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I've got a 2005 Brute Force 750 that just had the main timing chain replaced (It broke) along with a couple valves (Bent). The engine work was done by my Mechanic but I removed & reinstalled the motor.

Put it all back together and it fired up nicely. I let it idle for a bit and pulled the dipstick to make sure I hade enough oil in it. Major pressure coming out of the crankcase, it was as if I had my hand in front of the exhaust! Tons of coolant in there as well!

The guy who rebuilt it is very good and I know I put it all back together correctly. He obviously missed something, anyone have any thoughts?

Thanks,

Pete

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Not only did you bend the valves i think you also had a piston with ring problems.  Also, did you replace the valve seals?  Could be getting blowby on the rings.  In regards to coolant in the crankcase i say there's a seal missing or an 

o ring broken somewhere.

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Coolant in the crankcase  sounds like a cracked block  or head to me; although if the head and block  have  water passages  between them  . it could be a head gasket  problem.  Rings and valve seals will  not  let  coolant into the  crankcase ,  but  a bad head gasket or cracked block or head will  let  pressure  and coolant into the crankcase.

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If there is coolant getting into the crank case you would probably have coolant and oil mixture and cause a milky result. If coolant is getting into teh combustion chanber, you'd have a good amount of white smoke when running. Either can be a head gasket, seal, or crack somewhere.

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On 3/21/2017 at 1:03 AM, davefrombc said:

Coolant in the crankcase  sounds like a cracked block  or head to me; although if the head and block  have  water passages  between them  . it could be a head gasket  problem.  Rings and valve seals will  not  let  coolant into the  crankcase ,  but  a bad head gasket or cracked block or head will  let  pressure  and coolant into the crankcase.

a missing seal or broken o ring in the coolant passage will also let coolant into the crankcase.

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On 3/21/2017 at 1:03 AM, davefrombc said:

Coolant in the crankcase  sounds like a cracked block  or head to me; although if the head and block  have  water passages  between them  . it could be a head gasket  problem.  Rings and valve seals will  not  let  coolant into the  crankcase ,  but  a bad head gasket or cracked block or head will  let  pressure  and coolant into the crankcase.

i never said valve seals will let coolant into the crankcase i simply asked a question re the valve seals as were they replaced.  Blowby comes from a broken or worn rings and usually when a valve job is done valve seals should be replaced. a broken gasket anywhere in the coolant train will allow it to gather up in the sump.

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