[Farmall] 1951 Cub won't start when very hot

[DBigdog]

Jim,
    You have covered all the common causes for non-starting in the cub 
engine.  Coil failure is most common and a new coil could still fail. 
However, before throwing parts at it, check for presence of a good spark 
when trying to start it hot.  If you still have a good hot spark then 
ignition is not an issue.  If your engine is getting hot enough to boil the 
coolant it is possible that you have valves sticking when the block is that 
hot.  A compression test when hot should tell you if that is the case or 
not.
    If you can start by verifying spark when hot we can decide which 
direction to head in troubleshooting.
I might also suggest that you check out www.farmallcub.com as there is lots 
of cub information available there as well as a very active online forum.

BD
----- Original Message ----- 
From: jimbon88 at aol.com
To: farmall at lists.antique-tractor.com
Sent: Monday, August 30, 2010 12:44 PM
Subject: [Farmall] 1951 Cub won't start when very hot




Hi Folks,

I've been lurking on this list for a while to learn about my Cub but have 
never written in.    Now I have a problem that I can't solve and would like 
to know if anyone has any suggestions.   My Cub starts right up when it is 
cold or hot, but after running it so hard that the coolant is boiling in the 
radiator and it is VERY hot, it won't start.   It turns over just fine so I 
don't think it's the starter.   I installed a new coil with no change. 
Then I thought it was a fuel vaporization problem, but I can smell gas at 
the exhaust pipe and choking it makes no difference.  I have a pertronix 
ignition in it now, but it acts the same as when I had the points ignition 
system were in it.    If I let the engine cool down for an hour, it starts 
right up as if nothing was wrong.   Does anyone have any other thoughts as 
to what might be causing this no-start condition?   Thanks for the help.

Jim Gearhart




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