Rattling noise when rotating flywheel

[JimP2014]

The noise it was rattling that had to do with a belt guide that has been fixed.

So I took apart the cylinder head portion of the engine cleaned everything put in a new head gasket set the gap for the intake at 0.004 and for the exhaust 0.006.

I basically put the rest of the engine the top part of the engine together again check the oil.

Had difficulty starting at each time I had charge the battery back up so finally I got it going this time + first of all it runs at very high speed and it's running real erratically and it's making a lot of popping noise and then I shut it down.

Is this typical of a flywheel key ruined I did not take the flywheel off but maybe I need to take the flywheel off maybe something is wrong with the Gap for the intake or the exhaust valve or anything else anybody else can think of is to why this is going on I know it's a zoomed in video I wasn't planning on doing that but that's what happened.

Thanks,
Jim

 

[JimP2014]

So the latest is it runs so erratically as soon as you start the engine it seems like after ruling out the flywheel key it has to be a carburetor issue Or I messed up with the valve clearances but I'm including a picture of the flywheel and the key and based on what I see I'm going to say I'm 90% positive the flywheel key is okay but if somehow it's destroyed below what you can't see then it could be the flywheel key.

Jim

 

[bentrim]

A sheared flywheel key will change the ignition timing. It will not change the speed of the engine, if anything will make it no start, pop back thru the carburetor, or run very labored.
You had the carburetor off to remove the head, be sure the linkage is free and set in the right holes. Be sure the governor spring is hooked correctly and not stretched when in the slow position. You may also have to adjust the governor per the service manual.
FYI the choke if integrated with the throttle should be applied when the controol is pushed to the extrme position. If not that will make it hard to start. Also be aware those engines have a problem with the compression release. It is evident when the valves have too much clearance or if the valve are adjusted properly the engine will pause or stop when coming up on compression. If you suspect that may be the problem take the valve cover off and watch the lower valve while turning the engine over you should see a small movement and of course the full movement of the valves opening and closing. The compression release is part of the camshaft.

 

[JimP2014]

A sheared flywheel key will change the ignition timing. It will not change the speed of the engine, if anything will make it no start, pop back thru the carburetor, or run very labored.
You had the carburetor off to remove the head, be sure the linkage is free and set in the right holes. Be sure the governor spring is hooked correctly and not stretched when in the slow position. You may also have to adjust the governor per the service manual.
FYI the choke if integrated with the throttle should be applied when the controol is pushed to the extrme position. If not that will make it hard to start. Also be aware those engines have a problem with the compression release. It is evident when the valves have too much clearance or if the valve are adjusted properly the engine will pause or stop when coming up on compression. If you suspect that may be the problem take the valve cover off and watch the lower valve while turning the engine over you should see a small movement and of course the full movement of the valves opening and closing. The compression release is part of the camshaft.

Wow good points. I am on autopilot with this thing and not paying attention - Thanks!

"lower valve while turning the engine over you should see a small movement " <-- will check that out too.

One thing I failed to mention here was one of those head bolts ended up with a rounded hex head. So that I have coming today. Lower left bolt when facing engine. I have to see if that was causing a problem too. I was wondering if that bolt was slightly looser than the others, it was difficult to get it to 18.3 ft lbs. cuz it kept spinning with the torque wrench up near 16 I think.

I can say after doing this a million times it seems, I only remove two bolts from the intake manifold and move the entire carb assembly away from the engine. So I do not mess with those linkages at all. But will inspect them for sure.

Jim

 

[JimP2014]

Wow good points. I am on autopilot with this thing and not paying attention - Thanks!

"lower valve while turning the engine over you should see a small movement " <-- will check that out too.

One thing I failed to mention here was one of those head bolts ended up with a rounded hex head. So that I have coming today. Lower left bolt when facing engine. I have to see if that was causing a problem too. I was wondering if that bolt was slightly looser than the others, it was difficult to get it to 18.3 ft lbs. cuz it kept spinning with the torque wrench up near 16 I think.

I can say after doing this a million times it seems, I only remove two bolts from the intake manifold and move the entire carb assembly away from the engine. So I do not mess with those linkages at all. But will inspect them for sure.

Jim

So I checked all the linkages + they seem fine I took off the valve cover gasket the exhaust valve specifically that hex nut and that torx screw they were very loose so that means the exhaust valve was always open I guess and maybe that explains why the engine went into this high Rev situation but I tightened it down all correctly I got 0.007 in for the valve clearance everything's all tightened down but one thing I DId notice is that one portion during the rotation of the flywheel that rocker arm is shakes back and forth and I'm trying to upload a video but something happened where I can't but is that typical where if the rocker arm isn't in a situation where it's under tension during one specific part of the flywheel rotation it can be kind of loose even though nothing's falling off on either side? I'm going to try and upload the video again so you can see exactly what I mean

Thanks,
Jim

 

[JimP2014]

This is the video of that rocker arm shaking here is the video of the rocker arm shaking I'm not sure if when it's not under tension it should shake this violently?

 

[bentrim]

From the video it appears you have excessive clearence betweenn the valve stem and rocker arm. If the valves are adjusted properly there should be just a small movement of the rockers, the feeler gauge should eliminate any play.
By what I am referring to if you turn the engine over slowly the intake valve (bottom) as the piston is coming up on compression will lose all clearance and just open the valve slightly for a brief period this release just enough compression to allow the electric starter to spin the engine or on a rope start to pull the rope easily without pulling the whole mwer backwards.
If there is no small lift seen The adjustment is not right, but more than likely the compression release on the cam has failed, which is common for these engines

 

[JimP2014]

From the video it appears you have excessive clearence betweenn the valve stem and rocker arm. If the valves are adjusted properly there should be just a small movement of the rockers, the feeler gauge should eliminate any play.
By what I am referring to if you turn the engine over slowly the intake valve (bottom) as the piston is coming up on compression will lose all clearance and just open the valve slightly for a brief period this release just enough compression to allow the electric starter to spin the engine or on a rope start to pull the rope easily without pulling the whole mwer backwards.
If there is no small lift seen The adjustment is not right, but more than likely the compression release on the cam has failed, which is common for these engines

Bentrim I do know what you speak, and I was wondering that. A few years ago I watched a video by FNGuitar player ( something like that ) and he called it a bump.

I was trying to figure this out earlier. I had no conclusion either way. I am taking your instructions "outside" I am not getting it right now but I will.

Thanks,
Jim

 

[JimP2014]

I will make a video of this bump or non bump, I am leaning more towards no bump ( bad ) but I do not know for sure.

 

[JimP2014]

I will make a video of this bump or non bump, I am leaning more towards no bump ( bad ) but I do not know for sure.

One thing I forgot to ask am I focusing the video on where those springs are or on the other side where those push rods are?

Thanks,