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Post by Deleted on Feb 23, 2019 9:48:02 GMT
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Post by Deleted on Feb 23, 2019 9:49:42 GMT
I did mention that as well @gazza If someone asks you to check the serp belt on an engine what do you do? I bet you don't inspect the timing belt However as the timing belt may be the only actual "serpentine type" belt on some boat engines I can see what Tony means in terms of the actual belt configuration.
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Post by JohnV on Feb 23, 2019 9:49:55 GMT
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Post by Deleted on Feb 23, 2019 9:53:49 GMT
Can't we get back to talking about the skateboarding woman?
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Post by Deleted on Feb 23, 2019 10:01:30 GMT
Good idea.
What sort of skateboard was it a long board or a penny board ?
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Post by Deleted on Feb 23, 2019 10:01:51 GMT
What Stabby refers to as a toothed belt is actually a cogged vee belt, a cogged belt is chosen to make the tighter wrap on a small pulley, like you'd often find on a small high speed alternator driven by a comparatively slow running engine.
A toothed belt is chosen to drive a system where synchronization of components is needed to be maintained - such as an engine camshaft drive.
Cogged or vee have nothing to do with stretch, a plain vee belt may also be chosen to allow a degree of slip in high torque systems, thus protecting the drive system from torque spikes. Not really applicable in an alternator drive system but a point of fact none the less.
Belt drive system design is a huge subject, but who knew all you needed was a rag, some white spirit and plenty of time on your hands to keep adjusting the damn thing!
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Post by Jim on Feb 23, 2019 14:10:30 GMT
Belt drive system design is a huge subject, but who knew all you needed was a rag, some white spirit and plenty of time on your hands to keep adjusting the damn thing! It seems Mrs Tabby has a fetish, like Foxy's oil. Maybe they need to share a boat. I've always just done the fit and forget technique with v belts. Perfectly tensioned by wrack o't' th'eye and twist o't' gob. Most of them have an automatic squeak alert to tell you it needs adjusting. Or just spray it with Wd40, it stops the squeak. No wiping at any point either. Unless it is drenched by an oil spill obvs. Has anyone ever had a belt fitted by a professional mechanic and been asked to return for a tension check after x miles or hours? Speak up, was that a deafening chorus of "No!"?
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Post by TonyDunkley on Feb 23, 2019 14:49:23 GMT
Belt drive system design is a huge subject, but who knew all you needed was a rag, some white spirit and plenty of time on your hands to keep adjusting the damn thing! It seems Mrs Tabby has a fetish, like Foxy's oil. Maybe they need to share a boat. I've always just done the fit and forget technique with v belts. Perfectly tensioned by wrack o't' th'eye and twist o't' gob. Most of them have an automatic squeak alert to tell you it needs adjusting. Or just spray it with Wd40, it stops the squeak. No wiping at any point either. Unless it is drenched by an oil spill obvs. Has anyone ever had a belt fitted by a professional mechanic and been asked to return for a tension check after x miles or hours? Speak up, was that a deafening chorus of "No!"? I can quite believe he does have to clean up oily pulleys and repeatedly re-tension the v-belts on whatever engine he's got. But I'd also bet that it's down to having a tired old engine with bags of ring blow-by that's puthering oil-laden crankcase fumes all over itself, plus a knackered front end/timing case crankshaft oil seal, and just for good measure, a worn out set of ancillary drive pulleys that begin to ruin new belts from the moment they're fitted.
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Post by peterboat on Feb 23, 2019 16:34:51 GMT
You and I are mechanics Gazza, I learnt a long time ago how to tension a belt, though I have to say boats are well overdue auto tensioners! As for oil mist remember what he has in his boat, its an old BMC I will lay odds its breather will be to air hence the oil mist modern diesels especially jap ones dont breath oil and in most cases dont use it But that's the difference between, say, working commercially on modern vehicles, and restoring a classic car. When you service two and three year old Fords and Vauxhalls, you have to turn the job around in 30 minutes. When you restore a Mk2 Jaguar you leave the nuts and bolts soaking in a vinegar dip for a week. The massive majority of boaters do not have uber-efficient euro 5+ engines in their boats. I have repaired lots of old jags/Rolls Royces/Aston Martins and restored them as well, v belts can and do have auto tensioners, industrial diesels like we have in boats arnt Euro rated like cars, lorries or buses they have Tier ratings a google search will show you
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