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Author Topic: Knocking from primary  (Read 283 times)

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1roadking

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Knocking from primary
« on: September 11, 2018, 09:54:33 PM »

Ever since I installed my 117 kit my primary has had a loud knock at idle. It  runs great with no other ill effects, but it sounds awful at idle! I don’t recall it making this  noise  when it was a stock 110.
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vtwinjim

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Re: Knocking from primary
« Reply #1 on: September 11, 2018, 11:14:46 PM »

Twin Cams had issues with getting enough load from the compensator nut.
It would bottom out before loading the compensator. Had it happen to mine after a repair.
Dull knock at idle coming from front of primary case is typical symptom.
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Mr. Warlock

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Re: Knocking from primary
« Reply #2 on: September 12, 2018, 06:00:00 AM »

Twin Cams had issues with getting enough load from the compensator nut.
It would bottom out before loading the compensator. Had it happen to mine after a repair.
Dull knock at idle coming from front of primary case is typical symptom.

In attempt to help the OP, what was done to fix this?
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grc

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Re: Knocking from primary
« Reply #3 on: September 12, 2018, 08:05:08 AM »


The thread locking compound Harley uses must be completely cleaned from the internal threads as well as the bolt threads before installing the compensator bolt with fresh thread locking compound.  Otherwise you will reach the specified torque on the bolt before you achieve the correct clamping load, due to the old hardened thread locker.

Jerry
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Jerry - 2005 Cherry SEEG  -  Member # 1155

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1roadking

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Re: Knocking from primary
« Reply #4 on: September 12, 2018, 08:56:55 PM »

My comp wasn’t taken apart during the motor work. R and R cycle did mention on washer/spacer but when I brought it in to them their tech must have been in a rush and never did it. Have people had success with this?
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grc

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Re: Knocking from primary
« Reply #5 on: September 13, 2018, 08:35:48 AM »

My comp wasn’t taken apart during the motor work. R and R cycle did mention on washer/spacer but when I brought it in to them their tech must have been in a rush and never did it. Have people had success with this?

He may have been referring to the flat needle bearing "washer" Harley uses on the latest compensator version instead of the old simple thrust washer.  The new part tends to be noisier than the old simple washer, and many folks have changed back to the older part.  However, if your bike didn't have this knocking problem before the work was done, and if they didn't take the compensator bolt out, I don't see how the thrust washer could be your problem.  You need to verify if they changed the washer or not, if they did then in fact they had to remove the crank bolt and it's possible they didn't remove all the old thread locker as mentioned previously.

Another issue I've seen mentioned after having engine work done is the tune.  If the idle is too low and/or rough, it can cause a knocking type of noise in the primary or trans at idle.

Jerry
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Jerry - 2005 Cherry SEEG  -  Member # 1155

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