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Reproduction OT Pulley's
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motofly196
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PostPosted: Sun Jul 14, 2019 7:27 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

That's some beautiful machine work! Be careful...you just might be getting request to fix a bunch of them!
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Mr.Ragtop
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PostPosted: Mon Jul 08, 2019 9:19 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

Well I finally got around to finishing the pulley fix. It was machined to the exact dimensions of a stock pulley.


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Mr.Ragtop
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PostPosted: Wed Aug 01, 2018 9:24 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

johnny d wrote:
Mr.Ragtop wrote:

[...]and have the skills to correct it.


so what you are going to do with it?


If you look at the other pages in this thread, i talk about fixing my pulley. I had it welded to make the OD much bigger. I will then lathe is down to the correct size of a stock pulley. Then lathe in the “slinger” groove again. It’s a lot of work, but if you have the tools and are able to do the work yourself, it’s not a big deal in the end. Here is the pic again after being welded.....
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mr. warehouse
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PostPosted: Mon Jul 23, 2018 12:56 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

Mr. Okrasa wrote:
mr. warehouse wrote:
I have a leaking ISP West OT pulley as well.
I've thought of turning it down and running sand seal.
Thoughts?

You can turn the neck down of the ISP pulley but you have to add a steel collar otherwise the seal will cut into the aluminum.


Thanks. I was told to use a "Speedi Sleeve" or similar. In the meantime, I swapped it out for a Speedwell Denzel pulley and the leak has stopped.
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Mr. Okrasa Premium Member
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PostPosted: Mon Jul 23, 2018 12:47 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

mr. warehouse wrote:
I have a leaking ISP West OT pulley as well.
I've thought of turning it down and running sand seal.
Thoughts?

You can turn the neck down of the ISP pulley but you have to add a steel collar otherwise the seal will cut into the aluminum.
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mr. warehouse
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PostPosted: Sat Jul 21, 2018 2:25 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

I have a leaking ISP West OT pulley as well.
I've thought of turning it down and running sand seal.
Thoughts?
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PostPosted: Tue Feb 27, 2018 12:41 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

Mr.Ragtop wrote:

[...]and have the skills to correct it.


so what you are going to do with it?
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Mr.Ragtop
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PostPosted: Sun Feb 25, 2018 12:56 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

oldbusboy wrote:
If the ISP OT copy pulleys are leaking, then they should take them back.

I have one on an Okrasa build that I haven't run yet.. I bought the pulley a couple years ago, so it would be interesting to see if it would be accepted as a return.

Trevor


I agree they should take them back. From talking to a friend yesterday, I guess they are aware of the issue and are concerned about it. No idea what they will do. I got mine cheap enough and have the skills to correct it. Not worth going through the hoops to get a new one hoping it’s different.
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oldbusboy
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PostPosted: Sat Dec 23, 2017 10:46 am    Post subject: Re: Reproduction OT Pulley's Reply with quote

If the ISP OT copy pulleys are leaking, then they should take them back.

I have one on an Okrasa build that I haven't run yet.. I bought the pulley a couple years ago, so it would be interesting to see if it would be accepted as a return.

Trevor
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Mr.Ragtop
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PostPosted: Sun Nov 19, 2017 9:28 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

DONGKG wrote:
Mr.Ragtop wrote:
That shouldn't matter. Empi and many others have made aluminum pulleys with the correct diameter for years without issues. So what would make these ones expend any different?

The gap that is between the case and pulley snout is still pretty decent even with an original pulley. Steel doesn't expand at the same rate that aluminum does but the difference between steel and aluminum at full heat is very small.
Isn't it that, heated, steel expands more than an aluminum?


No. Aluminum expands at a fast rate and expands further than steel.
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DONGKG
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PostPosted: Wed Oct 04, 2017 10:15 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

Mr.Ragtop wrote:
That shouldn't matter. Empi and many others have made aluminum pulleys with the correct diameter for years without issues. So what would make these ones expend any different?

