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Old 02-07-2017, 10:12 AM   #1
dmw319
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Question Belt size a little too long

My engine has been squeaking a little on idle and I've narrowed it down to what I think to be a loose belt. I am using the standard size belt. It's the bottom one, the smaller of the two that goes to the crank and power steering pulley. For some reason, I have it all the way as tight as the power steering tensioner will allow and it is just not snug enough and I think that's why one of the pulleys is squeaking. Is there another belt that is the right specs but just a tad bit shorter that I could use? Anyone else run into this issue?

Thanks!
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Old 02-07-2017, 12:23 PM   #2
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Re: Belt size a little too long

Take the belt to the local parts store. They can measure it or get the length from the part number. Get one about 1 in. shorter. A little bit goes a long way.
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Old 02-07-2017, 12:29 PM   #3
dmw319
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Re: Belt size a little too long

Quote:
Originally Posted by Wrenchbender Ret View Post
Take the belt to the local parts store. They can measure it or get the length from the part number. Get one about 1 in. shorter. A little bit goes a long way.
this was the method I was going to do, just wondering if anyone else had a similar thing happen
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Old 02-07-2017, 12:48 PM   #4
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Re: Belt size a little too long

if the belt is real close to fitting an inch longer will be too big. I would find one that is about thickness of the belt longer. I just made several trips to parts store to get one to fit. a little bit makes a big difference.
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Old 02-07-2017, 12:49 PM   #5
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Re: Belt size a little too long

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Originally Posted by 1968aj View Post
if the belt is real close to fitting an inch longer will be too big. I would find one that is about thickness of the belt longer. I just made several trips to parts store to get one to fit. a little bit makes a big difference.
I see your point. In this case though, the belt is too big. I need a slightly shorter belt.
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Old 02-07-2017, 01:16 PM   #6
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Re: Belt size a little too long

one inch is a lot it this belt already fits, belts are usually measured by the manufacturer in mm... what brand belt and what setup (serpentine, v-belt?)
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Old 02-07-2017, 01:28 PM   #7
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Re: Belt size a little too long

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Originally Posted by jsera View Post
one inch is a lot it this belt already fits, belts are usually measured by the manufacturer in mm... what brand belt and what setup (serpentine, v-belt?)
It's a Gates 7350 belt.
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Old 02-07-2017, 09:11 PM   #8
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Re: Belt size a little too long

Consider the width of your power steering belt, if it is to narrow it will be too deep in the v grove. Wider belt will have more bite in the pulley v grove! My original p/s belt fills the pulley flush or a little more to the top of the pulley! NO SQUEEK SINCE 1969--36,000mi. hope this helps! HAPPY TRAILS
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Old 02-07-2017, 09:56 PM   #9
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Re: Belt size a little too long

Go down a 1/2". Your belt is a 7350, get a 7345. At lest that's how I understand the belt numbers work...unless they changed to metric. The last three digits are inches and fraction... 450 = 45.0" and 455 = 45.5". That's always worked for me
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Old 02-07-2017, 10:32 PM   #10
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Re: Belt size a little too long

Quote:
Originally Posted by special-K View Post
Go down a 1/2". Your belt is a 7350, get a 7345. At lest that's how I understand the belt numbers work...unless they changed to metric. The last three digits are inches and fraction... 450 = 45.0" and 455 = 45.5". That's always worked for me
That is correct right to a T
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Old 03-06-2017, 04:19 PM   #11
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Re: Belt size a little too long

Thanks yall.

They didn't have any 7345s in stock, but they did have 7340. It was a little short, but I was able to get it on there with the assistance of a flathead screwdriver. Got it tightened down and no more belt squeal!
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Old 03-06-2017, 07:37 PM   #12
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Re: Belt size a little too long

now keep the new belt package in the glovebox so you will know next time what belt to get.
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Old 11-23-2019, 01:27 PM   #13
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Re: Belt size a little too long

Quote:
Originally Posted by special-K View Post
Go down a 1/2". Your belt is a 7350, get a 7345. At lest that's how I understand the belt numbers work...unless they changed to metric. The last three digits are inches and fraction... 450 = 45.0" and 455 = 45.5". That's always worked for me
I had the same issue, thank for your excellent advice
http://67-72chevytrucks.com/vboard/s...42#post8631742
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Old 11-23-2019, 01:58 PM   #14
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Re: Belt size a little too long

the belt sizing above is correct, thanks Tim..

since the adjustment travel is only half of the belt's circumference, there should be plenty of sizes to choose from..

but the bigger question I have is why the stock size belt wouldn't fit assuming the factory brackets and pulleys are in place..

have you loosened all pivot bolts and adjustment bolts completely and checked for full range of motion?

