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Joeblow
Joeblow

Posted: Sat Jun 23, 2012 6:59pm

Post Subject: BMC 1.8 Alternator belt

Hi, Just new to the forum and have picked up some really useful stuff already. Could you please advise if there is a standard size alternator belt for a 1.8 BMC or does it depend on the type of alternator?

Tony-B
Tony-B

Posted: Sun Jun 24, 2012 8:11am

Post Subject: BMC 1.8 Alternator belt

BMCs have been in common use since at least the 1960s and have been marinised by a whole host of people from Newage/Tempest who did the official BMC marinisation through later high volume professionals like Calcutt Boats & Thornycroft and then there were loads of boatyards & hire fleets doing their own marinisations using a variety of parts to "Freds in sheds" using goodness knows what. To add to the mix they started life with dynamos and only switched to alternators in the 1970s. What this boils down to is that noone can possibly know exactly what an individual boater has and this is made worse by the many alternators that have been fitted over the years. There is a question about the diameter of the crankshaft and alternator pulley and it is not rare to come across boats with the alternator pulley having the wrong width belt groove when compared with the crankshaft pulley. The 1.8 being a later engine is less likely to have been messed about with and if it was marinised by the likes of Calcutt Boats the belt is far more likely to be a standard size. Try confirming it is a 1.8 (1.5s have the injector pump sticking out of the side of the engine while the 1.8 ha sit lying along the side). Then try to identify the mariniser. Thornycroft and AMC are the same company now. Then contact them to see if they can identify your belt. Many motor factors will "pattern up" from your old belt and finally you may be able o read the size from the numbers on the outside of the belt, again a motor factors should know what they mean. Finally, as a new user, may I ask you to always send as much information as you are able. In this case I hope you just want to buy a spare but your question could also arise from a problem like belt shredding and if so that would require a totally different answer. Tony Brooks

Joeblow
Joeblow

Posted: Sun Jun 24, 2012 9:07am

Post Subject: BMC 1.8 Alternator belt

Tony, Thanks for the quick reply.I'll follow up on your suggestions. Joe.

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