Help Me Understand The Basics Of Boat Battery Charging
- Thread starter GeneraiT001
- Start date
STOP READING MY MIND ! ! ! It's freaking me out man
.Our resident Guru is absolutely correct about my electrical system within 2-3 decimal points and knows more about my system than I do.
One other thing which may rear its $$$$ head is a mechanical supply of cooling air if your engine room is anything like mine. The engine enclosure started life as a Nike shoe box :
The engine has about 1" clearance under the cover which makes for a hot supply of cooling air for the alternator.
Enter the cooling fan which will keep the temperature of the cooling air below the temperature of the block ~ 170° F.
The reduced temperature cooling air keeps up the amperage output from the alt. as the external alt. regulator has a safety feature which reduces the amperage output as the body temp. of the alt. increases.
That is the one with a single foot (SF) and a dual V belt pulley (DV). That's not what you want. Yanmar engines have the dual foot configuration. You should see it clearly when you examine your existing alternator. The XT-DF-170-J10 has the footprint you need and the J10 pulley is a better selection. I think if you want the XT model, you will be committed to converting your entire pulley system. With that size, a single v-belt will wear out belts quickly and leave a mess of belt dust inside your engine compartment. If you don't want to change your pulley system, then I think you need to consider the 6-Series alternators.Hi, Thanks
Thats what I was looking at - XT-SF-170-DV-KIT
My previous owner installed a 125 amp alternator and used the OEM v-belt pulley system. Belt dust created a huge mess. I bought the kit for installing the J10 pulleys and it wasn't a hard job doing the conversion but I did have to buy an expensive prop puller to get the main drive pulley off. So far, it's been a 1-time use out of that tool, but at least I have it for future use
. I'm glad I made the conversion because any future alternator purchase won't be limited to one with a v-belt. The serpentine belt is a big improvement. I agree that the belt buddy is also a good improvement to get the proper belt tension. Everything we are talking about requires money spent in a cascading series of improvements. It's pretty much unavoidable. When you make a decision to use your boat in a certain way that leaves you more vulnerable to weaknesses that can lead to trouble, you have to be aware that there will be cost consequences. If you tether your boat to a dock, you can get by with far less ...When you read about the experiences of sailors who leave the dock behind, you will realize that refitting the boat is a significant project with significant costs.
BTW, when I converted to the J10 pulley https://www.westmarine.com/balmar-pulley-conversion-kit-18089193.html?utm_medium=cpc&utm_source=google&utm_campaign=GGL_PLA_Engine Systems_High Margin&gad_source=1&gad_campaignid=22691717993&gbraid=0AAAAAD_lEeqyuhuJEezfWQKn10TKkQXH8&gclid=Cj0KCQiAiebIBhDmARIsAE8PGNIG1jsG6NO8iaTOakhSo0x-M5QYtNi1CEyFjGj02uSW1qXuJk4aOwYaAtsvEALw_wcB I quickly realized that the outermost pulley rubbed on the inside of my engine box and quickly wore a groove in the fiberglass at the inner surface of the box. It made one helluva noise and filled the air with the smell of scorched fiberglass before I realized what the chaos was about. I made a 1.5" shim around the box to accommodate the new pulley dimensions. The adjustments never end!
The kit shown above says it is for Yanmar 4JH model. If you convert the pulleys, make sure you get the correct conversion kit.
The kit shown above says it is for Yanmar 4JH model. If you convert the pulleys, make sure you get the correct conversion kit.
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Thanks for the info on getting the right model of alternator. Hope getting the pulley off will ne a snap (LOL...fingers crossd)That is the one with a single foot (SF) and a dual V belt pulley (DV). That's not what you want. Yanmar engines have the dual foot configuration. You should see it clearly when you examine your existing alternator. The XT-DF-170-J10 has the footprint you need and the J10 pulley is a better selection. I think if you want the XT model, you will be committed to converting your entire pulley system. With that size, a single v-belt will wear out belts quickly and leave a mess of belt dust inside your engine compartment. If you don't want to change your pulley system, then I think you need to consider the 6-Series alternators.
My previous owner installed a 125 amp alternator and used the OEM v-belt pulley system. Belt dust created a huge mess. I bought the kit for installing the J10 pulleys and it wasn't a hard job doing the conversion but I did have to buy an expensive prop puller to get the main drive pulley off. So far, it's been a 1-time use out of that tool, but at least I have it for future use
When you read about the experiences of sailors who leave the dock behind, you will realize that refitting the boat is a significant project with significant costs.
jssailem
SBO Weather and Forecasting Forum Jim & John
- Oct 22, 2014
- 23,727
Listen to the comedian Jimmy Carr and you would never ask that question.
If you ask a Navy man, they would say, No problem. Just use a big hammer.
Yes, I used a battery powered impact driver to remove the pulley retaining nut when I rebuilt my alternator. Nut & pulley came off easily.
It was the gear case pully that was difficult to remove when I converted to the serpentine pulleys. If I remember correctly, the nut came off easily. The pulley had to be pressed off and that was a bit scary even with the prop puller.
The varies with the motor type. On my Yanmar 3JH2e the pulley slid over the old pulley and bolted to it. Same with the water pump pulley.