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#4676853 - 02/24/18 06:55 PM Question on Hydraulic Timing Chain Tensioners
LoneRanger Offline


Registered: 07/02/07
Posts: 4050
Loc: Midwest USA
Occasionally get a rattle upon start up that clears in a couple seconds. The Guzzi has a Morse timing chain with hydraulic tensioners. Could it be a tensioner bled down that's the source of this momentary rattle?
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#4676859 - 02/24/18 06:59 PM Re: Question on Hydraulic Timing Chain Tensioners [Re: LoneRanger]
Vern_in_IL Offline


Registered: 06/25/14
Posts: 1883
Loc: IL
could be a bad ADBV in the oil filter.
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#4676860 - 02/24/18 07:01 PM Re: Question on Hydraulic Timing Chain Tensioners [Re: LoneRanger]
ram_man Offline


Registered: 03/15/13
Posts: 3204
Loc: southern mo
What kind of oil filter could be a tensioner but don't overlook the filter.
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#4676864 - 02/24/18 07:07 PM Re: Question on Hydraulic Timing Chain Tensioners [Re: LoneRanger]
oldhp Offline


Registered: 06/28/12
Posts: 1621
Loc: USA
I always thought the tensioner had some kind of a mechanical device to hold the slack when engine was shut off. No?
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#4676910 - 02/24/18 07:52 PM Re: Question on Hydraulic Timing Chain Tensioners [Re: LoneRanger]
Kestas Offline



Registered: 06/04/02
Posts: 12324
Loc: The Motor City
I know my Mercedes has a ratcheting mechanism to take up any slack.

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#4677023 - 02/24/18 09:33 PM Re: Question on Hydraulic Timing Chain Tensioners [Re: Kestas]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
Originally Posted By: Kestas
I know my Mercedes has a ratcheting mechanism to take up any slack.


So do all the Ford 4.6 and 5.4 engines.

Many engines do.
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#4677165 - 02/25/18 12:53 AM Re: Question on Hydraulic Timing Chain Tensioners [Re: LoneRanger]
02SE Offline


Registered: 12/30/05
Posts: 2723
Loc: The Canyons
Your bike is pretty new, and the most wear to the sprockets and timing chain occur in the first few thousand miles. The plunger has teeth along it's length (the ratchet mechanism mentioned) and as the initial wear to the chain and sprockets occurs, at some point the tensioner will be between being loose on one tooth, but not yet able to click to the next tooth. So there is that slack in the chain when the engine is first started, but before the oil pressure can press the tensioner against the camchain guide, and take up the slack.

Long story short: Eventually the chain and sprockets will wear just enough for the tensioner to click to the next tooth, and the momentary rattle before oil pressure builds, will cease. At that point the chain and sprockets will wear at a very slow rate from then on.

Sometimes the tensioners can go bad, but that's rare. So I wouldn't worry about it.

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#4678316 - 02/26/18 12:31 AM Re: Question on Hydraulic Timing Chain Tensioners [Re: 02SE]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17764
Loc: PNW
+1 on 02SE's comments. My Busa went through the same thing with the updated ratcheting/oil pressure feed CCT.

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#4678418 - 02/26/18 06:45 AM Re: Question on Hydraulic Timing Chain Tensioners [Re: LoneRanger]
LoneRanger Offline


Registered: 07/02/07
Posts: 4050
Loc: Midwest USA
Thanks for the info, that makes sense.
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