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[Solved] Broken belt crushed supercharger nylon idler pulley

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[Solved] Broken belt crushed supercharger nylon idler pulley #1 Solved
Zymurgy Mike Madden London, OH, USA Sign in to contact 1966 Chrysler 300 "Goldie" 1973 MG MGB "Melvin"	Topic Creator (OP) Apr 21, 2024 01:26 PM Joined 14 years ago 824 Posts

Solved

I had a spare belt and realized I should have just changed it, since it was 14 years since I installed the supercharger. That being said I didn't expect a section on the belt to fail, wrap around the idler pulley and crush it.

Anyone else experience this? Is there a metal pulley replacement? There is a Moss part number in the installation instructions but nothing comes up on their site.

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Re: Broken belt crushed supercharger nylon idler pulley #2
bleteaches6 Lee Orphan Bonney Lake, WA, USA Sign in to contact 1956 MG MGA 1500 1974 MG MGB GT 1974 MG MGB GT 1979 MG MGB Limited Edition (LE) & more	Apr 21, 2024 01:28 PM Top Contributor Joined 16 years ago 11,982 Posts

I would call Moss and I suspect they will take care of you

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Re: Broken belt crushed supercharger nylon idler pulley #3
RAY 67 TOURER Ray Marloff Fort Bragg, CA, USA Sign in to contact 1967 MG MGB "My Girl"	Apr 21, 2024 01:40 PM Top Contributor Joined 14 years ago 17,493 Posts

Jackson Racing put together the supercharger kit for Moss. I've had a few issues with my supercharger kit in the 20 years since I installed it, but nothing like you have experienced. However, Moss should be able to assist you in locating a replacement idler pulley. RAY

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Re: Broken belt crushed supercharger nylon idler pulley #4
Zymurgy Mike Madden London, OH, USA Sign in to contact 1966 Chrysler 300 "Goldie" 1973 MG MGB "Melvin"	Topic Creator (OP) Apr 21, 2024 03:42 PM Joined 14 years ago 824 Posts

After doing some research it looks like Moss made a supercharger for JRSC used on Hondas and Miatas. It has the same part number and it appears to be a $60 part. I found a company 1320 Performance that makes a idler pulley out of stainless for a JRSC supercharger with the same specs as mine. I need to verify the 3/8th bore, but it is also $60 and free shipping. This seems like a no brainer if the bore is the same.

https://1320performance.com/products/1320-performance-jrsc-pulley-supercharger-bracket

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Re: Broken belt crushed supercharger nylon idler pulley #5
Zymurgy Mike Madden London, OH, USA Sign in to contact 1966 Chrysler 300 "Goldie" 1973 MG MGB "Melvin"	Topic Creator (OP) Apr 27, 2024 01:55 PM Joined 14 years ago 824 Posts

I could not me happier Excellent quality solid stainless steel idler pully exact same specs as the nylon pulley. Side by side and you can see the damage the belt did to the nylon pulley.

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Re: Broken belt crushed supercharger nylon idler pulley #6
Steve S Abingdon, So Cal, USA Sign in to contact 1925 Ford Model T 1937 MG SA Saloon 1939 Ford V8 1946 Other Not Listed & more	Apr 27, 2024 07:24 PM Top Contributor Joined 19 years ago 22,401 Posts

That isn't normal. I have around 70K miles on one of my blowers and the pulleys were fine. I actually wore out the bearings in them, but the pulleys could still be used.

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