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Another Crankshaft Pulley Question...

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Alan R

05-26-2006 07:34:47

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Still trying to figure out why no compression after a partial overhaul. Am attempting to pull the timing cover and check crank/cam timing. It's taken longer than I thought to find time for this and things have not gone very well so far (broken water pump and bent fan, long story, please don't ask). Now I'm ready to remove the timing cover, but can't get the pulley off the end of the crankshaft. Got the bolt off, but the (original)pulley won't move (except to bend). My FO-4 doesn't really provide much detail on this and didn't see much in the archives either. Isn't the pulley just keyed onto the shaft or is there some other fastener involved? The tractor is a 52 8N and the rope seals are new. Should I loosen the pan bolts to make it easier for the pulley to slide off? What am I missing? Thanks for any help or advice you can share.

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ZANE

05-26-2006 09:30:44

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Re: Another Crankshaft Pulley Question... in reply to Alan R, 05-26-2006 07:34:47

If you are an accomplished welder you can weld a length of small chain to the pulley center hub at the edge and then by tying the chain to something heavy you can snatch the pulley off without ruining it. Then you can cut and grind off the chain and weld and be good to go.

The rope seals are what is holding it because of the smaller diameter on the pulley where the seals run.

Zane

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Alan R

05-26-2006 10:39:52

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Re: Another Crankshaft Pulley Question... in reply to ZANE, 05-26-2006 09:30:44

Unfortunately, no welder available. Otherwise, sounds like a good plan. Thanks.

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Dell (WA)

05-26-2006 08:00:21

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Re: Another Crankshaft Pulley Question... in reply to Alan R, 05-26-2006 07:34:47

Alan..... ...after you remove the pulley crown-head bolt (150ft/lbs) there ain't 'nuttin' but ropeseal friction holding the sheetmetal pulley hub. Yes there is also a 1/2-moon key to keep the pulley hub from rotating on the end of the crankshaft; but that ain'tchur problem.

I ain't a big fan of the weaksister sheetmetal crankshaft pulley. Really flimzy. Modern replacement pulley is steel billet turned on a lathe..... ....Dell

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Alan R

05-26-2006 11:33:04

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Re: Another Crankshaft Pulley Question... in reply to Dell (WA), 05-26-2006 08:00:21

Thanks Dell. Although I've yet to hear this tractor run, I have noticed that the original pulley has a significant "wobble" to it as I hand crank the engine. I think I'll go ahead and replace it with the steel type while I have things apart. Wish there was a steel one on it now to facilitate removal.

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TheOldHokie

05-26-2006 07:53:55

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Re: Another Crankshaft Pulley Question... in reply to Alan R, 05-26-2006 07:34:47

It's just a snug fit (keyed) on the crank. Loosening the pan may help as new seals generate a fair amount of friction. Are you using a puller or some other (BF&I) method? The OEM stamped steel pulley isn't real robust especially when it comes to hammering/prying.

TOH

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Alan R

05-26-2006 08:03:03

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Re: Another Crankshaft Pulley Question... in reply to TheOldHokie, 05-26-2006 07:53:55

I've tried a large gear puller to no avail. Just bends the pulley. I suppose I'll try loosening the pan next. Looks like it's back to "spray, soak, try again" and repeat as necessary. What is BF&I? Brute Force and ??? or is it similar to BFH (Big F----- Hammer)? Thanks for the reply. I can't afford to break anything else. ; )

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TheOldHokie

05-26-2006 09:21:27

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Re: Another Crankshaft Pulley Question... in reply to Alan R, 05-26-2006 08:03:03

BF&I is/or was a standard shop floor practice at the shipyards when I was working for the Navy:

BF&I ==> Brute Force and Ignorance

Their standard unit of measure for a precision fit on the floor was an RCH. I made a practice of adopting that as the variable name in any CAD programs I wrote that required a delta for numerical comparisons, much to the dismay of some of my superiors. I cannot and will not translate that acronym in polite company. I suspect Dell may be able to provide a private translation via email...

TOH

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Alan R

05-26-2006 10:38:19

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Re: Another Crankshaft Pulley Question... in reply to TheOldHokie, 05-26-2006 09:21:27

Thanks. I am familiar with that particularly intimate unit of measurement, so no translation necessary.

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