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Post by glutton4punishment on May 13, 2013 5:32:38 GMT -6
Just to let you know, I've never taken apart an engine before. so for me, this is a big learning and exploring process!
so, I got off the head, the cylinder,and the piston head (HC&P). Remember, the problem was that as I rotated the engine, I would hit a spot of greater resistance, and then it would rotate easy once through the "friction zone".
With the HC&P off, I rotated the engine again. Hmmmmmm, same "friction zone". Looking at the the connecting rod as I rotate the engine (after I fished out the timing chain), the friction came as the connecting rod (CR) was coming out (kind of like when you stick out your tongue). So what I did was spray some WD40 right at the point where the CR is attached to the crankshaft.
Wow, BIG difference! No friction!
Now, before you ask, the engine oil level is full, according to the screw in plug. But there is ONE more interesting thing (for me).
When I rotate the engine, sometimes the cams on the crankshaft get a coating of oil on them, but sometimes not. When it does get oil on it, it only covers about half of the bottom of the cams.
Well, what do you think???
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Post by glutton4punishment on May 5, 2013 7:00:07 GMT -6
thanks for everything, very clear..now I need to find some time. Will report back with good news (I hope).
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Post by glutton4punishment on May 5, 2013 6:56:19 GMT -6
thanks for everything, very clear..now I need to find some time. Will report back with good news (I hope).
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Post by glutton4punishment on May 4, 2013 15:37:58 GMT -6
well, I wish my mind was as clean as that engine! So what's it mean, do I have to take off the head and take it to a shop or what?  ?? |
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Post by glutton4punishment on May 1, 2013 11:53:47 GMT -6
thanks for the replies!
I got it to revolve by spraying wd-40 in there. the motor oil is very clean.
The way my engine is laid out, the intake valve cover is on top, the exhaust on the bottom. for my sake, I hope the problem is from above.
I assume a dropped valve will look like it's not there or too low from the POV of the valve adjust nut?
thanks, anyway, I'll check it out ASAP.
BTW, I assume that
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Post by glutton4punishment on Apr 29, 2013 12:35:58 GMT -6
hi, gang.
I've got a 150cc water cooled sym joyride scooter as a "gift", DOA, around 43,000km.
At first, the engine was seized, but with a wrench to the thing that drives the variator, I got it to rotate.
It wouldn't start with the battery b/c it kept getting "stuck" in one place, i.e. the starter would turn the engine over, but that's all. The battery driven starter would work for a few seconds, hit a spot of high resistance, the engine wouldn't turn any more, and I would shut it off b/c of fear of burning up the starter.
So this is what I would like diagnosed: when I revolve the engine with the wrench, it spins pretty freely till I hit a certain spot. At that point, I have to apply a fair amount of force (let's say 3X the normal amount) to get the engine through the rough spot, and then it spins easily again till I hit "the zone".
Before I take it apart (I'm not really sure it's worth it, and that's a big part of why I'm asking here) what do you think is the problem?
Thanks a zillion.
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Post by glutton4punishment on Jul 25, 2012 11:34:09 GMT -6
 Hi, everybody. Before I joined, I did a lot of lurking, and you guys are the smartest around! Anyway, I've got a 2001 SYM Joyride 150 (I believe it's Taiwanese). It blows the main fuse when ign switch is turned on (before trying to start anything). Using a VOM (one lead attached to the frame), I've found that the wires that lead to the license plate light and the left turn signal are grounding out. To my great dismay, when I unplug the harness next to the rear lights, and unplug the harness next to the steering head, that the shorts are not in the lights themselves. (I am also getting a short from a black and white wire that goes to unit the CDI unit. I wish I could give more info on this wire, but the only wiring diagram I have is out of focus, and I can't attach it) i.e., the short is in the harness that goes along the frame to the steering head. When I test the harness, that is where the VOM beeps when . I've looked inside the front part of the scooter, and there doesn't seem to be any movement of anything against the harness. WHAT TO DO?? (I don't want to buy a new harness).
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