QuestionFirst of all good morning(or evening), thank you in advance for your answer and excuse me for my English.I have a problem with fitting the crankshaft in the crankcases(Honda c50).(I will use the termin 'nests' meaning the place of the crankcases where the bearings of the crankshaft must enter).Well, the nest are a bit small so in order to fit the crankshaft in the crankcase(the bearings into the nests) I must hit the crankshaft with a hammer. But doing so, the bearings are a little bit ,let's say, 'destroyed' and the cranshaft has a small play(very small)but existable, which results vibrations. What can I do to fit the crankshaft into the crankcases whithout using a hammer? Should i warm the crankcases, and maybe freeze the crancshaft?
May be I should tell you that the problem appeared after 'reconstruction' of nests in specialized shop ofcourse, which had as a result the nests to become a little (very-very little) smaller.
AnswerHi Panagiotis,
Sounds as if the machine work is not in tolerances with the crankshaft.
If possible, have the machinist examine the work. Bring the crankshaft and bearings and show them the problem.
They should have had all the parts when work was performed.
You should not have to hammer the crankshaft into the journals (nests). Plain bearings sometimes have a tight fit with their mating journals, but not to the extent of hammering. The cranksaft should rest in the bearings nicely and float on a film of oil when in use.
Let me know the what you do and the outcome. Best of luck to you, Sir.
Respectfully,
Mark Shively
