Hey guys i have the 351 kit since the conversion i had problem with the coolant boiling over, i changed the head gasket and now i have oil going in the coolant ,could it be the seal between the water pump..help.. the bike is 09sf

 

Do you get any bubbles/pressure in the rad' overflow tank? If so then it's the head gasket again. The water pump seal will show some weeping at the very small hole under the pump cover if the seal is on the way out.

 

Unless the water pump seal is really bad, it's probably not the cause unless the transfer is occurring before the coolant is hot. When the coolant is hot it will be under greater pressure than the crankcase. If the seal is bad, coolant would pass into the crankcase, not the other way around.

Do you also have coolant in the oil? I'm guessing that's probably the case.

There aren't many places in the engine that oil and coolant can mix. The water pump seal is one. A leaking head gasket is another. Mating problems between the head and cylinder are a possibility.

If you have eliminated these possibilities and there is no physical damage (crack in water jacket, etc.), then the leakage must be occurring between the cylinder liner and the cylinder.

Good luck,
Ron

 

Thanks guys i think i could be left over oil from my head gasket failures i flush the system and now i see ... the bike runs good otherwise.

 

After a headgasket failed on my 350, I did a couple things that proved good. I used to add more torque to the headbolts on turbo engine when installing aftermarket metal headgaskets for added boost. Since the 350 headgasket is not stock, I did the same to crush the gasket better.

For my second install I added a procedure frequently seen in Toyota service manuals. First, grease and torque headbolts down to spec in two phases (15Nm then 46Nm). Then add anywhere from 1/10th to 1/4th additional turns while feeling for bolt stretch.

 

+1 on lubing the head bolts. The factory manuals on most engines recommend this to provide a true, smooth torque reading.

 

hey guys just an update
i change the water pump seals no luck .. i guess i'll have to send my cylinder back to Bill for check up.

 

i'm no expert but i have a question,,, do you have water in the oil as well?
seems to me that you would if the HG was blown.

 

Yeap this is my head gasket maybe there is a crac near a water passage Mr Blue will take a look at it .thanks

 

any luck on this one?