The gap that is between the case and pulley snout is still pretty decent even with an original pulley. Steel doesn't expand at the same rate that aluminum does but the difference between steel and aluminum at full heat is very small.
Isn't it that, heated, steel expands more than an aluminum?
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Mr.Ragtop
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PostPosted: Wed Sep 27, 2017 8:27 am    Post subject: Re: Reproduction OT Pulley's Reply with quote

That shouldn't matter. Empi and many others have made aluminum pulleys with the correct diameter for years without issues. So what would make these ones expend any different?

The gap that is between the case and pulley snout is still pretty decent even with an original pulley. Steel doesn't expand at the same rate that aluminum does but the difference between steel and aluminum at full heat is very small.
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frikendelicious
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PostPosted: Wed Sep 27, 2017 3:39 am    Post subject: Re: Reproduction OT Pulley's Reply with quote

I believe they reduced the diameter to prevent the pulley from cutting into the case. This happend a lot with the earlier ISP ones. The aluminium expands more than the original pulley. The reduced diameter is now causing the oil leaks. So Im wondering: is that only when the engine is cold, or is it also still leaking when warm? Either way, not really nice!

thanks,
jeroen
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PostPosted: Tue Sep 26, 2017 10:13 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

I sand blasted mine and then had it welded up. I'll be lathing it back down to the correct 49.9mm and then cutting the "sling grooves" back in. Should be good to go then
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Mr. Okrasa Premium Member
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PostPosted: Tue Aug 29, 2017 12:30 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

I just received (2) OT crankshaft pulleys and by reading this thread, I think I should send them back? The top pulley is the
one from ISP and the bottom is a stock pulley. The measurements are way off!..........UGH Crying or Very sad Thoughts anybody?

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Image may have been reduced in size. Click image to view fullscreen.

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sled
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PostPosted: Fri Aug 25, 2017 4:36 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

leaked like a sieve on an okrasa engine I worked on...yanked it off for an original pulley, much better!!

they don't even look that cool Shocked
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PostPosted: Fri Aug 25, 2017 11:51 am    Post subject: Re: Reproduction OT Pulley's Reply with quote

Mr.Ragtop wrote:
Anything new from Anthony on the oil slingers section being too small. I've now heard from multiple people that they cause oil leaks at the pulley.


Not heared anything, but mine is also leaking.. Sad
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Mr.Ragtop
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PostPosted: Sat Jul 29, 2017 10:29 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

Anything new from Anthony on the oil slingers section being too small. I've now heard from multiple people that they cause oil leaks at the pulley.
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PostPosted: Sun Mar 05, 2017 11:03 pm    Post subject: Re: Reproduction OT Pulley's Reply with quote

jdub63 wrote:
So here's a couple of pictures of my belt trials...

Image may have been reduced in size. Click image to view fullscreen.


jdub63

You have the correct 36hp generator pulley as I can tell from your photo that 1 half has a "wider" lip. Not sure if rtroy is aware that he is not running a 36hp generator pulley but a much later one. Probably a 40hp which explains why his fan belt fits and yours doesn't. You can see on my engine, I'm running a 10X900 Continental belt BUT with a Denzel crankshaft pulley. See photo below.

Image may have been reduced in size. Click image to view fullscreen.


Have you tried running a fan belt WITHOUT the "cog" type serrations? That may help. Good luck, Mr. Okrasa Cool
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rtroy
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PostPosted: Mon Jan 02, 2017 10:04 am    Post subject: Re: Reproduction OT Pulley's Reply with quote

IDK why anyone would have trouble with the belt size; if you run the stock 36hp gen pulley, the standard belt should fit fine. Here's an example with a genuine OT pulley, 36hp gen pulley circa 1959, and a stock belt:


Image may have been reduced in size. Click image to view fullscreen.



Image may have been reduced in size. Click image to view fullscreen.



Remember, the OT pulley is the same size as the standard 36hp pulley; while it will take a wider belt, a wider belt is not required.

If you have a problem, it's probably because the repro isn't that faithful. . .
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