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Onan MCCK 6500 belt pulleys and belt size?


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Old 05-26-2013, 07:57:39 AM
sdowney717 sdowney717 is offline
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Default Onan MCCK 6500 belt pulleys and belt size?

My MCCK 6500 is the type with fresh water cooling.

Drive belt is 3V400 belt width 3V, length 40 inches.
Many automotive belts are 4V, 3V will look thin on the top side.

So there are 2 pumps, raw and fresh water.
These 2 belt pulleys are made of thin steel and frankly are crap. The edges spread apart causing the belt to slip. I hammered them together and carefully aligned to fit the 3V400 belt. But I dont like these pulleys. They will bend back I think, and cause I cant make them perfectly true will likely wear out the belt.

Pulleys are 1/2 ID and 3 1/2 outside. The machine groove in the flywheel is narrow so the belts appear to be 3V type thin belts.
Pulleys should match the belt that drives them.
A 4V type belt wont fit the flywheel groove so it is how Onan made it.


Can you buy narrow belt pulleys?
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Old 05-26-2013, 08:18:04 AM
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Billy J Shafer Billy J Shafer is offline
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Default Re: MCCK 6500 belt pulleys and belt size?

I believe those pulleys came with the pumps. Should be Jabsco pumps. You might try contacting them. But any good pulley that fits the shaft should work.
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Old 05-28-2013, 10:21:11 AM
lijobi lijobi is offline
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Default Re: MCCK 6500 belt pulleys and belt size?

Go to e-bay and look for a seller named Redsheller, he sells pulleys of all sizes and will have what you need. I have his cast iron pulleys on 2 of my Onan/Oberndorfer water pumps and they are high quality and fit perfectly. It will not be a problem to fit one on the smaller shaft of the raw water pump either. I've found the stock pulleys to be crap as well and for about 25 or 30 bucks your problem will be solved.
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Old 06-02-2013, 09:51:57 AM
sdowney717 sdowney717 is offline
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Default Re: Onan MCCK 6500 belt pulleys and belt size?

hey thanks.
I cleaned up and straightened the pulleys some more.
I then painted with green rustoleum spray paint. They still are lousy pulleys.
They do run straight now. If they dont grab the belt unevenly maybe the belt will last.

Autozone sells Dayton belt for $8.99 with no ship. Everyone else wants $25.

I found painting pulleys works well on the main engines. The paint actually stays on the lower pits so water cant sit in those tiny pits and helps with keeping down rust issues.

A belt has to fit the pulley. Belts are supposed to wedge and ride on the sides of a pulley. So narrow 3/8 belt on a wide pulley will run on the bottom more than it should and then it slips.

I think if a pulley says 3L or 4L then it will fit a 3/8 to 1/2 inch width belt.

However would a 3L pulley fit a slightly deeper 3V belt properly without bottoming? If the pulley is already biased towards 4L wider belts, I wonder if a 3V narrower belt would drop the belt to the bottom of the pulley.

You can buy 3L400 belts which would not be as tall in profile.
Does anyone really know what size belt the MCCK is designed to use, 3L or 3V?

http://www.vbelts4less.com/V-Belt-Specs_ep_45.html

Difference between v type belts.
Some belts are L type
L type are not as tall (b dimension)
L type are not as wedgy as V type.

Some belts are V type
V type are taller than L type
V belt are considered Wedge V Belts
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