Aftermarket cooling fan - Page 4 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Engine / Exhaust / Cooling
\ From the radiator, through the case and out
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post #31 of 36 (permalink) Old 01-20-2008, 12:53 PM
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My first guess would be that the fan is not balanced properly.
OR
The drive motor/mount is somehow bent, causing undue vibration.
Seems like the support shoud be rubber mounted, but not sure as never took this apart..
If the same part breaks twice in the same place...there must be some force acting on it you can not see...

KM

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post #32 of 36 (permalink) Old 01-20-2008, 12:59 PM
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À où est-il cassé ?
Where is it broken at? Is it possible that the supports have been tighten down too much.

Une image vaut la peine mille mots.

Dianna
Conway, AR
Patriot Guard Rider
2000 VN750 Sere (Serendipity)
1990 GL1500 (Ole Blue)
1986 VN750 EVie (project bike, heavy custom)
VROC # 11628 / 25000-H
ARVROC # 12 Coordinator and Crowd Control
OKVROC # 18 (H)
TNVROC # 45 (H)
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post #33 of 36 (permalink) Old 01-20-2008, 01:01 PM
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Quote:
Originally Posted by Mark View Post
Well, I feel better knowing that Tirrell has noticed improvement with the Muzzy fanblade. I get stuck in bumper-to-bumper traffic every day to and from work so I can use all the cooling help I can get.

Thanks! Mark
BTW, I also have the muzzy fan installed and run engine ice as a coolant. I am very happy with my summer running temps now here in Arkansas.

Dianna
Conway, AR
Patriot Guard Rider
2000 VN750 Sere (Serendipity)
1990 GL1500 (Ole Blue)
1986 VN750 EVie (project bike, heavy custom)
VROC # 11628 / 25000-H
ARVROC # 12 Coordinator and Crowd Control
OKVROC # 18 (H)
TNVROC # 45 (H)
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post #34 of 36 (permalink) Old 01-20-2008, 06:15 PM
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Quote:
Originally Posted by Dianna View Post
Une image vaut la peine mille mots.
Oui , Une image would être une gros aider


AKA: Tim & 'The Adventure Cycle' VROC #24567, NEVROC, SteelCity VROC


"When life throws you curves,
Aim for the apex."

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post #35 of 36 (permalink) Old 01-23-2008, 05:56 AM
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Sorry, I have no pics...

The 2 supports broke at the same place (2 lower of the 3 legs of the support, just under the philips screws). The support is bolt to the radiator with 4 bolts. There are no dampers. The fan is fitted to the support with 3 philips screws. No dampers. The support is made of stampered iron sheet (very thin).
The supports seemed to be normal, not torn, and when I ran the fan mounted on the support on a table without noticing vibes.
In fact, the vibes from the engine are normally filtered by the dampers of the radiator. The radiator is bolted to the frame by 4 bolts with dampers.
I'm thinking that the dampers are worn, as they are a little loose...
Next saturday I'll try to replace them with new ones.
Thanks, I'll keep you informed...
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post #36 of 36 (permalink) Old 05-04-2020, 01:08 AM
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Are there any aftermarket fans? This is the second fan to break a motor bracket in less than 5000 miles, there will not be a third....

Looking at the 5.2" Spal fan

1989 VN750
Highway blaster

2006 Honda Rebel Diesel
100mpg, low and slow

1982 Mercedes 300D
Modified engine, 4-speed manual
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