Guest 000 Posted August 23, 2015 Share Posted August 23, 2015 Engine tinkering time. The V belt configuration on My Perkin Parama M 30 is pretty standard, the crankshaft pulley driving the water pump and alternator in a roughly triangular plane. The water pump and alternator are set up for an 11A V belt, and the crankshaft pulley - I don't know what it is other than that it is definitely an automotive section belt. A 9A belt bottoms out in the pulley and destroys the belt fairly quickly, and an 11A belt fits nicely but the top side of the belt is proud of the pulley flanges by 1mm after a few hours running. It was 1.5mm proud when new. Is this OK, or do I have to get the pulley machined so that the belt sits flush? Quote Link to post Share on other sites
Island Time 1,239 Posted August 23, 2015 Share Posted August 23, 2015 Nope, 1.5mm proud is fine, so long is there is no slippage. There should not be, unless you have a lot of load on the belt and it has too small a belt for the loads. New belts settle a bit - check the tension again when it's done a few hours. Max belt loads can be easily found - try mr google. Balmar has a good section on belt sizing, for example. As you have noticed, the other critical factor is that the belt does not touch the base of the V - because it destroys the belt, as you have seen! Quote Link to post Share on other sites
Guest 000 Posted August 23, 2015 Share Posted August 23, 2015 Great! Thank you. I wasn't looking forward to removing the crankshaft pulley. Now I can leave well enough alone, and on to the next job.. Quote Link to post Share on other sites
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