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LT12H resto and re-build


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#46 aevansgatech OFFLINE  

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Posted May 17, 2015 - 08:55 AM

Thanks for the link Gabriel! So does that mean the bushing alone acts as the 'bearing'?

It's on my to do list today to get the flywheel off
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#47 Gabriel OFFLINE  

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Posted May 17, 2015 - 10:10 PM

Thanks for the link Gabriel! So does that mean the bushing alone acts as the 'bearing'?

It's on my to do list today to get the flywheel off

Your welcome. Yes, the bushing is the "bearing". I think it is technically called a sleeve bearing.

 

Did you get your flywheel off? Does the crankshaft turn easier with it off?



#48 aevansgatech OFFLINE  

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Posted May 18, 2015 - 09:35 AM

Well, I decided to put the bottom end back together before flipping the engine over to work on the flywheel, and it's actually freed up some after re-assembly. I'm debating even pulling the flywheel anymore because the restriction is definitely less

 

On a related, and not so good note though, Something is going on with the valves/camshaft alignment. The engine turns fairly freely now, but the valves aren't lifting. The gears meshed nicely and timing marks were aligned before I put the crankcase back on, but the valves don't lift anymore. I think it's time to take the valves completely out..



#49 Gabriel OFFLINE  

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Posted May 21, 2015 - 09:23 AM

On a related, and not so good note though, Something is going on with the valves/camshaft alignment. The engine turns fairly freely now, but the valves aren't lifting. The gears meshed nicely and timing marks were aligned before I put the crankcase back on, but the valves don't lift anymore. I think it's time to take the valves completely out..

Sure you didn't leave something out when you put things back together?



#50 aevansgatech OFFLINE  

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Posted May 21, 2015 - 01:37 PM

Haha valid point, but I don't think so. Nothing left on the table at least

To lift the valves I would need the crankshaft gear to turn the camshaft gear to turn the cam lobe to lift the tappet to lift the valve, correct?

The only thought I have now is that I'm spinning the crankshaft but the gear isn't spinning with it.
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#51 Gabriel OFFLINE  

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Posted May 22, 2015 - 08:32 AM

Haha valid point, but I don't think so. Nothing left on the table at least

To lift the valves I would need the crankshaft gear to turn the camshaft gear to turn the cam lobe to lift the tappet to lift the valve, correct?

 

Correct.



#52 Gabriel OFFLINE  

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Posted May 22, 2015 - 08:33 AM


The only thought I have now is that I'm spinning the crankshaft but the gear isn't spinning with it.

Sure you didn't leave out the key for the crankshaft gear?


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#53 aevansgatech OFFLINE  

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Posted May 22, 2015 - 09:32 AM

That's exactly what I'm thinking the little half moon that fell out could be

I just need to open up the crankcase again this weekend to have a look
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#54 aevansgatech OFFLINE  

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Posted May 24, 2015 - 10:08 PM

Now if I could just locate that tiny darned thing...

Extensive search begins tomorrow in the garage
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#55 KennyP ONLINE  

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Posted May 25, 2015 - 05:43 AM

I think Ace Hardware has half moon keys. If yours is missing, get the width from the slot and a general length.



#56 aevansgatech OFFLINE  

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Posted May 25, 2015 - 11:59 AM

Ok got a crank key and put it in, but it's not clear to me how the oil slinger is held in place

ImageUploadedByTapatalk1432573108.186944.jpg

It's driven off the cam gear but it moves around a lot and eventually ends up like this if I turn the engine

ImageUploadedByTapatalk1432573171.378407.jpg

Edited by aevansgatech, May 25, 2015 - 01:32 PM.


#57 aevansgatech OFFLINE  

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Posted June 21, 2015 - 07:56 PM

It was a fairly eventful day with the LT12H 

 

I finally got everything moving properly and re-assembled. There was a problem in the alignment where the exhaust cam lobe was touching the connecting rod and preventing the entire thing from moving. I got that sorted out and now I just have a mechanical/fluid starting issue

 

So, when I picked up this tractor, it was completely dead: turn key, no sound, no movement, nothing. I had to put in a new solenoid and key switch on the electrical side and do a complete teardown, cleaning, and re-assembly on the mechanical side.

 

Here's the current status:

http://youtu.be/CBY-dILZR94

 

And puffing the air/fuel mixture without the air cleaner on:

http://youtu.be/RWnpW4SBGuc

 

 

It seems like it's getting too much fuel and flooding the carb. It is also puffing that mixture into the air cleaner/filter and you can see excess fuel dripping out. Any ideas?


Edited by aevansgatech, June 21, 2015 - 07:58 PM.


#58 FixItCharlie OFFLINE  

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Posted June 22, 2015 - 08:37 PM

It looks like that carburetor has a float bowl, so check float level also make sure the needle & seat are closing to stop fuel flow.

 

Charlie   



#59 aevansgatech OFFLINE  

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Posted June 23, 2015 - 08:28 AM

So how can I tell the float level is good?

When I have the bowl off, the float seems free to move

#60 FixItCharlie OFFLINE  

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Posted June 23, 2015 - 04:50 PM

When you push the float up where it stop is the level. I am not sure what that level should be but if you have the manual for that motor it should show what that level should be. On top of the float should be a tab & a small part with a point on one end this will be the needle. It should go into the opening that the fuel flows from. Make sure you do not lose that piece but carb kits do contain replacements for this as they do wear over time. This video may help some. https://www.youtube....h?v=Ff2TeN9c5D0

 

Charlie






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