Rattle from bottom end - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 17 (permalink) Old 03-08-2014, 12:03 PM Thread Starter
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Question Rattle from bottom end

During the winter, I occasionally take the bike out of the garage and run the engine for 20 minutes. When the engine is stone cold and idling, I can hear what sounds like a chain rattling against the crank case. It goes quiet for 5 or 10 seconds, then comes back again for a second or two. When the engine is hot the rattling stops on idle, but kicks in again when I blip the throttle. Does this sound familiar to anybody? If so, what do you recommend?

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post #2 of 17 (permalink) Old 03-08-2014, 12:36 PM
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sounds like the ACCT (auto cam tensioners) are marginal.

consider a conversion to manual ones (search here in forums for methods), or get TOC manual tensions (more $, but less work)
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post #3 of 17 (permalink) Old 03-08-2014, 01:30 PM
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if the bike has a heavy vibration as well then it could be the balance dampers if that is the case then you are in for an engine pull to replace them they aren't that expensive but the labor is time consuming

if the rattle is from the right side low it could be the clutch basket or the water pump

if its the clutch the labor isnt that bad if its the water pump then you have to pull the engine and split the case

get a stethoscope or a long screw driver and try to pin point the location of the rattle and when you do report back to us with the findings so we can better diagnose the situation

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post #4 of 17 (permalink) Old 03-08-2014, 01:56 PM Thread Starter
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Thanks. I'll try to pinpoint it like you said. There's no heavy vibration, so I think I can rule out the dampers. I'll get back to you.

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post #5 of 17 (permalink) Old 03-08-2014, 03:22 PM
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Likely ACCT. Try the Grambo trick when cold. Or just replace them- they are a crap design and should be replaced anyway.

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post #6 of 17 (permalink) Old 03-08-2014, 03:52 PM
..have a vulcan good day!
 
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Quote:
Originally Posted by Kelly2001 View Post
Likely ACCT. Try the Grambo trick when cold. Or just replace them- they are a crap design and should be replaced anyway.

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x3


If noise goes away with the Grambo trick.....mcct's are definitely the wtg !


'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
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post #7 of 17 (permalink) Old 03-13-2014, 01:28 PM Thread Starter
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Thumbs up Grambo fixed it!

I did the Grambo trick, and hey presto. No chain rattle. I got an unexpected bonus. This bike has never been a good starter, hot or cold. Now I just have to touch the button and the engine is running. Big thank you again to the VN 750 Forum. I don't know what I'd do without it!

Just because you're paranoid, it doesn't mean that they are NOT all out to get you.
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post #8 of 17 (permalink) Old 03-13-2014, 03:03 PM
..have a vulcan good day!
 
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Quote:
Originally Posted by Limeybiker View Post
I did the Grambo trick, and hey presto. No chain rattle. I got an unexpected bonus. This bike has never been a good starter, hot or cold. Now I just have to touch the button and the engine is running. Big thank you again to the VN 750 Forum. I don't know what I'd do without it!
That's great news !
.....now install mcct's ASAP.



This is my Copy & Paste collection ..............
hth.....


ACCT to MCCT conversion video
https://www.vn750.com/forum/showthread.php?t=18235

ACCT to MCCT Conversion Thread created by wib714
https://www.vn750.com/forum/showthread.php?t=17917

There are a couple of threads on here on how to convert a ACCT to a MCCT. I know one members said he'd get a video put up here, but I went ahead and did a video of the MCCT I created. (This is not my video).

Supplies needed: (for each mcct)
1. 1 each -6mm x 40 bolt
2. 2 each -6mm nuts
3. 1 each -6mm Locking Washer
4. 1 each - #12 x 5/8 bonded washer

Parts not needed:
1. Sleeve
2. Spring
3. Flat Washer

I did this on my bike yesterday to the rear cylinder and front cylinder, and they both quit knocking after the conversion. I took the front one off to do this video. I love that we are able to do this conversion.

http://www.youtube.com/watch?v=gY4IEHVqtoY

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!

Last edited by WilliamTech; 03-13-2014 at 04:08 PM.
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post #9 of 17 (permalink) Old 03-13-2014, 03:41 PM
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Will - I got the acct rebuild from toc. Why would you recommend your method over that? What are the benefits and drawbacks?

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post #10 of 17 (permalink) Old 03-13-2014, 03:48 PM
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By the way, I have no doubts about the functionality of your conversion, I just don't want to convert immediately after I replaced my automatic Springs

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