These are some dummie ideas but I have to throw them out there.
1. what is the coolant mix that you are using? is it 50/50 or is something else? too much coolant can cause an engine to over heat just the same as not enough coolant.
2. when you fill the cooling system with coolant are you following the direction per the repair manual? It mentions something about having the heater hose disconnected as you fill to remove any trapped air.
If it make you feel any better my brand new 170 is doing the same thing..
It ran well enough for me to break it in, but now it will idle (1200rpm) for 30 minutes then boil over.
I'm hoping the bad gas that I had was the problem. I still haven't gotten the gas tank installed after cleaning it and sealing it.
Nathan
Nathan and Jen Cooper
63 Sprint Hardtop "Dollora"
63 Super deluxe squire wagon "Mayble"
* this spot is vacant for future project*
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