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#11
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!!VICTORY!! Running Again!
Well Guys-
I pulled the head, and found quite a bit of carbon build-up. I've seen much worse, but the ACR working on the exhaust valve side and the build-up around the seat of the intake valve must have been enough to prevent it from starting. I cleaned up all surfaces with the wizzer wheel, carefully chipped the carbon off the intake valve and around the valve seat, cleaned the head gasket mating surfaces, and put 'er back together. The valves and seats were fine other than the carbon build-up. I cranked her over dry a couple times, and the compression seemed much better, with no blowback through the carb. Put the fuel back to 'er, and she came to life. I think I'm gonna follow up with a new head gasket, and check the combustion chamber again after a couple hours' run time to see if the carbon is returning or not. Thanks to all for your input.
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Tom 105, 149 w/44A, #2 & #4 carts 782 CCC Red w/44C 1512 Smoker w/50C, 450 Blower 2072 w/60" Haban IH/Lawnboy 3322 Pusher, Scag TT 61" JD 455, X495, Kubota 2150, Gravely 450, 812 |
#12
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Glad to hear you're making progress. Don't forget to check the
head for flatness and sand it on a sheet of glass if necessary. |
#13
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sand it on a sheet of glass? come again? fiberglass?
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Tom 105, 149 w/44A, #2 & #4 carts 782 CCC Red w/44C 1512 Smoker w/50C, 450 Blower 2072 w/60" Haban IH/Lawnboy 3322 Pusher, Scag TT 61" JD 455, X495, Kubota 2150, Gravely 450, 812 |
#14
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Sorry that was so vague...I wasn't near a computer and was using my iPod to post.
Get a sheet of glass at least 1/4" thick and the size of a standard sheet of sandpaper. Get some 120 and 220 wet/dry sandpaper. First, set the head on the glass and see if you're 3-thou feeler gauge goes under it anywhere. If so, put the sandpaper on the glass and wet-sand the head starting with the 120 grit (I've started with 60 grit on really horrible heads and worked it up to 220 at the end) and finishing with the 220 after the entire gasket surface is shiny again. After you're done, the whole head will be almost perfectly flat. You shouldn't be able to get the 1-thou feeler gauge under it anywhere. Put it back together with a new head gasket and retorque after either 30 minutes at 3/4 throttle or the first hard pull, whichever comes first. |
#15
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I am having the same problem! I looked thru the carb and there IS a shiny spot showing all the time. I pulled the head off and, sure enough, one of the valves is not closing. I'm assuming this is the intake valve since it's the one I can see thru the carb. It's the larger of the two towards the rear of the motor. I don't see very much carbon at all, in fact it seems to be stopping before the top of the valve even begins to contact the surface. I pull off the breather assy and there's no obstructions there. I can't seem to figure out what's stopping it from closing. Is there another cause...any tips on what I should do next would be greatly appreciated!
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#16
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Quote:
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#17
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You're correct on all counts, J-mech. My post was pre-mature, the valve WAS stuck due to apparent carbon/gunk buildup in the valve guide. I shot some AC Delco heat valve lubricant down there, worked it up and down a bit, and got it to move properly. There's a bit of carbon both on the cylinder and valves. I'm sure I should clean it out before I re-assemble. Any tips on what to use/how to do it? I'm sure there are already threads here so I'm gonna search, but any links or comments would be appreciated.
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#18
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pull the side cover for the lifters off. use a spring compressor, compress the spring and remove the keepers. Pop the valve out (do both valves).
the valve can be cleaned on a bench grinder w/wire wheel. put some lapping compound on the seat, drop the valve back in, and lap it until you have a good seat (after lapping, the valve and seat should have a uniform mating ring). I like to tighten the lifter screw some before putting the valve and keeps back in. then follow IH instructions in the site archives to adjust the valve lash again. You'll find that its a piece of cake after you've done it once. Remember that the exhaust valve doesn't fully close when cranking it because of the compression release built in to the cam. Good luck. Oh, hehe. didn't notice the post date. I guess It's alittle late for my advice.
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Fly Fishing is not a sport...It's a way of life. |
#19
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OKay, so if I were to suspect my carb sucked up a screw. Is there any way to retrieve it short of dismantling the engine?
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Alan in Birdsboro, PA (OldPACubFan) 1972 model 149 - was my father-in-law's tractor 1973 model 149 - the first one I purchased Also have a QA36A snow thrower |
#20
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Pull the head is the only way.
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