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730

J

JH

Member
what a day its been after rebuiling the engine in the ol 730 this winter doing the machine work making sure everything was in order what i got was noting but antifrezze an oil out one head exhaust port , all this after he head had been maged an pressure tested
 
are u talking about the injector it self or , the power cell nut , does the power cell has to be serviced also this really blows my mind case the actual head gasket was fine , after taking it back apart could it be the valve guides leaking i am open to all suggestions
 
I don't see how anything w/ the fuel cell will leak anti-freeze. Did you change sleeves? Check sleeve protrusion?
 
I have never actually taken the fuel cels appart so I don't know whats in there. My first tractor when I graduated from high school was a 930. I used it to plant the corn that year and when I was done I pulled it up to the barn to wash it. As I pulled up it started to blow water out the exhaust. I took it to the dealer and they said it was the fuel cel. Never had any problems after that. When I over hauled my 400 this winter and tried to start it the first time it sprayed water out the exhaust too. I remembered my 930 so I checked the fuel cel nuts and all of them were loose. I tightened them up and no more water out the exhaust. I'm wondering, if there is not suposed to be water there if I have a hole burned through the head and the fuel cel plugs it when tight? Just curious if I'm going to have more problems ahead.
 


If the powercell cap and body burn through they will allow the hot combustion gasses to eat right through the head. I have stressed many times on this forum that a valve and seat job is not a complete job on those powercell engines, remove the nut and outer cap on the leaky port and see what you've got, if the mating surfaces are eroded and not sealing perfectly you have got a real problem.

A complete head service would include removing the powercell bodies and caps and lapping the surfaces to a flat mirror finish to provide a perfect metal to metal seal. Remember, the combustion takes place in that small area and thousands of PSI are trapped there and metered out the small entrance hole to push the piston down, unlike the instant combustion of a direct injection engine which acts directly on the pistion.

Let me know what you find and we'll go from there, there is also the possibility you may have a crack in a port and the powercell is not at fault so let's not get ahead of ourselves.

mEl
 
mel thanks for your advice an what i found was it was cracked in both exhaust ports
 
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