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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Old 12-09-2012
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Universal M4-30 Alternator Belt

The M4-30 on my boat had a "Carquest" alternator belt. There are two part numbers on it: "7345 XL" and "11A0875"

This is a simple v-belt with no cogs. When I look up 11A0875 online, I only find belts with cogs. There's a spare on board with cogs that does not fit.

I don't know why it didn't use Westerbeke's 302084 belt. I presume one of the the previous owners changed something necessitating a belt change. On the other hand, they might just have grabbed the nearest usable belt after a failure.

Is anyone here know where to find the "7345 XL" or "11A0875" belt?

If not, does anyone here have the measurements (length, top-width) for the 302084 belt so that I can check for fit?
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Old 12-09-2012
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Re: Universal M4-30 Alternator Belt

Presumably you can measure yours for reference? or are you a long way from the boat/belt?

This site has lots of listings for comparison.. Universal's ~$40 price seems high.

http://www.vbeltsupply.com/ecommerce...wrapped-belts/
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Re: Universal M4-30 Alternator Belt

Quote:
Originally Posted by Faster View Post
Presumably you can measure yours for reference? or are you a long way from the boat/belt?

This site has lots of listings for comparison.. Universal's ~$40 price seems high.

A Classic V-Belt Supplier - A Section Belts 1/2' belts
Thanks for the link.

The belt is very badly worn, so these measurements are not precise. It's about 34.5" long, 5/16" wide at the top, and 3/16" deep.

Nothing on that site seems to match those dimensions. If I assume the belt was once wider, the 3L345 (3/8" wide, 34.5" long) seems right. The old belt was loose even at max tension, so I'd probably get the 3L340K (3/8" wide, 34" long, kevlar).

I'd feel better ordering it if someone could share the dimensions of the "proper" Westerbeke 302084 belt.
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Re: Universal M4-30 Alternator Belt

If you have it off, take it into an auto store, and get a Gates belt (also carried by Napa).

The XL # is the length.
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Re: Universal M4-30 Alternator Belt

Thanks everyone. Hints from this forum and some extra digging reveals how to parse the part numbers.

7345 XL = 7/32" top-width x 34.5 length

11A0875 = 11mm" top-width (A section?) x 875mm length

That belt had worn down 3mm.
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Re: Universal M4-30 Alternator Belt

Thanks for the clarification, I knew it was "out there" somewhere.

Suggestion: buy two or three, and throw out all of the old ones. Label them well. Don't ask how I know. (Hee, hee, hee, I always wanted to say that...)
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