suejoe6174 Posted August 12, 2013 Share Posted August 12, 2013 Need Help ------ Anyone know the correct fan belt for a 711 engine in a 1963 B61 Mack ???????????????Joe Quote Link to comment Share on other sites More sharing options...
leversole Posted August 12, 2013 Share Posted August 12, 2013 I have a 675 in my B...had to make 3 or 4 trips to NAPA to get the length right... Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted August 12, 2013 Share Posted August 12, 2013 here is a simple way to get your belts and I used this yesterday on a a/c belt. Get a old belt that is still in good shape with proper width but much too long. Rap it around said pulleys and pull tight and over lap the extrax belts side by side then make you a mark across both of the belts and take to parts store and use the belt# and measure the excess amount too long and tell youe parts saleman to substract that amount from the belt # and its good from there.I have found its best to use the women sales person if one is there. Most of them undertand faster what your after. Quote glenn akers Link to comment Share on other sites More sharing options...
thomastractorsvc Posted August 12, 2013 Share Posted August 12, 2013 went through this a couple months ago, I bought Gates Green Stripe as they are carried by O'reillys. Truck belts are different width than car/light truck Gates part # 9670, for my B61. I would start there and see which way you need to go, if you have the old belts see if it has a number on it and use the Gates interchange http://www.gatespowerpro.com/Comergent/en/US/adirect/gates?cmd=GRCPartInterchangeSearchFrame&CFID=86847941&CFTOKEN=10467979 Quote Robert"I reject your reality and substitute my own." Link to comment Share on other sites More sharing options...
Maddog13407 Posted August 12, 2013 Share Posted August 12, 2013 Mine are Mack part number 88GB439P652 on my 711' could go one size smaller as they are right at the end of the adjuster slot. Quote Link to comment Share on other sites More sharing options...
thomastractorsvc Posted August 12, 2013 Share Posted August 12, 2013 That one shows it can be gotten as a Gates Belt, looks like it shorter than the B 61 Belt. Are the 711 matched belts? 9650 AUTO V-BELT XL Quote Robert"I reject your reality and substitute my own." Link to comment Share on other sites More sharing options...
Freightrain Posted August 12, 2013 Share Posted August 12, 2013 Is the 673 different then a 711? I run a pair of matched belts(have to look tonight to get number)from local bearing distributor.Even a piece of string could be use to get you a close guess. Then see if you need longer/shorter from that. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
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