Lazy Starter

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  #1  
Old 07-15-05, 09:00 AM
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Lazy Starter

Old Craftsman tractor, Model number 917 254 820 with a 20 HP Onan B48G two cylinder engine. When starter is engaged, it slowly turns over once, then won't turn again until ignition is turned off and reengaged. Sometimes then it will turn over normally, but other times it will turn over once and stop again.
I tried directly jumping the starter from the installed battery. Same thing. I also directly jumped the starter from a fully charged outside battery. Same thing.
The only way I can get the starter to work is to hook up an external charger/booster. The starter turns over normally and the engine starts easily when I do this. The engine runs smoothly and well, but I don't dare shut it down unless I can reach it with a booster.
I've used Workaholic (Interstate Batteries) SP-30R CCA 290CA Heavy Duty Batteries that have always worked fine until this started happening a month or so ago.
My question is, do I need a stronger battery, or do I need to be looking at the starter to solve the problem?
Thanks in advance.
JCCremer
 
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  #2  
Old 07-15-05, 02:21 PM
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JCCremer,

This indeed does sound like your starter is giving up the fight. Being you tried a different battery this should eliminate the need for a new one. Also, as long as the battery you have has been working fine up until now there is no reason to have a higher ampere hour battery. It would only serve to finish your starter off faster; if indeed this be your problem. Make sure you check for any lose connections first. Also, if your battery is over 2 or more years old you most likely need a new one.

If this engine has overhead valves, I would try adjusting them first. If this engine has a lot of run time then they need adjusting anyway. The problem you describe can be due to valve timing so I would adjust those first. If this does not cure your problem and after a new battery, it's time to rebuild the starter for sure.

God Bless,
Dave
 
  #3  
Old 07-16-05, 02:39 AM
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I agree. It might be easy enough to just pull the starter, clean the internals, sand the copper contacts on the commutator and lube the bushings to freshen it up. If the brushes are badly worn, or the bushings (especially the drive end bushing), then replace them while you're in there. An automotive starter repair shop may well have the bushings and brushes if needed (or ones that can be altered to fit properly).

I also agree that the valve clearances can be the issue here. I think I would do the starter first if it was the easiest thing to access, or check the valve clearances first if they were the easiest to access. In either case, you won't be wasting your time becasue it would be a good idea to do BOTH anyway if they haven't had attention in a good long time.

This is all a.ssuming your battery is good, connections are clean and tight, and cables are in good shape.
 
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