How do you take the crankshaft of a suzuki fa50 apart?

Question

How do you take the crankshaft of a 1980s suzuki fa50 apart? Id assume that where the piston arm connects it would come apart but i don't know. Would someone with experience in taking these apart please shed some light on the situation?

Answer 1

Hi Corbet,,

Each "half" of the crankshaft assembly is pressed onto the CrankPin/Rod Journal.

To DIS-Assemble requires a Hydraulic Press and  Specifically sized & shaped Support  Plates to hold the crank as it's pressed apart.

1st,,,It's split apart into the 2 halves

2nd,,The Crank Pin which the Piston Rod & Bearing runs on is always left in 1 side  of the Crankshaft----So IT gets pressed out of it's crankshaft half.

3rd,,,After cleaning and inspection,, a New Crank Pin is Pressed into ONE Half of the crank.

---A New Rod and Bearing and Thrust Washers are installed onto the Crank Pin.

--- Then The Other Half of the Crank is put into position and Pressed onto the CrankPin

4th,,,The Entire assembly is then "Trued",,aligned so that the 2 Mainshafts stickin' out the side of the Crankshaft are straight and even,,,,and act as one single,continuous straight shaft when measured for run-out with precision instruments.

.........................................

The above procedure is Only a VERY BASIC  simplification of the procedure....just a general overview.

Crankshaft Rebuilding is considered  a "Specialty Operation,,,,it demands specific skills,,,,and  Certain Tools,Instruments / Facilities which are FAR beyond  what's typical of a "Mechanic's Tool Box".

It also really requires both Experience,,,and a "Knack" for doing it.

A Certain Touch which cannot be written or explained in an instruction manual.

Even  some people who DO rebuild crankshafts,,,,Really CAN'T.

No worth a phooey,anyway.

They can get them apart,,,they can get the new parts in place,,,and get the crank back together.

They can often get the crank back to running true enough.

But there's simply More to it than that,,,to get a reliable,durable crankshaft.

Your Best Bet is to find a reputable shop who will warrant their work,, and Pay the Man.

Or,,buy an entire new crankshaft--which is expensive.

.....................................

I'm 'bout the Last person to Discourage a Do-It-Yourselfer.

I'm not even particularly shy about encouraging someone to TRY,,,even when they really probably SHOULDNT,,,,IF they really Want To.

But on Cylinder Boring,,Cranshaft Rebuilds,,Extensive Head & Valve work on 4Strokes,,,things like that,,,

It's far better & easier to have it Proffesionally done by a reputable source.

The GOOD NEWS is that it's not very expensive to have a good shop rebuild the crank for you.

Should be under $50 labor,

and all-total with parts  Should be under $100.

About half the price of a New Crank

.........................................

Here's a Picture,,,Parts Diagram so ya can get an idea how things go

http://images.powersportsnetwork.com/fic...

REF# PART #REQ YOUR PRICE



  1-1 PISTON

12110-43000  1 $27.27





  1-2 PISTON SET (OS:0.5)

12100-35611-050  (replaces 12110-43000-050)  1 $41.28





  1-3 PISTON SET (OS:1.0)

12100-35611-100  (replaces 12110-43000-100)  1 $41.28





  2-1 RING SET, PISTON (STD)

12140-16B10   (replaces 12140-43000)  1 $12.42





  2-2 RING SET, PISTON (OS:0.5)

12140-46110-050  1 $12.85





  2-3 RING SET, PISTON (OS:1.0)

12140-46110-100  1 $12.85





  3 PIN, PISTON

12151-04700  1 $4.98





  4 CIRCLIP

09381-12001  2 $0.90





  5 BEARING (12X16X15.8)

09263-12023   (replaces 09263-12020)  1 $6.94





  6 CRANKSHAFT ASSY

12200-02201   (replaces 12200-02200)  1 $144.31





  7 .ROD, CONNECTING

12161-04001  1 $34.54





  8 .PIN,CRANK

12211-02300  1 $8.10





  9 .BEARING

09263-15014  1 $6.51





  12 .SPACER,LH

09180-20021  1 $5.28





  13 OIL SEAL, RH

09283-20034  1 $3.40





  14 OIL SEAL,LH

09283-26015  1 $4.08





  15 BEARING, COUNTER SHAFT RH

09262-20069   (replaces 09262-20062)  2 $12.74





  16 .BEARING

09262-12001  1 $10.10

Answer 2

the answer is no you can not take the crank apart. a shop has to do it.