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post #1 of 44 (permalink) Old 12-11-2005, 12:35 PM Thread Starter
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FYI: belt sizes

last nite my fan belt broke and well it was due to a/c compressor pulley busting on me and now have to have the a/c bypassed as well ( i don't have a smog pump either). I wanted to save some of y'all the headache if you plan on deleting your smog pump or smug pump and a/c by providing the p/n on those belts. I will post a diagram on how to route them later today. For 91-93 5.0 mn12s

for without smog pump: 930K6 (93 inches long, 6 ribbed)

for without smog pump and a/c: 900k6 (90 inches, 6 ribbed)



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post #2 of 44 (permalink) Old 12-11-2005, 01:12 PM
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well i rather have that happen than a oh lets say a blancer/ engien cracking, hehe , i am going to put mine back together with the fseries a/c delete pulley when i go back together for the tiem being, need a compressor for mine too

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post #3 of 44 (permalink) Old 12-11-2005, 01:16 PM Thread Starter
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Quote:
Originally Posted by jk89cat
well i rather have that happen than a oh lets say a blancer/ engien cracking
thats exactly what i was worried about when it happened

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post #4 of 44 (permalink) Old 12-11-2005, 03:53 PM
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are those measurments for the 5.0? id really like to delete the smog pump from my 86 Bird, i read u can gain like 10 horses?
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post #5 of 44 (permalink) Old 12-11-2005, 05:00 PM Thread Starter
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no real gain...if anything maybe one hp and yeah these are the measurements for the mn12 91-93 5.0's

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post #6 of 44 (permalink) Old 12-12-2005, 09:54 PM
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oic, so it wouldent work on my 86 bird? and if only that much gain, probly wouldent be worth it unless that belt was cheaper and i needed a new one.
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post #7 of 44 (permalink) Old 12-27-2005, 03:19 PM
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Orlando,

Thanks for posting the belt info...it came in very handy because I'm currently in the process of deleting the AC on my 347 turbo SC and couldn't find info on the belt length anywhere.

David

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post #8 of 44 (permalink) Old 12-27-2005, 10:55 PM Thread Starter
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best of luck to you David

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post #9 of 44 (permalink) Old 02-03-2006, 03:34 PM
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I just picked up an 855K6 (or rather the goodyear version, as thats all they had at the time), and I find its a somewhat loose fit. Loose enough that I'm not comfortable driving with it on, has anyone else had a similiar experience?

I'm using all stock pulleys, except for possibly a slightly smaller alternator pulley, I'm also using a 3G alternator with Lonnie's bracket, I dont know if that makes any difference, I didnt pay close enough attention to any differences in the pulley location when I installed it.

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post #10 of 44 (permalink) Old 02-03-2006, 04:08 PM
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Quote:
Originally Posted by StupidFly
I just picked up an 855K6 (or rather the goodyear version, as thats all they had at the time), and I find its a somewhat loose fit. Loose enough that I'm not comfortable driving with it on, has anyone else had a similiar experience?

I'm using all stock pulleys, except for possibly a slightly smaller alternator pulley, I'm also using a 3G alternator with Lonnie's bracket, I dont know if that makes any difference, I didnt pay close enough attention to any differences in the pulley location when I installed it.
Mine fit very tight and if anything it could stand to be a little longer. I'm also using the Lonnie type bracket w/3G alt. I do have an aftermarket Idler pulley that may be a little larger than stock diameter, and that might be why mine fit so tight.

David

PS: I'm using a Dayco gatorback looking belt.

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post #11 of 44 (permalink) Old 02-03-2006, 05:15 PM
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Quote:
Originally Posted by David Neibert
Mine fit very tight and if anything it could stand to be a little longer. I'm also using the Lonnie type bracket w/3G alt. I do have an aftermarket Idler pulley that may be a little larger than stock diameter, and that might be why mine fit so tight.

David

PS: I'm using a Dayco gatorback looking belt.

hmm, other than the possibly larger idler pulley, that sounds identical to mine. I ended up using a 84.5" gatorback belt, though I think an 85" might have been slightly better... we'll see how well this one breaks in. I ended up taking my stock belt and using vice grips to lock it down to about the right size for the bypass routing, then measured for length.

I measured the 85.5" gatorback belt, and I found it to be about .25" longer than advertised. Now, that could probably be chalked up to measuring error, but I'd share. I did not get a chance to measure the 84.5" gatorback belt I installed.

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post #12 of 44 (permalink) Old 02-03-2006, 07:49 PM
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well its better to use a idler instead of bypassing the a/c that way you wont quite run into this issue

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post #13 of 44 (permalink) Old 02-04-2006, 12:25 AM
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Quote:
Originally Posted by jk89cat
well its better to use a idler istead of bypassign the a/c that way you wont quite run into this issue

I agree, however I plan to have the leak in my AC system fixed and then recharged sometime this spring... I wont make it through summer without it I live in the middle of the damn sonoran desert for Pete's sake.... near death valley

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post #14 of 44 (permalink) Old 09-30-2006, 09:57 PM
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Quote:
Originally Posted by StupidFly
I just picked up an 855K6 (or rather the goodyear version, as thats all they had at the time), and I find its a somewhat loose fit. Loose enough that I'm not comfortable driving with it on, has anyone else had a similiar experience?

I'm using all stock pulleys, except for possibly a slightly smaller alternator pulley, I'm also using a 3G alternator with Lonnie's bracket, I dont know if that makes any difference, I didnt pay close enough attention to any differences in the pulley location when I installed it.

