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Old Red (ME)
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Joined: 04 Nov 2012
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 Posted: Sun Nov 04, 2012 5:14 pm Post subject: Crankshaft Pulley |
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Getting ready to install a new crankshaft pulley on my 8N engine. The engine is on an engine stand and the camshart cover and oil pan are removed so there is plenty of working room. It looks as if it's going to be a real tight fit. I probably can "pull" it on using a 5/8 NF bolt and spacers. My question is: would I gain anything by heating the pulley to ease the installation? And if so how much heat? The new pulley is a solid metal one (not sheet metal). Any suggesttions or ideas would be greatly appreciated. Thanks
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TheOldHokie
Tractor Guru
Joined: 08 Apr 2005
Posts: 5914
Location: Myersville, MD
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| Posted: Sun Nov 04, 2012 5:48 pm Post subject: Re: Crankshaft Pulley |
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| Old Red (ME) wrote: | | (quoted from post at 21:14:03 11/04/12) Getting ready to install a new crankshaft pulley on my 8N engine. The engine is on an engine stand and the camshart cover and oil pan are removed so there is plenty of working room. It looks as if it's going to be a real tight fit. I probably can "pull" it on using a 5/8 NF bolt and spacers. My question is: would I gain anything by heating the pulley to ease the installation? And if so how much heat? The new pulley is a solid metal one (not sheet metal). Any suggesttions or ideas would be greatly appreciated. Thanks |
The afternmarket pulleys are a bit tight - I just had a customer ruin his trying to "pull it off" after he "pulled it on". I suggest a light honing of the bore to open it up a few thou. Be careful - you don't want it sloppy.
TOH
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Tom N MS
Tractor Guru
Joined: 30 Jul 2007
Posts: 4479
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| Posted: Sun Nov 04, 2012 6:52 pm Post subject: Re: Crankshaft Pulley |
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The replacement pulleys are too small-- the sellers know it and don"t tell you--my Dad and I will always have shorter fingers because we had to sand and sand and rub and sand some more to get one of the defective pulleys installed on a weekend on his 2N.More Chinese junk--seller buys em cheap and sells em as if they are good replacement parts.
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carolina don
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Joined: 25 Apr 2012
Posts: 26
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| Posted: Tue Nov 06, 2012 9:28 am Post subject: Re: Crankshaft Pulley |
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Dan....according to my prints...the crankshaft should be 1.865 to an undersize of 1.855.I have attempted to measure the I.D.'s of the three pulleys that we sell with a set of calipers [not exact but close].The original type[2n6312]measures 1.192.The 192160 and 192152 measure about 1.187.I may be missing something,but see no reason why they won't fit the crank if it has been ground to specs or the pulleys are being made by diff vendors.What say you? don b
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TheOldHokie
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Joined: 08 Apr 2005
Posts: 5914
Location: Myersville, MD
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| Posted: Tue Nov 06, 2012 10:52 am Post subject: Re: Crankshaft Pulley |
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| carolina don wrote: | | (quoted from post at 13:28:51 11/06/12) Dan....according to my prints...the crankshaft should be 1.865 to an undersize of 1.855.I have attempted to measure the I.D.'s of the three pulleys that we sell with a set of calipers [not exact but close].The original type[2n6312]measures 1.192.The 192160 and 192152 measure about 1.187.I may be missing something,but see no reason why they won't fit the crank if it has been ground to specs or the pulleys are being made by diff vendors.What say you? don b |
I think you dropped a digit when you were typing. I assume you meant the prints said 1.1855/1.1865. I just measured an OEM pulley I took off my 51 8N with a caliper and as best I can tell it is 1.186/1.187.
I have purchased several of the 192160 pulleys from you and I pulled the last one I have off the shelf last night to send to a custiomer. He damaged the first one I sent him when he tried to install because it was so tight. As best I can tell using my calipers this one measured 1.182/1.183. I chucked it up on the lathe and barely touched it with a boring bar and it now measures 1.185/1.186. FWIW I had to do the same on the 192160 I put on my 8N a few months ago. Many years earlier I installed one of your 192160 on my 9N with zero problems. That's all I know.
TOH
PS> The 192160's all have a label on the box that says "CRAM PULLEY" 
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carolina don
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| Posted: Tue Nov 06, 2012 11:19 am Post subject: Re: Crankshaft Pulley |
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Yeah....I did drop a digit.Should read 1.1865/1.1855.I guess the reason it says cram,is because they have the wrong ID. don b
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TheOldHokie
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Joined: 08 Apr 2005
Posts: 5914
Location: Myersville, MD
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| Posted: Tue Nov 06, 2012 11:28 am Post subject: Re: Crankshaft Pulley |
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| carolina don wrote: | | (quoted from post at 15:19:55 11/06/12) Yeah....I did drop a digit.Should read 1.1865/1.1855.I guess the reason it says cram,is because they have the wrong ID. don b |
Turns out I had another one of the 192160 cram pulleys hiding on the shelf. I checked it and it measures 1.183/1.184 and is clearly 2-3 thousandths under the OEM pulley.
