G16 Crankshaft Size???

[ianders]

Once again, I am relaying a message to you guys from my mechanic, so take it easy on me. Just rebuilt the engine on my G16, drive it for a bout 30 minutes and the connecting rod is now broken. Mechanic thinks the governor has been bypasses (it was running about 28 MPH) and that is what broke the rod. He has "miced" the crankshaft rod and the measurement is 1.411". He wants to compare this to the stock crankshaft to see if we can reuse the one that we have. Does anyone know what the stock dimension should be? What about the rod? Do they make different size rods?

[smallblock450sl]

Originally Posted by ianders

Once again, I am relaying a message to you guys from my mechanic, so take it easy on me. Just rebuilt the engine on my G16, drive it for a bout 30 minutes and the connecting rod is now broken. Mechanic thinks the governor has been bypasses (it was running about 28 MPH) and that is what broke the rod. He has "miced" the crankshaft rod and the measurement is 1.411". He wants to compare this to the stock crankshaft to see if we can reuse the one that we have. Does anyone know what the stock dimension should be? What about the rod? Do they make different size rods?

Service manual calls for "crank pin outside diameter"-(1.4161 to 1.4165 in) with a crank pin round or taper limit at (0.0012 in), no rod specs other then "plastigauge", with rod cap bolts at 14 ft lbs should read (0.0006 to 0.004 in), with a limit @ (0.004). Rods are cheap, cranks are not. No they don't have differant rods. Hope this helped.

[Flintrock]

Originally Posted by smallblock450sl

Service manual calls for "crank pin outside diameter"-(1.4161 to 1.4165 in) with a crank pin round or taper limit at (0.0012 in), no rod specs other then "plastigauge", with rod cap bolts at 14 ft lbs should read (0.0006 to 0.004 in), with a limit @ (0.004). Rods are cheap, cranks are not. No they don't have differant rods. Hope this helped.

That's a lot better than my "smaller than a breadbasket" reply......

[ianders]

It looks like my shaft is about 0.005 smaller than it should be (that just sounds strange). Is 0.005 within tolerance? If not is there anything I can do to keep from replacing a shaft?

[smallblock450sl]

I have to recomend a new crank and rod.

[smallblock450sl]

Originally Posted by Flintrock

That's a lot better than my "smaller than a breadbasket" reply......

But....did you sleep at a "Holiday Inn" last night? Got those gaskets and accelerator cable yet? Members, or me , want to know.

[Flintrock]

Dang Dave, you got a hell of a memory for all my faults and to-do lists...are you related to my wife????

I'll update soon, I promise...

[peter196358]

Originally Posted by ianders

Once again, I am relaying a message to you guys from my mechanic, so take it easy on me. Just rebuilt the engine on my G16, drive it for a bout 30 minutes and the connecting rod is now broken. Mechanic thinks the governor has been bypasses (it was running about 28 MPH) and that is what broke the rod. He has "miced" the crankshaft rod and the measurement is 1.411". He wants to compare this to the stock crankshaft to see if we can reuse the one that we have. Does anyone know what the stock dimension should be? What about the rod? Do they make different size rods?

1.4161 to 1.4165 in . is stock crankshaft size .Crankshaft was under spec . must of had a knock from very first start up .