Crankshaft Reconditioning

[Jim Allen]

Good read on crankshaft reconditioning.

JA

2 Stroke Crank Guide.pdf

 

[Mike Byer]

Site won't let me in

 

[Rick Reisinger]

Same here

 

[Jim Allen]

This is not a web site. It is a pdf paper & it should come up on the bottom left hand corner of your screen. Click on open to read or print the 20 page pdf.

JA

 

[Rudy Formanek]

Sorry, but it takes us to the web site and then tells us we are not members

 

[Jim Allen]

Sorry Rudy. I'll try to see if there is another way to show some of the fixtures used for single & multiple cylinder engines.

JA

 

[Terry Keeley]

Send it to me Jim & I'll post it so everyone can see it.

 

[Jim Allen]

I'm working on it Terry. I'm asking if I can take it from the site.

 

[lohring]

Try this:

2 Stroke Crank Guide.pdf

Lohring Miller

 

[Jim Allen]

Thanks Lohring. That definitely works!

JA

 

[D-7]

For this pressing/ repressing i use this reco dentalpress, bring 7,5 tons. I buy second hand for 80,-€. It´s strong enough for 15 CMB/picco + 26ccm Zenoah cranks.

Best on this press is the small size ! take a look on the beer (0,33L)

 

[Jim Allen]

Frank,

Its a nice looking unit, but at 7.5 tons it probably would be to low for the rebuilt crankshafts we are building. The reason is because all rebuilt crankshafts use an oversize crank pin. For example, the first rebuild of a .3937" (10 mm) crank pin is replaced with a.3942" pin. The second rebuild of this same crankshaft would use a .3948" crank pin. We use this same process for rebuilt crankshafts with 12 mm (.4724") crank pins. Rebuilt crankshafts use crank pins made of full hard M-2 steel, M-50 steel or AISI 52100 steel. We are using a 12 ton press for these rebuilds.

JA

 

[D-7]

for my projects is strong enough

 

[WillieMcCauley]

Good article Jim. Thank You

 

[Jim Allen]

Willie,

I use a different type of fixture to disassemble & assemble single cylinder crankshafts. After checking the crank pin hole's dimension from the crankshaft's center line & it's squareness to the crankshaft's center line, only identical parts are pressed together to make an assembly. The fixture shown can assemble crankshafts within .0005" total indicator run out, end to end, before truing.

Jim Allen