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No luck getting the 1250 running


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#91 accidentalchild OFFLINE  

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Posted March 14, 2016 - 06:59 PM

I take it this has been bored over .030 . The carbon is coming off easily with a plastic bristled brush. I do see a scratch in the cylinder wall but cannot feel it with my finger, is this gonna be a problem?

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#92 accidentalchild OFFLINE  

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Posted March 14, 2016 - 07:03 PM

Carefully remove all traces of the old gasket from the block & head, being careful not to gouge the head or block.
 
Clean the carbon from the block, head, piston & valves.
 
I don't know which tools you have available.  ....A putty knife or gasket scraper will help.  ....Do not use a screwdriver ! ....."Scotch-Brite" type material can be used to polish the mating surface of the block, once all traces of the old gasket has been removed. 
 
With the piston all the way up, and both valves closed, clean the carbon & residue from the piston & tops of the valves.
 
The easiest way to clean the valves is with a wire brush.  ....Rotate the engine to get either valve fully raised.  ...Use the wire brush to "scrub" around the underside of the valve head, and valve seat.  .....Rotate the engine to fully raise the other valve, and do the same thing.
 
Having a source of compressed air makes it easy to blow debris off, and out of the head bolt holes.
 
If you see anywhere on the head where the gasket may not seal, you can flatten the head gasket sealing surface by laying a sheet of sandpaper on a flat surface (such as a piece of glass or kitchen counter) and rubbing the head on the sandpaper.  ...You can quickly tell if the head is flat by checking for a full, uniform pattern where the head gasket contacts the head.

I don't believe the valves are completely closed with the piston all the way up?

#93 accidentalchild OFFLINE  

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Posted March 14, 2016 - 07:05 PM

Here is a picture of the piston all the way up.

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#94 29 Chev ONLINE  

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Posted March 14, 2016 - 07:11 PM

If you look at the picture of the valve springs in post 77 the valve spring on the right does not appear to be centred on the valve - could just be distortion from the camera.  You may want to have a good look at it.


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#95 accidentalchild OFFLINE  

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Posted March 14, 2016 - 07:33 PM

This is fun lol. I hope easy oven cleaner is alright as it takes the the carbon off real easily.

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#96 accidentalchild OFFLINE  

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Posted March 14, 2016 - 07:46 PM

I see some carbon at the top of the cylinder wall.

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#97 accidentalchild OFFLINE  

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Posted March 14, 2016 - 08:14 PM

Ok so the exhaust valve is not opening.

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#98 accidentalchild OFFLINE  

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Posted March 14, 2016 - 08:22 PM

Ok so the exhaust valve is not opening.

ok just rotated the engine again and it opened wide up.

#99 MiCarl ONLINE  

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Posted March 14, 2016 - 08:25 PM

Ok so the exhaust valve is not opening.

 

Not at all?  They don't both open together.  If you turn the engine 1 revolution (in it's operating direction) from where it is now the exhaust valve should be opening or open.


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#100 accidentalchild OFFLINE  

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Posted March 14, 2016 - 08:52 PM

Not at all?  They don't both open together.  If you turn the engine 1 revolution (in it's operating direction) from where it is now the exhaust valve should be opening or open.

yea it opened perfectly on the second rotation. Inexperience guided my first post regarding the valve not opening.

#101 MiCarl ONLINE  

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Posted March 15, 2016 - 06:36 AM

Yeah, you posted your update while I was figuring out on my fingers and toes how far you'd have to turn it to get the exhaust valve open.

 

In the photo in post 96 I can see hone marks in the cylinder wall.  That's a good sign, they'd be gone if it wore a lot since the ring/piston job.


Edited by MiCarl, March 15, 2016 - 06:38 AM.

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#102 accidentalchild OFFLINE  

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Posted March 15, 2016 - 11:54 AM

I ordered the new head gasket and a carb kit for it yesterday so hopefully it starts after its all done. I did the points yesterday as well. I read in the manual about how to adjust the valves so I will probably check that out also.
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#103 accidentalchild OFFLINE  

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Posted March 17, 2016 - 07:58 PM

Well it's reassembly time! Wish me luck.

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#104 accidentalchild OFFLINE  

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Posted March 17, 2016 - 11:27 PM

It's back together, going to put my tools away before I try to start it.

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#105 accidentalchild OFFLINE  

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Posted March 18, 2016 - 12:05 AM

Still a no go. After about 25 tries and starting fluid and spark checking, nada. Starter generator sure is hot to the touch.




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