angus67
Welder's penetrate deeper!!
dang. 50 miles on this engine.
Its a 1980 with 1.50 over top end, stock size headgasket, don't know if that matters, but....
When I rebuilt it, one of the pistons that came out of it had the pin break free, scarring the hell outta the cylinder, the rod shoving the piston up. I found aluminum sand throughout the engine. I sprayed it all out, re oiled every surface/passage, got it all cleaned out. Bought the 1.5 over kit from mikesxs came with pistons, rings cylinder block. I had a machine shop check to make sure the pistons, rings and cylinders were all going to play nice. all good there.
But I wonder if the valve guides could be the smoking reason? They seamed smooth, and tight when I installed new valves, had the valve seats cleaned up. Ive retorqued the head a couple times to 30ft/lbs, changed the oil a few times, new cam chain,
valves set at in-.004"ex-..006".
I think its the head gasket, so I will wrestle this motor back out, take a look, and while im in there replaceing the head gasket, I think I will do the guides too. do I need to have the valve seats recut? Ive seen 5twins picture of how to prevent head gasket blowby with sealer around the four outter head bolts, and the cam chain slot. Didn't do that on the rebuild. Will do it this time.
Part of the fun, right?
Its a 1980 with 1.50 over top end, stock size headgasket, don't know if that matters, but....
When I rebuilt it, one of the pistons that came out of it had the pin break free, scarring the hell outta the cylinder, the rod shoving the piston up. I found aluminum sand throughout the engine. I sprayed it all out, re oiled every surface/passage, got it all cleaned out. Bought the 1.5 over kit from mikesxs came with pistons, rings cylinder block. I had a machine shop check to make sure the pistons, rings and cylinders were all going to play nice. all good there.
But I wonder if the valve guides could be the smoking reason? They seamed smooth, and tight when I installed new valves, had the valve seats cleaned up. Ive retorqued the head a couple times to 30ft/lbs, changed the oil a few times, new cam chain,
valves set at in-.004"ex-..006".
I think its the head gasket, so I will wrestle this motor back out, take a look, and while im in there replaceing the head gasket, I think I will do the guides too. do I need to have the valve seats recut? Ive seen 5twins picture of how to prevent head gasket blowby with sealer around the four outter head bolts, and the cam chain slot. Didn't do that on the rebuild. Will do it this time.
Part of the fun, right?