engine size and year not disclosed and I'm not sure for which engines and when brackets changed, but I would verify that first..

there has to be a reason the correct spec belt that fits a million trucks doesn't fit yours..

good luck!
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Old 11-23-2019, 02:11 PM   #15
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Re: Belt size a little too long

Quote:
Originally Posted by Killer Bee View Post
the belt sizing above is correct, thanks Tim..

since the adjustment travel is only half of the belt's circumference, there should be plenty of sizes to choose from..

but the bigger question I have is why the stock size belt wouldn't fit assuming the factory brackets and pulleys are in place..
you are right, interesting question
have you loosened all pivot bolts and adjustment bolts completely and checked for full range of motion?
Yes, the pump is on the end of adjustment travel
engine size and year not disclosed and I'm not sure for which engines and when brackets changed, but I would verify that first.
1968 327 guessing everything is original

there has to be a reason the correct spec belt that fits a million trucks doesn't fit yours..
Found to change the belt size was an easier way, but you are right, Interesting, will investigate. Would like to know dimensions from pump pulley and crankshaft pulley
good luck!

Let's investigate
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Last edited by GerhardH; 11-23-2019 at 02:33 PM.
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Old 11-25-2019, 07:50 AM   #16
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Re: Belt size a little too long

I would entertain that the
power steering pump was
changed at least once and a smaller pulley
was on that pump already and didnít
get changed to the original size
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Old 11-25-2019, 12:08 PM   #17
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Re: Belt size a little too long

Quote:
Originally Posted by racerop View Post
I would entertain that the
power steering pump was
changed at least once and a smaller pulley
was on that pump already and didnít
get changed to the original size
Now, there's a thought! After all these years, who knows what could have been done? When I think back on all the things I did, that wouldn't be a surprise.
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Old 11-25-2019, 01:03 PM   #18
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Re: Belt size a little too long

Quote:
Originally Posted by racerop View Post
I would entertain that the
power steering pump was
changed at least once and a smaller pulley
was on that pump already and didn’t
get changed to the original size
Or the pulley was the same size but a wider groove.
Belt would sit lower in the groove and not make contact with the groove sides.
Belts are supposed to sit level with the edge of the pulley.
Check the width of the belt too.
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Old 12-01-2019, 07:15 PM   #19
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Re: Belt size a little too long

Dear fellows, thanks for your posts and your opinion highly appreciated.
Some investigation done:

1. Remember 1968 327 with PS (Power Steering), AC (Air Condition)

2. Assuming that the original belt routing as as follows (see picture 1):
Drive shaft 3 groove to Power Steering 1 groove
Drive shaft 3 groove to water pump/fan 2 groove to generator 1 groove
Drive shaft 3 groove to water pump/fan 2 groove to Air condition 1 groove

3. Assuming that the original parts are mounted:
379194361 Steering pump pulley (picture 2)
3923898 Drive shaft pulley (picture down below)
3924557 Steering pump support (picture 3)
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Last edited by GerhardH; 12-01-2019 at 07:50 PM.
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Old 12-01-2019, 07:36 PM   #20
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Re: Belt size a little too long

The pump was changed in 2018
First picture pump before 2018 installed, Banjo Style Power Steering Pump, second picture now installed, different form.
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Old 12-01-2019, 07:43 PM   #21
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Re: Belt size a little too long

If it comes to the belt 7350 the length is 35.57" this is a little bit longer than the original one 35".

The original with is 3/8" (0.375") , the 7350 has 13/32 (0.41"), but in my opinion the belt has a good setting in the groove.

The only explanation I have is that the pump himself with the newer design has not exactly the same geometry and together with the slightly longer belt it comes to the difficulties.

Will ask the workshop guys which pump they have installed, I was in this time under time pressure and have not followed the process deeply.

Anyway it was great fun to investigate all the part numbers and learn about my truck from all of you.
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Last edited by GerhardH; 12-02-2019 at 03:02 AM.
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Old 12-01-2019, 08:11 PM   #22
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Re: Belt size a little too long

Quote:
Originally Posted by El Dorado Jim View Post
now keep the new belt package in the glovebox so you will know next time what belt to get.
That's "Old School" El Dorado
My grandkidz showed me how to become high/modern tech with my iPhone and the "Notes" app, I've got a section for each vehicle with pertinent info for belts, hoses, brakes, bearings, filters etc., etc.

Even got one for my forklift!.....You are Welcome!
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Old 12-02-2019, 10:20 AM   #23
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Re: Belt size a little too long

Today I found out that the banjo style and the teardrop style have the same dimensions regarding holes and bolts. Its just a different reservoir style.

https://www.tuffstuffperformance.com...tructions.html

No idea why the 7530 belt is to long.
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