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#964200 - 06/23/16 03:34 AM Re: 1100 RT transmission noise when under slight load [Re: dirtrider]  
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SmokinRZ Offline
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Good call Snookers on the driveshaft. I will try that this weekend to see if there is excessive lash, I have access to the 98 to compare it to. It would be an easy fix. However, I believe the PO stated that the noise started after the transmission change but I might try to contact him to confirm. I thought about the U joint earlier but I wouldn't think a U joint would last 20K miles. I'm not sure how much credibility to give a guy that was trying to sell a motorcycle with a noisy transmission

Dirtrider, the noise occurs only when there is no load on the transmission. I know my heading says "slight load" but now that I think about it, It occurs in that slight window between on and off throttle. I believe it does it in every gear but most noticeable the higher the gears (4th and 5th). If I was just on or off the throttle I would never notice it, but my OCD knows it's there smile

#964283 - 06/24/16 10:40 AM Re: 1100 RT transmission noise when under slight load [Re: SmokinRZ]  
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Lowndes Offline
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Hey, SmokinRZ, CONGRATS on the RT!!

You will quickly learn that Mr. DirtRider is one of the most prolific, knowledgeable, and helpful members on here.

One tiny suggestion to add to this: you might try a stethoscope (or a wood dowel, long screwdriver, even a broomstick, etc.) to listen to most anything mechanical to isolate a noise. I've use all the above to find which lifter on a car is clicking, which end of an alternator has the bad bearing, bad water pumps, bad idler pulley bearings, etc. Unaided listening can be very deceptive with all the other parts reflecting, amplifying and creating noises, but its amazing how well this works.

Press one end of the dowel/screwdriver handle firmly on the little flap of skin just in front of your ear canal and put the other end as close to the suspect bearing as you can get. Of course, it has to be running and making the noise while you do this.

What if you put the bike on the centerstand, running and in gear, then apply the rear brake to provide a "light load" and create this noise while you listen all around with a long dowel for the offending parts??

A 36" long x 1/2" or 3/8" dia wood dowel works well, just round off one end to make it comfortable for your ear. An 18" or 24" screwdriver with a rounded handle works really well. Only thing it doesn't work on is a spinning u-joint, but you can definitely tell which end of the drive shaft has the bad u-joint. Put it on your valve cover and listen to the lifters/rockers.

Good Luck!!


Old Fart Newbie
#964288 - 06/24/16 11:50 AM Re: 1100 RT transmission noise when under slight load [Re: SmokinRZ]  
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SmokinRZ Offline
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Thanks for the tip Lowndes, I have a stethoscope from when I was diagnosing a bad fuel injector on my truck. And nice looking S! Reminds me of my riding buddy's black S that I rode out west with a few times. Never seen a bike garner so much attention from the general public. Of course the two bros pipes needed repacking badly smile

#964482 - 06/26/16 05:08 PM Re: 1100 RT transmission noise when under slight load [Re: SmokinRZ]  
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Well I rode it again today and made a big discovery. The noise occurs when I pull in the clutch and increases rhythm with speed which explains why I could only detect it in 4th and 5th. I compared the backlash of the back wheel on the stand with the 98 and they there was no measurable difference. I believe my issue is with the driveshaft. I was under the impression that these failed suddenly. I'm hopping it is the driveshaft - time to order a 30MM hex socket and tear into it.

#964486 - 06/26/16 06:18 PM Re: 1100 RT transmission noise when under slight load [Re: SmokinRZ]  
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Boffin Offline
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Originally Posted By: SmokinRZ
Well I rode it again today and made a big discovery. The noise occurs when I pull in the clutch and increases rhythm with speed which explains why I could only detect it in 4th and 5th. I compared the backlash of the back wheel on the stand with the 98 and they there was no measurable difference. I believe my issue is with the driveshaft. I was under the impression that these failed suddenly. I'm hopping it is the driveshaft - time to order a 30MM hex socket and tear into it.


What brand of tyres do have fitted?
I once had the final drive stripped and checked (under warranty) by a dealer who found nothing wrong, but there was a road-speed related vibration and noise. Turned out to be a worn, slightly cupped, rear tyre...

