Cam chain tensioners.

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Ted Devey
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Joined: Mon Mar 23, 2020 11:39 pm
Country of Residence: Portugal

Cam chain tensioners.

Postby Ted Devey » Tue Mar 24, 2020 12:35 am

Boxer, oilhead, Cam chain tensioners. R850R Comfort 2004. Frame numberWB10428 A64zF07533
1, How do I tell if this bike has the old standard or the newer cam chain tensioners
-----The current ones have a 17mm nut head. Possibly the older ones??
2. I see a number of youtube sites changing them with the before and after result of no cam chain 'lash' , generally quieter and smoother.
One says " You only need to change the left one??? ( Can't get an answer from the poster of that clip[) -- But, why would that be? Logic suggests to me that you should o both ???
3. Are the new ones simply with a stronger spring for more load? I thought the tensioners were held in by oil pressure, hence the small holes in the body to let oil in to pressure the piston. Is this the case? And if so why would a slightly stronget spring make a difference when the engines running?

Any positive comments are welcome.
Cheers. Ted

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Douglas C
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Joined: Fri Jul 29, 2005 8:53 pm
Location: South Queensferry

Re: Cam chain tensioners.

Postby Douglas C » Tue Mar 24, 2020 9:32 am

1. 15 mm head size new type,17mm head size old type.
2. Just the left hand side. Possibly because the RH one is at the bottom of the cylinder and stays full of oil?
3. No idea, sorry!
Douglas C.

2000 R1150GS
1998 K1200RS (Now gone)
1994 K1100RS (Now gone)
1968 Triumph T120

Ed 56
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Re: Cam chain tensioners.

Postby Ed 56 » Sat Apr 04, 2020 8:10 pm


King Herald
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Country of Residence: United kingdom
Location: Midlands.

Re: Cam chain tensioners.

Postby King Herald » Sun Apr 05, 2020 9:05 am

Apparently the old ones would let the oil drain out if left standing, causing a clatter when fired up, but the new one doesn’t.

Not 100% sure but it cured the rattling at startup in my ‘97 1100r.
1997 BMW R1100R
1993 Honda Transalp 600


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