1970harley shovelhead Iam rebuiding engine,there is a little play in back rod,why and how do i fix?Thanks,Sandi

Hi my name is Brandon I am mechanical n electrical engineering technician and 4 generation mechanic its a blessing by God! But tell you little bout what I do I am not a mechanic I am the man they call when reg... mechanics cant fix it and I need more information to be right on the money Sounds like the front baring are bad ill put money on it


Brandon,
Mechanical n electrical engineering technician
Email address is ([email protected])
I will get back to you asap soon I can
Thanks God bless you

Check your motor and tranny mounts. Also check your struts and shocks

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Repair Shop

I don't know of anyone that makes a special starter shaft and it souldn't be breaking like that. You may have one of two possible problems.

Check the support for outer end of the starter shaft. The original outer primary has a bearing in it that supports the far end to keep it from flexing when it turns the engine over. Your belt drive should should have a starter shaft support that bolts to the inner primary to support the starter shaft on the outside end. Check it for alignment and make sure it's firmly attached.

The other problem could what I call "kick back". This occurs when the engine fires on the first upstroke of the piston and it actually turns the engine backwards against the starter. Shovelheads with the stock ignition were notorious for this if the initial timing was a set just a little too high. You didn't mention what type of ignition you have. Some electronic ignitions have a selector switch that you can choose between "electric start" and "kick start". The "electric start" position delays the spark from occurring until the engine has turned over three times. This gets those heavy flywheels turning and the engine will not kick back when it fires for the first time.

Also, if you're problem is with the over running clutch or "Bendix" as some people call it, make sure you are using a very high quality unit. I've seen lots of the Chinese made units fail prematurely.

I hope this helps.

Good Luck
Steve

If you engien is knocking, it means usually that a rod bearing has given out and too much play exsists between it and the crankshaft. This can be repaired, by rebuilding the engine, depending on mileage and damage the crankshaft will probably have to be replaced. So even though it can be repaired it may be cheaper to install a new (rebuilt) engine, also should be a faster repair. Be choosey and select a quality shop.

Wont know till you take it to a mechanic for troubleshooting.