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Post by heruk on Aug 28, 2014 16:37:48 GMT -6
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Post by heruk on Aug 28, 2014 16:44:27 GMT -6
yeah I could imagine the stress that goes along with being the administrator of a Technical Forum
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Post by heruk on Aug 28, 2014 17:14:58 GMT -6
my tensioner is noy adjustable like his. its spring-loaded yes but only closes and opens
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Post by Alleyoop on Aug 28, 2014 18:30:56 GMT -6
WOW, that valve is snapping shut!! can you take a close picture of the rocker arms just before the rocker arm snaps which is when it is just coming off the high spot on the cam. It will first push the valve down to open it then it will start to close as the rocker comes off the high spot on the cam. Did you buy that head with the springs and the rockers and cam or what came with it also a link to where you bought it as well. Alleyoop What motor is on there: look on the side of the case You may have a BN157 or a 1P57 motor and not the common 157qmj.  |
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Post by Bashan on Aug 28, 2014 18:55:20 GMT -6
That valve is hanging up after the lobe of the cam goes by. Then it snaps down on the lobe after the lobe tension is off and there's a gap for it to snap down on. It is normal for tension to build and it's harder to turn the crank as the lobe pushes the valve open. It is NOT normal for the valve to hang up and snap down on the lobe. That is a defective head in my opinion and it should be returned. There is something wrong with the valve guide, the spring, and/or the valve stem. Where did you get that POS? Rich
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Post by Deleted on Aug 28, 2014 19:05:34 GMT -6
That valve is hanging up after the lobe of the cam goes by. Then it snaps down on the lobe after the lobe tension is off and there's a gap for it to snap down on. It is normal for tension to build and it's harder to turn the crank as the lobe pushes the valve open. It is NOT normal for the valve to hang up and snap down on the lobe. That is a defective head in my opinion and it should be returned. There is something wrong with the valve guide, the spring, and/or the valve stem. Where did you get that POS? Rich I'm on my phone and can't see the vid but it's it possible the spring coils could be bunching up or hanging up on each other? |
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Post by Bashan on Aug 28, 2014 20:16:31 GMT -6
Could be, but what if the timing was off on the first few spins and it bent the valve a little? It would hang just like that. In any event, it's time to go back to GO and start over with a new head and valves. Sorry Heruk, unless you want to get a valve spring compressor and remove the retainers, a new head and valves is the best option. You can swear a little if you want. Rich
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Post by Alleyoop on Aug 28, 2014 20:42:46 GMT -6
Yep I suggest taking that head off and checking that valve by hand.
Alleyoop
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Post by cyborg on Aug 28, 2014 21:20:27 GMT -6
The valve is bent slightly or the valve stem is cut wrong with a taper and it's hanging up in the guide ,,, valves may have been set really wrong and on startup the piston touched the valve and bent it,,, take out the plug and check the piston crown if the piston has a smile on the top you will have a frown,,,put it back together and rotate it with the plug in you will hear the leak of the valve not sealing,, it'll hiss pretty good
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Post by heruk on Aug 28, 2014 22:03:06 GMT -6
it's a 157 qmj & it clicked before I even started the engine up.of course I rotated the fan and stuff as soon as I got the chain on. It clicked on the first rotation. I thought it was because the chain was tight but upon realizing that I missed the step of adjusting the tensioner I tended to that. I quickly realized that was not the problem.this video of me starting it was only the second time hitting the start button. I immediately unhooked the battery and spark plug after that video. the head came defective.it's just that top valve.
Ali I'll take a picture of the rocker arms for you in the morning when the Sun comes up.the camshafts high point Goes down but the rocker arms and the valve stay in place then at some random point (not really random) the valve pops up and makes that clicking noise.
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Post by Bashan on Aug 28, 2014 22:23:03 GMT -6
Yes Heruk, if it did that immediately it is not your fault and the part is defective. Send it back and get another one. I know this has been frustrating but this is the way it goes sometimes. Hang tough bud, get some new parts, and we'll get this puppy going. Rich
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Post by heruk on Sept 2, 2014 14:40:36 GMT -6
can the engine run without the dowels? I think that's what they're called. you know those little silver cylinders..one is stuck in the old cylinder he ad. I used penetrating oil and still not coming out
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Post by Bashan on Sept 2, 2014 15:08:18 GMT -6
They are "alignment dowels" and are there to make sure the parts are oriented like they should be during assembly. Once everything is torqued down they do nothing. If you have everything lined up properly you won't know they're not there. If the head or cylinder is off it will vibrate like crazy. Before anybody writes about this and tells me I'm a weiner, yes, it's always a good thing to assemble with the dowels and when you don't you're taking a chance. If you're lucky you won't know it's not there.  Rich
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Post by heruk on Sept 3, 2014 20:04:48 GMT -6
running better than before now. thanks guys. im going to have to get some new gaskets. i didnt put rtv on anything either. there was a copper ring that seemed to fit between the exhaust pipe and the engine. was it supposed to get rtv too?
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Post by Alleyoop on Sept 3, 2014 20:13:55 GMT -6
If that valve is still sticking and snapping something will break, either the valve stem or the rocker. If the Valve stem breaks your piston and head will be toast at the very least.
Alleyoop
That Happened to a guy on PROF I helped him through all his troubles and is up and running again:
Here is a Video of what happened when the valve stem broke, the valve actually got pushed out into the exhaust pipe.
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..BAD TO THE BONE..
Rich