Should have done compression check
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Posted by Jimmy Walker on November 02, 1998 at 12:14:01:
I went out to start my 8N a few months ago and it
failed to start, so I tinkered with the carb for a
minute and it started. The next time I went to start
it, it would not start. This time I put new points and
condenser in it. It still would not start. I checked
for fire and I was getting fire. I rebuilt the carb
and it still would not start. I could pull it off
and it would start and run good, but it would not start.
I went to a tractor dealer in the area and he talked me
into rebuilding the motor, saying the compression rings
were worn. He said the the job would cost approximately
$1500 if no problems were found if they did it. It was
blowing back through the oil filler and you would
have to choke it even if it was hot to start it.
Instead of having it the motor rebuilt I decided to do it
myself. I did the whole thing,new sleeves, rings, new
pistons, valves springs and guides, main and rod bearings.
Once complete, I was ready to hear the first pop of
my rebuild engine, but there was no pop. I checked
everything and still no pop. I pulled it off and it
started and ran great, just like before. I could not
get it started with the starter even though I was getting
fire to every plug. I talked to several people including
the tractor dealer service department and they all
said it couldn't be the coil even though I suspected it. After
checking everything including the compression I bought a coil
anyway. Not only did I get a pop, it started up and is starting and
running great!
The story I am trying to convey is to check that
compression if someone says to rebuild the motor.
I am sure I wasn't far from rebuilding or replacing
the rings but I probably could have waited awhile
had I checked the compression. So there is such a
thing as a Weak coil.
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