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twin cam motors

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Old Nov 10, 2010 | 11:27 AM
  #11  
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Originally Posted by daves1450
hi ive been told about cam failures , from one mechanic before they fail and destroy the engine they recomend changing the cam chains the gear driven cams, they can fail any time between 10 and 25 thousand miles, is he just after the work cheers, Dave
On TC88s the rear cam is chain driven from the crankshaft and the front cam by another chain off the rear cam. Both chains have spring-loaded tensioners, and these can wear through. TC96s have an improved system using hydraulic tensioners which can be retrofitted. They are not affected. It is a widely known problem and many bikes will by now have been rectified.

An alternative solution is to replace the chain set-up with a geared one, but this is more expensive and requires checking run-out of the crankshaft before installing. I have had my Dyna from new and haven't had the chains upgraded yet, but that bike doesn't do many miles.

If you are looking at TC88s check mileage and service record. Low mileages are likely to need the upgrade in the fullness of time, higher ones may have been upgraded.

Hope that helps!
 
Old Nov 11, 2010 | 11:12 AM
  #12  
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my 06 TC88 roadking had 67k miles on it before I changed cams and then the only reason was because i had a leaking cam cover gasket so figured since they were in there, go ahead and do it. on the 06 i went with gear drive as it was what was recommended but on my 09 TC96, i replaced the stock cams a couple of nights ago with andrews 48h chain drive cams because those tensioners are not subject to the issues of the 06 model
 
Old Nov 11, 2010 | 05:06 PM
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UltraNutZ, thats about the best mileage I've heard of for those tensioners! Goes to show just how unpredictable they are, as I have seen another post with photos showing them worn through to the metal in much less than 20k miles.

This thread shows what they can look like when they are shot.
 
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