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Forum: Engines and Propulsion Systems 16-03-2017, 23:44
Replies: 42
Views: 8,447
Posted By jacktheflyer
Re: Alternator Belt issue 3YM30

Do you still have the kit you removed?
Forum: Engines and Propulsion Systems 06-07-2016, 11:51
Replies: 42
Views: 8,447
Posted By jacktheflyer
Re: Alternator Belt issue 3YM30

Have to ask, where does the belt dust go? I can tell you where a lot of mine went, into the engine is where. The factory Yanmar "air filter" isn't much for filtering, assumption is I'm sure that...
Forum: Engines and Propulsion Systems 06-07-2016, 04:18
Replies: 42
Views: 8,447
Posted By jacktheflyer
Re: Alternator Belt issue 3YM30

I don't remember what sectional size they are but to my knowledge all small belts are 40 deg angle and they do fit the pulleys being slightly proud when new

Scrubby
Forum: Engines and Propulsion Systems 06-07-2016, 04:11
Replies: 42
Views: 8,447
Posted By jacktheflyer
Re: Alternator Belt issue 3YM30

From quick start:
Alternator pulley belt wrap, what does that mean? Belt wrap is the contact area the belt has with the pulley. but the greater the belt wrap the longer belt and pulley life can be...
Forum: Engines and Propulsion Systems 06-07-2016, 04:05
Replies: 42
Views: 8,447
Posted By jacktheflyer
Re: Alternator Belt issue 3YM30

Tks DeepFrz

Pulley alignment is good.

Scrubby
Forum: Engines and Propulsion Systems 06-07-2016, 04:02
Replies: 42
Views: 8,447
Posted By jacktheflyer
Re: Alternator Belt issue 3YM30

Twin boat
I make them as tight as I can and retighten after the first run on new belts. I would say that I am overtightening the belts which potentially will cause premature failure in the...
Forum: Engines and Propulsion Systems 06-07-2016, 04:01
Replies: 42
Views: 8,447
Posted By jacktheflyer
Re: Alternator Belt issue 3YM30

Twin boat
I make them as tight as I can and retighten after the first run on new belts. I would say that I am overtightening the belts which potentially will cause premature failure in the...
Forum: Engines and Propulsion Systems 06-07-2016, 03:58
Replies: 42
Views: 8,447
Posted By jacktheflyer
Re: Alternator Belt issue 3YM30

Bob
The serpentine belt looks (to me) to be the best option but is also the most expensive.
Scrubby
Forum: Engines and Propulsion Systems 04-07-2016, 14:42
Replies: 42
Views: 8,447
Posted By jacktheflyer
Re: Alternator Belt issue 3YM30

Alternattors are 80amp but rarely run more than 40 for any length of time. Belts need adjusting reguarly and replacement every 50 to 100hrs



Sent from my SM-T355Y using Cruisers Sailing Forum...
Forum: Engines and Propulsion Systems 04-07-2016, 03:44
Replies: 42
Views: 8,447
Posted By jacktheflyer
Alternator Belt issue 3YM30

I have a constant issue wearing out alternator belts on both Yanmar 3YM30 on my Fusion 40 Sailing Cat. this is due to the high charging current required for the house batteries. I see an answer is...
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