I don't remember what belt I used cause I just estimated and then tried ones out in the autozone parking lot until I found one that fit, but I remember that I first got one belt, and after a few weeks I have belt dust all over my engine bay, so I went and bought a slightly shorter one and didn't have any problems after that.

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post #15 of 44 (permalink) Old 05-09-2007, 05:02 PM
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To add to this thread, I have a '92 5.0L HO in my '85 Crown Vic. I run a 72.5" belt. This is in conjunction with underdrive pulleys, and my only accessory is power steering. The power steering pump is mounted in the high position like you'll see on many mustangs. Just thought I throw that in there. Also, with out the underdrive pulleys on the engine, the belt length was 73.5", which this belt length would have worked, but it just wasn't in a good range on the tensioner pulley.

So here's the breakdown in a short version of the belt lengths:

5.0L HO with altenator, water pump, crank, and power steering - 73.5"

5.0L HO with altenator, water pump, crank, power steering with March underdrive pulleys - 72.5"
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post #16 of 44 (permalink) Old 05-26-2007, 07:38 PM
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I ran an 85.5 (smog and AC delete) and I am led to believe it is too long, the idlers make horrible noise! I'm going to try an 84.5 tomorrow and if that is a bit too snug an 85.

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post #17 of 44 (permalink) Old 05-27-2007, 07:46 PM
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I have an 83 on my car its got the ac and smog delete with underdrive pulley's

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post #18 of 44 (permalink) Old 06-19-2007, 09:19 AM
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Different Idler, Different Belt

I did the smog delete a couple of weeks ago and the belt size listed above wasn't close enough. This I feel was due to the smaller idler replacement from Autozone. Mine required a 915K6 which I had to get from Advance Auto. Still seems ok after a couple of weeks. We will see.

Brad

Does anyone know where to get the correct idler pulley for a '93 5.0?

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post #19 of 44 (permalink) Old 06-19-2007, 10:14 AM
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The tensioner and idler from a 94-95 Mustang should work as well.

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post #20 of 44 (permalink) Old 11-10-2007, 03:37 PM
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FWIW I was able to use a stock length belt when I put on my Summit Racing under drive crank and waterpump pulleys. Note that I did not use the alternator pulley from the under drive kit so I don't know if you'll still be able to use a stock length belt when swapping all three pulleys. I used a Goodyear Gatorback belt, part # 4061080 at Auto Zone.
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post #21 of 44 (permalink) Old 08-05-2008, 07:28 PM
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belt for my 351w with all stock pullies and smog and a/c delete was 88.25" long. Ironically its the same belt for the -88 fox body birds with the 5.0 and a/c delete.

belt is tight as all hell so it would probably be better to go with maybe an 88.5" belt, although when i was looking i couldn't find one. I think the next size up was 89".

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post #22 of 44 (permalink) Old 12-18-2008, 01:43 PM
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Here's an 850K6 from Autozone used to bypass the smog pump and A/C compressor.





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post #23 of 44 (permalink) Old 05-16-2009, 10:41 PM
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I need one that just bypasses the ac. Anyone have a part number for this?

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post #24 of 44 (permalink) Old 07-10-2009, 05:09 AM
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On a similar topic--my 1992 5.0 has an idler pulley that is rather worn down. it is fine for the most part, but it does have a tendency to stall at red lights, unless supreme is in the tank. Even then, the air condition drains A LOT of horses. Do you think replacing the idler pulley would help remedy this problem?

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post #25 of 44 (permalink) Old 08-19-2009, 08:12 PM
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What I've done is put an idle pulley in place of smog pump and removed the a/c so complete bypass. I get a slack/strech to the belt from the crank to the power steering because its such a long jump without the a/c pulley there. Thinking of adding another idle pulley there, does anyone else get this slack/strech effect? I'm running a large cam too F303, maybe that has some thing to do with it.

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post #26 of 44 (permalink) Old 01-26-2010, 12:50 PM
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Quote:
Originally Posted by MGroff View Post
What I've done is put an idle pulley in place of smog pump and removed the a/c so complete bypass. I get a slack/strech to the belt from the crank to the power steering because its such a long jump without the a/c pulley there. Thinking of adding another idle pulley there, does anyone else get this slack/strech effect? I'm running a large cam too F303, maybe that has some thing to do with it.
Keep us posted.

I'm going to be deleting the smog pump on Sweetie's 1991 Cougar XR7, but don't like the idea of that long run without something to support it.

Plus, an idler bolted on in place of the smog pump means that come dark-30 in Podunk, TX I can buy the stock size from the AutoShack and it fits good enough to get home

RwP
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post #27 of 44 (permalink) Old 01-26-2010, 01:30 PM
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I run a 32.5" belt on mine.
Thats only running the crank and alternator...with underdrives.

I thought I had a pic....but can't find one hosted.

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post #28 of 44 (permalink) Old 01-26-2010, 07:39 PM
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I'm using the 930K6 listed in the first post with smog pump delete and I'm having a problem with it slipping off the tensioner pulley. I have the Summit crank and water pump underdrives. When I give it a little throttle from idle I can see the belt kind of try to walk off the tensioner pulley toward the engine. The pulley surface does have some wear. Is this what a loose belt does or could the pulley not being smooth cause it?
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post #29 of 44 (permalink) Old 07-08-2010, 09:05 PM
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How long of belt would one need if they put on an electric water pump and wanted to bypass the smog?

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post #30 of 44 (permalink) Old 09-08-2010, 02:41 AM
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I just installed a Napa (gates) 25-060930HD belt (Heavy Duty Greenback belt), bypassing the smog pump....installed perfectly.

So yeah, I bought two Lincolns in a week.

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