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Is it worth it a 743 and a 743b
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<blockquote data-quote="Tazza" data-source="post: 9096" data-attributes="member: 82"><p>743 and 743B are essentially the same. As far as i'm aware there are only very minor differences like electric fuel shut down solenoid and the hydro oil filter is on the opposite side. The engine is exactly the same and i assume the pumps and motors are as well.</p><p>If the engine over heated warping of the head is the least of your problems. When these engines over heat the first thing they do is crack the head. This generally goes un-noticed straight away and coolant seeps into a cylinder and when you go to start it up you bend a con-rod that in the worst case punches through the block (i bought a machine like this).</p><p>Do your sums, a replacement engine will run you 3-5K. A bare cylinder head will run you around $1500 then you need a head gasket and you are not assured the bore isn't worn either. The bore may have distorted with the heat too. Unless you have access to a cheap GOOD engine you need to work out if you want to risk $1500 on a head for an engine that may need a full re-build.</p><p>If it was started or if they tried to start it, a con-rod may have been bent slightly. You can do a quick check by rotating the engine around to make sure all 4 pistons reach the same height. As the head is off this will be an easy check. Make sure there are no scratches in the bore and feel the top of the bore, if you can feel a ridge, not just carbon build up you know the bore is worn. This section of the bore is not touched by the rings and is a good indication of wear if you don't have a bore gauge.</p><p>If you do want to risk it on the 743B i have worked on a few and i have all the details for re-assembly and wear specs.</p><p>Good luck on your decision.</p></blockquote><p></p>
[QUOTE="Tazza, post: 9096, member: 82"] 743 and 743B are essentially the same. As far as i'm aware there are only very minor differences like electric fuel shut down solenoid and the hydro oil filter is on the opposite side. The engine is exactly the same and i assume the pumps and motors are as well. If the engine over heated warping of the head is the least of your problems. When these engines over heat the first thing they do is crack the head. This generally goes un-noticed straight away and coolant seeps into a cylinder and when you go to start it up you bend a con-rod that in the worst case punches through the block (i bought a machine like this). Do your sums, a replacement engine will run you 3-5K. A bare cylinder head will run you around $1500 then you need a head gasket and you are not assured the bore isn't worn either. The bore may have distorted with the heat too. Unless you have access to a cheap GOOD engine you need to work out if you want to risk $1500 on a head for an engine that may need a full re-build. If it was started or if they tried to start it, a con-rod may have been bent slightly. You can do a quick check by rotating the engine around to make sure all 4 pistons reach the same height. As the head is off this will be an easy check. Make sure there are no scratches in the bore and feel the top of the bore, if you can feel a ridge, not just carbon build up you know the bore is worn. This section of the bore is not touched by the rings and is a good indication of wear if you don't have a bore gauge. If you do want to risk it on the 743B i have worked on a few and i have all the details for re-assembly and wear specs. Good luck on your decision. [/QUOTE]
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Is it worth it a 743 and a 743b
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