Gates Timing Belt T068

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Re: Dayco Timing Belt Codes

Post by rridge » Sat Feb 03, 2018 5:04 pm

Attached is a picture of 148 tooth Dayco timing belt for 2L Twin Cam engines. The white number are the date code and mold position. The date code reads year 2011, week 14, day 6. The last three digits are position on the mold from which the belt was cut, 051, 052, etc.

The codes in blue are the part numbers. Dayco catalogs the belts under two different part numbers. The 94667 is the p/n for their European catalog. The 95068 is the North American p/n. The small blue type says "made in Italy". I have an almost identical belt in an unbranded box that I got from IAP some years ago.
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Dayco Timing Belt Code.jpg
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Re: Gates Timing Belt T068

Post by fp55scca » Sat Feb 03, 2018 7:17 pm

--Richard, nice work, but I'm a little confused? The belt pictured below is an unmarked "Duralast" product(AutoZone) for a 1756cc motor, that appears to be from the same manufacturer? The same format in any case. While the date code is nearly erased on mine, I read it as "10 041058" (59/60/61). If I use your code format, this would be 2010, week 4, day one....and mold positions 058, 059, 061, etc. Perhaps the date of the year would be a 3 digit code, ie. in my case "041" or the 41st day of year? Yours would be "146" or the 146th day of the year? What do you think?
Duralast Timing Belt.jpg
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Re: Gates Timing Belt T068

Post by davedecker4 » Sat Feb 03, 2018 7:56 pm

Thanks Richard! Very nice explanation of something to benefit us all.
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Re: Gates Timing Belt T068

Post by bartigue » Sat Feb 03, 2018 10:20 pm

Using Richards logic the date code would be April 10th 2010
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Re: Gates Timing Belt T068

Post by rridge » Sat Feb 03, 2018 10:27 pm

Jim,

I think 10-04-1 is 2010, fourth week, first day. Date codes are a big deal with Ferrari owners and the Italian plant that Dayco runs is the big Ferrari belt supplier. So there is a lot of discussion of Dayco belt codes on a certain web forum. Also I've gone back and check the receipts on my belts. I got a 2006 belt in 2011 and today I got a 2011 belt in 2018. The 2011 belt came out of a Dayco box with a 2012 on the label. As these twin cam powered cars come out of service it leaves a lot of old stock around. But as long as it hasn't hung on a hook for those years or been exposed to sunlight it should be o.k. So says Mr. Croft.
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Re: Gates Timing Belt T068

Post by fp55scca » Sun Feb 04, 2018 2:03 pm

rridge wrote:
Sat Feb 03, 2018 10:27 pm
Jim,
I think 10-04-1 is 2010, fourth week, first day.
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--Richard, the problem I see with that interpretation, is that there are only 6 numerals following the two digit year-code. If mold positions are 3 numerals, ie. 051, 052, 053, etc. then this only leaves 3 digits for the month sequence and the day. If "04" is the 4th month, then what happens when the day is a two digit number? I haven't seen any belts with 7 digits? ..... :?
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Re: Gates Timing Belt T068

Post by rridge » Sun Feb 04, 2018 3:33 pm

Jim, months don't enter into it. Once you know the one or two digit year and the two digit week (01 to 53) you only need a single digit to identify the day of the week, Monday of any week is day 1, Tuesday is day 2 etc. Most date codes are for the manufacturer and distributors use and not intended to be easily read by the end user. The Dayco code format is a common one. Other variations use a single digit for the year, the year as the final digit rather than the first, or a switch in the position of day and week.
Last edited by rridge on Sun Feb 04, 2018 3:43 pm, edited 1 time in total.
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Re: Gates Timing Belt T068

Post by fp55scca » Sun Feb 04, 2018 3:39 pm

--Ok Richard.....I was thinking "day" was day of the month! That explains it. Thanks.
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Re: Gates Timing Belt T068

Post by fp55scca » Mon Feb 05, 2018 11:28 am

--I guess as an afterthought, I wonder why they don't just use a Julian Date calendar?
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Re: Gates Timing Belt T068

Post by rridge » Mon Feb 05, 2018 12:48 pm

I've wondered the same thing. A two digit code for the week and a single digit for day of week could just as easily have been a three digit code for day of the year. I do think the Dayco date code is a common manufacturing format.

There are cars that date codes stamped somewhere on almost every piece that go into them and groups of owners who can decode and explain the proper date range for an original fender vs. a subsequent replacement. Fortunately we are not one of those groups. Instead we have Gino's name in chalk under the sill plate.
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