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Old 10-05-2020, 06:47 PM   #1
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"Green" Belts

Hi All,


I had a new to me mechanic on the boat today to do valve adjustments on both of my motors, which are Yanmar 4LHA-STP.



He noticed that I fight with belt dust on both motors and recommended that I switch to the "green" belts, but he couldn't remember the brand name. I did a little google search and I found Gates green label belts, but no green belts. Any idea what he means?


The belts on the 4LHA are too small, it's super hard to keep them at the right tension so they make a ton of dust. I've done better keeping them a little loose, but he felt like they are too loose. I've looked at the serpentine kits, but man they are expensive and hardly seem worth it unless I upgrade the alternators, even more $.


I've checked alignment, checked the pulleys for rust, all looks good, they just slip.
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Old 10-05-2020, 07:06 PM   #2
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Sorry, can't help you on the 'green' front, but when I switched to cogged belts the dust problem disappeared.
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Old 10-05-2020, 07:45 PM   #3
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Sorry, can't help you on the 'green' front, but when I switched to cogged belts the dust problem disappeared.
That meant changing the pulleys, correct?
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Old 10-05-2020, 07:57 PM   #4
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That meant changing the pulleys, correct?
Nope. They are 'V' belts, just notched/incised on the inner surface. I rummaged around on the Interweb and found a photo that illustrates their shape. (These aren't the belts I use (NAPA) just a photo that looks similar).

https://mechanidrive.com/17420-oem-a...lacement-belt/

You also might want to wait for opinions from more experienced people than I
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Old 10-05-2020, 08:00 PM   #5
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If the alignment is good, are they bottoming out on the pulleys?
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Old 10-05-2020, 08:36 PM   #6
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Quote:
Originally Posted by Dougcole View Post
Hi All,

He noticed that I fight with belt dust on both motors and recommended that I switch to the "green" belts, but he couldn't remember the brand name. I did a little google search and I found Gates green label belts, but no green belts. Any idea what he means?
He is probably referring to Gates Green Stripe® V Belts. I've used them with Yanmar power in the past which eliminated belt dust and slippage. I've also used them on high performance automotive engines for decades with the same results. Highly recommended.

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Old 10-05-2020, 08:50 PM   #7
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I just went through this exercise of trying to find better belts.

Gates very heavy duty V belts are called Fleetrunner and the tops are solid green. (Not to be confused with their green stripe belts). If you have a number from another belt you should be able to cross reference to the Gates belt. You can tell the Fleetrunner green topped belts by the HD designation after the 4 digit Gates number.

For sample, the Gates HD belt for the Ford Lehman 135 is 9476HD.

https://www.gates.com/us/en/search.p...711-00476.html

Oops, sorry Larry you posted while I was writing. My comment on the Green Stripe belts was not directed at you. In fact, the Green Stripe belts also seem to be for heavy duty use so I don’t know which one is better of if they’re both good.

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Old 10-05-2020, 09:05 PM   #8
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Take a look at the Gates Powerated V Belts. They are designed for industrial use.
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Old 10-06-2020, 05:13 AM   #9
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If you are using twin belts , many sizes can be ordered as a matched pair.
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Old 10-06-2020, 07:35 AM   #10
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Green belts are considered industrial quality, heavier duty than standard automotive belts.
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Old 10-06-2020, 08:05 AM   #11
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Took a little poking around, but I found it and ordered a pair. Thanks guys, I hope it will help.
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Old 10-06-2020, 09:55 AM   #12
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Doug
I put on the above recommended belt on my Yan 6LYA and it did seem to reduce dust. Mine is marked as both Fleetrunner and Green Stripe.
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Old 10-06-2020, 01:31 PM   #13
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Thanks Don.


I ordered two of the below belts.


https://www.amazon.com/gp/product/B0...MCXESXCG&psc=1


It was a little confusing because Gates doesn't list a belt on their site for the 4LHA-STP, but they do list one for a couple of other 4LH motors. I found other sites that show those motors as using the same belt as the 4LHA, so I assume that the Gates belt will work.
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Old 10-06-2020, 03:02 PM   #14
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Should be able to order by length. Sometimes alternators get changed and that changes belt size. You old belt number should have the length coded into it's number.

And yes, the 4LH has a rep as a belt eater. Lots of torsional activity in the crank nose. Raises heck with belts. Want to use the best belt you can find.

Gates makes good stuff. Hope it works.
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Old 10-06-2020, 03:34 PM   #15
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Quote:
Originally Posted by Ski in NC View Post
Should be able to order by length. Sometimes alternators get changed and that changes belt size. You old belt number should have the length coded into it's number.

And yes, the 4LH has a rep as a belt eater. Lots of torsional activity in the crank nose. Raises heck with belts. Want to use the best belt you can find.

Gates makes good stuff. Hope it works.

Thanks Ski. The yanmar number on my old belt is 121850-42280. Would that somehow tell me the length?
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Old 10-06-2020, 03:44 PM   #16
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FYI Advanced Auto Parts carries their own branded Fleet Runner belts that are green and notched. I just picked up a spare for the one I recently changed. They use the same numbering as Gates and look identical but have no idea who makes them?
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Old 10-06-2020, 05:37 PM   #17
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yes, I purchased the "Green Belts" as a NAPA brand.
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Old 10-06-2020, 07:50 PM   #18
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NAPA huh? Oh, NOW y'all tell me. I see how you are.
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Old 10-07-2020, 12:09 PM   #19
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NAPA/Gates 9476HD's on my Lehman 120.
Quote:
Originally Posted by kchace View Post
I just went through this exercise of trying to find better belts.

Gates very heavy duty V belts are called Fleetrunner and the tops are solid green. (Not to be confused with their green stripe belts). If you have a number from another belt you should be able to cross reference to the Gates belt. You can tell the Fleetrunner green topped belts by the HD designation after the 4 digit Gates number.

For sample, the Gates HD belt for the Ford Lehman 135 is 9476HD.

https://www.gates.com/us/en/search.p...711-00476.html

Oops, sorry Larry you posted while I was writing. My comment on the Green Stripe belts was not directed at you. In fact, the Green Stripe belts also seem to be for heavy duty use so I don’t know which one is better of if they’re both good.

Ken
Click image for larger version

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Old 10-07-2020, 03:23 PM   #20
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Gates 9470 is the correct belt. HD is simple heavy duty.
This assumes the original pulleys are on alternator. (Can't imagine why they wouldn't be.) I believe the width is 1/2" and depth is 3/8".

If there is still excessive dust you will need to shim your alternator mounts to align the pulleys.
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