out coolant and airlocking, so just keep an eye on it and turn down the boost.

yeh, you might have a point there i tested cooling system, first thing i did was pressure the system up to 12 psi then i started the sled for 10 mins the yamaha mech told me if it goes past 16 or so then it has a bad gasket because the conpresson of the engine is making it go high because of the bad gasket. So i started at 12 and it went up to 13-14 so that is ok.
Second test pressured the sytem up to 15 psi with engine off left for 10 -15 mins come back pressure is still the same!

 

[pylon]

who did the install on youre sled ? if youre running 17 pounds i take it youre running a head shim

 

[jehay]

who did the install on youre sled ? if youre running 17 pounds i take it youre running a head shim

oh yes head shim is in and straight 111 vp with bigger injectors it has lots of fuel for that boost got it install in a place called camrose cycle in central alberta. They did a ok job but if i was going to do it again it would be someone else (Like powderlites in bc)

 

[pylon]

i would check youre headbolts and make sure there to spec. i know of a few nytros that run 15 to 17 pounds and have no troubles . making sure the headbolts were touqued right was really stressed to me in the instructions on my turbo kit .that and i coated my gaskets in coppercoat