Andy


Andy Long

2004 R1150RT : traded for:
2002 R850R SE
1986 K100RT : sold
2013 Kawasaki W800 : sold
2015 Royal Enfield Bullet 500 EFI

"No man ever got very high by pulling other people down. The intelligent merchant does not knock his competitors. The sensible worker does not knock those who work with him. Don't knock your friends. Don't knock your enemies. Don't knock yourself." Alfred Lord Tennyson
#964545 - 06/27/16 11:40 AM Re: 1100 RT transmission noise when under slight load [Re: Boffin]  
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SmokinRZ Offline
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Metzler Tourance - it is a metallic thrashing sound.

#964581 - 06/27/16 06:21 PM Re: 1100 RT transmission noise when under slight load [Re: SmokinRZ]  
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Originally Posted By: SmokinRZ
Metzler Tourance - it is a metallic thrashing sound.


Check for cupping - mine sounded like a shot bearing

Andy


Andy Long

2004 R1150RT : traded for:
2002 R850R SE
1986 K100RT : sold
2013 Kawasaki W800 : sold
2015 Royal Enfield Bullet 500 EFI

"No man ever got very high by pulling other people down. The intelligent merchant does not knock his competitors. The sensible worker does not knock those who work with him. Don't knock your friends. Don't knock your enemies. Don't knock yourself." Alfred Lord Tennyson
#979666 - 02/05/17 08:35 PM Re: 1100 RT transmission noise when under slight load [Re: SmokinRZ]  
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SmokinRZ Offline
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Ok, I have my transmission out to tackle this light load transmission rattle. The input shaft is smooth as silk, so is the tail shaft. The PO said it made this noise after he replaced the transmission 20K miles ago and not to worry. I have a low mileage transmission located from a owner with a front end collision RT, so that was my plan but now I'm confused that the input shaft is so smooth. Rattle come on between on and off throttle and most noticeable in the upper gears, like a rod knock except it goes away with the clutch in. Going back out to take off the throwout bearing. Drive shaft U joint also smooth as can be. PO put in Seibenrock clutch and Sachs pressure plates from Beemer Boneyard.

I'm sure it is the transmission, maybe intermediate shaft.

Last edited by SmokinRZ; 02/05/17 08:38 PM.
#979668 - 02/05/17 09:39 PM Re: 1100 RT transmission noise when under slight load [Re: SmokinRZ]  
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dirtrider Offline
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Afternoon SmokinRZ

Now that you have it out & apart you are committed, so you either need to identify SOMETHING major or you will have that trans out again in the future.

Your smooth running shafts don't surprise me as your rattle didn't sound bearing related but more gear slop related, or shaft end play related, or clutch pack related, or possible drive shaft related.

So how is the end play on all 3 trans shafts???

Also don't rule out that non-OEM clutch disk or plate as being part of or all of the rattle.

How do the trans input splines look?

How much radial play in the clutch disk to the trans input shaft splines?

If it were me & I removed the trans before fully identifying the noise source I would have the entire clutch out & be measuring comparing all the parts, be looking at the tightness of the clutch spring, be checking the trans shaft end play, be checking the engine rear main bearing for excess movement, be looking at the clutch release bearing (closely), be looking for a bent clutch push rod, be looking at ANYTHING that could rattle under engine firing pulses.

Look closely at the clutch pack parts for signs of rubbing/contacting producing that rattle.

Something is moving or rotating producing that rattle so start with the engine rear main bearing & work your way to the rear measuring & meshing EVERY part until you find the area or parts that are out of spec producing that rattle.


D.R. ___
Sent from my rotory dial wall phone!
#979683 - 02/06/17 01:48 AM Re: 1100 RT transmission noise when under slight load [Re: SmokinRZ]  
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SmokinRZ Offline
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The end play on the output shaft is nil, the input shaft makes a little thud if pull hard but I don't think it is excessive.

The splines look great and the clutch hub looks great. I pulled and tugged on the clutch pack and rotated the motor with it by hand. No leaks I can see on the main seal.

The drive shaft is nice and smooth. Didn't make noise in neutral coasting. Only when in gear during the transition between load (accelerating) and reverse load (engine braking). In all gears but more noticeable in the higher gears.

Push rod is fine but I didn't get a chance to look at the release bearing.

I pulled the trigger on the used transmission. I just put a OEM clutch in my 98 GS, so I started this project while all the tools were out and the process fresh in my mind. Worse case I'm back in there again. At least everything will be clean which eats up most of my time working on things.

Thanks for your time DR, I visit the oil head section every day since getting my first BMW 18 months ago. Been wrenching and riding Japanese bikes for over 40 years, but the BMW is a different experience.

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