That's very interesting indeed!  

What is effective torque of a starting motor?

Chris.

Wysłane z iPhone'a

Dnia May 7, 2012 o godz. 18:34 Ken Olsen <648.ken@GMAIL.COM> napisał(a):

>> I'm pretty baffled. My 85' Westfalia waterboxer has been turning over
>> slowly since I bought it several years ago, but it has finally got to the
>> point of stranding me. It is behaving like a low battery, but I think I
>> have ruled that out.
>> 
>> Symptoms:
>> Turns over very slowly, sometimes stopping (or catching?)
>> Runs fine when started.
>> Battery voltage looks good. Jumping doesn't help.
>> Voltage at starter matches battery.
>> Turns over slowly with:
>>   - spark plugs removed.
>>   - fresh battery jumpered directly to starter.
>>   - WITH NEW STARTER INSTALLED!
>> 
> 
> I'm thinking no one had the heart to break it to me. ITS THE MAIN BEARINGS!
> 
> I dropped the engine and vowed to keep removing bolts until I found the
> problem. It was taking about ~30 ft-lb to rotate the crank with spark-plugs
> out, and still 10 to 20ft-lb with pistons removed. When I split the case, it
> was quickly apparent the main bearing were in bad shape. I'm surprised this
> motor was running all and should be thankful it got it self home in one
> piece.
> 
> I am now the proud owner of a precision German jig-saw puzzle, complete with
> extra starter motor. Looks like a full rebuild is in order. Or, as my
> youngest daughter suggested, we could tow the van around to the back yard
> and make a playhouse / spare bedroom out of it.