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Cam chain tensioner tool
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Noleshot Offline
Break-In Period

Posts: 9
Joined: May 2016
Post: #1
Cam chain tensioner tool

I have found an easy way to make a tool to lock the cam chain tensioner as prescribed in the shop manual before checking valve clearances. The actual Honda tool is ridiculously expensive (or so I was told by the local service department).

The space available to work in is very tight, so the tool must be compact. All you need is a cheap, 5mm Allen wrench, like the kind that comes with assemble-yourself furniture, toys, etc. You need a bench grinder or files and a small pair of needle-nosed vice grips.

Looking at the diagram of the actual Honda tool, there is what appears to be a straight, screwdriver-like tip that engages a slot down inside the tensioner body. Take the Allen wrench and grind down the end of the short leg into a tip as shown. The overall length of the short leg with the tip should be 1". (The angle of the tip in relation to the wrench shouldn't matter)

Cut off the long leg of the wrench so that the tool is 1 1/4" long. See photos. The tool is 1 1/4" by 1" overall.

Remove the bolt and washer from the tensioner. You will need a long 8mm box-end wrench. There is an "X" shaped slot with a threaded bore in the center where the bolt screws in. Insert the slotted end of your new tool into the tensioner and rotate it slowly until you feel it engage the slot within. You can now turn the tool clockwise (tightening motion) and feel the small spring in the tensioner compress. It is approximately 1 full turn.

When it is compressed completely, carefully lock the vice grips onto the long leg of the tool, making sure the tool doesn't disengage. It may take a couple of tries. You should be able to find a position where the vice grips hold the tool securely as in the photo. If not, re-engage the tool 180 deg. from the 1st attempt.

For the record, I checked valve clearances at 7500 miles. All were at the middle of the clearance range, with one intake valve being slightly larger than the others, but still in spec. I was amazed and figure the factory was very careful adjusting the clearance initially. Obviously, 7500 miles of moderate usage had no effect on the clearances. To me, this testifies to the high build quality of the engine.
07-16-2017 04:26 AM
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popgun Online
Lives On Two Wheels

Virginia Beach
Posts: 5,933
Joined: Apr 2013
Post: #2
RE: Cam chain tensioner tool
Pics didn't show Noleshot.

The part is called a Tensioner Stopper(in the service manual) and the US part number 07 AMG-001A100 is $105.23 at Partszilla. Also called a Holder tensioner. Seems like a lot of money for what is is.

For those interested, the non US part number is 070MG-0010100

If you come to a fork in the road, take it!
2013 CB1100
2012 ST1300
(This post was last modified: 07-16-2017 04:44 AM by popgun.)
07-16-2017 04:44 AM
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