TOH
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Hobo,NC
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Joined: 14 Jun 2007
Posts: 10642
Location: Sanford, NC
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| Posted: Tue Nov 06, 2012 4:01 pm Post subject: Re: Crankshaft Pulley |
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I prefer'em to go on tight... They were originally made to run a pump,,, not as a replacement for a original pulley... I think the intention was to have a tight fit,,, your 9N may have had a worn snout its not uncommon....
For those that want a plug and play look for a good used OEM pulley... Are buy tools made to pull this type of replacement on the shaft...
I have posted a how to on this,,, this is what a wrench runs into regularly,,, its not someones fraught if stuff like this is a challenge for back yard Bob's...
http://www.youtube.com/watch?v=Ex_yJ_V5UH8&feature=related
Last edited by Hobo,NC on Tue Nov 06, 2012 4:06 pm; edited 1 time in total |
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John Smith8N
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Joined: 15 Aug 2007
Posts: 676
Location: Edwards, Illinois
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| Posted: Tue Nov 06, 2012 8:11 pm Post subject: Re: Crankshaft Pulley |
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| Hobo,NC wrote: | (quoted from post at 01:01:44 11/07/12) I prefer'em to go on tight... They were originally made to run a pump,,, not as a replacement for a original pulley... I think the intention was to have a tight fit,,, your 9N may have had a worn snout its not uncommon....
For those that want a plug and play look for a good used OEM pulley... Are buy tools made to pull this type of replacement on the shaft...
I have posted a how to on this,,, this is what a wrench runs into regularly,,, its not someones fraught if stuff like this is a challenge for back yard Bob's...
http://www.youtube.com/watch?v=Ex_yJ_V5UH8&feature=related |
I've got one of those handy dandy installation tools, but if the bore in the replacement pulley is actually .003" smaller than the crank snout like they're sayin', it ain't gonna pull it on there. It would go on half way and gall up, or it would crack the pulley snout. That's too much of a press fit.
One big difference in the small block Chevy balancer old Boxwrench is installing and the N tractor pulley is the keyway. The small block Chevy balancer can start on the key before you start pulling it on. The N tractor pulley just has a little slot right at the end of the pulley snout and a short key inside at the timing gear. If you can eyeball that key, then pull that tight fitting pulley all the way on the crank and have it drop dead nutz onto the key when it gets there, you're dayum good. Especially with the timing cover on so you can't see how it's going. You'd have to be magical. No backyard Bob is gonna pull that off, and very few pros, either.
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TheOldHokie
Tractor Guru
Joined: 08 Apr 2005
Posts: 5914
Location: Myersville, MD
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| Posted: Wed Nov 07, 2012 4:59 am Post subject: Re: Crankshaft Pulley |
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| John Smith8N wrote: | (quoted from post at 00:11:53 11/07/12) | Hobo,NC wrote: | (quoted from post at 01:01:44 11/07/12) I prefer'em to go on tight... They were originally made to run a pump,,, not as a replacement for a original pulley... I think the intention was to have a tight fit,,, your 9N may have had a worn snout its not uncommon....
For those that want a plug and play look for a good used OEM pulley... Are buy tools made to pull this type of replacement on the shaft...
I have posted a how to on this,,, this is what a wrench runs into regularly,,, its not someones fraught if stuff like this is a challenge for back yard Bob's...
http://www.youtube.com/watch?v=Ex_yJ_V5UH8&feature=related |
I've got one of those handy dandy installation tools, but if the bore in the replacement pulley is actually .003" smaller than the crank snout like they're sayin', it ain't gonna pull it on there. It would go on half way and gall up, or it would crack the pulley snout. That's too much of a press fit.
One big difference in the small block Chevy balancer old Boxwrench is installing and the N tractor pulley is the keyway. The small block Chevy balancer can start on the key before you start pulling it on. The N tractor pulley just has a little slot right at the end of the pulley snout and a short key inside at the timing gear. If you can eyeball that key, then pull that tight fitting pulley all the way on the crank and have it drop dead nutz onto the key when it gets there, you're dayum good. Especially with the timing cover on so you can't see how it's going. You'd have to be magical. No backyard Bob is gonna pull that off, and very few pros, either.
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Yep. Aligning the key on a fit that heavy is impossible. With .003 interference on a roughly 2" x 1.5" hub you are looking at something in excess of 4T press fit there is no way to move it once it's started. You also wouldn't need that 5/8" bolt snugged down to 150 lb-ft to keep it on The one I just skimmed measures 1.185. If my measurement is accurate according to Don's cranksahft specification that will still be a light press fit.
TOH
Last edited by TheOldHokie on Wed Nov 07, 2012 11:18 am; edited 1 time in total |
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