CalG
Super Member
- Joined
- Sep 29, 2011
- Messages
- 7,843
- Location
- vermont
- Tractor
- Hurlimann 435, Fordson E27n, Bolens HT-23, Kubota B7200, Kubota B2601
So I got a hair growing, and pulled the Mac 10-10 automatic out from all the sawdust under the Oliver band saw.
It's likely sat there, or in the vacinity for over twenty years now. It was the first power saw I bought when I bought this place, and was soon replaced by a spanking new ProMac 10-10.
I gave it a look over, to make sure it had spark, that the fasteners on the carb and covers were snug, and that there was a good air filter in case it ran ;-)
Well, It did run! Started right up actually, after I swilled the junk out of the fuel tank and took the kink out of the fuel line.
The engine stalled when left to idle after maybe 15 seconds bouncing arond on the floor. High speed went from fat to lean in around 1/4 turn of the screw. I thought I was golden, so shut it down to fit a bar and fill the oil tank. As well as add a bit more fuel to the tank.
Well, after doing that, It would NOT start. It will hit a couple of times after a squirt of fuel down the carb throat. But popping only at dead idle with no added throttle. As soon as the trigger is pulled it dies, and it dies on it's own after just a few seconds after firing up. Seems like something changed and it's no longer getting fuel.
But it IS getting fuel! I've stripped the SDC-37A Walboro twice, looking for an "issue".
Sure the flex diaphrams are a bit saggy, but they are soft and pliable. I've seen worse running fine. The needle looks good, and the carb holds 15psi down to 9-10 psi over about 2 minutes. And each time I've opened up the carb it's full of fuel. I set the fuel screwa out 1 1/4 low and 1 turn High for starters. Maybe thats not right, but it was running on those settings +/-.
Compression is good, spark is bright, though the plug was wet when I pulled it before supper. Maybe it's flooded?
I'm thinking it may be the high speed check valve, but I don't know how to check that directly. I've pushed a fine wire through the needle screw hole, and squirted carb cleaner both ways into the space covered by the welch plug. No debris was noted that would go along with a clog or deteriorated check disc.
It ran well enough, then suddenly won't start.
The saw is on the bench, the carb installed again. I'm going around to a couple of shops tomorrow to see if I can get a carb kit.
Looking for ideas.
Boy is that saw LOUD!, and you should have seen the plug of dried bar oil I pulled from the oiler port! ;-)
It's likely sat there, or in the vacinity for over twenty years now. It was the first power saw I bought when I bought this place, and was soon replaced by a spanking new ProMac 10-10.
I gave it a look over, to make sure it had spark, that the fasteners on the carb and covers were snug, and that there was a good air filter in case it ran ;-)
Well, It did run! Started right up actually, after I swilled the junk out of the fuel tank and took the kink out of the fuel line.
The engine stalled when left to idle after maybe 15 seconds bouncing arond on the floor. High speed went from fat to lean in around 1/4 turn of the screw. I thought I was golden, so shut it down to fit a bar and fill the oil tank. As well as add a bit more fuel to the tank.
Well, after doing that, It would NOT start. It will hit a couple of times after a squirt of fuel down the carb throat. But popping only at dead idle with no added throttle. As soon as the trigger is pulled it dies, and it dies on it's own after just a few seconds after firing up. Seems like something changed and it's no longer getting fuel.
But it IS getting fuel! I've stripped the SDC-37A Walboro twice, looking for an "issue".
Sure the flex diaphrams are a bit saggy, but they are soft and pliable. I've seen worse running fine. The needle looks good, and the carb holds 15psi down to 9-10 psi over about 2 minutes. And each time I've opened up the carb it's full of fuel. I set the fuel screwa out 1 1/4 low and 1 turn High for starters. Maybe thats not right, but it was running on those settings +/-.
Compression is good, spark is bright, though the plug was wet when I pulled it before supper. Maybe it's flooded?
I'm thinking it may be the high speed check valve, but I don't know how to check that directly. I've pushed a fine wire through the needle screw hole, and squirted carb cleaner both ways into the space covered by the welch plug. No debris was noted that would go along with a clog or deteriorated check disc.
It ran well enough, then suddenly won't start.
The saw is on the bench, the carb installed again. I'm going around to a couple of shops tomorrow to see if I can get a carb kit.
Looking for ideas.
Boy is that saw LOUD!, and you should have seen the plug of dried bar oil I pulled from the oiler port! ;-)
