Husky K760 rebuild, New jug spark plug seat has pits that wont seal?? what to do?? I preasure tested with home made seals, Intake side wouldnt quite seal but pressure tested with soapy water around seals and gaskets while it had preasure in it ( although it would not hold pressure for required time) and found no other leaks. what should I do? try copper spark plug washer?, High temp gasket material or aerobic gasket eliminator?, pull the jug and lower the seat past the pits?, send the jug and kit Back?, it is a cross kit...
If the pits are real deep I'd send it back.
I put a little drop of oil on the threads of new spark plug. It aids in sealing in a new dry thread. A bit of red silicone in the pit first may help seal it too.
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If you have a timesert spark plug insert kit, that would fix it, as it resurfaces the crush seal ring area with a cutter.
The kits are expensive, ($160), but worth it if you do 10 or so a year like I do.
If you hang the saw upside down, it's possible to install an insert without removing the cylinder. You just have to be careful to get all the shavings out.
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As to the intake seal problem; make sure that you are aware that there are two intake designs. Feb 2013 they changed the air intake area of the intake ports and corresponding flange. They are wider, and if an old flange is installed on a newer cylinder, it wil leak, and vice versa.
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If you are having leak problems at the intake, make sure the bottom pivot flange isn't bent outward from somebody forcing it. It should be straight.
A light coating of WD40 on the face of the rubber sealing surface helps during assembly. If the surface is boogered up it needs to be replaced.
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One thing about the K760 that is a pain,
is that you can't inspect the crankshaft bearings because of the skirts on the counterweights block visual access to the bearings. The seals have to be pulled in order to see the bearings condition.
A simple looseness test doesn't always cut it.
Be wary of a bent crankshaft if you find a bad crank bearing. The clutch is so close to the belt cover that it's quite easy for a dropped saw to get a bent crank. That and other tools being throw on top of them in a truck can cause this too.
It makes them wobble.
At 9,200 rpm it doesn't take long to damage bearings, or the crank bearing pockets.