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Post by sawnami on Jul 30, 2018 22:43:45 GMT -5
My little hotrod XL2 suddenly turned into a mosquito fogger. Looks like the original oil pump checkball spring on the left is a little worse for wear. Had all the NOS parts on hand to give the oil pump a complete rebuild.  |
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Post by jerseyhighlander on Jul 30, 2018 22:52:37 GMT -5
Yep, that'll do it.
Maybe I should bugger that spring on one of mine on purpose. Mosquitos are killin me this year. Like the seven plaques of Egypt around here.
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Deleted
Deleted Member
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Post by Deleted on Jul 30, 2018 23:09:11 GMT -5
Yep, that'll do it. Maybe I should bugger that spring on one of mine on purpose. Mosquitos are killin me this year. Like the seven plaques of Egypt around here. Try coconut oil, supposed to be better than anything you can buy. I don't know, I've never had a mosquito bite, they don't like my blood |
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Post by tjthechainsawmech on Jul 30, 2018 23:59:59 GMT -5
So you are saying it turned into a Mac for awhile? lol!
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Post by undee70ss on Jul 31, 2018 1:28:45 GMT -5
The diaphragm must have been leaking for bar oil to get into crankcase, unless the duckbill was bad also. Those are more of a oil regulator than a pump, as without pressure in oil tank, no oil will flow.
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Post by sawnami on Jul 31, 2018 6:57:16 GMT -5
The diaphragm must have been leaking for bar oil to get into crankcase, unless the duckbill was bad also. Those are more of a oil regulator than a pump, as without pressure in oil tank, no oil will flow. That's what I thought too but a duckbill, sintered bronze fitting, pump diaphragm and gaskets, diaphragm spring, and pump diaphragm cover (all NOS) didn't change a thing. |
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Post by 5terrysupersaws on Jul 31, 2018 16:07:07 GMT -5
That's odd that the " Angry Mosquito " turned on itself and became a fogger !!  ..and that replacing oiler components did not resolve the issue . The problem may be a leaking pump body,which can be pressure tested to verify. The Homelite Manual 5th edition.. page B40... has a test and repair procedure . Good luck with it ! |
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Post by sawnami on Jul 31, 2018 17:02:27 GMT -5
LOL 😂
Yep. It failed the pressure test which led me to pulling the pump body finding the damaged check ball spring.
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Post by 5terrysupersaws on Jul 31, 2018 17:27:45 GMT -5
It holds 5-8 psi pressure now ?...and still smokes...puzzling !
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Post by sawnami on Jul 31, 2018 18:48:46 GMT -5
It holds 5-8 psi pressure now ?...and still smokes...puzzling ! I have just now replaced the pump body and set the clearance, replaced the spring and ball and I'm letting the sealer at the outer end of the pump body set before testing the pressure after the repair. |
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Post by sawnami on Jul 31, 2018 20:39:34 GMT -5
Well, I'm putting it to rest for an undetermined time. No go on holding pressure. It may have have a crack in the engine case at the oiler. I may try to see if I can convert it to another type of system. It has gone through a "little" more stress than a stock saw Stock max RPM is 7000. This one will go a little more than that.  |
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Post by undee70ss on Jul 31, 2018 22:11:53 GMT -5
Bypass the diaphragm all together, go to pressure only, like the XL’s from late 70’s early 80’s. They tend to over oil, but the rpms that thing is turning, it won’t be a bad thing.
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Post by sawnami on Jul 31, 2018 23:18:54 GMT -5
Bypass the diaphragm all together, go to pressure only, like the XL’s from late 70’s early 80’s. They tend to over oil, but the rpms that thing is turning, it won’t be a bad thing. That's exactly what I was considering Greg. Pretty simple too. |
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Post by 5terrysupersaws on Jul 31, 2018 23:29:41 GMT -5
15803 RiPeMs is an impressive number !! ..must have a " couple " mods other than the 'stinger' pipe .  |
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Post by sawnami on Aug 1, 2018 5:47:02 GMT -5
15803 RiPeMs is an impressive number !! ..must have a " couple " mods other than the 'stinger' pipe . Yeah, it's a little different. It's all about achieving chain speed. |
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dynodave
Saw Builder
equal opportunity GEARHEAD
Posts: 246
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Post by dynodave on Aug 1, 2018 7:32:40 GMT -5
15803 RiPeMs is an impressive number !! ..must have a " couple " mods other than the 'stinger' pipe . Yeah, it's a little different. It's all about achieving chain speed. just thinking... Is this not a reed valve engine? To get to that indicated RPM, it would seem to be more likely the tach is measuring a double ignition spark trigger. All ignitions make multiple plug firings. I see it all the time on a scope hooked up to my distributor machine. If the plug gap was opened and the electrical kernal(energy) was adequately dissipated on the first firing there would be less energy for a second firing and the trigger rate for the tach might magically be cut in half.... |
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Post by sawnami on Aug 1, 2018 8:28:51 GMT -5
It is a reed valve engine. At high RPM, it's a turn your head, squint your eyes, grit your teeth RPM.
It always makes me think about a friend that broke his hand when he grenaded a McCulloch kart saw.
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