Tracking down a new belt is tricky
QThe alternator belt on my 2001 3-cylinder Barrus Shire 1653 (serial no 020343) is getting on a bit and although I have a (used) spare, ordered a replacement online. The current belt identifies itself as an optibelt SUPER TX M= S XPA 1157 Lp. The replacement belt arrived stamped with optibelt Super X-POWER M= S 1157. Same length, same width at the back (1/2”) so should fit, but no, the new belt has far fewer and much larger cut outs (cogs), As the current belt taper to about 3/16” and the new belt to ¼” it won’t of course seat on the pulleys. After much rummaging around online and in chandlers I’m no further forward. Barrus didn’t respond to my enquiry. Any idea where to go from here?
ATONY REPLIES: Go here and link to their technical manual V belts - https:// www.optibelt.com/en/powertransmission/p roducts/v-belts/ super-x-power-span-style-color-0 04885-m-s-span.html?cid=3619 --- XPA belts are definitely belts with the wedge profile with a top width of 12.7mm. The 1157 is the length. No bottom width is given because that is governed by the belt profile. Classic V belts come in top widths of 13 or 10mm. It would be easy to confuse a 13mm V belt with a 12.7mm wedge belt. http://www.beltingonline.com/veeand-wedge-belts -213/help-identifyingv-belts-591/ --- shows two belt profiles with a 13mm top width. One is 8mm deep and one is 10mm deep. It seems as if Barrus may have supplied you with a different profile belt. The dimensions/pitch of the notches is of no consequence as long as the belt profile is correct. They take little part in driving and mainly serve to help the belt grip smaller pulleys. I would ring Barrus rather than email or write to them. I think the last web address will allow you to order the correct belt or seek suppliers of Optibelt belts and use the SPX 1157 number. I hope this helps but can not be sure I am right without actually seeing the engine and belt.