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Is the sprocket on the camshaft supose to fit so bloody tight?

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DornTRoriginal

DornTRoriginal

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I am looking for some advice on how to correctly install the crankshaft sprocket. The workshop manual says to "slide the crankshaft sprocket onto the end of the crankshaft" but it does not "slide" I can only manage to get it to go on only slightly with a great deal of effort, this does not seem correct? I can not figure out why the sprocket on the crankshaft is fitting so tightly? I mean REALLY tight!

The crankshaft was nitrate hardened and I had the machine shop pull it off during disassembly, I thought it was just stuck from years of idle sitting but this may not be the case?

I don't recall any shims as described in the workshop manual being present and it seems that the sprockets will line up correctly but I am hesitant to use a lot of force to get the sprocket to slide onto the crankshaft and then have to pull it off if I have to add "packing washers"?

What do you think I should do? Does the sprocket need to be slightly honned by the machine shop? Do I get out the hammer and drive it home? Also, the new keys seem a bit "proud" as well do these need to be filed down a bit even though they appear to be the same size as the ones I removed and I am replacing with new ones purchased from TRF?

Any advise is appreciated! Thanks!
 
You're working on the crankshaft, not camshaft, correct? It's within the range of 'normal' to have to tap it into place, IMO. To remove, use a gear puller with a bolt threaded into the end of the crank (for the forcing screw to bear against). I had to pick up some coupling nuts to extend the legs of my cheap HF puller.
image_17610.jpg


But if it's more than a light drive fit, I'd do something to relieve the bore of the gear a bit. You won't need to remove very much, so some quality time with abrasive cloth might save a trip to the machine shop.

The key is also supposed to be a tight fit; I wouldn't file it down unless the gear starts to cut a shaving off of it.
 
Crankshaft Sprocket side (email pic).JPG

Yes, I am working on the crankshaft, I don't have a puller yet.... I will use some abrassive cloth and go slow. Thanks!
 
Got it on! YEA! thanks for the help!
 
The nitrite treatment of a crankshaft swells the molecular lattice (AS I Have been told) this makes it harder and
all machine work has to be re-checked to account for the increases in material.The machine shop might have caught this
if they had had their coffee......
MD(mad dog)
 
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